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AP85 Portable Waterproof pH/Conductivity Meter

1. i serrrrrnrnnnnnnnu 32 6 6 Program 5 0 Viewing previous conductivity TDS calibration data ccccseee 33 6 7 Program 6 0 Viewing conductivity TDS probe data effective cell constant 34 6 8 Program 7 0 Conductivity TDS measurement configuration 35 38 P7 1 Selecting Ready indicator auto endpoint function errrrrrrnninnnnn 35 IP7 2 Selecting Cor SB iii os access whet hs ns Gein hla E 36 P7 3 Selecting automatic or manual temperature compensation isererrrni 37 P7 4 Setting the TDS factor asisecsss stisk ai 38 6 9 Program 8 0 Temperature settings ccccccceseeesesesesseseseeseseeesssessesessesesteseateneseeneseenes 39 40 P8 1 Setting the temperature coefficient rrsornrrnnnnnnnnnnnnn nn 39 P8 2 Selecting the normalization temperature ccceccccsecseeteseeseeeeeseeseesessesneseeneenesnens 40 6 10 Program 9 0 Resetting to factory default settings conductivity TDS ee2 41 7 Probe care and maintenance ssccccssssssssscessceeecseeceeeceeeseeeeeees 42 43 ZAGpEV electrode cates 013 tice ie ea ear Midian i 42 43 72 Conductivity probe CALE sds 43 8 Troubleshooting esesseseseoseesossesossesossesossesossesosseeoosssossceosseeosssesossesssee 44 9 Error Messages ssssessseseesoeesssesesceecseeoseosecoeesoseosseseeoeecseeoeeceeeseeoeeosseeee 45 10 Specifications eesseesosseosseesssesossesecseso
2. See figure c 33 P6 0 Viewing conductivity TDS probe data Program 6 has five view only options that let you check your conductivity TDS probe s parameters for diagnostic purposes These options show you the effective cell constant for each range The cell constant is adjusted according to your calibration From measurement mode 1 Press the Mode key to select conductivity or TDS measurement mode 1 Press the Set up key to enter Set Up mode 2 Press the A and Y keys to scroll through subgroups until you view parameter P6 0 See figure Q 3 Press the ENTER key repeatedly to view the effective cell constant for each range Range Conductivity TDS P6 1 R1 0 00 19 99 uS 0 00 9 99 ppm P6 2 R2 0 0 199 9 uS 10 0 99 9 ppm P6 3 R3 0 1999 uS 100 999 ppm P6 4 R4 0 00 19 99 mS 1 00 9 99 ppt P6 5 R5 0 0 199 9mS 10 0 199 9 ppt See figure B 4 When you have scrolled through all probe data you will automatically return to the subgroup menu Press the CAL MEAS key to return to measurement mode Notes Cell constants will degrade with time and usage You can use this feature to alert you to when your probe needs cleaning or to when you need to replace your probe 34 3 0 Conductivity TDS measurement configuration P7 1 READY indicator and auto endpoint function This program lets you select e READY indicator on to indicate when the reading is stable
3. B Press the A key until the lower display reads P8 0 C Press the ENTER key twice The lower display reads tCO and the upper display shows the temperature coefficient value should be 0 per step 1 D above D Press the A key until the upper display shows your calculated temperature coefficient E Press ENTER key to confirm the value F Press CAL MEAS key twice to return to measurement mode The calculated temperature coefficient will now be applied to all conductivity TDS readings 49 15 Appendix 4 Meter factory default settings Resetting the meter to factory default settings clears all calibration data and most other setup functions you might have changed The following settings will remain as you have set them e temperature unit of measure C or F e The temperature offset calibration value NOTE Conductivity TDS and pH data are cleared separately from each other e To clear pH data see Sub group P4 0 on page 32 e To clear conductivity TDS data see Sub group P9 0 on page 41 Type Parameter Default Remarks pH parameters P1 1 Viewing pH ae No calibration data for pH 1 68 P1 2 calibration data No calibration data for pH 4 01 P13 No calibration data for pH 7 00 USA 6 86 NIST P1 4 No calibration data for pH 10 01 USA 9 18 NIST P1 5 ES No calibration data for pH 12 45 P2 1 View electrode offset 0 0 mV No offset adjustment P2 2 View elec
