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CDM230 Conductivity Meter

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1. Sample Result Error Temp Meas Time No C mm ss hh mm ss 7 81 9 cm 23 3 00 14 10 12 02 CDM230 Conductivity Meter 654R01N001 27 MAR 1998 08 42 CELL CALIBRATION Cell No 1 Cell Constant calibrated using 0 05 NaCl Conductance 39 2 mS Temperature 25 0 C Measurement Time 14 s Cell Constant value 1 2468 cm 1 A7 5 Salinity Salinity measurements on a seawater sample using the CDC565 conductivity cell Programmation Edit METHOD Method C Cell No 2 Mode Salinity Printout Format All Warning Beep Yes Result Beep Yes Edit CALIBRATION Cell 2 Constant Calibrate using Seawater Standard Stability Criterion 1 0 min Accept Time 60 s Calibrate every 7 days Cable resistance 0 000 Cable Capacitance 400 pF Edit SAMPLE Sample result Autoread Stability Criterion 1 0 min Accept Time 60 s A7 6 Results Cell calibration Sample measurements CDM230 Conductivity Meter 654R01N001 3 APR 1998 10 21 SAMPLE Method C Cell No 2 Mode Salinity Last Cell calibration 3APR98 09 09 Cell Constant value 1 2482 cm 1 Sample Result Error Temp Meas Time No C mm ss hh mm ss 12 35 07 21 0 00 14 10 22 55 CDM230 Conductivity Meter 6
2. CDM230 Conductivity Meter 654R01N001 4 DEC 1995 09 57 SAMPLE Method B Cell No 1 Mode Resistivity Sample result Autoread Stability Criterion 1 0 min Accept Time 60 s Pure Water Correction No CDM230 Conductivity Meter 654R01N001 4 DEC 1995 10 02 PRINTER Printer Output 9600 n 8 1 CDM230 Conductivity Meter 654R01N001 4 DEC 1995 09 59 TEMPERATURE CORRECTION Method B Cell No 1 Mode Resistivity Temperature Correction Enter below Reference Temperature 25 C Temperature Coefficient 2 20 C 9 9 GLP Data Cell calibration data 1 Press the GLP key 2 Select CELL with the left or right arrow keys 3 Press the Print key A table is printed out with the last 5 calibration results for the cell selected Example of printout obtained for a Conductivity method CDM230 Conductivity Meter 654R01N001 4 DEC 95 09 42 GLP CELL CALIBRATION Cell No 1 GLP Constant Calibration Value Temp Time Date Cable Cable No cm 1 mode measured C h min pF 1 1 1629 1 KCl 95 7mS 25 0 09 37 04DEC95 0 000 0 2 1 1631 1 KCl 95 5mS 25 0 10 02 31NOV95 0 000 0 3 1 1688 1 KCl 95 2mS 25 0 11 31 24NOV95 0 000 0
3. 2 6 Conductivity values of KCl Demal solutions A1 1 Resistivity values of KCl Demal solutions A1 3 Keyboard beep 7 23 L Language selection 2 2 Lock current calibration 5 4 6 4 7 10 7 13 Locking the CDM230 Edit mode 7 25 A8 3 M Manual measurements by pressing 7 20 Method Selecting a method 2 2 Editing a method 7 1 Method calibration Concentration method Definition 8 11 Editing a method calibration 6 4 7 13 Performing a method calibration 6 9 Method calibration TDS method Definition 8 8 8 9 Editing a method calibration 5 4 7 10 Performing a method calibration 5 8 Method table Printing a method table 9 7 N Natural water correction NWC Definition 8 6 How to progra
4. 7 7 7 11 7 15 7 17 AUTOREAD measurements 7 16 AT INTERVALS measurements 7 18 C Cable capacitance 7 9 Cable resistance 7 8 Calibrate every 7 8 7 12 7 15 Cell constant Definition 8 2 Determination cell calibration 2 4 Cell calibration Definition 8 2 Editing a cell calibration 7 6 Performing a cell calibration 2 4 Concentration Theory 8 11 Concentration method editing 6 2 Concentration method running 6 8 to 6 14 Concentration coefficients CC Definition 8 11 Determination of the CC 6 9 Conductance range Selecting a conductance range 3 1 Conductivity conductance Theory 8 2 Conductivity method editing 7 3 Conductivity method runnin
5. 7 10 Edit Calibration Concentration Method 7 13 Edit Sample AUTOREAD Measurements 7 16 Edit Sample AT INTERVALS Measurements 7 18 Edit Sample MANUAL Measurements 7 20 Edit Tref Temperature Correction 7 21 Edit GLP 7 23 Edit PRINT 7 24 Locking the Edit Mode 7 25 Theory 8 1 Conductivity and Resistivity Measurements 8 2 Salinity Measurements 8 7 TDS Measurements 8 9 Concentration Measurements 8 11 Printouts 9 1 Troubleshooting and Maintenance 10 1 Error Messages 10 1 Maintenance Changing the Bat
6. T Tref 1 3 3 100 100 T Tref 8 5 Determination of the Temperature Coefficient By measuring the conductivity of a typical sample at a temperature T1 close to Tref and another temperature T2 you can calculate the tempera ture coefficient by using the following equation T2 should be selected as a typical sample temperature and should differ by more than 10 C from T1 With temperature compensation the conductivity at the reference tem perature is displayed Note that the compensation is accurate only within a limited temperature range around T1 and T2 On the figure below T1 26 C T2 14 C and Tref 25 C 0 005 0 010 0 015 Conductivity S cm Temperature C 5 15 25 35 Real sample conductivity Unit C T1 T2 100 T2 T1 T1 T1 T1 T2 T2 8 6 The Natural Water Correction The natural water correction is selected in the Edit Tref mode with the Temp correction Natural water option see chapter 7 Principle The conductivity T measured at the sample temperature T is corrected to 25 C to give 25 using the following equation 25 f25 T T f25 T is the temperature correction factor used for the conversion of conductivity values of natural water from T to 25 C The CDM230 calculates f25 T from a 4 degree polynomial equation This equation fits the conductivity variations against temperature for natura
7. The CDM230 prompts you to perform a new method calibration if the current calibration is older than for example 7 days Range available 1 to 999 days After having entered this number of days press the up arrow key or leave the Edit Calibration mode by pressing the Method Sample Cal or Tref key CALIBRATE EVERY 7 DAY S ACCEPT TIME 60 s 7 16 Edit Sample Sample measurements can be performed in three ways depending on the option selected in the EDIT Sample mode Using the MANUAL function with a live reading on the display When you consider the measurement to be stable press the key Using the AUTOREAD function which locks the result on the display as soon as the signal is stable Stability is defined by the Stability criterion and Accept time set in the Edit Sample mode Using the AT INTERVALS function in which the sample is measured continuously and printed out at specific time intervals set in Edit Sample The measurements will stop at the end of Stop print after set in the Edit sample mode Edit Sample AUTOREAD Measurements In this mode the result is locked on the display as soon as the measure ments satisfy user defined criteria Using Select the method A B or C for which you want to edit the sample parameters Press the Sample key for 3 seconds to enter the Edit Sample mode Select AUTOREAD using METHOD A CELL1 CONDUCTIVITY SAMPLE RESULT AUTOREAD Sample 3 seconds 7
8. cm UNIT SELECTION S m S cm or SIGNAL gt 100 OF 4 000 S RANGE SIGNAL gt 100 OF 40 00 S RANGE SIGNAL gt 100 OF 400 0 S RANGE SIGNAL 26 6 OF 4 000mS RANGE SIGNAL 2 66 OF 40 00mS RANGE SIGNAL lt 1 OF 400 0mS RANGE SIGNAL lt 1 OF 2 000S RANGE RESET READING NO YES UNIT SELECTION mg l or Using If Fixed range has been chosen select the conductance range for measure ments The best resolution is obtained when the signal is 10 to 100 of the range If Fixed or Manual range has been selected only select Yes using if you want to display a relative conductivity measurement During the sample measurement you will be prompted to confirm the reset reading See also chapter 3 paragraph Relative conductivity measurements Using Select the measurement unit Conductivity can be measured in either S m or S cm and resistivity in cm or m Concentration can be measured in mg L g L g kg mg kg g kg ppm ppb mol L mmol L mol L mol kg mmol kg mol kg or g L Important to obtain the best reading resolution select a concentration unit in order to have at least 1 000 displayed for all standard concen trations Example for a standard concentration of 10 mol L select mol L for the unit and not mmol L or mol L 7 5 Using Select the printout format you require for sample measurements If you choose All
9. 14 90 26 10 22 1 116 15 92 13 10 46 1 142 16 94 02 10 69 1 168 17 95 91 10 93 1 194 18 97 81 11 16 1 220 19 99 72 11 40 1 247 20 101 63 11 64 1 273 21 103 56 11 88 1 300 22 105 49 12 12 1 327 A1 2 Table 1 Continued Temp KCl KCl KCl C 1 D 0 1 D 0 01 D 23 107 42 12 36 1 354 24 109 36 12 61 1 381 25 111 31 12 85 1 409 26 113 27 13 10 1 436 27 115 22 13 35 1 464 28 13 59 1 491 29 13 84 1 519 30 14 09 1 547 31 14 34 1 575 32 14 59 1 603 33 14 85 1 632 34 15 10 1 660 35 15 35 1 688 36 15 61 1 717 37 15 86 1 745 38 16 12 1 774 39 16 37 1 803 40 16 63 1 832 41 16 89 1 861 42 17 15 1 890 43 17 40 1 919 44 17 66 1 948 45 17 92 1 977 46 18 18 2 007 47 18 44 2 036 48 18 70 2 065 49 18 96 2 095 50 19 22 2 124 A1 3 Table 2 Resistivity in cm of varying Demal concentra tions of 1 D 0 1 D and 0 01 D KCl solutions Temp KCl KCl KCl C 1 D 0 1 D 0 01 D 0 15 35 140 16 1293 51 1 14 96 136 17 1255 81 2 14 58 132 36 1219 94 3 14 22 128 73 1185 76 4 13 87 125 26 1153 18 5 13 54 121 95 1122 09 6 13 22 118 79 1092 39 7 12 98 115 76 1064 01 8 12 62 112 86 1036 86 9 12 34 110 08 1010 87 10 12 07 107 43 985 97 11 11 81 104 87 962 10 12 11 56
10. 12 V mains adapter Weight 1 0 kg Dimensions H x W x D 9 5 x 28 x 21 5 cm Specifications subject to change without notice A6 5 EMC Standards The CDM230 complies for run 3 Instrument ID 654R003N001 and above with the following regulations Emission Generic standard EN50081 1 1992 Basic standard EN55022 1987 Class B Immunity Generic standard prEN50082 2 1992 Basic standard IEC 801 2 1991 level 3 IEC 801 3 1984 level 3 IEC 801 4 1988 level 3 A6 6 A7 1 Examples of Applications Conductivity Conductivity measurements of a NaCl solution using the CDC565 conductivity cell Programmation Edit METHOD Method A Cell No 1 Mode Conductivity Unit S cm Range selection Autorange Printout Format All Warning Beep Yes Result Beep Yes Edit CALIBRATION Cell 1 Constant Calibrate using 0 05 NaCl Stability Criterion 1 0 min Accept Time 60 s Calibrate every 7 days Cable resistance 0 000 Cable Capacitance 400 pF Edit SAMPLE Sample result Autoread Stability Criterion 1 0 min Accept Time 60 s Pure water correction No Edit Tref Temp correction Enter below Reference temp 25 C Temperature coef 2 20 C A7 2 Results Cell calibration Sample measurements CDM230 Conductivity Meter 654R01N001 3 APR 1998 09 48 SAMPLE Method A Cell No 1 Mode Conductivity Last Cell calibration 27MAR98 08 4
11. ment Harwell U K For the standard seawater a seawater solution salinity 35 of a conductivity of 42 896 mS cm at 15 C must be used With this standard the measurements obtained with the CDM230 fit the tables given by Standard Methods 2520D Algorithm of practical salinity and UNESCO 1981 83 2 7 If you are running a Salinity method we recommend you use the seawater standard solution salinity 35 with a conductivity of 42 896 mS cm at 15 C This standard can be ordered from Ocean Scientific International Brook Road Wormley Surrey GU8 5UB United Kingdom If you are running a TDS method we recommend you to use the 0 05 NaCl solution as the CDM230 calculates the TDS from a conductivity corrected to 18 C using the temperature correction table of a 0 05 NaCl solution see also chapter 8 Theory b Pour the standard solution into the beaker c Dip the conductivity cell and temperature sensor if desired in the standard solution Start stirring Check that the conductivity cell is properly immersed in the solution and that proper stirring is applied The SAM7 Sample Stand which is a combined electrode holder and mag netic stirrer is ideal for setups with the CDM230 Press the key to continue with step d or e d If the previous CDM230 display was Dip cell in standard the next screen is After stabilisation the 4 segments of the STAB indicator are continu ously displayed read the conduc tivi
12. 4 0 5288 Seawater Std 100 3mS 25 0 09 57 24NOV95 0 000 0 5 0 4220 Adjusted 1 408mS cm 25 0 09 01 24NOV95 0 000 0 9 10 TDS calibration data 1 Select a TDS method then press the GLP key 2 Select METHOD with the left or right arrow keys 3 Press the Print key A table is printed out with the last 5 calibration results for the TDS method selected Note In the Value measured column the conductivity measured and corrected to 18 C is printed Concentration method calibration data 1 Select a Concentration method then press the GLP key 2 Select METHOD with the left or right arrow keys 3 Press the Print key A table is printed out with the last 5 calibration results for the concentra tion method selected CDM230 Conductivity Meter 654R01N001 4 DEC 95 10 12 GLP CONCENTRATION CALIBRATION Method A GLP Coefficient Cell Standard Time Date No No No Concentration Conductivity Temp h min C 1 A1 2 294E 04 1 1 1 011mg l 4 41mS cm 25 0 09 37 04DEC95 2 A0 1 300E 00 1 1 1 011mg l 4 41mS cm 25 0 09 04 04DEC95 A1 1 015E 04 2 1 022mg l 4 07mS cm 25 0 A2 8 149E 09 3 1 033mg l 3 78mS cm 25 0 3 A0 1 157E 00 1 1 1 011mg l 1 059mS cm 25 0 08 15 04DEC95 A1 2 286E 04 2 1 022mg l 0 882mS cm 25 0 A2 8 584E 08 3 1 033mg l 0 757mS cm 25 0 CDM230
13. 88 2486 79 402 13 89 2511 20 398 22 90 2535 59 394 38 91 2559 97 390 63 92 2584 33 386 95 93 2608 66 383 34 94 2632 98 379 80 95 2657 27 376 33 96 2681 54 372 92 97 2705 78 369 58 98 2729 99 366 30 99 2754 18 363 08 100 2778 34 359 93 Reference G F Hewitt Chemical Engineering Division U K A E A Research Group Atomic Energy Research Establishment HARWELL U K Oct 1960 A2 1 Connection of Peripherals The CDM230 Conductivity Meter is equipped with sockets for connection of a Printer Personal computer and a recorder In this chapter you will find a description of the pin layout of these sockets The pin layout of the other CDM230 sockets are also described here The sockets on the rear panel are illustrated on page 1 1 Printer PC 9 pin sub D connector see also page 1 4 Cable for printer connection A95P201 for an Epson LX800 or A95P203 for the RADIOMETER ANALYTICAL PRS15 printer Cable for Personal computer connection A95X501 9 9 pin or A95X502 9 25 pin Pin connections 1 No connection 2 Receiving Data input RxD 3 Transmitted Data output TxD 4 Data Terminal Ready output DTR 5 Ground GND 6 No connection DSR 7 Request to Send output RTS 8 Clear to Send input CTS 9 No connection POWER IN input 6 pin DIN input DC power supply for the CDM230 Pin connections 3 0 V ground 6 12 V CDM230 pow
14. Relative measurements Conductivity method only Performing relative measurements 3 3 S Salinity Theory 8 7 Salinity method editing 2 2 Salinity method running 4 1 Stability Criterion 7 7 7 11 7 14 7 17 Standard solutions Preparing 2 6 Stop print after 7 19 Store in GLP 7 19 T TDS Theory 8 9 TDS method editing 5 2 TDS method running 5 7 to 5 11 TDS Factor Definition 8 9 Determination of a TDS factor 5 8 5 9 8 10 Temperature Temperature correction linear correction 8 3 to 8 5 A8 5 Temperature coefficient TC Determination of a TC 8 5 Entry of a TC 7 21 Time Setting the time
15. The conductivity of the sample is measured at the sample s temperature then corrected to a reference temperature Tref to give Tref linear correction or Natural water correction as for a conductivity measurement The sample concentration CSMP is then calculated with the unit selected in Edit Method as follows CSMP A0 A1 Tref A2 Tref 2 A0 A1 and A2 are the coefficients determined during method calibration Limitations of the concentration method For some samples with high concentrations the conductance f concen tration curve may show a maximum for the conductance This can lead to major measurement errors as shown below for the example of HCl For HCl a maximum around 860 mS is obtained for a concentration of about 19 see the curve on the next page Two calibrations have been performed using 3 standards each The two calibration curves obtained are represented in dashed lines on the conductance f concentration curve see next page When performing measurements on a 32 HCl sample using calibration no 1 the CDM230 measures a conductance of 720 mS and finds a con centration of 10 instead of 32 The correct result 32 is obtained if sample measurements are performed using calibration no 2 8 13 Concentration versus conductance for a HCl solution Recommendations To obtain accurate measurements in concentrated samples some precau tions must be taken 1 For the sample analysed
16. and hold the Method key down for 3 seconds to enter the Edit Method mode Select the conductivity cell Cell 1 Cell 2 or Cell 3 for measurements with Using select whether you want to perform conductivity resistivity salinity TDS or concentration measurements If Resistivity or Concentration is selected the next display is Unit selection see page 7 4 If TDS or Salinity is selected the next display is Printout format see page 7 5 Using If Conductivity has been selected select one of the following options for the conductance range of the sample measurements Autorange the optimum range is set automatically by the CDM230 while perform ing measurements Manual range the range is set by the user just after having selected the method Use the Manual range option if you frequently want to select another conductance range of the method without entering the Edit Method mode Fixed range the range is set in the next display of the Edit Method mode see below The range cannot be changed without entering the Edit mode Use the Fixed range option if you always want a specific conductance measurement range METHOD A CELL1 C CONDUCTIVITY USE CELL 1 2 3 METHOD A FIXED RANGE METHOD A MANUAL RANGE CONDUCTIVITY AUTORANGE Method 3 seconds METHOD A CONCENTRATION METHOD A TDS METHOD A SALINITY METHOD A RESISTIVITY METHOD A CONDUCTIVITY 7 4 UNIT SELECTION m
17. the cell constant the TDS of the standard the conductivity measured and corrected to 18 C for the standard the standard temperature the measurement time and TDS Factor calculated Example Note If the TDS Factor calculated is out of the range 0 010 9 999 the TDS Factor value will be replaced by the Out of range error message If the measurement signal has not stabilised at the end of the Accept time entered in Edit Calibration the Unstable error message will be printed with the TDS Factor value CDM230 Conductivity Meter 654R01N001 15 NOV 1995 09 48 TDS CALIBRATION Method A Cell No 1 Cell Constant 0 5288 cm 1 TDS of standard 501 1 mg l Conductivity 0 911 mS cm Temperat ure 25 0 C Measurement Time 23 s TDS Factor 0 55 mg l 9 4 2 Concentration method The following information is automatically printed out at the end of a Con centration method calibration the instrument ID entered during Edit Print the date and time the method name A B or C the cell number A table is also printed out with the standard number 1 2 or 3 the concen tration of the standard in the unit selected in Edit Method the standard temperature the conductivity measured in the standard and the measure ment time The calibration results concentration coefficients calculated are printed out below the table Example CDM230 Conduct
18. you must know if the conductance f concentration curve shows a maximum for the conductance If it is the case the concentration value Cmax must be known 2 A calibration on 3 standards must be performed with the following recommendation the 3 standard concentrations must be greater or less than the Cmax value 10 Concentration in by weight Conductance at 25 C in mS 0 480 120 240 360 600 720 40 30 20 960 840 Cmax Calibration no 1 Calibration no 2 32 8 14 List of references 1 Pure Water correction ASTM D1125 91 2 Natural Water temperature correction ISO DIN 7888 Bibliography WAGNER R Temperaturkorrekturfaktoren f r die elektrische Leitf higkeit von W ssern Z Wasser Abwasserforsch 2 1980 3 Standard methods for the examination of water and wastewaters 18th Edition 1992 Editors Arnold E Greenberg Lenore S Clesceri Andrew D Eaton 2520D Algorithm of practical salinity 4 Standard methods for the examination of water and wastewaters 18th Edition 1992 Editors Arnold E Greenberg Lenore S Clesceri Andrew D Eaton part 2520B 5 Standard methods for the examination of water and wastewaters 18th Edition 1992 Editors Arnold E Greenberg Lenore S Clesceri Andrew D Eaton part 2540C page 2 55 6 Standard methods for the examination of water and wastewaters 18th Edition 1992 Editors Arnold E Greenberg Lenore S Clesceri
19. 17 The Stability criterion set in this display will determine when the electrode signal is ac cepted as being stable e g when the drift is less than 1 0 of the measured value per minute the result will be locked on the display If is selected using the left or right arrow keys the sliding stability indicator uses 1 min and the measurement will only be accepted at end of the Accept time set on the next display Range available 0 1 to 99 9 min and no Stability criterion In the example shown the signal will be accepted and locked on the display after 60 seconds irrespective of the measurement stability If you only want the electrode signal to be accepted when it is stable adjust to with the left or right arrow keys Range available 1 to 9999 seconds and no Accept time Note The result will be locked on the display as soon as either the Stabil ity criterion or the Accept time is reached If the Stability criterion and Accept time are both set to the measurement must be accepted manually by pressing the key Using Select Yes if you want to subtract the conduc tivity of pure water from the measured conduc tivity The pure water correction takes the sample temperature into account see chapter 8 Theory Note the pure water correction is not available for a Salinity a TDS or a Concentration method The pure water correction is not available i
20. 2 5 A2 3 CELL input 6 pin DIN socket for connection of the conductivity cell with 2 or 4 poles and a temperature sensor Pin connections 1 Pole no 1 2 Pole no 2 3 Pole no 3 4 Pole no 4 also connected to pin no 5 5 0 V ground 6 Temperature sensor Potential imposed between poles 2 and 3 200 mV constant for all ranges except the 2 S range 40 mV constant The current passing through poles 1 and 4 is measured The potential between poles 1 and 4 cannot exceed 3 V in absolute value Temperature sensor input 1 CINCH socket Connecting the VIT90 Video Titrator to the CDM230 Conductivity Meter Connect the cable between the CDM230 PRINTER PC terminal and the BURETTE I O terminal no 3 on the VIT90 see pin layout of connecting cable part no A95A220 below 9 pin female 5 pin male connector connector to the CDM230 to the VIT90 NOTE The CDM230 must be set to 2400 baud press the Print key for 3 seconds and select with the left or right arrow key The AUTORANGE mode should be selected for conductivity measurements 2 Rx 3 Tx 4 DTR 5 0V 6 DSR 1 3 2 4 5 6 4 5 3 2 1 A3 1 Default Values The default values are those which are used when the error message MEMORY ERROR DATA MEMORY is displayed for example after a battery failure The default data are displayed below Edit mode options Parameter Value Method Cell number Cell 1 Method ty
21. 2 2 U Unit selection 7 4 W Warning beep 7 5 A8 6
22. Edit Cell Calibration see page 5 3 Press the left or right arrow keys If you press the key by mistake press the up arrow key The next screen must be TDS FACTOR METHOD B Press the key The next display depends on the options selected in the Edit Method Calibration mode see page 5 4 If Lock current Cal Yes has been selected in Edit Calibration mode The TDS factor entered in the Edit Calibration mode is displayed You can start sample measurements using the current method If Lock current Cal No has been selected in Edit Calibration mode The TDS factor is to be determined by a calibration using a standard of known TDS 501 1 mg L in our example METHOD B CELL2 TDS TDS FACTOR METHOD B Cal CELL 2 CONST 1 000cm 1 CELL 2 CONST CALIBRATION or CELL 2 CONST 1 000 cm 1 or TDS FACTOR 0 576 DIP CELL IN STD 501 1 mg l or 5 9 If Lock current Cal No has been selected in Edit Calibration mode Take or prepare carefully your standard solution solution of known TDS As for the cell calibration we recommend you use the 0 05 NaCl solution as the standard TDS 501 1 mg l conductivity at 18 C 873 36 S cm and TDS factor 501 1 873 36 0 574 Pour the standard solution into the beaker Dip the conductivity cell and temperature sensor if desired in the standard solution Start stirring Check that the conductivity cell is properly immersed in the solution
23. Factor option the TDS Factor entered will be displayed To determine the TDS Factor by performing a method calibration select Lock current Cal No METHOD A CELL1 TDS CELL 1 CONSTANT METHOD CAL EDIT CELL 1 CAL Cal 3 seconds LOCK CURRENT CAL NO YES 7 11 If Lock current Cal Yes adjust the TDS Factor using Range available 0 010 and 9 999 After having entered the TDS Factor press the up arrow key or leave the Edit Calibration mode by pressing the Method Sample Cal or Tref key If Lock current Cal No adjust the TDS of the standard used for method calibration using Range available 0 000 to 9999 mg L Note 501 1 mg L is the default value it is the TDS of a 0 05 NaCl solution The stability criterion set in this display will determine when the electrode signal is accepted as being stable In our example when the drift is less than 1 0 of the measured value per minute the TDS Factor will be calculated and displayed If the Stability criterion is set to using the left or right arrow keys the TDS Factor will be calculated at the end of the Accept time set on the next display Range available 0 1 to 99 9 min and no criterion Adjust the Accept time using In the example shown the TDS Factor will be calculated after 60 seconds irrespective of the measurement stability If you only want the TDS Factor to be calculated when the measurement is stable set the A
24. However the following message may be displayed This message reminds you that you have to calibrate the conductivity cell regularly e g weekly Press the Cal key and start a cell calibration see page 5 7 Another message may be displayed This message reminds you that you may have to recalibrate the method regularly e g every 100 days Press the Cal key and start a new method calibration see pages 5 8 Important A reliable sample measurement requires the exact cell constant and TDS factor The maximum time interval between 2 cell or 2 method calibrations is a user defined parameter set in the Edit Calibration mode After having pressed the Sample key the Sample ID number is displayed for 3 seconds This number is incremented each time a sample measure ment procedure is initiated The sample measurement is then carried out in the same way as for a conductivity measurement see pages 2 13 to 2 15 NEW CELL CAL REQUIRED NEW METHOD CAL REQUIRED METHOD B CELL2 TDS Sample 5 11 TDS method cell and method Calibrations Display Overview METHOD B CELL2 TDS EDIT METHOD CAL Cal 3 seconds LOCK CURRENT CAL NO YES TDS OF STANDARD 501 1 mg l TDS FACTOR 0 574 Or 5 12 METHOD B GLP SAMPLE METHOD B GLP METHOD METHOD B GLP CELL 1 TDS FACTOR 0 576 1 STANDARD 501 1mg l GLP Table If the GLP key is pressed after having selected a TDS method the 3 following options ar
25. SAMPLE RESULT AT INTERVALS PRINT INTERVAL 60 s Sample 3 seconds 7 19 In the example shown the printing of measurement data will automatically stop after 10 minutes The printing will continue indefinitely if is adjusted using the left or right arrow keys To stop the measurement press the Sample Cal Tref or Method key Range available 1 to 5999 minutes or Using Select which results you want to store in the GLP table If you choose ALL RESULTS the result at the end of each interval will be stored in the GLP table If you choose NO RESULTS there will be no results stored in the GLP table If you choose LAST RESULT the very last result will be stored in the GLP table Note Only the last 50 results can be stored in the GLP table Using Select Yes if you want to subtract the conductiv ity of pure water from the measured conductiv ity The pure water correction takes the sample temperature into account see chapter 8 Theory Note the pure water correction is not available for a Salinity a TDS or a Concentration method The pure water correction is not available if Temp correction None has been selected in Edit Tref Press the up arrow key or leave the Edit Sample mode by pressing the Method Sample Cal or Tref key STORE IN GLP LAST RESULT STORE IN GLP NO RESULTS STORE IN GLP ALL RESULTS STOP PRINT AFTER 1 min PURE WATER CORRECTION YES PURE WATER CORR
26. T Tref key routine mode gt C lt C Cal key routine mode gt S lt S Sample key routine mode gt G lt G GLP key routine mode gt P lt P Print key routine mode gt K lt K key gt L lt L Left arrow key gt R lt R Right arrow key gt U lt U Up arrow key gt D lt D Down arrow key gt m lt m Method key edit mode gt t lt t Tref key edit mode gt c lt c Cal key edit mode gt s lt s Sample key edit mode A4 2 Command Answer Comments gt g lt g GLP key edit mode gt p lt p Print key edit mode The gt KD command answer lt KD disables the instrument keyboard After this command is received the keyboard is inactive Sending the gt KE answer lt KE will enable the CDM230 keyboard again A5 1 Accessories Accessories Supplied The CDM230 comes in different versions depending on the power adapter to be used CDM230 Conductivity Meter 115 V version R21M041 including Adapter 115 V 60 Hz Unregulated 12 V 1 A A66B002 CDM230 Conductivity Meter 230 V version R21M040 including Adapter 230 V 50 Hz Unregulated 12 V 1 A A66B001 Accessories Available The following accessories are available to make a complete MeterLab setup SAM7 Sample Stand 391 543 Power supply cable from CDM230 to SAM7 A95A110 CDC641T Conductivity Cell with built in temperature B15B001 sensor platinised CDC741T Conductivity Cell 2
27. along the text line The most recent calibration result is always shown first and is stored as entry no 1 When the down arrow key is pressed the next result entry no 2 will appear 7 1 The Edit Mode The Edit mode of the CDM230 comprises 6 parameter categories which allow you to configurate your CDM230 with parameters that are common to all methods These are the 2 Edit mode options PRINT and GLP edit a method in order to fit your specific tasks These are the 4 Edit mode options METHOD CALIBRATION SAMPLE and Tref Editing a Method Editing a method is performed as follows 1 Select one of the 3 available methods A B or C 2 Select one of the 3 available conductivity cells Cell 1 Cell 2 or Cell 3 and edit the parameters that are common to calibration and sample measurement procedures hold the Method key down for 3 seconds and follow the instructions on pages 7 3 to 7 5 3 Define the calibration to be performed with the conductivity cell se lected Edit the calibration data hold the Cal key down for 3 seconds and follow the instructions on pages 7 6 to 7 9 4 If a TDS or a concentration method is edited define the calibration to be performed with the method Edit the calibration data hold the Cal key down for 3 seconds and follow the instructions on pages 7 10 to 7 15 5 Define the sample measurement to be performed with the method and conductivity cell selected Edit the sample data
28. also page 5 2 Editing the Method parameters Press the Cal key for 3 seconds to enter the Edit Calibration mode Using Select Edit Cell 2 Cal then press the down arrow key We recommend you to use the 0 05 NaCl solution select Calibrate using 0 05 NaCl as the standard for the cell calibration conductivity at 18 C 873 36 S cm METHOD B CELL2 TDS EDIT CELL 2 CAL Cal 3 seconds CALIBRATE USING SEAWATER STD CELL 1 CONSTANT ADJUSTED CELL 1 CONSTANT ENTERED CELL 2 CONSTANT ENTER BELOW CALIBRATE USING 0 05 NaCl CALIBRATE USING 0 01 KCl CALIBRATE USING 0 1 KCl CALIBRATE USING 1 KCl CELL 2 CONSTANT or STABILITY CRIT ACCEPT TIME CALIBRATE EVERY CABLE RESISTANCE CABLE CAPACITANCE See pages 7 6 to 7 9 5 4 B3 Editing the Calibration Method parameters Using Select the TDS method B for example you want to calibrate If the method is not TDS or the method does not use the correct conductivity cell Cell 2 for example hold the Method key down for 3 seconds and select a TDS method and or the correct cell See also page 5 2 Editing the Method parameters Press the Cal key for 3 seconds to enter the Edit Calibration mode Using Select Edit Method Cal then press the down arrow key If you want the method calibration results TDS Factor to be locked select Lock current Cal Yes using In this case the TDS Factor is entered in the Edit mode on the next
29. and that proper stirring is applied The SAM7 Sample Stand which is a combined electrode holder and magnetic stirrer is ideal for setups with the CDM230 Press the key to continue If no temperature sensor is connected the temperature must be adjusted manually using the left or right arrow keys Press the key to continue Note If a temperature sensor is connected the temperature will be measured directly and the TEMP OF STANDARD display will not appear The measurement can be followed on the display by means of the conductivity reading and the visual STABility indicator After stabilisation the 4 segments of the STAB indicator are continuously displayed the CDM230 calculates and displays the TDS factor The TDS factor is stored in the GLP memory for the current method The calibration is completed You can start a sample measurement by pressing the Sample key TEMP OF STANDARD 25 0 C DIP CELL IN STD 501 1 mg l TDS FACTOR 0 589 5 10 E Performing TDS sample Measurements Using Select the TDS method with the correct cell method B with Cell 2 for example and press the Sample key If there is no TDS method or if the TDS method does not use the correct conductivity cell Cell 2 for example hold the Method key down for 3 seconds and select a TDS method and or the correct cell See also page 5 2 Editing the Method parameters Pressing the Sample key will normally start the measurement
30. available values 0 00 to 9 99 C See also the chapter 8 Theory 7 23 Edit GLP The following settings are common to all methods The current time and date and the activation or desactivation of a keyboard beep are set here Hold the GLP key down for 3 seconds to enter the Edit GLP mode Using adjust the hour and minute Using adjust the year month and day Using adjust whether you want a Keyboard Beep to sound at each keystroke or not To leave the Edit GLP mode press the Method Sample Cal or Tref key GLP KEYBOARD BEEP NO YES CURRENT TIME MINUTES 34 CURRENT TIME HOURS 14 CURRENT DATE DAY 23 CURRENT DATE MONTH APR CURRENT DATE YEAR 95 3 seconds 7 24 Edit PRINT The following settings are common to all methods The configuration parameters of the PC PRINTER serial link and the instrument ID number are set here Hold the Print key down for 3 seconds to enter the Edit Print mode Using select between the PC PRINTER output format The parameters must be selected in accordance with those defined on the PC or the printer Using adjust the instrument ID Rxxx xxx being a number between 001 and 999 If is selected with the left or right arrow keys the instrument ID is set to 654R N000 and the instrument ID will be not printed in the tables Adjust the instrument ID in the same way Nxxx is a number between 000 and 999 To leave the Edit Print mode press the Met
31. display Select Lock current Cal Yes then press the down arrow key if you know the TDS factor and do not want to perform a method calibration To determine the TDS Factor by performing a method calibration select Lock current Cal No then press the down arrow key If Lock current Cal Yes adjust the TDS Factor using Range available 0 010 and 9 999 If Lock current Cal No adjust the TDS of the standard used for method calibration using Range available 0 000 to 9999 mg l Note 501 1 mg L is the default value it is the TDS of a 0 05 NaCl solution We recommend you to use this solution to calibrate the method METHOD B CELL2 TDS EDIT METHOD CAL Cal 3 seconds LOCK CURRENT CAL NO YES TDS OF STANDARD 501 1 mg l TDS FACTOR 0 574 Or 5 5 The stability criterion set in this display will determine when the electrode signal is accepted as being stable In our example when the drift is less than 1 0 of the measured value per minute the TDS Factor will be calculated and displayed If the Stability criterion is set to using the left or right arrow keys the TDS Factor will be calculated at the end of the Accept time set on the next display Range available 0 1 to 99 9 min and no criterion Adjust the Accept time using In the example shown the TDS Factor will be calculated after 60 seconds irrespective of the measurement stability If you only want the TDS Factor to be c
32. entry no 1 When the down arrow key is pressed the next result entry no 2 will appear 1 STANDARD 0 870mS cm 1 STANDARD 25 0 C 1 DATE TIME 29NOV95 10 02 1 STANDARD UNSTABLE 6 1 Concentration Measurements To perform Concentration measurements with the CDM230 A Select a Concentration method B Edit the Concentration method i e B1 Edit the Method parameters B2 Edit the Calibration cell parameters B3 Edit the Calibration method parameters B4 Edit the Sample parameters C Calibrate the cell i e determine the cell constant of the conductivity cell D Calibrate the method i e determine the 1 to 3 concentration coefficients of the equation that gives the concentration as a function of the measured conductivity E Perform Concentration measurements on your samples A Selecting a Concentration method 1 Switch on the CDM230 with the on off switch then select the language if necessary See page 2 2 for more information 2 The CDM230 automatically switches to the method selection display Select a Concentration method A B or C having the right cell Cell 1 Cell 2 or Cell 3 Use the left and right arrow keys Example Method B with Cell 2 Important If there is no Concentration method programmed you have to edit the method parameters following the paragraph B1 see next page METHOD A CELL1 CONDUCTIVITY METHOD B CELL2 CONCENTRATION 6 2 B1 Editing the Method paramete
33. if a cell used has a constant value of 3 cm 1 it means that the conductance measured varies between 5 S 15 3 and 45 S 135 3 and that the 400 S cm range must be selected as the conductance range 2 Edit a conductivity method using the Manual or Fixed range function and the Reset reading Yes option see pages 7 3 and 7 4 Select the conductance range found in step 1 in the Edit Method mode as explained on page 7 3 if a Fixed range has been selected from the method selection display as explained on page 3 1 if a Manual range has been selected 3 Press the Sample key After the Next sample No and Sample temp displays the CDM230 displays STAB STAB 1 167mS cm NO RESET STAB STAB 1 167mS cm RESET READING 3 4 4 Select Reset Reading and press the key The CDM230 now displays 0 000 for the conductivity The conductivity displayed will now be the difference between the conductivity of the sample and the conductivity value measured when key was pressed You can follow the change in conductivity with time 5 If you press the key a new relative conductivity measurement is initiated The CDM230 uses the offset value that was measured when the Reset reading option was accepted by pressing the key Each time the key is pressed a new relative measurement is initiated If you press any other key the offset value stored is reset to 0 For example if you press the Sample key and sele
34. measurement must be accepted manually by pressing the key STABILITY CRIT 1 0 min ACCEPT TIME 60 s CELL 1 CONSTANT 1 0000 cm 1 7 8 Using If you choose one of the five Calibrate using options or Cell constant Adjusted adjust the maximum time interval between two calibra tions The CDM230 prompts you to perform a new calibration if the current calibration is older than for example 7 days Range available 1 to 999 days To obtain the most accurate conductance measurements in the 2 S or 400 mS range measurements of sample resistances of less than 50 adjust the resistance of the cell cable using Range available 0 to 1 999 The cable resistance values of some conductivity cells are listed below Conductivity CDC641T CDC741T CDC749 CDC565 CDC865 CL136 CL336 cell or cable Resistance 0 260 0 610 0 180 0 0 0 145 0 350 in Press the down arrow key and enter in the same way the Cable Capacitance Range available 0 to 1999 pF Note Correction for the cable capacitance is only performed in the 4 000 S range because the cable capacitance has nearly no influence on low conductivity measurements Any value below 350 pF will not disturb the measurements enter 0 pF for the cable capacitance CALIBRATE EVERY 7 DAYS CABLE RESISTANCE 0 000 CAB CAPACITANCE 0 pF 7 9 The cable capacitance values of some conductivity cells are listed below Conductivity C
35. out on the 2 35 C range for a Natural water correction or does not satisfy the condition of page 9 4 for linear temperature correc tion After correcting the fault press the key or Tref to continue 10 3 UNSTABLE During AUTOREAD measurements if the Stability criterion is not satisfied at the end of the Accept time entered in Edit Sample mode During AT INTERVALS measurements if the Stability criterion is not satisfied at the end of the Print interval or Stop print after entered in Edit Sample mode Check cell connections cell and stirring conditions You may also edit the Sample parameters increase the Stability crite rion or Accept time After correcting the fault press the or the Sample key to continue OUT OF RANGE This message appears if the during measurements measurements are above or below the CDM230 specifications see appendix 6 If the conductivity range is selected manually this message appears when the conductance measurements are above the range selected Check the condition of the cell and con nection cell input Select a higher con ductance range in the Edit Method mode see pages 7 3 and 7 4 or from the method selection display see page 2 2 OUT OF RANGE This message appears if the cell constant after a Cell Calibration calculated is outside the 0 05 to 15 cm 1 range Check the condition of the cell and con nection cell input Check the concentration o