4. e READY indicator off for faster meter response e Auto endpoint function on Select auto endpoint on to hold the reading when it is stable for more than 5 seconds The display automatically freezes and the HOLD indicator appears on the left side of the display Press the HOLD key to release the display and access other functions From measurement mode 1 Press the Mode key to select conductivity or TDS measurement mode 2 Press Setup key to enter Set Up mode 3 Press the A and Y keys to scroll through subgroups until you view parameter P7 0 See figure Q 4 Press the ENTER key to select parameter 7 1 See figure B 5 Press the A and Y keys to select the configuration you require SON switches the READY indicator on e OFF switches the READY indicator off eON and HOLD together switches the auto endpoint feature on 6 Press the ENTER key to confirm selection and to proceed to step 4 of P 7 2 Press the CAL MEAS key twice to return to measurement mode Notes Meter default is set for Ready indicator on and auto endpoint function off You can also change the Ready indicator and auto endpoint function in Program P3 1 available from pH mode Changes made to the Ready indicator auto endpoint function in conductivity mode will also apply to pH mode and vice versa 35 P7 2 Selecting C or F This meter lets you select between C and F units for temperature readings
5. 3 Press the A and Y keys to scroll through subgroups until you view param P9 0 in the lower dis 4 Press the ENTER key three times to play select parameter 8 2 The display See figure SETUP MEAS shows t nr on the upper display 4 Press enter key See figure Q See figure 5 Press the ENTER key again The upper display shows the normalization temperature and the lower display shows t nr See figure F 6 Press the A and Y keys to select the normalization temperature 5 Press the A and W keys to toggle between NO and YES e NO retains current settings e YES resets to factory default settings 6 Press the ENTER key to confirm selection and to return to 7 Press the ENTER key to confirm measurement mode selection and to return to the sub group menu Press the CAL MEAS key to return to measurement mode Notes SETUP MEAS To clear all pH data see page 32 See page 50 for a table of factory default settings 40 41 7 Probe Care and Maintenance pH electrode care Since your pH electrode is susceptible to particulates and contamination clean it every one to three months depending on the extent and condition of use For specialty electrode care consult the instruction manual included with your electrode pH electrode storage For best results always keep the pH bulb wet Use the protective electrode storage bottle or rubber cap filled with electrode storage solution to store your e
6. 26 P2 0 Viewing pH electrode data Program 2 has two view only options that lets you check the pH electrode parameters for diagnostic purposes It lets you view P2 1 Electrode offset P2 2 Electrode slope From measurement mode 1 Press the Mode key to select pH measurement mode 2 Press the Setup key to enter Set Up mode 3 Press the A and Y keys to scroll through subgroups until you view parameter P2 0 See figure Q 4 Press the ENTER key to select parameter P2 1 5 The display shows the electrode offset value the mV offset at pH 7 00 If you have not calibrated at any buffer the primary display shows 0 0 mV See figure O 6 Press the ENTER key to select parameter P2 2 7 The display shows electrode slope in percentage Slope displayed is the average slope based on the pH calibrations Default setting is 100 0 See figure c 8 Press the ENTER key to return to the subgroup menu Press the CAL MEAS key to return to measurement mode 27 P3 0 pH measurement configuration p g P3 1 READY indicator and auto endpoint function This program lets you select e READY indicator on to indicate when the reading is stable e READY indicator off for faster meter response e Auto endpoint function on Select auto endpoint on to hold the reading when it is stable for more than 5 seconds The display automatically freezes and the HOLD indicator appears
7. 3 CALibration indicator 9 T 15 Calibration indicator 4 pH measurement as emperature 16 Cell tantindi at indicator indicators Cell constant indicator 5 Millisiemens indicator 10 pH setup indicator 17 ON OFFiridicator conductivity 11 Automatic 18 HOLD indicator 6 Microsiemens indicator at nn 19 READY indicator ductivi EE indicator 5 Keypad The large membrane keypad makes the instrument easy to use Each button when pressed has a corresponding graphic indicator on the LCD ON OFF Powers and shuts off the meter HOLD Freezes the measured reading To activate press HOLD while in measurement mode To release press HOLD again NOTE When auto endpoint feature is switched on meter automati cally holds reading after 5 seconds of stability The HOLD indicator appears on the display Press HOLD to release auto endpoint feature MODE Selects the measurement parameter Press MODE to toggle between pH conductivity and TDS readings In calibration mode press MODE to access temperature calibration CAL MEAG Toggles user between Calibration and Measurement mode For exam ple if you are in pH measurement mode press CAL MEAS to enter PH calibration mode NOTE Temperature calibration is available from calibration mode see page 16 for directions In advanced set up mode Press CAL MEAS to return to main menu from sub menus Press CAL MEAS again to return to measurement mode from