36. the coefficients obtained during calibration To determine the concentration of the sample the CDM230 performs steps 1 2 3 5 and 9 given on page 8 1 Step 9 is described in detail below Steps 1 2 3 are described on pages 8 1 and 8 2 and step 5 on pages 8 3 to 8 5 Determination of the concentration coefficients Method calibration A calibration using 1 to 3 standards of known concentration is performed For each standard the conductivity of the standard is measured at the standard s temperature the conductivity of the standard is corrected to a reference tempera ture Tref linear correction or natural water correction as for a conduc tivity measurement At end of the method calibration for method A for example the CDM230 calculates and displays the A0 A1 and A2 coefficients of the following equation C A0 A1 Tref A2 Tref 2 8 12 With C concentration with the unit selected in the Edit Method mode Tref conductivity measured at the Tref reference temperature If a 1 standard calibration is performed A0 and A2 are equal to 0 If a 2 point calibration is performed A2 0 Note All the measurements of the standards must be performed at the same temperature To obtain the most accurate measurements it is recom mended to thermostat the standards and the samples at the reference temperature Tref selected in the Edit Tref mode Determination of the sample concentration
37. to enter or determine this value 4 types of cell calibrations can be performed with the CDM230 depending on the option entered in the EDIT Calibration mode Cell constant Enter below Entered Adjusted or Calibrate using Important Do not enter the cell constant indicated on the conductivity cell and perform a cell calibration using one of the two following options Cell constant Adjusted or Calibrate using At the end of a cell calibration the CDM230 will take into account the cell constant for sample measurements using the conductivity cell selected Cell 1 Cell 2 or Cell 3 Before starting a calibration Press the Method key and select a method A B or C with the cell you want to calibrate Operating instructions See also the display overview page 2 10 Press the Cal key Depending on the option entered in the Edit Calibration mode one of the 4 following screens is displayed Note If a TDS or Concentration method is used you first have to select between a cell or a method calibration as shown on the display overviews on pages 5 4 and 6 6 This display appears if Cell constant Enter below has been selected in the Edit Calibration mode The cell constant is dis played and cannot be changed CELL 1 CONSTANT 1 0000 cm 1 2 5 here Check the constant value and start sample measurements by pressing the Sample key This display appears if Cell con stant Entered has been selected in the Edit Calib
38. x 10 2M 10 2M 0 65 41 7 15 1 521 0 776 1 67 13 7 36 1 566 0 800 2 68 86 7 57 1 612 0 824 3 70 61 7 79 1 659 0 848 4 72 37 8 00 1 705 0 872 5 74 14 8 22 1 752 0 896 6 75 93 8 44 1 800 0 921 7 77 73 8 66 1 848 0 945 8 79 54 8 88 1 896 0 970 9 81 36 9 11 1 945 0 995 10 83 19 9 33 1 994 1 020 11 85 04 9 56 2 043 1 045 12 86 89 9 79 2 093 1 070 13 88 76 10 02 2 142 1 095 14 90 63 10 25 2 193 1 121 15 92 52 10 48 2 243 1 147 16 94 41 10 72 2 294 1 173 17 96 31 10 95 2 345 1 199 A1 6 Table 3 Continued Temp KCl KCl KCl KCl C 1M 10 1M 2 x 10 2M 10 2M 18 98 22 11 19 2 397 1 225 19 100 14 11 43 2 449 1 251 20 102 07 11 67 2 501 1 278 21 104 00 11 97 2 553 1 305 22 105 94 12 15 2 606 1 332 23 107 89 12 39 2 659 1 359 24 109 84 12 64 2 712 1 386 25 111 80 12 88 2 765 1 413 26 113 77 13 13 2 819 1 441 27 115 74 13 37 2 873 1 468 28 13 62 2 927 1 496 29 13 87 2 981 1 524 30 14 12 3 036 1 552 31 14 37 3 091 1 581 32 14 62 3 146 1 609 33 14 88 3 201 1 638 34 15 13 3 256 1 667 35 15 39 3 312 36 15 64 3 368 A1 7 Table 4 Resistivity in cm of varying molar concentra tions of KCl solutions Temp KCl KCl KCl KCl C 1M 10 1M 2 x 10 2M 10 2M 0 15 29 139 86 657 46 1288 66 1
39. 098 67 910 19 30 1119 92 892 92 31 1141 30 876 19 32 1162 80 859 99 33 1184 41 844 30 34 1206 15 829 09 35 1228 00 814 34 36 1249 96 800 03 37 1272 03 786 15 38 1294 21 772 67 39 1316 49 759 59 40 1338 89 746 89 41 1361 38 734 55 42 1383 97 722 56 43 1406 66 710 90 44 1429 44 699 57 45 1452 32 688 55 46 1475 29 677 83 47 1498 34 667 40 48 1521 48 657 25 49 1544 71 647 37 50 1568 01 637 75 51 1591 39 628 38 52 1614 84 619 25 53 1638 37 610 36 54 1661 97 601 70 55 1685 63 593 25 A1 12 Table 7 Continued Temp Conductivity Resistivity C 56 1709 36 585 02 57 1733 15 576 99 58 1756 99 569 15 59 1780 90 561 51 60 1804 85 554 06 61 1828 86 546 79 62 1852 92 539 69 63 1877 02 532 76 64 1901 16 525 99 65 1925 34 519 39 66 1949 56 512 94 67 1973 82 506 63 68 1998 10 500 47 69 2022 42 494 46 70 2046 76 488 58 71 2071 13 482 83 72 2095 52 477 21 73 2119 93 471 71 74 2144 35 466 34 75 2168 79 461 09 76 2193 24 455 95 77 2217 71 450 92 78 2242 17 446 00 79 2266 65 441 18 80 2291 12 436 47 81 2315 60 431 85 82 2340 08 427 34 83 2364 55 422 91 84 2389 02 418 58 A1 13 Table 7 Continued Temp Conductivity Resistivity C 85 2413 47 414 34 86 2437 92 410 19 87 2462 36 406 11
40. 1 099mS cm 1 STANDARD 1 25 0 C 1 STANDARD 2 10 00mg l 1 STANDARD 1 UNSTABLE 6 17 Press The next display shows the conductivity measured for the second standard if a 2 point calibration was performed if not the value displayed is Press If the measurement was unstable at the end of the Accept time Press The next display shows the temperature entered or measured of the second standard if a 2 point calibration was performed if not the value dis played is Press The display shows the concentration of the third standard and the unit the concentration is expressed in If a 1 or 2 point calibration was per formed the displayed value is Press The next display shows the conductivity measured for the third standard if a 3 point calibration was performed if not the value displayed is Press The next display shows the temperature entered or measured of the third standard if a 3 point calibration was performed if not the value displayed is Press one last time The date and time at which the method calibration was performed are now shown 1 STANDARD 2 10 40mS cm 1 STANDARD 2 UNSTABLE 1 STANDARD 2 25 0 C 1 STANDARD 3 mg l 1 STANDARD 3 1 STANDARD 3 C 1 DATE TIME 29NOV95 10 07 6 18 If you wish to see previous method calibration results press the down arrow key and then use the left arrow key to move
41. 102 42 939 21 13 11 31 100 07 917 23 14 11 08 97 81 896 13 15 10 85 95 63 875 84 16 10 64 93 54 856 33 17 10 43 91 53 837 57 18 10 22 89 59 819 50 19 10 03 87 72 802 10 20 9 84 85 92 785 33 21 9 96 84 18 769 16 22 9 48 82 50 753 56 23 9 31 80 88 738 50 24 9 14 79 32 723 97 25 8 98 77 81 709 93 26 8 83 76 35 696 36 A1 4 Table 2 Continued Temp KCl KCl KCl C 1 D 0 1 D 0 01 D 27 8 68 74 94 683 24 28 73 57 670 56 29 72 25 658 28 30 70 97 646 40 31 69 73 634 90 32 68 52 623 75 33 67 36 612 95 34 66 23 602 48 35 65 14 592 33 36 64 08 582 49 37 63 04 572 93 38 62 04 563 66 39 61 07 564 65 40 60 13 545 91 41 59 21 537 42 42 58 32 529 16 43 57 46 521 14 44 56 62 513 33 45 55 80 505 75 46 55 00 498 37 47 54 23 491 18 48 53 47 484 19 49 52 74 477 39 50 52 02 470 76 Reference Organisation Internationale de M trologie L gale OIML Recommendation n 56 and The National Institute of Standards and Technology NIST Journal of Solution Chemistry Vol 20 no 4 1991 For the 1 Demal KCl solution Extrapolation of the NIST results from OIML conductivity values at 0 C 18 C and 25 C A1 5 Table 3 Conductivity in mS cm of varying molar concen trations of KCl solutions Temp KCl KCl KCl KCl C 1M 10 1M 2
42. 14 90 135 87 638 57 1250 00 2 14 52 132 10 620 35 1213 59 3 14 16 128 37 602 77 1179 25 4 13 82 125 00 586 51 1146 79 5 13 49 121 66 570 78 1116 07 6 13 17 118 48 555 56 1085 78 7 12 87 115 47 541 13 1058 20 8 12 57 112 61 527 43 1030 93 9 12 29 109 77 514 14 1005 03 10 12 02 107 18 501 50 980 39 11 11 76 104 60 489 48 956 94 12 11 51 102 15 477 78 934 58 13 11 27 99 80 466 85 913 24 14 11 03 97 56 456 00 892 06 15 10 81 95 42 445 83 871 84 16 10 59 93 28 435 92 852 51 17 10 38 91 32 426 44 834 03 18 10 18 89 37 417 19 816 33 19 9 99 87 49 408 33 799 36 A1 8 Table 4 Continued Temp KCl KCl KCl KCl C 1M 10 1M 2 x 10 2M 10 2M 20 9 80 85 69 399 84 782 47 21 9 62 83 96 391 70 766 28 22 9 44 82 31 383 73 750 75 23 9 27 80 71 376 08 735 84 24 9 10 79 11 368 73 721 50 25 8 94 77 64 361 66 707 71 26 8 79 76 16 354 74 693 96 27 8 64 74 79 348 07 681 20 28 73 42 341 65 668 45 29 72 10 335 46 656 17 30 70 82 329 38 644 33 31 69 59 323 52 632 51 32 68 40 317 86 621 50 33 67 20 312 40 610 50 34 66 09 307 13 599 88 35 64 98 301 93 36 63 94 296 91 A1 9 Table 5 Average temperature coefficients of standard elec trolyte solutions expressed as C of the conduc tivity value at 25 C Temperature KCl KCl KCl Saturate
43. 2 Cell Constant value 1 2468 cm 1 Sample Result Error Temp Meas Time No C mm ss hh mm ss 6 12 16 mS cm 23 1 00 14 09 49 02 CDM230 Conductivity Meter 654R01N001 27 MAR 1998 08 42 CELL CALIBRATION Cell No 1 Cell Constant calibrated using 0 05 NaCl Conductance 39 2 mS Temperature 25 0 C Measurement Time 14 s Cell Constant value 1 2468 cm 1 A7 3 Resistivity Resistivity measurements of a NaCl solution using the CDC565 conductiv ity cell Programmation Edit METHOD Method B Cell No 1 Mode Resistivity Unit cm Printout Format All Warning Beep Yes Result Beep Yes Edit CALIBRATION Cell 1 Constant Calibrate using 0 05 NaCl Stability Criterion 1 0 min Accept Time 60 s Calibrate every 7 days Cable resistance 0 000 Cable Capacitance 400 pF Edit SAMPLE Sample result Autoread Stability Criterion 1 0 min Accept Time 60 s Pure water correction No Edit Tref Temp correction Enter below Reference temp 25 C Temperature coef 2 20 C A7 4 Results Cell calibration Sample measurements CDM230 Conductivity Meter 654R01N001 3 APR 1998 10 10 SAMPLE Method B Cell No 1 Mode Resistivity Last Cell calibration 27MAR98 08 42 Cell Constant value 1 2468 cm 1
44. 2 for example hold the Method key down for 3 seconds and select a Concentration method and or the correct cell See also page 6 2 Editing the Method parameters Pressing the Sample key will normally start the measurement However the following message may be displayed This message reminds you that you have to calibrate the conductivity cell regularly e g weekly Press the Cal key and start a cell calibration see page 6 8 Another message may be displayed This message reminds you that you may have to recalibrate the method regularly e g every 100 days Press the Cal key and start a new method calibration see pages 6 9 Important A reliable sample measurement requires the exact cell constant and concentration coefficients The maximum time interval between 2 cell or 2 method calibrations is a user defined parameter set in the Edit Calibration mode After having pressed the Sample key the Sample ID number is displayed for 3 seconds This number is incremented each time a sample measurement procedure is initiated The sample measurement is then carried out in the same way as for a conductivity measurement see pages 2 13 to 2 15 NEW CELL CAL REQUIRED NEW METHOD CAL REQUIRED METHOD B CELL2 CONCENTRATION Sample 6 14 CELL 1 CONST 1 000 cm 1 CONC COEFF METHOD B Cal CELL 1 CONST CALIBRATION If Method Cal locked If Method Cal not locked If no temperature sensor connected STAB 0
45. 3 Use the left and right arrow keys Example Method B with Cell 2 Important If there is no TDS method programmed you have to edit the method parameters following the paragraph B1 see next page METHOD A CELL1 CONDUCTIVITY METHOD B CELL2 TDS 5 2 B1 Editing the Method parameters Select a method A B or C with and hold the Method key down for 3 seconds to enter the Edit Method mode For example method B Select the conductivity cell Cell 1 Cell 2 or Cell 3 used for TDS measurements with For example Cell 2 Using select TDS Using Select the printout format you require for sample measurements If you choose All the cell constant and TDS factor will be included in the printout see also chapter 9 Using Select Yes if you want a Warning Beep three short tones to accompany any warning message Using Select Yes if you want a Result Beep one long tone to sound when a result has been obtained METHOD B CELL1 CONDUCTIVITY USE CELL 1 2 3 METHOD B TDS Method 3 seconds RESULT BEEP NO YES WARNING BEEP NO YES PRINTOUT FORMAT ALL PRINTOUT FORMAT RESULT 5 3 B2 Editing the Calibration cell parameters Using Select the TDS method B for example you want to calibrate the cell Cell 2 for example If the method is not TDS or the method does not use the correct cell hold the Method key down for 3 seconds and select a TDS method and or the correct cell See
46. 4 000mS RANGE SIGNAL lt 1 OF 4 000mS RANGE or or Select a conductance range METHOD A CELL1 CONDUCTIVITY 3 2 SIGNAL gt 100 OF 4 000 S RANGE SIGNAL gt 100 OF 40 00 S RANGE SIGNAL gt 100 OF 400 0 S RANGE SIGNAL 26 6 OF 4 000mS RANGE SIGNAL 2 66 OF 40 00mS RANGE SIGNAL lt 1 OF 400 0mS RANGE SIGNAL lt 1 OF 2 000S RANGE If a range can be selected dip the conductivity cell into the sample and using the left or right arrow keys adjust the conductance range in order to have a displayed Signal between 10 and 100 the best reading is obtained in this way Example Here the best resolution is obtained on the 4 000 mS range 3 3 Relative Conductivity Measurements Relative conductivity measurements can be performed if you want to follow the change in conductivity with time for a given sample To perform relative conductivity measurements with the CDM230 you must select a Fixed or a Manual range in the Edit Method mode see page 7 3 You must also select the Reset reading Yes option in the Edit Method mode see page 7 4 Operating Instructions 1 Selection of the conductance range Before starting relative measurements you must find the conductance range measure the intial and final conductance of your sample conductiv ity divided by the cell constant value Example If the conductivity measured varies between 15 S cm and 135 S cm and
47. 54R01N001 3 APR 1998 09 09 CELL CALIBRATION Cell No 2 Cell Constant calibrated using Seawater Standard Conductance 39 2 mS Temperature 25 0 C Measurement Time 14 s Cell Constant value 1 2482 cm 1 A7 7 TDS TDS measurements of a NaCl solution using the CDC565 conductivity cell Programmation Edit METHOD Method B Cell No 2 Mode TDS Printout Format Result Warning Beep Yes Result Beep Yes Edit CALIBRATION Cell Cell 1 Constant Calibrate using 0 05 NaCl Stability Criterion 1 0 min Accept Time 60 s Calibrate every 7 days Cable resistance 0 000 Cable Capacitance 400 pF Edit CALIBRATION Method Lock current Cal No TDS of standard 500 0 mg l Stability Criterion 1 0 min Accept Time 60 s Calibrate every 7 days Edit SAMPLE Sample result Autoread Stability Criterion 1 0 min Accept Time 60 s A7 8 Results Method calibration Sample measurements A7 9 Concentration Concentration measurements of a NaCl solution using the CDC565 conductivity cell Programmation Edit METHOD Method B Cell No 2 Mode Concentration Unit delection mg l Printout Format All Warning Beep Yes Result Beep Yes Edit CALIBRATION Cell Cell 1 Constant Calibrate using 0 05 NaCl Stability Criterion 1 0 min Accept Time 60 s Calibrate every 7 days Cable res
48. 850mS cm 51s 17 7 oC CONC COEFF B1 1 012E 03 STAB 0 850mS cm 51s 17 0 oC Adjust using and TEMP OF STANDARD 17 0 C If temperature sensor connected When stable or at end of Accept time or Cell calibration see chapter 2 If calibration using 2 points If calibration using 3 points Display the other coefficients if calculated using Display the other coefficients if calculated using DIP CELL IN STD2 5 000mg l DIP CELL IN STD3 10 00mg l CONC COEFF B1 1 012E 03 DIP CELL IN STD1 1 000mg l Concentration method cell and method calibrations Display Overview 6 15 GLP Table If the GLP key is pressed after having selected a Concentration method the 3 following options are available If Cell is selected calibration data can be accessed as explained on pages 2 18 and 2 19 If Sample is selected sample measurement data can be accessed as explained on pages 2 20 to 2 22 If Method is selected the Concentration method calibration data can be accessed as explained below Method Calibration Data For a Concentration method when Method is selected the following method calibration data can be accessed Press to see the most recent meth od calibration data i e entry no 1 The first display shows the first concentration coeffi cient found B0 for method B If a 1 point calibration has been performed the display shows indicating that this coefficient
49. 9 GLP Table Method Calibration 5 12 Concentration Measurements 6 1 Selecting a Concentration Method 6 1 Editing the Method parameters 6 2 Editing the Calibration Cell parameters 6 3 Editing the Calibration Method parameters 6 4 Editing the Sample parameters 6 7 Performing a cell Calibration 6 8 Performing a Method Calibration 6 9 Performing Concentration Sample measurements 6 13 GLP Table Method Calibration 6 15 The Edit Mode 7 1 Editing a Method 7 1 Methods and Conductivity Cells 7 2 Edit Method 7 3 Edit Calibration Cell Calibration 7 6 Edit Calibration TDS Method
50. 99 C Available for conductivi ty resistivity and concentration methods Natural water correction automatic temperature correction of the conductivity from the sample temperature to 25 C Available for con ductivity resistivity and concentration methods Cable corrections Cable resistance 0 to 1 999 Cable capacitance 0 to 1999 pF Data storage 3 methods each with parameters for sample measurements and cali bration procedures GLP Functions Complete printout with date time instrument ID and if selected cali bration data Access to the last 5 calibrations for each cell the last 5 calibrations for each method and the last 50 sample measurements A6 4 Finish Splashproof cabinet with 2 x 16 character alphanumeric LCD display Languages English French German Spanish or Italian Outputs inputs RS232C I O for connection of Printer PC and VIT90 Video Titrator 9 pin D connector 2400 or 9600 baud Direct analogue recorder output 2000 mV full scale for all conductance ranges except for the 2 S range 1000 mV full scale Calibrated analogue recorder output for conductivity measurements only 0 25 mV correspond to 2 digits of the CDM230 display Maximum poten tial output 1000 mV Input for conductivity cell and temperature sensor Power supply for SAM7 Sample Stand or SAM90 Sample Station Ambient Temperature 5 to 40 C Relative Humidity 20 to 80 Power requirements
51. Andrew D Eaton part 1030F page 1 12 7 International Electrochemical Commission Draft January 1980 Sub Committee 66 WG2 and G F Hewit Chemical Engineering Division U K A E A Resezarch Group Atomic Energy Research Establishment Harwell October 1960 9 1 Printouts This chapter gives an explanation of the printouts available when a printer is connected to the CDM230 Printout layout is described and illustrated and information is provided about the type of data printed and when it is printed Specific information can be found on the following pages and in the order shown concerning Calibration results Sample results Method table Edit data GLP data How to obtain printouts Calibration and sample measurement results are printed automatically when a printer is connected Printouts are obtained by pressing the Print key during a calibration a sample measurement or when the method selection screen is displayed Printouts can also be obtained by pressing the Print key in all Edit modes 9 2 Cell Calibration Results The Print key can be pressed during a calibration The live display will be printed out for example The following information is automatically printed out at the end of a cell calibration the instrument ID entered in Edit Print the date and time the cell number the type of calibration performed and the conductivity measured the sample temperature or th
52. B CELL2 CONCENTRATION Cal 6 10 The next screen depending on the selection you made in Edit Cell Calibration see page 6 3 Press the left or right arrow keys If you press the key by mistake press the up arrow key The next screen must be CONC COEFF METHOD B Press the key The next display depends on the options selected in the Edit Method Calibration mode see page 6 4 If Lock current Cal Yes has been selected in Edit Calibration mode The 1 to 3 coeffi cients entered in the Edit Calibration mode are displayed Use the left or right arrow keys to display the other coefficients if saved in the method Coefficient Bi means that the coefficient of index i 0 to 2 is related to method B You can start sample measurements using the current method If Lock current Cal No has been selected The coefficient s is are going to be deter mined by a calibration using 1 to 3 standard s of known concentration Pour standard 1 into the beaker Dip the conductivity cell and temperature sensor if desired in standard 1 for example 1 000 mg l Start stirring Check that the conductivity cell is properly immersed in the solution and that proper stirring is applied The SAM7 Sample Stand which is a combined electrode holder and magnetic stirrer is ideal for setups with the CDM230 CONC COEFF METHOD B CELL 2 CONST 1 000cm 1 CELL 2 CONST CALIBRATION or CELL 2 CONST 1 000 c
53. Conductivity Meter 654R01N001 4 DEC 95 10 12 GLP TDS CALIBRATION Method A GLP TDS Cell Standard Value Temp Time Date No factor No mg l measured C h min 1 0 576 1 501 1 0 870mS cm 25 0 09 37 04DEC95 2 0 574 1 501 1 0 872mS cm 25 0 10 02 31NOV95 3 0 574 1 501 1 0 872mS cm 25 0 11 31 24NOV95 9 11 GLP Sample data 1 Press the GLP key 2 Select Sample with the left or right arrow keys 3 Press the Print key The GLP table is printed The table can contain up to 50 sample results for all methods The last result obtained is printed on the first line GLP n 1 and the oldest result is printed on the last line of the table If an error occurred during the measurement an error number will be shown in the table and the corresponding message will be printed below Note PWC means Pure Water Correction CDM230 Conductivity Meter 654R01N001 4 DEC 95 10 12 GLP SAMPLE Method A Mode Conductivity GLP Range Smp Cell Offset Result Er Meas Temp Tref PWC Time Date No No No ror min s C C h min 1 40mS 17 1 11 12 00 24 25 0 25 No 03 38 04DEC95 mS cm 2 4mS 16 1 0 023 2 00 12 25 0 25 No 03 32 04DEC95 mS cm 3 40mS 15 1 1 00 40 25 0 25 No 03 29 04DEC95 4 40mS 14 1 1 00 20 25 0 25 No 03 26 04DEC95 5 40mS 13 1 12 51 00 21 25 0 25 No 03 23 04DEC95 mS cm 6 40mS 12 1 10 01 2 00 22 25 0 25 No 03 20 04DEC95 mS cm Err
54. DC641T CDC741T CDC749 CDC565 CDC865 CL136 CL336 cell or cable Capacitance 500 320 170 440 440 70 200 in pF See also chapter 8 Theory After having entered the Cable Capacitance press the up arrow key or leave the Edit Calibration mode by pressing the Method Sample Cal or Tref key 7 10 Edit Calibration TDS Method The calibration of a TDS method is edited as follows Using Select the TDS method A B or C you want to calibrate If the method is not TDS or the method does not use the correct cell hold the Method key down for 3 seconds and select a TDS method and or the correct cell See also page 7 3 Press the Cal key for 3 seconds to enter the Edit Calibration mode Using Select whether you want to edit a calibration procedure for the cell selected Cell 1 in our example or to edit a method calibration Select Edit Cell 1 Cal then press the down arrow key if you want to edit the calibration procedure A cell calibration of a TDS method is carried out in the same way as for a Con ductivity method see pages 7 6 to 7 9 To edit a method calibration select Edit Method Cal then press the down arrow key If you choose Edit Method Cal before If you want the method calibration results TDS Factor to be locked select Lock current Cal Yes using In this case the TDS Factor is entered in the Edit mode on the next display In routine mode if you press the Cal key then select the TDS
55. ECTION NO 7 20 Edit Sample MANUAL Measurements In this mode a live measurement reading with a sliding stability indicator using 1 min is displayed You accept the result when stable by pressing the key Using Select the method of which you want to edit the sample parameters Press the Sample key for 3 seconds to enter the Edit Sample mode Select BY PRESSING using Using Select Yes if you want to subtract the conduc tivity of pure water from the measured conduc tivity The pure water correction takes the sample temperature into account see chapter 8 Theory Note the pure water correction is not available for a Salinity a TDS or a Concentration method The pure water correction is not available if Temp correction None has been selected in Edit Tref Press the up arrow key or leave the Edit Sample mode by pressing the Method Sample Cal or Tref key METHOD A CELL1 CONDUCTIVITY SAMPLE RESULT BY PRESSING PURE WATER CORRECTION YES PURE WATER CORRECTION NO Sample 3 seconds 7 21 Edit Tref Temperature Correction Sample measurements of a Conductivity Resistivity or Concentration method may be corrected to a reference temperature using a linear equation select Temp correction Enter below Use this option if you want to correct the sample measurements to a reference temperature of your choice between 0 and 99 C See chapter 8 Theory a non linear eq
56. Method 2 2 Cell Calibration 2 4 Sample Measurements 2 11 GLP Table 2 17 Conductivity Measurements 3 1 Selecting the Conductance Range 3 1 Relative Conductivity Measurements 3 3 Salinity Measurements 4 1 TDS Measurements 5 1 Selecting a TDS Method 5 1 Editing the Method parameters 5 2 Editing the Calibration Cell parameters 5 3 Editing the Calibration Method parameters 5 4 Editing the Sample parameters 5 6 Performing a cell Calibration 5 7 Performing a Method Calibration 5 8 Performing TDS Sample measurements 5
57. NEW CELL CAL REQUIRED NEW METHOD CAL REQUIRED 2 13 You can enter a new sample number 1 to 9999 using the left or right arrow keys If no key is pressed the CDM230 switches automatically to the next display 4 If no temperature sensor is connected and for a Conductivity a Resistivity or a Concentration method if a temperature correction has been selected in Edit Tref mode The temperature must be adjusted manually using the left or right arrow keys Press key to continue Note If a temperature sensor is connected the temperature will be measured directly and the SAMPLE TEMP display will not appear 5 The measurement starts and can be followed on the display by means of the conductivity or resistivity reading and the visual STABility indicator If a temperature sensor is connected If no temperature sensor is con nected and 23 2 C was entered in step 4 When the visual STABility indicator shows STAB the measured stability is better than 1 min for MANUAL measurements or better than the Stability criterion entered in the Edit Sample mode for AUTOREAD or AT INTERVALS measurements The letters S ST STA appear as stabilisation progresses For MANUAL measurements the CDM230 displays the time elapsed since measurements started For AUTOREAD measurements the Accept time i e maximum time of a measurement entered in the Edit Sample mode is counted down The CDM230 displays the time elapsed
58. Operating Instructions CDM230 Conductivity Meter D21M009 Introduction The CDM230 Conductivity Meter is a top of the line instrument in MeterLabTM RADIOMETER ANALYTICAL s complete range of measuring equipment for accurate and reliable pH ion and conductivity measure ments The CDM230 offers high precision measurements conductivity measure ments in the range 0 001 S cm to 2 000 S cm resistivity measurements in the range 0 2 cm to 500 M cm salinity measurements TDS meas urements and concentration measurements Three measurement methods for conductivity resistivity salinity TDS or concentration can be individually edited to fit your specific tasks Calibration data for 3 different cells can be stored Using the AUTOREAD function the result is locked on the display as soon as the user defined stability criterion and or the accept time are reached thus ensuring excellent reproducibility Sample measurements can also be measured continuously and printed out at specific time intervals Conductivity is displayed at the sample temperature or can be corrected to a reference temperature between 0 and 99 C using a temperature coefficient If your sample is natural water the conductivity can also be corrected to a temperature of 25 C using a standardized conversion algorithm The conversion factor is calculated from a conductivity versus temperature table stored in the memory Sample temperature can be measured auto
59. PC CELL TEMP RECORDER MADE IN FRANCE RADIOMETER ANALYTICAL S A 12 V 0 3 A OFF 12 V 0 8 A POWER OUT POWER ON POWER IN LI BATTERY 3 6V SIZE AA R6 Setting up The CDM230 Conductivity Meter 1 Place the CDM230 on a laboratory bench close to an appropriate power outlet 2 Raise the conductivity meter by means of the blue tilt up levers if desired 3 Connect the CDM230 to the mains supply via the POWER IN 12 V 0 8 A socket using the AC DC adapter supplied For safety reasons make sure that the power adapter is placed at a distance of at least 1 meter from a water supply Fig 1 Rear panel of the CDM230 4 The CDM230 can be switched ON OFF using the POWER ON OFF switch situated on the rear panel see fig 1 5 A printer or a PC can be connected to the CDM230 via the RS232C PRINTER PC interface For printer connection use the RADIOMETER ANALYTICAL cable 9 25 pins part no A95P201 For PC connection please refer to appendix 2 6 To connect a recorder use the CDM230 analogue RECORDER output and the MAB 8M 3 banana RADIOMETER ANALYTICAL cable part no A95R102 For pin connections of the RECORDER socket please see appendix 2 7 If the SAM7 Sample Stand is to be connected use the CDM230 POWER OUT output and the RADIOMETER ANALYTICAL cable part no A95A110 1 2 The socket This non insulated socket is connected to the electrical zero of the CDM230 When the CDM230 is used with other measurement
60. a Concentration method This chapter also includes a description of how to display the GLP data cell calibration and sample data To display the GLP method calibration data please refer to chapter 5 TDS method or 6 Concentration method To print the GLP data please refer to chapter 9 If you are about to use the CDM230 for the first time please read chapter 1 Setting up before reading this chapter For first time users it is recom mended to follow the instructions of this chapter in the order in which they are given In this chapter you will find parameters printed in bold and italics exam ple Cell Constant Enter below these parameters are defined in the EDIT Mode as described in chapter 7 2 2 Selecting the Method Refer to the display overview given on the next page 1 Switch on the CDM230 with the on off switch The first display you see will remain for a few seconds and shows the name of the meter the software reference and that the CDM230 is performing an Autotest 2 The language selection display appears for a few seconds Then the CDM230 automatically switches to the method selection display 3 Select a method A B or C using the left and right arrow keys The Conductivity cell Cell 1 Cell 2 or Cell 3 used with the method is displayed The second line of the display indicates whether it is a conductivity resistivity salinity TDS or concentration measure ment method Select the method havin
61. alculated when the measurement is stable set the Accept time to with the left or right arrow keys Range available 1 to 9999 seconds and Note At the end of the calibration the TDS Factor is calculated and displayed as soon as either the Stability criterion or the Accept time is reached If the Stability criterion and Accept time are both set to the measurement must be accepted manually by pressing the key Using Adjust the maximum time interval between two method calibrations The CDM230 prompts you to perform a new method calibration if the current calibration is older than for example 7 days Range available 1 to 999 days STABILITY CRIT 1 0 min ACCEPT TIME 60 s CALIBRATE EVERY 7 DAY S 5 6 B4 Editing the Sample parameters Using Select the TDS method B for example you want to edit the Sample parameters If there is no TDS method or if the TDS method does not use the correct conductivity cell Cell 2 for example hold the Method key down for 3 seconds and select a TDS method and or the correct cell See also page 5 2 Editing the Method parameters Press the Sample key for 3 seconds to enter the Edit Sample mode Using Select the measurement mode between Autoread At intervals By pressing The AUTOREAD function locks the result on the display as soon as the signal is stable Stability is defined by the Stability criterion and Accept time set in the Edi
62. alibration performed is older than the Calibrate every parameter entered during Edit Calibration mode Press the Cal key to start a calibration 10 2 PRINTER ERROR If a printer is connected and data transmis sion cannot be performed properly this message will appear Check that the printer is on line and that the paper is in place SAME STANDARD During calibration of a concentration CHANGE STANDARD method the conductivity measured in a standard and the next one differ by less than 0 5 Calibration using the correct second standard can be initiated after pressing TEMP CHANGED During calibration of a concentration REPEAT MEAS method the temperature difference between two standards is more than 1 C The standards used for calibration must be at the same temperature use a thermo statted bath If the temperature is entered manually make sure you enter the same temperature for your standards while performing the method calibration TEMP CORRECTION During cell calibration if one of the five NOT POSSIBLE Calibrate using options is used and the calibration temperature measured or en tered is above or below the CDM230 specifications for the standard selected see page 7 6 Modify the calibration temperature and press the or Cal key to start a calibration TEMP CORRECTION During measurements this message is NOT POSSIBLE displayed if a temperature correction is selected and the sample temperature is
63. and if method B has been edited as a 2 point calibration the CDM230 calculates the two concentration coefficients B0 and B1 The CDM230 displays the first coefficient B0 You can also display the other coeffi cient B1 by using the left or right arrow keys The 2 coefficients are stored in the GLP memory for the current method After stabilisation the 4 segments of the STAB indicator are continuously displayed and if method B has been edited as a 3 point calibration rinse the cell thoroughly with deionised water and dab dry with a soft tissue Dip the cell in standard 3 and press to continue After stabilisation the CDM230 calculates the three concentration coefficients B0 B1 and B2 The CDM230 displays B2 You can also display the other two coefficients B0 and B1 by using the left or right arrow keys The 3 coefficients are stored in the GLP memory for the current method The calibration is completed You can for exam ple start a sample measurement by pressing the Sample key CONC COEFF B0 3 395E 04 DIP CELL IN STD3 100 0mg l If 2 point calibration If 3 point calibration CONC COEFF B2 1 326E 06 6 13 E Performing Concentration sample Measurements Using Select the Concentration method with the correct cell method B with Cell 2 for example and press the Sample key If there is no Concentra tion method or if the Concentration method does not use the correct conductivity cell Cell
64. and the Temp of standard display will not appear The measurement can be followed on the display by means of the conductance reading and the visual STABility indicator If the temperature is measured If no temperature sensor is con nected and 23 0 C has been entered After a set time the measurement will be accepted whether it is stable or not The display shows this countdown in seconds Note The maximum duration of a measurement is defined in the Edit Calibration mode Accept time parameter If the method has been edited with no Accept time the CDM230 displays the time since the measurement started The measurement variations are compared to a stability criterion When the 4 segments of the STAB indicator are continuously dis played it means that the measurement variations are less than the stability criterion the stabilisation is reached ST 111 7mS 44s 23 0oC ST 111 7mS 44s 23 0oC TEMP OF STANDARD 25 0 C 2 9 Note The Stability criterion is defined in Edit Calibration mode After stabilisation or at end of the maximum duration the CDM230 calculates the standard conductivity at the measured or entered temperature then calculates and displays the Cell constant The cell constant is stored in the GLP memory with the cell selected Note If the method has been edited with no stability criterion and no Accept time you must press the key to manually determine when the measurement is to be used for
65. ant Enter below the cell constant is displayed and cannot be changed here There is no cell calibration to perform If you have entered Cell 2 Constant Entered enter the Cell constant value using the left and right arrow keys The cell calibration is over If you have entered one of the five Calibrate using option start the cell calibration by dipping the cell into the specified standard solution then follow the operating instructions of pages 2 5 to 2 9 Note We recommend you to use the 0 05 NaCl solution to calibrate the method The correct solution must have been selected in the Edit Cell Calibration parameter Calibrate using 0 05 NaCl see page 5 3 METHOD B CELL2 TDS DIP CELL 2 IN 0 05 NaCl Cal CELL 2 CONST 1 000cm 1 CELL 2 CONST CALIBRATION or If Cell 2 Const Calibration Or Dip Cell 2 in Standard 1 KCl 0 1 KCl 0 01 KCl Seawater Std CELL 2 CONST 1 000 cm 1 or 5 8 D Performing a Method calibration see also the display overview page 5 11 Using Select the TDS method with the correct cell method B with Cell 2 for example and press the Cal key If there is no TDS method or if the TDS method does not use the correct conductivity cell Cell 2 for example hold the Method key down for 3 seconds and select a TDS method and or the correct cell See also page 5 2 Editing the Method parameters The next screen depending on the selection you made in
66. calibration The calibration is completed You can for example start a sample meas urement by pressing the Sample key CELL 1 CONSTANT 1 008cm 1 2 10 CELL 1 CONSTANT 1 000 cm 1 DIP CELL 1 IN STANDARD Adjust using Cal CELL 1 CONSTANT 1 000 cm 1 If Cell constant Enter below If Cell constant Entered If Cell constant Adjusted STAB 12 39mS cm 0 9452 23 0oC STAB 12 39mS cm 0 9452 If no temperature sensor CELL 1 CONSTANT 0 9452 cm 1 Adjust using and DIP CELL 1 IN 1 KCl If Calibrate using STAB 95 88mS 51s 17 7oC CELL 1 CONSTANT 0 9452 cm 1 STAB 95 88mS 51s 17 0oC If no temperature sensor Adjust using and TEMP OF STANDARD 17 0 C If temperature sensor If temperature sensor When stable or at end of Accept time Calibration Display Overview 2 11 Sample Measurements Sample measurements can be performed in three ways depending on the option selected in the EDIT Sample mode Using the MANUAL by pressing validation function with a live reading on the display When you consider the measurement to be stable press the key Using the AUTOREAD function which locks the result on the display as soon as the signal is stable or at end of an Accept time Stability is defined by the Stability criterion and Accept time set in the Edit Sample mode Using the AT INTERVALS function for which the sample is measured continuously and pr
67. ccept time to with the left or right arrow keys Range available 1 to 9999 seconds and TDS FACTOR 0 574 TDS OF STANDARD 501 1 mg l STABILITY CRIT 1 0 min ACCEPT TIME 60 s 7 12 Note At the end of the calibration the TDS Factor is calculated and displayed as soon as either the Stability criterion or the Accept time is reached If the Stability criterion and Accept time are both set to the measurement must be accepted manually by pressing the key Using Adjust the maximum time interval between two method calibrations The CDM230 prompts you to perform a new method calibration if the current calibration is older than for example 7 days Range available 1 to 999 days After having entered this number of days press the up arrow key or leave the Edit Calibration mode by pressing the Method Sample Cal or Tref key CALIBRATE EVERY 7 DAY S 7 13 Edit Calibration Concentration Method A calibration of a Concentration method is edited as follows Using Select the Concentration method A B or C you want to calibrate If the method is not Concentration or the method does not use the correct cell hold the Method key down for 3 seconds and select a Concentration method and or the cell See also page 7 3 Press the Cal key for 3 seconds to enter the Edit Calibration mode Using Select whether you want to edit a calibration procedure for the cell selected Cel
68. ct No reset in step 3 the absolute conductivity measurement will be displayed 4 1 Salinity Measurements To perform Salinity measurements with the CDM230 follow the instructions of chapter 2 Routine Use select a Salinity method perform a cell calibra tion then start sample measurements Please observe the following recom mendation Use the CDC865 4 pole conductivity cell model with platinised plati num rings Calibrate the cell with a seawater standard solution salinity 35 with a conductivity of 42 896 mS cm at 15 C You can order this standard from Ocean Scientific International Brook Road Wormley Surrey GU8 5UB United Kingdom 5 1 TDS Measurements To perform TDS measurements with the CDM230 A Select a TDS method B Edit the TDS method i e B1 Edit the Method parameters B2 Edit the Calibration cell parameters B3 Edit the Calibration method parameters B4 Edit the Sample parameters C Calibrate the cell i e determine the cell constant of the conductivity cell D Calibrate the method i e determine the TDS factor of the method E Perform TDS measurements on your samples A Selecting a TDS method 1 Switch on the CDM230 with the on off switch then select the language if necessary See page 2 2 for more information 2 The CDM230 automatically switches to the method selection display Select a TDS method A B or C having the right cell Cell 1 Cell 2 or Cell