8. From measurement mode 1 Press the Mode key to select conductivity or TDS measurement mode 2 Press Setup key to enter Set Up mode 3 Press the A and Y keys to scroll through subgroups until you view parameter P7 0 See figure c 4 Press the ENTER key four times to select parameter 7 2 See figure D 5 Press the A and W keys to toggle between C and F 6 Press the ENTER key to confirm selection and to proceed to step 4 of P7 3 Press the CAL MEAS key twice to return to measurement mode Notes You can also switch between C and F in Program P3 4 available from pH mode If you switch between C and F in conductivity mode the meter will also switch in pH mode 36 P7 3 Selecting Automatic or Manual Temperature Compensation This feature lets you select between Automatic Temperature Compensation ATC and Manual Temperature Compensation for conductivity by deactivating the temperature sensor in the conductivity TDS probe Meter default is ATC on From measurement mode 1 Press the Mode key to select conductivity or TDS measurement mode 2 Press Setup key to enter Set Up mode 3 Press the A and Y keys to scroll through subgroups until you view parameter P7 0 See figure O 4 Press the ENTER key three times to select parameter 7 3 The upper display shows ATC and the lower display shows P7 3 See figure Q 5 Press the ENTER key again The upper display
9. O 5 Wait for the measured pH value to stabilize If the READY indicator has been activated set up program P3 1 see page 28 the READY annunciator lights when the reading is stable 6 Press ENTER to confirm calibration The meter is now calibrated to the current buffer The lower display scrolls through the remaining buffer options e If you are performing a multipoint calibration go to step 7 e If you are performing a one point calibration go to step 9 7 Rinse the electrode with deionized water or a rinse solution and dip in the next pH buffer 8 Follow steps 5 to 8 for additional calibration points 9 When calibration is complete Conductivity and TDS calibration You can calibrate up to 5 conductivity or TDS points using a maximum of one point per range listed below Range Conductivity TDS NOTE R1 0 00 19 99 uS 0 00 9 99 ppm 1000 nS 1mS R2 0 0 1999pS 10 0 99 9 ppm R3 0 1999 pS 100 999 ppm 1000 ppm 1ppt R4 0 00 19 99mS 1 00 9 99 ppt R5 0 0 199 9mS 10 0 199 9 ppt If you are measuring values in more than one range make sure to calibrate each of the ranges you are measuring All new calibration data will over ride existing stored calibration data for each measuring range you calibrate e If you are measuring in ranges near to or greater than 20 mS 10 ppt or near to or lower than 100 pS 50 ppm calibrate the meter at least once a week to get specified 1 full scale ac
10. See figure o 5 Press the ENTER key again The upper display shows a value and the lower display shows tdS See figure 0 6 Calculate the TDS factor of your solution See Appendix 2 on page 48 for information on how to calculate the TDS factor 7 Press the A and Y keys to select your calculated TDS conversion factor 8 Press the ENTER key to confirm selection and to return to the subgroup menu Press the CAL MEAS key to return to measurement mode 38 Kgg 8 0 Temperature Settings P8 1 Selecting the temperature coefficient The temperature coefficient is the amount of change in conductivity per degree of temperature it is expressed in percent per C or F Entering the exact temperature coefficient of your solution lets you accurately compensate temperature for almost any solution You can adjust 0 0 to 10 0 per C or F Meter default is 2 1 per C or F From measurement mode 1 Press the Mode key to select conductivity or TDS measurement mode 2 Press Setup key to enter Set Up mode 3 Press the A and Y keys to scroll through subgroups until you view parameter P8 0 See figure 4 Press the ENTER key to select parameter 8 1 The display shows T CO on the upper display See figure O 5 Press the ENTER key again The upper display shows the temperature coefficient and the lower display shows T CO See figure c 6 Press the A and Y keys to select the temper