69. d Range C 1 M 0 1 M 0 01 M NaCl 15 25 1 735 1 863 1 882 1 981 15 25 35 1 730 1 906 1 937 2 041 15 27 15 34 25 35 1 730 1 978 1 997 2 101 25 27 25 34 Temperature range C Table 6 Average temperature coefficients of standard elec trolyte solutions expressed as C of the resistivity value at 25 C Temperature KCl KCl KCl Range C 1 M 0 1 M 0 01 M 15 25 2 09 2 30 2 33 15 25 35 2 02 1 92 1 98 15 27 15 34 25 35 1 63 1 69 25 34 Temperature range C A1 10 Table 7 Conductivity in S cm and resistivity in cm values of a 0 05 NaCl solution Temp Conductivity Resistivity C 0 540 40 1850 47 1 557 73 1792 97 2 575 20 1738 54 3 592 79 1686 93 4 610 53 1637 93 5 628 40 1591 35 6 646 40 1547 02 7 664 55 1504 78 8 682 83 1464 48 9 701 26 1426 01 10 719 82 1389 23 11 738 53 1354 05 12 757 37 1320 36 13 776 36 1288 07 14 795 48 1257 11 15 814 74 1227 38 16 834 14 1198 83 17 853 68 1171 39 18 873 36 1145 00 19 893 18 1119 60 20 913 13 1095 13 21 933 22 1071 56 22 953 44 1048 83 23 973 80 1026 91 24 994 28 1005 75 25 1014 90 985 31 26 1035 65 965 57 A1 11 Table 7 Continued Temp Conductivity Resistivity C 27 1056 53 946 49 28 1077 54 928 04 29 1
70. d selection of the conductivity cell selection of the type of method conductivity resistivity salinity TDS or concentration measurement ranges units etc When the Tref key is pressed the display shows if a temperature correction has been selected for the method and shows the reference temperature and temperature coefficient By holding the key down for 3 seconds you can select another temperature correction and enter the refer ence temperature and temperature coefficient The Cal key is pressed to initiate a cell or a method calibra tion By holding the key down for 3 seconds you can edit a cell or a method calibration procedure The Sample key is pressed to initiate sample measure ments By holding the key down for 3 seconds you can edit a sample measurement procedure The or Check Mark key is used to validate a display and thus continue to the next step In the MANUAL mode results are accepted by pressing this key The left and right arrow keys are used to change a number or to select an option which appears within arrows on the display In order to change parameter data quickly hold the left or right arrow key down continuously The up and down arrow keys are primarily used to move up and down in the Edit mode displays Method Tref Cal Sample 1 7 Print The Print key can be pressed during a calibration measure ment procedure Results of sample measurements and calibrations are printed automat
71. d on conductivity measurements offers a quicker and easier way of determining TDS than the Standard method filtration evaporation weighing procedure The TDS Factor calculated by the CDM230 also provides information about the qualitative ionic composition of the water sample If the TDS Factor is out of the 0 55 to 0 7 range the TDS calibration should be considered as suspect and must be repeated If a TDS Factor below 0 55 is confirmed the sample probably contains a significant concentration of a constituent that cannot be measured e g ammonia or nitrite A TDS Factor above 0 8 may indicate the presence of a large amount of poorly dissociated calcium and sulfate ions To determine the TDS of the sample the CDM230 performs steps 1 2 3 and 8 given on page 8 1 Step 8 is described in detail below Note There is no Edit Tref mode for a TDS method 8 10 Determination of the TDS Factor Method calibration A calibration using one standard of known TDS TDS STD is performed and the CDM230 calculates the TDS Factor as follows TDS factor TDS STD 18 STD TDS STD is expressed in mg l 18 STD is the conductivity of the standard corrected to 18 C in S cm The conductivity of the standard measured is corrected to 18 C by using the temperature correction table of a 0 05 NaCl solution The correction table originates from reference 7 see page 8 14 For normal water the TDS factor calculated should be with
72. e available If Cell is selected cell calibration data can be accessed as explained on pages 2 18 and 2 19 If Sample is selected sample measurement data can be accessed as explained on pages 2 20 to 2 22 If Method is selected the TDS method calibration data can be accessed as explained below Method Calibration Data For a TDS method when Method is selected the following method calibration data can be accessed Press to see the most recent method calibration data i e entry no 1 The first display shows the TDS Factor calculated in the last calibra tion If a is displayed it shows that you have changed one of the Accept time and Stability criterion parameters after you have obtained the result Press The TDS of the stand ard used for calibration is now dis played in mg L 5 13 Press The next display shows the conductivity measured and corrected to 18 C for the standard This value is used for the TDS Factor calculation Press If the measurement was unstable at the end of the Accept time Press The next display shows the temperature entered or measured of the standard Press one last time The date and time at which the method calibration was performed are now shown If you wish to see previous method calibration results press the down arrow key and then use the left or rght arrow keys to move along the text line The most recent calibration result is always shown first and is stored as
73. e cell con stant value if Cell constant Adjusted has been selected in Edit Calibration the conductance measured the sample temperature the measure ment time and the cell constant calculated if Calibrate using KCl NaCl or Seawater standard has been selected in Edit Calibration Examples Note If the cell constant calculated is out of the range 0 050 to 15 cm 1 the Out of range error message will appear If the measurement signal has not stabilised at end of the Accept time entered in Edit Calibration the Unsta ble error message will be printed with the cell constant value STAB 117 2mS 56s 22 4 C CDM230 Conductivity Meter 654R01N001 15 NOV 1995 09 48 CELL CALIBRATION Cell No 1 Cell Constant adjusted to calibration standard Conductivity 111 7 mS cm Cell Constant value 1 008 cm 1 CDM230 Conductivity Meter 654R01N001 16 NOV 1995 11 18 CELL CALIBRATION Cell No 1 Cell Constant calibrated using 1 KCl Conductance 111 7 mS Temperature 22 4 C Measurement Time 23 s Cell Constant value 1 008 cm 1 9 3 Method Calibration Results 1 TDS method The following information is automatically printed at the end of a TDS method calibration the instrument ID entered in Edit Print the date and time the method name A B or C the cell number
74. e is replaced by if the measurement was performed without the Reset reading option Press The next display shows the sample result conductivity result for example obtained If a is displayed it shows that you have changed one of the following parameters after you have ob tained the result Cell number measure ment mode Autoread At Intervals or Manual Accept time and Stability criterion Press The next display shows the temperature entered or measured of the sample 1 CONDUCTIVITY 4 000 mS RANGE 1 SAMPLE NUMBER 4 1 OFFSET 0 040mS cm 1 RESULT 0 974mS cm 1 TEMPERATURE 25 0 C 2 21 Press The next display shows if the measurement obtained was stable or not display of the STABility indicator and shows the measuring time in min utes and seconds i e the stabilisation time the accept time or the time taken before the result was accepted manually by pressing the key Press The display shows the reference temperature the sample meas urement is corrected to If no tempera ture correction was performed the dis play shows For a Salinity method the display shows that salinity measurements are calculat ed from a standard solution of known conductivity at 15 C For a TDS method the display shows that TDS measurements are calculated from a conductivity corrected to 18 C Press The coefficient used for the temperature correction is now dis played If no te
75. e starting the measurements Press the Method key and select a method A B or C Pressing the Sample key will normally start the measurement However the following message may be displayed This message reminds you that you have to calibrate the conductivity cell regularly e g weekly Press the Cal key and start a cell calibration If a TDS or a Concentration method is used another message may be dis played This message reminds you that you may have to recalibrate the method regularly e g every 100 days Press the Cal key and start a TDS calibration see chapter 5 or a Concentration calibration see chapter 6 Important A reliable sample measurement requires the exact cell constant If TDS or Concentration measurements are to be performed the exact TDS factor or Concentration coefficient values are also required The maximum time interval between 2 cell or 2 method calibrations is a user defined parameter set in the Edit Calibration mode Operating instructions See also the display overview page 2 16 1 Pour the sample solution into a beaker 2 Dip the conductivity cell and temperature sensor if desired in the sample solution Start stirring Check that the conductivity cell is prop erly immersed in the solution and that proper stirring is applied 3 Press the Sample key The sample ID number is displayed for 3 seconds This number is incremented each time a sample measurement procedure is initiated
76. easurement Result units Conductivity S cm or S m Resistivity cm or m Salinity no unit TDS in mg L Concentration g L mg L g L g kg mg kg g kg ppm ppb mol L mmol L mol L mol kg mmol kg mol kg Stability criterion AUTOREAD measurements and cell calibration Adjustable range 0 to 99 9 of measuring value per minute Max accept time AUTOREAD measurements and cell calibration Adjustable available range 0 to 9999 s A6 3 Cell Calibration 3 cell constants can be entered or determined independently Range 0 050 and 15 000 cm 1 Adjustment of the cell constant against standard of your choice Automatic determination of the cell constant using standards of which conductivity values against temperature are stored 1 D KCl temperature range 0 to 27 C 0 1 D KCl temperature range 0 to 50 C 0 01 D KCl temperature range 0 to 50 C 0 05 NaCl temperature range 0 to 99 C Seawater standard temperature range 2 to 35 C Method Calibration TDS method calibration The TDS Factor can be entered range 0 010 to 9 999 or determined using a standard of known TDS Concentration method calibration Automatic determination of the concentration coefficients by performing a calibration using 1 to 3 standards of known concentration Temperature correction Linear correction by entering a reference temperature 0 to 99 C and a temperature coefficient 0 00 to 9
77. econds 7 7 If Cell constant Enter below adjust the cell constant value using The next display is Cable resistance see page 7 8 Range available 0 0500 to 15 000 cm 1 by steps of 0 0001 below 10 cm 1 and of 0 001 above If you choose one of the five Calibrate using options adjust the Stability criterion using The stability criterion set in this display will deter mine when the electrode signal is accepted as being stable In our example when the drift is less than 1 0 of the measured value per minute the cell constant will be calculated and displayed If the Stability criterion is set to using the left or right arrow keys the cell constant will be calculated at the end of the Accept time set on the next display Range available 0 1 to 99 9 min and no criterion If you choose one of the five Calibrate using options adjust the Accept time using In the example shown the cell constant will be calculated after 60 seconds irrespective of the measurement stability If you only want the cell constant to be calculated when the measurement is stable set the Accept time to with the left or right arrow keys Range available 1 to 9999 seconds and Note at the end of the calibration the cell constant is calculated and displayed as soon as either the Stability criterion or the Accept time is reached If the Stability criterion and Accept time are both set to the
78. ected 2 or 3 standards continue to enter the concentration values in the same way The stability criterion set in this display will determine when the electrode signal is accepted as being stable In our example when the drift is less than 1 0 of the measured value per minute the result will be used for calculation of the concentration coefficients If the Stability criterion is set to using the left or right arrow keys the conductivity will be used for the calculation of the concentration coefficients at end of the Accept time set on the next display Range available 0 1 to 99 9 min and no criterion CALIBRATE USING 1 POINT S CONC STD 1 1 000 mg l If Lock current Cal No If Lock current Cal No STABILITY CRIT 1 0 min LOCK CURRENT CAL NO YES 7 15 Adjust the Accept time using In the example shown the conductivity value will be used for the calculation of the concentration coefficients after 60 seconds irrespective of the measurement stability If you only want the con centration coefficients to be calculated when the measurement is stable set the Accept time to with the left or right arrow keys Range available 1 to 9999 seconds and Note If the Stability criterion and Accept time are both set to the measurement must be accepted manually by pressing the key Using Adjust the maximum time interval between two method calibrations
79. eplace the result obtained with method C the following results will replace those obtained with method A from the oldest to the most recent Reset of the GLP table The only way to reset a GLP table is to switch off the CDM230 remove the battery see page 10 5 and the PC or printer cable if connected and switch the CDM230 on again Warning You will lose all the data stored in the GLP table for the 3 methods and you will reset to default values all the parameters of the 3 methods 1 DATE TIME 29NOV95 10 07 3 1 Conductivity Measurements To perform conductivity measurements with the CDM230 select a Conduc tivity method and follow the instructions given in chapter 2 Routine Use This chapter contains additional information which is specific to conductivity measurements i e manual selection of the conductance range relative conductivity measurements Selecting the Conductance Range 1 Perform steps 1 and 2 on page 2 2 2 Select a Conductivity method A B or C using the left and right arrow keys 3 Press the down arrow key the next display shows whether the CDM230 automatically changes the range according to the sample reading whether a specific range has been selected or whether you may specify a range The option depends on what is entered in the Edit Method displays Autorange Manual range or Fixed range Select a Conductivity method A B C CONDUCTIVITY AUTORANGE CONDUCTIVITY
80. er requirements 12 V 800 mA 1 5 6 9 3 6 A2 2 POWER OUT output 6 pin DIN socket for connection of the SAM7 Sample Stand cable part no A95A110 Pin connections 3 Electrical zero 6 12 V 300 mA max RECORDER output 8 pin DIN socket for connection of a recorder cable part no A95R102 The CDM230 has 2 types of analogue output signals Pin connections 1 Direct analogue output proportional to the conductance measured by the CDM230 2000 mV corresponds to the nominal value of the conductance range On the 2 S range 1000 mV corresponds to 2 S 2 Calibrated analogue output proportional to the conductivity displayed on the CDM230 2 digits on the displays i e the difference between the 2 displays 0000 and 0002 correspond to 0 25 mV Maximum potential output 1 V For resistivity measurements this pin outputs 0 V irrespective of the resistivity displayed 5 0 V Calibrated analogue output examples of potential output E between pins 2 and 5 when working on the 4 mS conducance range Displayed conductivity 2 000 mS cm E 250 mV Displayed conductivity 1 500 mS cm E 187 5 mV Displayed conductivity 4 000 mS cm E 500 mV Displayed conductivity 6 000 mS cm E 750 mV Displayed conductivity 7 998 mS cm E 999 75 mV Displayed conductivity 8 000 mS cm E 1 V Displayed conductivity 9 447 mS cm E 1 V Displayed conductivity 12 78 mS cm E 1 V 3 6 1
81. erature the type of measurement error if relevant the measurement duration and time Example for a Conductivity method Notes If Printout Format Result has been entered in Edit Method the two lines Last Cell Calibration and Cell constant value will not be printed For a TDS or a concentration method the two lines Last Method Calibration and TDS Factor or the lines Last Method Calibration and the 1 to 3 Coeffi cient lines will also not be printed The Out of range message will be printed out in the Error column if the meas urement is above or below the CDM230 specifications or if the measurement is above the conductance range selected The Unstable message will be printed out in the Error column if the measure ment signal has not stabilised at end of the Accept time entered in Edit Sample 9 6 2 For AT INTERVALS measurements the following information is automatically printed out at the end the measurement the instru ment ID entered in Edit Print the method name A B or C the cell number the date and time of the last cell calibration performed if Printout Format All the last cell calibration result if Printout Format All the date and time of the last method calibration per formed for a TDS or a Concentration method and if Printout Format All the last cell calibration result if Printout Format All and the last method calibration results for a TDS or a Concentration method and if Printout F
82. etermination of the Temperature Coefficient The temperature coefficient of a sample can be determined by measuring the conductivity resistivity of the sample at two different temperatures following the procedure described below Note For a temperature coefficient and a Concentration method follow the same operating instructions 1 Select a Conductivity method A B or C 2 Press Tref for 3 seconds and using the left or right arrow keys set the CDM230 to Temp correction None 3 Immerse the conductivity cell in a typical sample thermostatted to the desired reference temperature Tref Tref between 0 C and 99 C 4 Press the SAMPLE key 5 When stable write down the conductivity value measured at Tref 6 Heat or cool the sample to the desired measuring temperature T2 7 Press the SAMPLE key and read the conductivity of the sample at the measured temperature 8 Enter the conductivity measurements at Tref and T2 into the following equation and calculate the temperature coefficient measured at the reference temperature Tref 9 Press Tref for 3 seconds and using the left or right arrow keys set the CDM230 to Temp correction Enter below 10 Press the down arrow key and using the left or right arrow keys adjust the reference temperature Tref available values 0 to 99 C 11 Press the down arrow key and using the left or right arrow keys adjust the calculated temperature coefficient
83. example you want to calibrate the cell Cell 2 for example If the method is not Concentration or the method does not use the correct cell hold the Method key down for 3 seconds and select a Concentration method and or the correct cell See also page 6 2 Editing the Method parameters Press the Cal key for 3 seconds to enter the Edit Calibration mode Using Select Edit Cell 2 Cal then press the down arrow key METHOD B CELL2 CONCENTRATION EDIT CELL 2 CAL Cal 3 seconds CALIBRATE USING SEAWATER STD CELL 1 CONSTANT ADJUSTED CELL 1 CONSTANT ENTERED CELL 2 CONSTANT ENTER BELOW CALIBRATE USING 0 05 NaCl CALIBRATE USING 0 01 KCl CALIBRATE USING 0 1 KCl CALIBRATE USING 1 KCl CELL 2 CONSTANT or STABILITY CRIT ACCEPT TIME CALIBRATE EVERY CABLE RESISTANCE CABLE CAPACITANCE See pages 7 6 to 7 9 6 4 B3 Editing the Calibration Method parameters Using Select the Concentration method B for exam ple you want to calibrate If the method is not Concentration or the method does not use the correct conductivity cell Cell 2 for example hold the Method key down for 3 seconds and select a Concentration method and or the correct cell See also page 6 2 Editing the Method parameters Press the Cal key for 3 seconds to enter the Edit Calibration mode Using Select Edit Method Cal then press the down arrow key If you want the method calibration results Concentration coeffic
84. eys are pressed for a few seconds the CDM230 automatically switches to the method selection display Refer to the display overview given on page 2 3 Setting the Date Time and Keyboard Beep The CDM230 is fitted with an internal clock The actual date and time are adjusted in the Edit GLP mode The time and date are displayed when the CDM230 is switched on and appear in printouts 1 Switch on the CDM230 with the on off switch and wait for the Method selection display 2 Hold the GLP key down for 3 seconds The Current Time Hour display appears 3 The hour and minute can be adjusted in the two displays using the left or right arrow key Use the down arrow key to change the display CURRENT TIME HOURS 10 CURRENT TIME MINUTES 20 4 Adjust the year month and day in the following three displays using the left or right arrow key CURRENT DATE YEAR 95 CURRENT DATE MONTH APR CURRENT DATE DAY 26 1 4 5 If you press the down arrow key the Keyboard Beep display appears Using the left or right arrow key select whether you want a beep to sound at each keystroke Leave the Edit mode by pressing the Method Cal Sample or Tref key Selecting the Parameters of the CDM230 Printer Serial Port A printer can be used with the CDM230 The printer must be connected to the PRINTER PC output on the rear panel of the CDM230 and the serial parameters must be selected as follows 1 Hold the Print key d