11. left side of the display Press the HOLD key to release the reading Switch the Auto endpoint feature on or off in Set up program P7 1 see page 35 for directions 19 Using manual ranging function conductivity TDS When shipped from the factory your meter automatically selects the range in which your readings appear The manual ranging function lets you select the specific range in which you want to work From measurement mode 1 To select the desired measuring range press the RANGE key while in Conductivity measurement mode The first range will appear on the display The MEAS indicator blinks and the Range number flashes briefly in the lower display Range Conductivity TDS R1 0 00 19 99 uS 0 00 9 99 ppm R2 0 0 199 9 uS 10 0 99 9 ppm R3 0 1999 uS 100 999 ppm R4 0 00 19 99 mS 1 00 9 99 ppt R5 0 0 199 9 mS 10 0 199 9 ppt See figure Q 2 Press the RANGE key again if needed until desired range is selected 3 To reselect the Auto ranging function repeatedly press the RANGE key until the MEAS indicator appears without blinking Notes This meter will not let you manually select a range in which the reading will be overrange The meter resets to the Auto ranging function once it is turned off You will have reset the manual ranging function each time you turn the meter off 20 Selecting manual temperature compensation conductivity or TDS For manual temperature compensation in c
12. on the left side of the display Press the HOLD key to release the display and access other functions From measurement mode 1 Press the Mode key to select pH measurement mode 2 Press Setup key to enter Set Up mode 3 Press the A and Y keys to scroll through subgroups until you view paramejgg P3 0 See figure 4 Press the ENTER key to select param 3 1 See figure 5 Press the A and Y keys to select the configuration you require e OFF switches the READY indicator off e ON switches the READY indicator on ON and HOLD together switches the auto endpoint feature on 6 Press the ENTER key to confirm selection and to proceed to step 4 of P 3 2 Press the CAL MEAS key twice to return to measurement mode Notes Meter default is set for Ready indicator on and auto endpoint function off You can also change the Ready indicator and auto endpoint function in Program P7 1 available from conductivity TDS mode Changes made to the Ready indicator auto endpoint function in pH mode also apply to conductivity mode and vice versa 28 P3 2 Selecting number of pH calibration points Program P3 2 lets you select the number of pH calibration points the meter will use in calibration mode 2 3 4 or 5 The meter will automatically exit calibration mode after you have calibrated to your selected number of points From measurement mode 1 Press the Mode key to select pH measurement mode 2
13. pH settings SETUP MEAS 5 P5 0 Viewing conductivity TDS calibration data 6 P6 0 Viewing conductivity TDS probe data 7 P7 0 Conductivity TDS configuration 8 P8 0 Conductivity TDS temperature parameters 9 P9 0 Resetting meter to factory default conductivity TDS settings See pages 24 25 for a more detailed overview on the different parameters available in the sub group modes 6 Press the A or Y keys to offset the temperature to the measured value from step 5 See figure Q 7 Press ENTER to confirm the selected temperature and to return to measure ment mode The meter will now compensate readings for the manually set temperature Notes To exit this program without confirming the manual temperature compensation value DO NOT press ENTER in step 7 Press CAL MEAS instead Setting the manual temperature compensation value for conductivity or TDS will change the manual temperature compensation value for pH to the same value and vice versa 22 511 Advanced set up mode detailed overview Press the SETUP key to enter Set up mode Press the A and Y keys to scroll through sub groups Sub groups available from pH measurement mode P1 0 Viewing pH calibration data P1 1 View previous pH calibration data pH 1 68 P1 2 View previous pH calibration data pH 4 01 P1 3 View previous pH calibration data pH 7 00 6 86 P1 4 View previous pH calibration data pH 10 01 9 18 P1 5 View
14. previous pH calibration data pH 12 45 P2 0 Viewing pH electrode data P2 1 View electrode offset P2 2 View electrode slope P3 0 pH configuration P3 1 Ready indicator on or off auto endpoint on or off P3 2 Select number of pH calibration points P3 3 Select USA or NIST buffer sets P3 4 Select F or C Instructions on page 32 24 P4 0 Reset to factory default pH Reset pH data to factory default settings Sub groups available from conductivity TDS measurement mode Instructions on page 33 P5 0 Viewing Con TDS calibration data P5 1 View conductivity TDS calibration data R1 R1 0 00 19 99 uS 0 00 9 99 ppm P5 2 View conductivity TDS calibration data R2 R2 0 0 199 9 uS 10 0 99 9 ppm P5 3 View conductivity TDS calibration data R3 R3 0 1999 uS 100 999 ppm P5 4 View conductivity TDS calibration data R4 R4 0 00 19 99 mS 1 00 9 99 ppt P5 5 View conductivity TDS calibration data R5 R5 0 0 199 9 mS 10 0 199 9 ppt Instructions on page 34 P6 0 Viewing Con TDS probe data P6 1 View effective cell constant R1 R1 0 00 19 99 uS 0 00 9 99 ppm P6 2 View effective cell constant R2 R2 0 0 199 9 uS 10 0 99 9 ppm P6 3 View effective cell constant R3 R3 0 1999 uS 100 999 ppm P6 4 View effective cell constant R4 R4 0 00 19 99 mS 1 00 9 99 ppt P6 5 View effective cell constant R5 R5 0 0 199 9 mS 10 0 199 9 ppt P7 0 Con TDS configu