85. f Temp correction None has been selected in Edit Tref Press the up arrow key or leave the Edit Sample mode by pressing the Method Sample Cal or Tref key PURE WATER CORRECTION YES PURE WATER CORRECTION NO STABILITY CRIT 1 0 min ACCEPT TIME 60 s 7 18 Edit Sample AT INTERVALS Measurements In this mode the sample is measured continuously and the measurement printed out at specific time intervals whether the signal is stable or not Using Select the method A B or C for which you want to edit the sample parameters Press the Sample key for 3 seconds to enter the Edit Sample mode Select AT INTERVALS using The Stability criterion set in this display will determine when the electrode signal is judged as being stable e g when the drift is less than 1 0 of the measured value per minute the result will be considered as stable If is selected using the left or right arrow keys the sliding stability indicator uses 1 min Range available 0 1 to 99 9 min and In the example shown the measurement will be printed at intervals of 60 seconds If the Stability criterion is not fulfilled at the end of the Print interval a warning message UN STABLE will be displayed Note A printout is made on starting the measurements if a Print interval greater than 10 seconds is selected Range available 4 to 9999 seconds METHOD A CELL1 CONDUCTIVITY STABILITY CRIT 1 0 min
86. f the standard 10 4 OUT OF RANGE This message appears if the TDS factor during TDS Calibration calculated is outside the 0 010 to 9 999 range Check the condition of the cell and con nection cell input Check the TDS of the standard During sample measurements figures will be replaced by signs if the number of figures obtained exceeds the number which can be shown on the CDM230 display Check the condition of the cell and con nection cell input Start a new sample measurement if the remains displayed start a cell calibration and a method calibration if using a TDS or Concentration method Immunity interference When using the Conductivity meter CDM230 in heavy industry a high level electromagnetic field gt 10 V m may impair the operation of the conductivity meter The situation is temporary operation will return to normal within a few seconds A1 1 Conductivity Resistivity Tables Table 1 Conductivity in mS cm of varying Demal concentra tions of 1 D 0 1 D and 0 01 D KCl solutions Temp KCl KCl KCl C 1 D 0 1 D 0 01 D 0 65 14 7 13 0 773 1 66 85 7 34 0 796 2 68 58 7 56 0 820 3 70 32 7 77 0 843 4 72 07 7 98 0 867 5 73 84 8 20 0 891 6 75 62 8 42 0 915 7 77 41 8 64 0 940 8 79 21 8 86 0 965 9 81 03 9 08 0 989 10 82 85 9 31 1 014 11 84 68 9 54 1 039 12 86 54 9 76 1 065 13 88 39 9 99 1 090
87. from the movement of every ion present The resistance between the electrodes is proportional to the ratio of the distance l between the electrodes and the surface area s of the electrodes This ratio is known as the cell constant Gm S 1 Rc Gs Gs K cm l s 1 8 3 The CDM230 calculates and displays the conductivity or the resistivity of a solution on the basis of the conductance G compensated for the cable resistance and capacitance and the cell constant of the conductivity cell used The conductivity and resistivity are calculated as follows G K S cm 1 cm 3 Pure Water Correction The conductivity of pure water can be subtracted from the conductivity measured if asked for in the Edit Sample mode select Pure Water correction Yes see chapter 7 Principle The CDM230 calculates the conductivity of pure water Cwater at the sample temperature T using a 4 degree polynomial equation The equation used fits the table stated in reference 1 see page 8 14 Conductivity of pure water is calculated for a temperature range of 0 to 100 C The CDM230 subtracts the Cwater from the conductivity measured in the sample and displays the difference The Pure Water Correction can be used each time you want to suctract the conductivity value of a pure water i e 0 055 S cm at 25 C This correction is interesting on very low conductivity samples when using the 4 S co
88. g 3 1 Current date 1 3 Current time 1 3 A8 2 D Date Setting the date 1 3 E Edit Calibration or Cell calibration 7 6 GLP 7 23 Method 7 3 Method calibration Concentration 6 4 7 13 Method calibration TDS 5 4 7 10 Print 7 24 Sample 7 16 Tref 7 21 G GLP tables Cell Calibration data 2 18 Method calibration data TDS 5 12 Method calibration data Concentration 6 15 Sample data 2 20 I Instrument ID 7 24 K KCl Demal solutions Definition 2 6 Preparation
89. g the right mode conductivity resistivity Salinity TDS or Concentration and right cell Cell 1 Cell 2 or Cell 3 Notes If there is no method programmed with the desired mode and desired cell enter the Edit Method mode and define the method mode and method cell as described in chapter 7 page 7 3 The current date and time can be displayed by pressing the up arrow key from the method display press the down arrow key to return to the method display If a Conductivity method is selected one more display is available by pressing the down arrow key the conductance range display Description on chapter 3 page 3 1 METHOD A CELL1 CONDUCTIVITY 2 3 Starting up Display Overview CDM230 AUTOTEST Language selected 3 seconds Power on 2 seconds Select the method A B C 28NOV95 14 16 05 METHOD A ENGLISH FRANCAIS DEUTSCH ESPANOL ITALIANO 28NOV95 14 15 33 Other modes are available Salinity and Concentration METHOD A CELL1 CONDUCTIVITY METHOD B CELL2 RESISTIVITY METHOD C CELL3 TDS 2 4 Cell Calibration The CDM230 measures conductance and displays conductivity or other measurement based on a conductivity resistivity salinity TDS or concen tration The conductivity is equal to the conductance multiplied by the cell constant see chapter 8 The cell constant is a characteristic of the conductivity cell used and must be known The aim of a cell calibration is
90. hapter 5 for the TDS method calibrationdata and chapter 6 for the Concentration calibration data If Sample is selected sample measurement data can be accessed press the down arrow key for Method B Notes When the GLP key is pressed followed by the Print key a summary of either calibration data or sample measurement results is printed out in table form refer to Printouts chapter 9 If there are no data stored in the GLP table cell calibration method calibration or sample data table the down arrow key is disabled METHOD B GLP SAMPLE METHOD B GLP CELL METHOD B GLP SAMPLE METHOD B GLP METHOD METHOD B GLP CELL 2 18 Cell Calibration Data When Cell is selected the following calibration data can be accessed Press to see the most recent calibration data i e entry no 1 The first display will show the cell constant found in the last calibration If a is displayed it shows that you have changed one of the following parameters after having per formed the calibration calibration mode Calibrate using Cell constant adjusted entered or Enter below Accept time and Stability criterion Press The type of standard used for the calibration is displayed 1 Demal KCl solution for example Press The conductance measured and used for calibration is displayed If the calibration mode selected was Cell con stant Adjusted the display shows a conductivity Press If the measure
91. has not been calculated If a is dis played it shows that you have changed one of the following parameters after you have obtained the result Accept time and Stability criterion 1 COEFFICIENT B0 1 041E 00 METHOD B GLP SAMPLE METHOD B GLP METHOD METHOD B GLP CELL 6 16 Press The next display shows the second concentration coefficient found B1 for method B A can also be displayed for the same reasons as for the previous display Press The next display shows the last concentration coefficient found B2 for method B If a 1 or 2 point cali bration has been performed the display shows indicating that this coeffi cient has not been calculated A can also be displayed for the same reasons as for the first coefficient display Press The display shows the concentration of the first standard and the unit the concentration is expressed in Press The next display shows the conductivity measured for the first stand ard Press If the measurement was unstable at the end of the Accept time Press The next display shows the temperature entered or measured of the first standard Press The display shows the concentration of the second standard and the unit the concentration is ex pressed in If a 1 point calibration was performed the displayed value is 1 COEFFICIENT B1 1 196E 01 1 COEFFICIENT B2 1 STANDARD 1 1 000mg l 1 STANDARD 1
92. he calculation of the concentration coefficients at end of the Accept time set on the next display Range available 0 1 to 99 9 min and no criterion CALIBRATE USING 1 POINT S CONC STD 1 1 000 mg l If Lock current Cal No If Lock current Cal No STABILITY CRIT 1 0 min 6 6 Adjust the Accept time using In the example shown the conductivity value will be used for the calculation of the concentration coefficients after 60 seconds irrespective of the measurement stability If you only want the con centration coefficients to be calculated when the measurement is stable set the Accept time to with the left or right arrow keys Range available 1 to 9999 seconds and Note If the Stability criterion and Accept time are both set to the measurement must be accepted manually by pressing the key Using Adjust the maximum time interval between two method calibrations The CDM230 prompts you to perform a new method calibration if the current calibration is older than for example 7 days Range available 1 to 999 days ACCEPT TIME 60 s CALIBRATE EVERY 7 DAY S 6 7 B4 Editing the Sample parameters Using Select the Concentration method B for example you want to edit the Sample parameters If there is no Concentration method or if the Con centration method does not use the correct con ductivity cell Cell 2 for example hold the Method key d
93. hod Sample Cal or Tref key PRINTER OUTPUT 2400 e 7 1 PRINTER OUTPUT 9600 n 8 1 Print INSTRUMENT ID 654R 001 N INSTRUMENT ID 654R001N 3 seconds 7 25 Locking the Edit Mode The parameters entered in all Edit Modes of all methods can be locked or unlocked from the method selection display as described below Press the up arrow key twice then Sample Method Sample or if CDM230 Edit Mode unlocked If CDM230 Edit Mode locked After 2 seconds Press the up arrow key METHOD A CELL1 CONDUCTIVITY DATA LOCKED 11DEC95 14 48 12 METHOD A DATA UNLOCKED METHOD A CELL1 CONDUCTIVITY 8 1 Theory Before a reading appears on the CDM230 display the following operations are performed in the following order 1 Conductance measurement Gm 2 Cable correction cable resistance and cable capacity correction corrected conductance value G 3 The cell constant is used to calculate the conductivity for all methods except the resistivity or the resistivity at the sample temperature measured or entered T 4 For a conductivity method only pure water correction new con ductivity at T 5 For a conductivity Resistivity and Concentration methods temperature correction conductivity at the reference temperature Tref 6 For a conductivity method offset optional operation relative conductivity at Tref 7 For a salinity method determination of the salinity of a seawater sam
94. hold the Sample key down for 3 seconds and follow the instructions on pages 7 16 to 7 20 6 Define a temperature correction for the sample measurement Edit the Tref data hold the Tref key down for 3 seconds and follow the instruc tions on pages 7 21 and 7 22 7 2 Methods and Conductivity Cells Three methods A B C can be edited independently using one to three con ductivity cells Cell 1 Cell 2 or Cell 3 As a general rule edit a new method when you need to use another conductiv ity cell for example method A with Cell 1 method B with Cell 2 method C with Cell 3 With the CDM230 it is also possible to run different methods for example methods A and B with the same conductivity cell for example Cell 1 Example you want to get a conductivity or a resistivity result for a sample using the same cell Cell 1 Follow the instructions below 1 Press the Method key and select Method A 2 Hold the Method key for 3 seconds and select the conductivity cell Cell 1 3 Press the Cal key to calibrate the cell result cell constant for Cell 1 k1 4 Press the Sample key and perform sample measurements with Cell 1 5 Press the Method key and select Method B 6 Hold the Method key down for 3 seconds and select Cell 1 7 Press the Sample key and perform sample measurements with Cell 1 the cell constant found in step 3 is used 7 3 Edit Method Select a method A B or C with
95. ically when a printer is connected Edit mode data and GLP result tables can also be printed out by pressing the Print key from the Edit mode or by pressing the Print key followed by the GLP key By holding the key down for 3 seconds you can select the parameters of the PC Printer port and identify your CDM230 entry of the ID number The GLP key gives access to the results of the last 5 cell calibrations if Cell is selected the last 5 method calibrations if Method is selected or the last 50 sample measurements if Sample is selected By holding the GLP key down for 3 seconds you can enter the current time and date and request a keyboard beep GLP 2 1 Routine Use This chapter describes how to perform measurements with the CDM230 in routine mode i e without entering the EDIT mode To perform measurements with the CDM230 the following steps must be performed in this order Selection of the method method name method mode Cell Calibration operations performed after pressing Cal for all methods Method Calibration operations performed after pressing Cal for a TDS or a Concentration method Sample measurements operations performed after pressing Sample The 3 steps apart from method calibration are described here The method calibration which is only required for TDS or Concentration methods is described in individual chapters These are Chapter 5 for a TDS method Chapter 6 for
96. ients to be locked select Lock current Cal Yes using In this case the concentration coefficients which are stored in the CDM230 memory are used for sample measurements In routine mode if you press the Cal key then select the Conc Coeff option the concentration coeffi cients will be displayed To determine the Concentration coefficients by performing a method calibration select Lock current Cal No then press the down arrow key If Lock current Cal Yes is entered you can press the up arrow key or leave the Edit Calibration mode by pressing the Method Sample Cal or Tref key METHOD B CELL2 CONCENTRATION EDIT METHOD CAL Cal 3 seconds LOCK CURRENT CAL NO YES 6 5 Using Select whether you want to perform a one two or three point calibration Using Adjust the concentration of the first standard Range available 0 000 to 9999 The unit displayed is the one selected in the Edit Method mode see page 6 2 If you have selected 2 or 3 standards continue to enter the concentration values in the same way The stability criterion set in this display will determine when the electrode signal is accepted as being stable In our example when the drift is less than 1 0 of the measured value per minute the result will be used for calculation of the concentration coefficients If the Stability criterion is set to using the left or right arrow keys the conductivity will be used for t
97. in 0 55 to 0 70 Calculating the sample TDS The sample conductivity is measured at the sample temperature 0 to 99 C and corrected to 18 C temperature correction as for the 0 05 NaCl The sample TDS TDS SMP is calculated from the sample con ductivity corrected at 18 C 18 SMP TDS SMP in mg l TDS factor 18 SMP TDS values between 4 and 20000 mg l can be displayed Note To obtain the most accurate measurements it is recommended to perform the standard and sample measurements at the same temperature 8 11 Concentration Measurements The concentration mode of the CDM230 can be used to determine the concentration of ionic species The concentration mode is not a selective method you can determinee a species in presence of other ionic or dissociated species provided that the concentration of the other species are negligeable or stay constant If the other species concentration remains constant it is necessary to add these species to each standard solution that will be used for the calibra tion Please also read the limitation of the concentration method on the next page To calculate a sample concentration the CDM230 must be calibrated against 1 to 3 standards of known concentration At the end of the method calibration a formula expressing the concentration as a function of the conductivity measured is determined The sample concentration is calculated from the sample conductivity measured and
98. inted out at specific time intervals set in the Edit Sample The measurements will stop at end of Stop print after set in the Edit sample mode The conductivity or resistivity of the sample is measured at the sample temperature then corrected to a reference temperature using a temperature coefficient if selected in the Edit Tref mode Another temperature correction the Natural water correction can also be performed if selected in the Edit Tref mode To determine the TDS of the sample the CDM230 first measures the con ductivity of the sample at the sample temperature then corrects the value to 18 C using the temperature correction of the 0 05 NaCl solution To determine the Concentration of the sample the CDM230 first measures the conductivity of the sample at the sample temperature then corrects the value to a reference temperature using a temperature coefficient if selected in the Edit Tref mode Another temperature correction the Natural water correction can also be performed if selected in the Edit Tref mode To determine the Salinity of the sample the CDM230 first measures the conductivity at the sample temperature and applies a conversion factor calculated from a conductivity versus temperature table for a standard solution of salinity 35 If a conductivity method is used a conductivity value can be subtracted from the conductivity measured Relative conductivity measurements are explained in chapter 3 page 3 3 2 12 Befor
99. ion The Demal concentrations have been established by G Jones and B C Bradshaw They are close to the number of moles per kg of total solution a Take or prepare carefully your standard solution Preparation of the standard solutions KCl Demal solutions For the 1 Demal KCl standard dissolve 71 1352 g of KCl in demineralised water to get 1000 g of solution For the 0 1 Demal KCl standard dissolve 7 41913 g of KCl in demineralised water to get 1000 g of solution For the 0 01 Demal KCl standard dissolve 0 745263 g of KCl in demineralised water to get 1000 g of solution The conductivity of the demineralised water used must not exceed 2 S cm Correction for air buoyancy must be applied to the weighing Reference for the preparation of the standards Organisation Internationale de M trologie L gale Recommendation no 56 June 1980 The CDM230 uses a 4 degree polynomial equation giving the conductivity as a function of temperature This equation fits the results of the National Insti tute of Standards and Technology NIST The results are published for the 0 1 and 0 01 KCl solutions in the Journal of Solution Chemistry Vol 20 no 4 1991 Other standard solutions For the 0 05 NaCl standard dissolve 500 mg of NaCl in demineralised water to get 1000 g of solution With this standard the measurements obtained with the CDM230 fit the tables published in October 1960 by G F Hewitt Atomic Energy Research Establish
100. istance 0 000 Cable Capacitance 400 pF Edit CALIBRATION Method Lock current Cal No Calibrate using 3 points Conc STD1 20 01 mg l Conc STD2 250 2 mg l Conc STD3 500 3 mg l Stability Criterion 1 0 min Accept Time 60 s Calibrate every 7 days Edit SAMPLE Sample result Autoread Stability Criterion 1 0 min Accept Time 60 s A7 10 CDM230 Conductivity Meter 654R01N001 5 APR 1998 15 18 CONCENTRATION CALIBRATION Method B Cell No 2 Cell Constant 1 2482 cm 1 Standard Concentration Temp Conductivity Meas No mg l C min s 1 20 01 22 0 51 8 S cm 00 33 2 250 2 22 0 0 593 mS cm 00 18 3 500 3 22 0 1 043 mS cm 00 15 Coefficient B0 2 057E 00 Coefficient B1 3 395E 01 Coefficient B2 1 326E 04 CDM230 Conductivity Meter 654R01N001 5 APR 1998 15 55 SAMPLE Method B Cell No 2 Mode Concentration Last Cell Calibration 3APR98 09 09 Cell Constant 1 2482 cm 1 Last Method Calibration 5APR98 15 18 Coefficient B0 2 057E 00 Coefficient B1 3 395E 01 Coefficient B2 1 326E 04 Sample Result Error Temp Meas Time No C mm ss hh mm ss 22 80 7mg l 22 0 00 15 15 56 49 Results Method calibration Sample measurements A8 1 Keyword Index A Accept Time
101. ivity Meter 654R01N001 16 NOV 1995 15 18 CONCENTRATION CALIBRATION Method A Cell No 1 Cell Constant 0 5288 cm 1 Standard Concentration Temp Conductivity Meas No mg l C min s 1 1 011 25 0 1 059 mS cm 00 21 2 1 022 25 0 0 881 mS cm 00 22 3 1 033 25 0 0 757 mS cm 00 20 Coefficient A0 1 157E 00 Coefficient A1 2 286E 04 Coefficient A2 8 584E 08 9 5 CDM230 Conductivity Meter 654R01N001 4 DEC 1995 09 48 SAMPLE Method B Cell No 1 Mode Conductivity Last Cell calibration 28NOV95 08 42 Cell Constant value 1 008 cm 1 Sample Result Error Temp Meas Time No C mm ss hh mm ss 6 102 2 mS cm 23 1 00 23 09 49 02 Sample Results 1 For AUTOREAD measurements the following information is auto matically printed out at the end the measurement the instrument ID entered in Edit Print the method name A B or C the cell number the date and time of the last cell calibration performed the date and time of the last method calibration performed for a TDS or a Concen tration method the last cell calibration result cell constant value and the last method calibration results for a TDS or a Concentration method A table is also printed out with the sample number the result the reference temperature used for temperature correction the sample temp
102. l water stated in reference 2 see page 8 14 The natural Water Correction can be selected for the following samples lake rivers underground waters For more information see Natural Water temperature correction ISO DIN 7888 Table 3 The available range for T is 0 to 35 9 C and the factor f25 T varies from 0 808 to 1 918 If the CDM230 measures a sample temperature T outside the range specified the message TEMP CORRECTION NOT POSSIBLE will be displayed and no result will be obtained 5 Relative conductivity A conductivity value of your choice can be subtracted from sample measurements if Reset reading yes is selected in the Edit Method mode see pages 3 3 and 7 4 The CDM230 then displays a relative conductivity Note A conductivity method and a fixed or manual conductivity range must be selected 8 7 Salinity Measurements Salinity is a measurement without unit corresponding to the weight of dissolved salts in seawater The CDM230 calculates the salinity from an empirical relationship between the conductivity and the salinity of a seawater sample The Salinity mode of the CDM230 follows Oceanographic Tables and Standards endorsed by UNESCO SCOR ICES IAPSO Determination of the sample salinity To determine the salinity of the sample the CDM230 performs steps 1 2 3 and 7 given on page 8 1 Step 7 is described in detail below Note There is no Edit Tref mode for a salinity method At the sa
103. l 1 in our example or to edit a method calibration Select Edit Cell 1 Cal then press the down arrow key if you want to edit the calibration procedure A cell calibration of a Concentration method is carried out in the same way as for a Conductivity method see pages 7 6 to 7 9 To edit a method calibration select Edit Method Cal then press the down arrow key If you choose Edit Method Cal before If you want the method calibration results Concentration coefficients to be locked select Lock current Cal Yes using In this case the concentration coefficients which are stored in the CDM230 memory are used for sample measurements In routine mode if you press the Cal key then select the Conc Coeff option the concentration coeffi cients will be displayed METHOD A CELL1 CONCENTRATION CELL 1 CONSTANT METHOD CAL EDIT CELL 1 CAL LOCK CURRENT CAL NO YES Cal 3 seconds 7 14 To determine the Concentration coefficients by performing a method calibration select Lock current Cal No If Lock current Cal Yes is entered you can press the up arrow key or leave the Edit Calibration mode by pressing the Method Sample Cal or Tref key Using Select whether you want to perform a one two or three point calibration Using Adjust the concentration of the first standard Range available 0 000 to 9999 The unit displayed is the one selected in the Edit Method mode see page 7 4 If you have sel
104. m 1 or CONC COEFF B1 1 196E 01 DIP CELL IN STD1 1 000mg l or 6 11 Press the key to continue If no temperature sensor is connected the temperature must be adjusted manually using the left or right arrow keys Press the key to continue Note If a temperature sensor is connected the temperature will be measured directly and the TEMP OF STANDARD display will not appear The measurement can be followed on the display by means of the conductivity reading and the visual STABility indicator After stabilisation the 4 segments of the STAB indicator are continuously displayed and if method B has been edited as a 1 point calibration the CDM230 calculates and displays the B0 concentration coefficient B0 is stored in the GLP memory for the current method The calibration is completed You can start a sample measurement by pressing the Sample key After stabilisation the 4 segments of the STAB indicator are continuously displayed and if method B has been edited as a 2 or a 3 point calibration rinse the cell thoroughly with deionised water and dab dry with a soft tissue Dip the cell in standard 2 and press to continue TEMP OF STANDARD 25 0 C DIP CELL IN STD1 1 000mg l CONC COEFF B0 1 196E 01 DIP CELL IN STD2 10 00mg l If 1 point calibration If 2 or 3 point calibration 6 12 After stabilisation the 4 segments of the STAB indicator are continuously displayed
105. m a NWC 7 21 P Print interval 7 18 Printer output 7 24 Printout format 7 5 Printouts Calibration results 9 2 Edit data 9 7 How to obtain printouts 9 1 GLP data 9 9 Method table 9 7 Sample results 9 5 Pure Water correction PWC Definition 8 3 How to program a PWC 7 17 A8 4 R Reference temperature 7 21 Reset reading 3 3 Resistivity resistance Theory 8 3 Resistivity method editing 7 3 Resistivity method running 2 11 Result beep 7 5
106. matically or entered manually The conductivity of pure water at the current temperature can be sub tracted automatically from the displayed conductivity Conductivity cells with 2 3 or 4 poles can be used The 4 pole conductiv ity cell provides reliable conductivity measurements to be performed over a wide conductivity range The CDM230 is equipped with a RS232C input output serial port allowing for measurements to be either printed out or processed using a PC equipped with MeterMaster the MeterLab Automation Program For optimal user convenience connect the SAM7 Sample Stand D21M009 Printed by Radiometer Analytical SAS France 2004 07I Contents Setting up 1 1 The CDM230 Conductivity Meter 1 1 Connecting the Conductivity Cell Temperature Sensor 1 2 Choosing the Language 1 3 Setting the Date Time and Keyboard Beep 1 3 Selecting the Parameters of the CDM230 Printer Serial Port 1 4 Entering the Instrument ID 1 5 Description of Keys 1 6 Routine Use 2 1 Selecting the
107. ment was unstable at the end of the Accept time Press The temperature measured or entered of the standard used for cali bration is displayed Press The date and time are shown 1 CONDUCTANCE 90 9mS 1 CELL 1 CONST 1 2248cm 1 1 STANDARD 1 KCl 1 CONDUCTANCE UNSTABLE 1 TEMPERATURE 25 0 C 1 DATE TIME 29NOV95 10 02 2 19 Press The cable resistance used for cable correction is displayed Press one last time The cable capacitance used for cable correction is displayed If you wish to see previous calibration results press the down arrow key and then use the left arrow key to move along the text line The most recent calibration result is always shown first and is stored as entry no 1 When the down arrow key is pressed the next result entry no 2 will appear 1 CABLE RESIST 0 261 1 CABLE CAPACIT 0pF 2 20 Sample Data When Sample is selected the following sample measurement results can be accessed Press to see the most recent sample result i e entry no 1 The first display will show the conductance range used for measurements The first line of the display indicates whether it is a Con ductivity a Resistivity a Salinity a TDS or a Concentration method Press The sample number is displayed Press If a Conductivity method is selected The offset value is the conduc tivity measured just before selection of the Reset reading option see page 3 3 The offset valu
108. mperature correction was performed the display shows If a Natural water correction was per formed Natural water is displayed For a Salinity or a TDS method a spe cific temperature coefficient is used the word TDS or SALINITY replaces the coefficient value Press The display shows which cell Cell 1 Cell 2 Cell 3 was used for the measurements 1 MEAS min s STAB 00 23 1 REF TEMP 25 C 1 TEMP COEF 2 21 C 1 CELL NUMBER 1 2 22 Press one last time The date and time at which the sample measurement was performed are now shown If you wish to see further sample measurement results press the down arrow key and then use the left arrow key to move along the text line Important The CDM230 can store up to a maximum of 50 results for all methods If you have 50 sample results stored in the GLP table and if you perform another measurement with method B for example the oldest of the 50 results present in the GLP table will be replaced by the new one irrespective of the method A B or C See below Method A 47 results obtained on the 21st of December 1995 Method C 1 result obtained on the 28th of November 1995 You are performing on the 22nd of December 1995 AT INTERVALS sample measurements with method B with the option Store in GLP All results then the first 2 results of method B are stored in the GLP table with no change for the 48 other stored results result no 3 will r
109. mple temperature T the conductivity of standard seawater T STD is calculated T STD f T 15 STD With 15 STD 42 896 mS cm at 15 C This value is stored in the CDM230 and cannot be modified It is the conductivity at 15 C of standard seawater of salinity 35 The conversion factor f T is calculated from a 4 degree polynomial formula The formula is stated in reference 3 see page 8 14 and UNESCO 1981 1983 The sample temperature T is measured or entered within the interval 2 to 35 C 8 8 At the sample temperature T the sample conductivity measured is T SMP Based on the ratio R T SMP T STD and the sample temperature T the formula stated in reference 4 see page 8 14 is applied The CDM230 displays the salinity S range 2 00 to 42 00 of the sample 8 9 TDS Measurements What is TDS and how it is measured The TDS Total Dissolved Solids corresponds to the total weight of cations anions and all other undissociated dissolved species in one liter of water sample A filtration evaporation weighing procedure is used as the standard method as described in reference 5 see page 8 14 The precision of the standard method is depending on the nature of the dissolved species The conductivity measured in the water sample is supposed to be proportional to the filtrable residue of the sample as mentioned in reference 6 see page 8 14 The TDS method of the CDM230 base
110. nductance range 4 Temperature correction The conductivity of a solution changes with temperature In order to compare measurements taken at different temperatures the conductivi ties are corrected using a temperature coefficient Two correction meth ods are available in the CDM230 Linear correction Natural water correction non linear correction 8 4 The Linear Correction The linear correction mode is selected in Edit Tref mode with the Temp correction Entered option see chapter 7 Principle The conductivities are corrected to a reference temperature using a temperature coefficient and the following equation Equation 1 Tref reference temperature in C T sample temperature in C Tref conductivity at Tref T conductivity at T temperature coefficient of the sample in C On the CDM230 the reference temperature is adjustable between 0 and 99 C by steps of 1 C and the temperature coefficient between 0 00 and 9 99 C by steps of 0 01 C Since the temperature correction factor should not be allowed to approach zero the limits for the sample temperature with respect to the reference temperature and vice versa depend upon the temperature coefficient and are as follows Temperature correction condition If this condition is not fulfilled the error message TEMP CORRECTION NOT POSSIBLE will be displayed and no result will be obtained ref T 100 100
111. on Press or Sample to start a new measurement Tr20 12 41mS cm UNSTABLE 23 1 oC Tr20 12 41mS cm UNSTABLE 23 1 oC If unstable Printout Sample 12 41mS cm RESULT Reference temperature if 20 C Reference temperature if 20 C Tr20 12 41mS cm RESULT 23 1 oC Tr20 12 41mS cm RESULT 23 1 oC When stable or after having pressed the key for MANUAL measurements Printout 2 17 GLP Table The data stored in the GLP table can comprise the results of the last 5 calibrations for each cell the last 5 method calibration for each TDS or concentration method and the last 50 sample measurements for the 3 meth ods in total The data are accessed in the following way 1 Press the Method key and select a method e g method B using the left or right arrow keys 2 Press the GLP key or Depending on the method mode 2 or 3 options are available use the left or right arrow key to make a selection If a Conductivity Resistivity or Salinity method has been selected 2 options are available Cell and Sample If a TDS or a Concentration method has been selected 3 options are available Cell Method and Sample If Cell is selected calibration data can be accessed press the down arrow key for the cell used with method B If Method is selected the method calibration data can be accessed press the down arrow key for the TDS or the Concentration method selected method B Please see c
112. or 1 Out of range Error 2 Unstable 10 1 Troubleshooting and Maintenance A number of tests are automatically performed when the CDM230 is switched on during calibration and during measurement If a problem is detected an error or warning message will appear on the display The messages are listed below By pressing the key the CDM230 will normally return to the operational state in which the error was detected This makes it possible to correct the error and immediately resume operation Error and Warning Messages Message Problem Action BATTERY LOW The battery is run down and must be replaced as described on page 10 5 Replace the battery and press the key MEMORY ERROR This message is displayed at power on if DATA MEMORY the instrument detects an error in the data or stored in the non volatile memory This MEMORY ERROR message is generally displayed after a GLP MEMORY battery failure Press the key The default values are then used instead of the erroneous data If this error remains dis played after a battery change please contact your local RADIOMETER representative NEW CELL CAL The last cell calibration performed is older REQUIRED than the Calibrate every parameter entered during Edit Calibration mode Press the Cal key to start a calibration NEW METHOD CAL The last TDS or CONCENTRATION method REQUIRED c
113. ormat All and the sample number The CDM230 prints a result line at specific time intervals Print Interval entered during Edit Sample This line comprises the result the sample temperature the time of the measurement and the STAB stability indicator showing if the measurement is stable when printed Example of printout for a Conductivity method and if Printout Format All The measurements are printed at specific time intervals e g every 10 s 3 For MANUAL measurement the printout equivalent to an AUTOREAD measurement is obtained after a pressing If the key is pressed a second time a new measurement starts and you can print a second line in the result table by pressing the key again and so on CDM230 Conductivity Meter 654R01N001 4 DEC 1995 09 48 SAMPLE Method B Cell No 1 Mode Conductivity Last Cell calibration 28NOV95 08 42 Cell Constant value 1 008 cm 1 Sample No 6 104 7 mS cm 22 4 C 09 48 24 ST 104 7 mS cm 22 4 C 09 48 34 STA 104 7 mS cm 22 4 C 09 48 44 STAB 9 7 Method Table If you press the Method key followed by Print the CDM230 will print a table summarizing the three methods The table describes each method with method name measurement mode cell number cell constant value date of the last cell calibration performed date of the last method calibration performed type of sample mea
114. own for 3 seconds the Printer output display appears 2 Using the left or right arrow key select between 9600 n 8 1 9600 baud no parity 8 data bits and 1 stop bit 2400 e 7 1 2400 baud even parity 7 data bits and 1 stop bit The parameters must be selected in accordance with those defined on the printer see the User s Manual of the printer Note If you press the down arrow key from the Printer output display the Instrument ID display appears as explained below KEYBOARD BEEP NO YES 1 5 Entering the Instrument ID The instrument identification entered by the user in the Edit Print mode display will appear at the top of all printouts 1 Hold the Print key down for 3 seconds the Printer output display appears Move to the Instrument ID display by pressing the down arrow key 2 Using the left or right arrow key adjust the instrument identification R xxx Note If you adjust the instrument identification to R the CDM230 displays R N000 and no ID will appear on the printouts 3 Press the down arrow key and using the left or right arrow key adjust the Instrument identification Nxxx The instrument ID is marked on the rear panel of the CDM230 Leave the Edit mode by pressing the Method Cal Sample or Tref key 1 6 Description of Keys Press the Method key to select one of 3 available methods A B or C By holding the key down for 3 seconds you can edit the method selecte
115. own for 3 seconds and select a Concentration method and or the correct cell See also page 6 2 Editing the Method parameters Press the Sample key for 3 seconds to enter the Edit Sample mode Using Select the measurement mode between Autoread At intervals By pressing The AUTOREAD function locks the result on the display as soon as the signal is stable Stability is defined by the Stability criterion and Accept time set in the Edit Sample mode With the AT INTERVALS function the sample is measured continuously and printed out at specific time intervals set in Edit Sample The measurements will stop at the end of Stop print after set in the Edit sample mode Using the By pressing function a live reading is displayed When you con sider the measurement to be stable press the key There is no other Sample parameters to edit in this case If Autoread or At Intervals is selected press the down arrow key then edit the following parameters Stability Crit and Accept Time if Autoread see page 7 17 for more information Stability Crit Print Interval Stop Print After and Store in GLP if At Intervals see pages 7 18 and 7 19 for more information METHOD B CELL2 CONCENTRATION SAMPLE RESULT AUTOREAD Sample 3 seconds SAMPLE RESULT AT INTERVALS SAMPLE RESULT BY PRESSING 6 8 C Performing a Cell calibration see also the display overview page 6 14 Using Select the Concentra
116. pe Conductivity Range mode Autorange Unit selection S cm Printout format Result Warning beep No Result beep No Reset method No Calibration Calibration mode Cell const Entered Cell constant value 1 cm 1 Cable resistance 0 000 Cable capacitance 0 pF Sample Sample result Autoread Stability criterion 1 0 min Accept time 60 s Pure water correction No Tref Temperature correction Enter below Reference temperature 25 C Temperature coefficient 2 20 C GLP Keyboard beep No Print Printer output 9600 n 8 1 Instrument ID 654R N000 Other parameters Current method A language English next sample no 1 Sample temperature 25 C A4 1 Remote Control using a PC Connect the CDM230 printer output to a serial port on the PC using the RADIOMETER ANALYTICAL cable part no A95X501 or A95X502 A95X501 for PC with a 9 pin serial port and A95X502 for PC with a 25 pin serial port Data transmission Two options are available The option is set in the Edit Print mode see chapter 6 8 data bits 1 stop bit no parity Baud rate 9600 7 data bits 1 stop bit even parity Baud rate 2400 Note All the commands given in the table below must be followed by a Carriage Return Keyboard emulation Switch on the CDM230 and send the gt CE command first answer lt CE the remote control is now active Command Answer Comments gt M lt M Method key routine mode gt T lt
117. ple 8 For a TDS method applying the TDS Factor found by a 1 point calibration to display the TDS of the sample in mg L 9 For a concentration method applying the concentration coeffi cients found by a 1 2 or 3 point calibration to display the concentra tion of the sample Steps 2 to 6 are described below paragraph Conductivity and resistivity measurements step 7 on page 8 7 paragraph Salinity measure ments step 8 on page 8 9 paragraph TDS measurements and step 9 on page 8 11 paragraph Concentration measurements 8 2 Conductivity and Resistivity Measurements Steps 1 to 6 see page 8 1 are performed for a Conductivity method and steps 1 to 5 for a Resistivity method Steps 2 to 6 are described below 1 Cable correction The cable correction takes into account the cable resistance and the cable capacitance Cable resistance correction The influence of the cable resistance on the measured conductance Gm is as follows Gs solution conductance S R cable resistance Cable capacitance correction The cable capacitance influences the measurements of very low con ductance Therefore the CDM230 makes a correction for the 4 000 S conductance range The empirical equation used by the CDM230 enables an accurate measurement correction to be obtained for cable capacitances up to 1000 pF 2 Cell constant correction The conductance G of a solution is a result of the sum of contributions
118. poles platinised built in temperature sensor 3 m cable E61M012 MAB6 plug CDC745 9 Conductivity Cell 2 poles platinised epoxy body screw cap E61M013 CDC565 Conductivity Cell 4 poles E61M003 CDC865 Conductivity Cell 4 poles platinised E61M004 T201 Temperature Sensor E51M001 CL136 Electrode cable FX coax 1m MAB6 A94L136 CL336 Electrode cable FX coax 3m MAB6 A94L336 A5 2 Plug Adapter UHF F MAB6 M A94P001 Printer cable 9 25 pin A95P201 PC cable 9 25 pin A95X502 PC cable 9 9 pin A95X501 Recorder cable A95R102 Cable for VIT90 to CDM230 A95A220 Conductivity standard 500 ml 1 Demal KCl S51M001 Conductivity standard 500 ml 0 1 Demal KCl S51M002 Conductivity standard 500 ml 0 01 Demal KCl S51M003 Conductivity standard 500 ml 0 05 NaCl S51M004 KS910 0 1 M KCl solution 500 ml C20C250 KS920 0 1 M KCl solution 500 ml C20C270 KS930 0 1 M KCl solution 500 ml C20C280 A6 1 Specifications Measuring range conductivity 0 001 S cm to 2 000 S cm with a cell constant of 1 cm 1 Automatic or manual range selection Seven conductance ranges 4 000 S 40 00 S 400 0 S 4 000 mS 40 00 mS 400 0 mS and 2 000 S Measuring range resistivity 0 5 cm to 500 M cm with a cell constant of 1 cm 1 Automatic range selection Measuring range salinity 2 00 to 42 00 with a cell constant of 1 cm 1 Automatic range selection Measu
119. r 3 seconds to enter the Edit Calibration mode Using Select a calibration mode for the cell selected Cell 1 Cell 2 or Cell 3 Cell constant Enter below select this option when you know the cell constant value and only want to change it in the Edit mode The cell constant value is entered on the next display Cell constant Entered select this option when you want to enter the cell constant value and not to determine it During routine operation simply press the Cal key the cell constant is displayed and a new value can be entered Cell constant Adjusted In routine mode while the cell is dipped in your standard the cell constant can be adjusted You must know the conductivity of your standard at the temperature used Calibration using KCl NaCl Seawater Std the cell constant is determined by the CDM230 using a standard the conductivity value of which is stored at different temperatures These standards are see pages 2 5 and 2 6 for details 1 D KCl range 0 0 to 27 0 C 0 1 D KCl range 0 0 to 50 0 C 0 01 D KCl range 0 0 to 50 0 C 0 05 NaCl range 0 0 to 99 9 C Seawater standard range 2 0 to 35 0 C CALIBRATE USING SEAWATER STD CELL 1 CONSTANT ADJUSTED METHOD A CELL1 CONDUCTIVITY CELL 1 CONSTANT ENTERED CELL 1 CONSTANT ENTER BELOW CALIBRATE USING 0 05 NaCl CALIBRATE USING 0 01 KCl CALIBRATE USING 0 1 KCl CALIBRATE USING 1 KCl Cal 3 s
120. ration mode Enter the cell constant value using the left and right arrow keys then start the sample measurements by pressing the Sample key Available range 0 05 cm 1 to 15 cm 1 adjustable by steps of 0 0001 cm 1 below 10 cm 1 or 0 001 cm 1 between 10 and 15 cm 1 If Cell constant Adjusted has been selected in the Edit Calibration mode Press the key to continue If Calibrate using 1 KCl has been selected in the Edit Calibration mode You can also have 0 1 KCl 0 01 KCl 0 05 NaCl or Seawater Std Press the key to continue If the CDM230 displays Dip cell in Standard the standard to be used is a standard of your choice You must know the conductivity or resistivity of this standard at a given temperature If the CDM230 displays Dip cell in 1 KCl 0 1 KCl 0 01 KCl 0 05 NaCl or Seawater Std it means that the standard to be used is one of the 5 listed below The conductivities and resistivities of these standards are stored against temperature in the CDM230 memory within a specified temperature range These 5 standards are KCl 1 Demal temperature range 0 0 to 27 0 C KCl 0 1 Demal temperature range 0 0 to 50 0 C KCl 0 01 Demal temperature range 0 0 to 50 0 C NaCl 0 05 weight weight temperature range 0 0 to 99 9 C Standard seawater temperature range 2 0 to 35 0 C CELL 1 CONSTANT 1 0000 cm 1 DIP CELL 1 IN STANDARD DIP CELL 1 IN 1 KCl 2 6 Definit
121. red in the GLP memory if Store in GLP All results has been selected in the Edit Sample mode The UNSTABLE message is displayed with the result if the Stability criterion has not been reached before the end of Print Interval The measurement will automatically stop at the end of the Stop print after delay entered in EDIT Sample mode 7 Starting a new measurement From the result display press the key to start a new MANUAL or AUTOREAD measurement The measurement procedure starts from step 4 and the sample number is automatically incremented Tr25 11 65mS cm RESULT 23 3oC 2 15 Press the Sample key if you want to start a new AT INTERVALS measurement or if you want to adjust the sample ID number before starting a measurement 8 Stopping a measurement in progress You can stop a measurement in progress by pressing the Method Tref Cal GLP or Sample key 2 16 Sample measurements Display Overview for a conductivity method STA 12 39mS cm 20s If no temperature sensor and no temperature correction 12 41mS cm UNSTABLE If no temperature sensor connected and temperature correction selected Adjust to the sample temperature If no temperature sensor and temperature correction SAMPLE TEMP 25 0 oC NEXT SAMPLE No 1 During 3 seconds Entry of the sample ID number STA 12 39mS cm 20s 23 0 oC STA 12 39mS cm 20s 23 0 oC If temperature sensor and temperature correction During stabilisati
122. ring range TDS 0 to 9999 mg L with a cell constant of 1 cm 1 Automatic range selection Temperature measuring range 9 9 C to 99 9 C Resolution conductance 1 4000 full scale Resolution temperature 0 1 C Accuracy conductivity 0 5 of reading 3 of least significant digit for the 4 S range 1 of reading 3 of least significant digit for the 2 S range 0 2 of reading 3 of least significant digit for all other ranges Accuracy resistivity Typically 1 of reading 3 of least significant digit Accuracy temperature 0 3 C between 0 and 70 C and 0 5 C between 70 and 100 C A6 2 Measuring frequencies 94 Hz in 4 000 S and 40 00 S ranges 375 Hz in 400 0 S range 2 93 kHz in 4 000 mS range 23 4 kHz in 40 00 mS range 46 9 kHz in 400 0 mS and 2 000 S ranges Methods 3 programmable methods A B C 5 modes Each method can be edited for conductivity resistivity Salini ty TDS or Concentration Measurement procedures Conductivity resistivity salinity TDS or concentration reading with sliding stability indicator AUTOREAD mode the result is locked on the display when the user selected stability criterion and or accept time are reached AT INTERVALS mode measurement reading and printing at set inter vals BY PRESSING mode the result is obtained manually by pressing the key The conductivity of pure water can be subtracted from the m
123. rs Select a method A B or C with and hold the Method key down for 3 seconds to enter the Edit Method mode For example method B Select the conductivity cell Cell 1 Cell 2 or Cell 3 used for Concentration measurements with For example Cell 2 Using select Concentration Using Select the measurement unit Concentration can be measured in mg l g l g kg mg kg g kg ppm ppb mol l mmol l mol l mol kg mmol kg mol kg or g l Important to obtain the best reading resolution select a concentration unit in order to have at least 1 000 displayed for all standard concentrations Example for a standard concentration of 10 mol l select mol l for the unit and not mmol l or mol l Using select the printout format you require for sample measurements If you choose All the cell constant and Concentration coefficient s will be included in the printout see also chapter 9 Using select Yes if you want a Warning Beep three short tones to accompany any warn ing message Using select Yes if you want a Result Beep one long tone to sound when a result has been obtained METHOD B CELL1 CONDUCTIVITY USE CELL 1 2 3 METHOD B CONCENTRATION Method 3 seconds RESULT BEEP NO YES WARNING BEEP NO YES PRINTOUT FORMAT ALL PRINTOUT FORMAT RESULT UNIT SELECTION mg l 6 3 B2 Editing the Calibration cell parameters Using Select the Concentration method B for
124. s the concen tration as a function of the measured conductivity A calibration of a con centration method consists of determining 1 to 3 coefficients of the equa tion To calculate one coefficient the CDM230 measures the conductivity of a standard solution of known concentration at the standard temperature then corrects the conductivity to a reference temperature if selected in the Edit Tref mode See chapter 8 Theory page 8 11 At the end of a method calibration the CDM230 will save the 1 to 3 coefficient s found for the method selected A B or C Remarks Calibration standard solutions with low concentrations should be prepared just before a calibration is to be performed Always carry out measurements in the standard having the lowest concentration first in order to avoid the carry over of species from one standard to another Make sure that calibration standards and samples have the same temperature Read the paragraph Limitations of the concentration method on page 8 12 Operating Instructions Using Select the Concentration method with the correct cell method B with Cell 2 for example and press the Cal key If there is no Concentra tion method or if the Concentration method does not use the correct conductivity cell Cell 2 for example hold the Method key down for 3 seconds and select a Concentration method and or the correct cell See also page 6 2 Editing the Method parameters METHOD
125. since measurement started if no Accept time has been entered NEXT SAMPLE No 1 SAMPLE TEMP 25 2 C STAB 11 67mS cm 25s 23 3oC STAB 11 67mS cm 58s 22 2oC 2 14 For AT INTERVALS measurements the Stop Print after entered in the Edit Sample mode is counted down The CDM230 displays the time remaining until the next result printing if no Stop Print after has been entered 6 End of measurements For MANUAL measurements when the stability is acceptable i e when the stability indicator displays STAB continuously press the key the measurement value is locked on the display The result is automatically printed out and is stored in the GLP memory The measurement can be accepted with the key whether it is stable or not Tr25 means that the conductivity has been corrected to a reference tem perature of 25 C For AUTOREAD measurements when the stability is reached or at the end of the Accept time the measurement value is locked on the display the result is printed out and stored in the GLP memory At the end of the Accept time if the stability criterion has not been reached the measurement is locked on the display with the UNSTABLE warning message The result display is like the one obtained for the MANUAL measurements see above For AT INTERVALS measurements the Print Interval entered in Edit Sample mode sets the time delay desired between each measurement and result printout Each measurement is sto
126. sure ments AUTOREAD AT INTERVALS or BY PRESSING reference temperature if a temperature compensation is programmed Edit Data To print the Edit Data enter in Edit Method Calibration Sample Tref or Print by holding down the appropriate key Method Cal Sample Tref or Print for 3 seconds press the Print key Example of printouts obtained for a Conductivity method Edit Method CDM230 Conductivity Meter 654R01N001 30NOV95 09 42 Method Mode Cell Cell K Cell Meth Sample Ref No cm 1 cal cal Result Temp A Conductivity 1 1 020 17NOV95 Manual 25 C B Resistivity 1 0 887 10NOV95 Autoread 25 C C Concentration 2 1 020 28NOV95 28NOV95 Interval 25 C CDM230 Conductivity Meter 654R01N001 4 DEC 1995 09 51 METHOD Method A Cell No 1 Mode Conductivity Unit S cm Range selection Autorange Printout Format All Warning Beep No Result Beep No 9 8 Edit Calibration Edit Sample Edit Tref Edit Print Note The Edit GLP parameters cannot be printed CDM230 Conductivity Meter 654R01N001 4 DEC 1995 09 54 CELL CALIBRATION Cell No 1 Cell Constant value 1 0008 cm 1 Cell Constant adjusted to calibration standard Calibrate Every 7 day s Cable resistance 0 Cable capacitance 0 pF
127. t Sample mode With the AT INTERVALS function the sample is measured continuously and printed out at specific time intervals set in Edit Sample The measure ments will stop at the end of Stop print after set in the Edit sample mode Using the By pressing function a live reading is displayed When you consider the measurement to be stable press the key There is no other Sample parameters to edit in this case If Autoread or At Intervals is selected press the down arrow key then edit the following parameters Stability Crit and Accept Time if Autoread see page 7 17 for more information Stability Crit Print Interval Stop Print After and Store in GLP if At Intervals see pages 7 18 and 7 19 for more information METHOD B CELL2 TDS SAMPLE RESULT AUTOREAD Sample 3 seconds SAMPLE RESULT AT INTERVALS SAMPLE RESULT BY PRESSING 5 7 C Performing a Cell calibration see also the display overview page 5 11 Using Select the TDS method with the correct cell method B with Cell 2 for example and press the Cal key If there is no TDS method or if the TDS method does not use the correct conductivity cell Cell 2 for example hold the Method key down for 3 seconds and select a TDS method and or the correct cell See also page 5 2 Editing the Method parameters The next screen depends on the selection you made in Edit Calibration see page 5 3 If you have entered Cell 2 Const
128. tery and Adjusting the Contrast 10 5 Appendix 1 Table 1 Conductivity values for Demal solutions A1 1 Table 2 Resistivity values for Demal solutions A1 3 Table 3 Conductivity values for Molar solutions A1 5 Table 4 Resistivity values for Molar solutions A1 7 Table 5 Temperature coefficients for conductivity measurements A1 9 Table 6 Temperature coefficients for resistivity measurements A1 9 Table 7 Conductivity and resistivity values of a 0 05 NaCl solution A1 10 Appendix 2 Connection of Peripherals A2 1 Appendix 3 Default Values A3 1 Appendix 4 Remote Control using a PC A4 1 Appendix 5 Accessories A5 1 Appendix 6 Specifications A6 1 Appendix 7 Examples of Applications A7 1 Appendix 8 Keyword Index A8 1 1 1 PRINTER
129. the cell constant and either TDS factor or the concentration coefficients will be included in the printout see also chapter 9 Using Select Yes if you want a Warning Beep three short tones to accompany any warning mes sage Using Select Yes if you want a Result Beep one long tone to sound when a result has been obtained Using Select Yes if you want to reset the method to default values When No is selected press the up arrow key or leave the Edit Method mode by pressing the Method Sample Cal or Tref key If Reset method Yes the CDM230 asks you to confirm the method reset If No is selected no method reset will be performed A Reset method operation will replace all the parameters in Edit Method Sample and Tref modes with the default values The parameters of the Edit Calibration Print and GLP are not affected by a reset method opera tion The default values of the parameters are listed in appendix 3 RESULT BEEP NO YES RESET METHOD NO YES If Yes CONFIRM RESET NO YES WARNING BEEP NO YES PRINTOUT FORMAT ALL PRINTOUT FORMAT RESULT 7 6 Edit Calibration Cell Calibration The following settings are common and accessible for conductivity resistiv ity and salinity methods For a TDS method go to page 7 10 and for a Concentration method go to page 7 13 Using Select the method A B or C using the cell Cell 1 Cell 2 or Cell 3 you want to calibrate Press the Cal key fo
130. tion method with the correct cell method B with Cell 2 for example and press the Cal key If there is no Concentration method or if the Concentration method does not use the correct conductivity cell Cell 2 for example hold the Method key down for 3 seconds and select a Concentration method and or the correct cell See also page 6 2 Editing the Method parameters The next screen depends on the selection you made in Edit Calibration see page 6 3 If you have entered Cell 2 Constant Enter below the cell constant is displayed and cannot be changed here There is no cell calibration to perform If you have entered Cell 2 Constant Entered Enter the Cell constant value using the left and right arrow keys The cell calibration is over If you have entered one of the five Calibrate using option start the cell calibration by dipping the cell into the specified standard solution then follow the operating instructions of pages 2 5 to 2 9 METHOD B CELL2 CONCENTRATION DIP CELL 2 IN 0 05 NaCl Cal CELL 2 CONST 1 000cm 1 CELL 2 CONST CALIBRATION or If Cell 2 Const Calibration Or Dip Cell 2 in Standard 1 KCl 0 1 KCl 0 01 KCl Seawater Std CELL 2 CONST 1 000 cm 1 or 6 9 D Performing a Method calibration see also the display overview page 6 14 Before performing a concentration measurement the method must be calibrated against standards to define the equation which give
131. ty value shown on the display When STAB is displayed it means that the measurement variations are less than 1 min If a temperature probe is connected the measured temperature is also displayed Adjust the cell constant value displayed within arrows until the meas ured value shown on the first line matches the conductivity or resistiv ity value of your standard at current temperature Table 1 page A1 1 gives the conductivity values against temperature for some standards Press the key to accept the cell constant value The cell constant is displayed and stored in the GLP memory with the conductivity cell used Cell 1 in our example STAB 3 081 S cm 1 8921 24 3oC CELL 1 CONSTANT 1 8921 cm 1 2 8 The calibration is completed You can for example start a sample measurement by pressing the Sample key Important For high precision measurements it is necessary to determine the cell constant by performing a calibration measurement on a standard thermostatted at the desired temperature No temperature correction is made during a cell calibration procedure e If the previous CDM230 display was Dip cell in 1 KCl 0 1 KCl 0 01 KCl 0 05 NaCl or Seawater std and if no temperature sensor is connected the next display is The temperature must be adjusted manually using the left or right arrow keys Press key to continue If a temperature sensor is connected the temperature will be meas ured directly
132. uation select Temp correction Natural water Use this option only if you measure on natural water samples lake and river waters for example The CDM230 displays the measurement at 25 C from the value measured at the sample temperature and using a conversion factor from an equation stored in the CDM230 memory This equation fits the conductivity variations against temperature for natural water given by the standard ISO DIS 7888 Table 3 1984 06 22 See chapter 8 Theory If you select Temp correction None measurement is displayed at the sample temperature Using Select the method A B or C for which you want to edit the temperature data and press the Tref key for 3 seconds Note that there is no Edit Tref mode for Salinity and TDS methods Using Select Temp correction None or select one of the two types of temperature correction If Temp correction Enter below adjust the Reference temperature the measured conductivity will be corrected to Available range 0 to 99 C Now adjust the Temperature coefficient Determination of the coefficient is explained on the next page Available range 0 00 to 9 99 C Press the up arrow key or leave the Edit Tref mode by pressing the Method Sample Cal or Tref key METHOD A CELL1 CONDUCTIVITY TEMP CORRECTION NATURAL WATER REFERENCE TEMP 25 C TEMPERATURE COEF 2 20 C Tref 3 seconds TEMP CORRECTION ENTER BELOW TEMP CORRECTION NONE 7 22 D
133. units connect the electrical zeros of the instruments to the same ground Connecting the Conductivity Cell and Temperature Sensor Secure the conductivity cell firmly in the cell holder of the sample stand CONDUCTIVITY CELL INPUT Use the socket marked CELL for connection of the conductivity cell The CDC641T has a built in temperature sensor Note The conductivity cell used must have a consistent cell constant over the conductivity range studied It is recommended to determine the cell constant regularly once a week To obtain the most accurate high conductance measurements gt 20 mS with a 2 pole conductivity cell the resistance of the cell cable should be known and entered in the Edit Calibration mode If you are measuring low conductance lt 4 S with a 4 pole conductivity cell the cable capacitance should be known and entered in the Edit Calibration mode TEMPERATURE SENSOR INPUT A separate temperature sensor for example the RADIOMETER ANALYTICAL temperature sensor T201 may be connected to the TEMP socket 1 3 Choosing the Language A choice of English French German Spanish and Italian is available as the language used on the CDM230 displays and printouts 1 Switch on the CDM230 with the on off switch The instrument will perform its Autotest 2 Select the language you require during the setup state first 3 seconds after switching on the instrument using the left and right arrow keys 3 If no k

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