15. retain the old calibration data in the measuring range of the calibration e You can offset the TDS reading up to 40 from the default setting If your meas ured value differs by more than 40 clean or replace probe as needed j Temperature calibration The temperature sensor located in the conductivity cell is factory calibrated Calibrate your sensor only if you suspect sensor drift that may have occurred over a long period of time or if you have a replacement probe Temperature calibration 1 Make sure the conductivity cell or alternative temperature element is attached to the 6 pin connector 2 Switch the meter on The ATC annunciator will appear at the right hand side of the LCD 3 Press the CAL MEAS key to enter calibration mode either pH or conductivity The CAL indicator will appear above the primary display 4 While in calibration mode press the MODE key to enter temperature calibration mode The primary display shows the last set temperature value and the secondary display shows the temperature reading with zero offset See figure 5 Dip the ATC element into a solution of known temperature i e a temperature bath Allow time for the temperature element to stabilize 6 Scroll with the V and A keys to set the correct temperature value i e the temperature of the temperature bath You can adjust the reading in incre ments of 0 1 C See figure GB 7 Once you have selected the correct t
16. want to use a separate temperature probe you will need to disconnect the conductivity TDS probe to allow for connection of the separate temperature sensor You can use any standard pH electrode with a BNC connector with this meter Conductivity TDS probes All in One pH electrodes with a built in temperature element and temperature probes require a notched 6 pin connector NOTE Keep connector dry and clean Do not touch connector with soiled hands To connect the pH electrode 1 Slide the BNC connector of the probe over the BNC connector socket on the meter Make sure the slots of the connector are in line with the posts of the socket Rotate and push the connector clockwise until it locks See figure below 2 To remove probe push and rotate the connector counterclockwise While holding onto the metal part of the connector pull probe away from the meter CAUTION Do not pull on the probe cord or the probe wires might disconnect To connect the conductivity TDS temperature probe 1 Line up the notch and 6 pins on the meter with the holes in the 6 pin connector Push down and turn the locking ring clockwise to lock into place See figure below 2 To remove probe turn the locking ring counterclockwise on the probe connector Pull probe away from the meter NOTE follow the same directions to connect an optional separate temperature element CAUTION Do not pull on the probe cord or the probe wires might disconn
17. 0 0 99 9 ppm 30 0 to 85 0 ppm 0 1999 uS 600 to 1700 uS 100 999 ppm 300 to 850 ppm 0 00 19 99 mS 6 00 to 17 00 mS 1 00 9 99 ppt 3 00 to 8 50 ppt 0 0 199 9 mS 60 0 to 170 0 mS 10 0 199 9 ppt 30 0 to 170 ppt Temperature coefficient This meter is factory set to a temperature coefficient of 2 1 per C For most applications this will provide good results See Program P8 1 on page 39 to set the temperature coefficient to a different value See Appendix 3 Calculating Temperature Coefficients on page 49 to determine the appropriate temperature coefficient for your solution Normalization temperature The factory default value for normalization temperature is 25 C If you need to normalize to a value other than 25 C see Program P8 2 on page 40 CONTINUED ON NEXT PAGE 13 To calibrate conductivity 1 If necessary press the MODE key to select conductivity mode See figure Q 2 Rinse the probe thoroughly with deionized water or a rinse solution then rinse with a small amount of calibration standard Leave probe 3 Dip the probe into the calibration guard on standard Immerse the probe tip beyond during the upper steel band Stir the probe measurement gently to create a homogeneous sample Immerse See figure probe beyond 4 Wait for the measured conductivity upper steel value to stabilize If the READY band indicator has been activated set up program P7 1 see page 34 the READY annunciator lights
18. PERATING INSTRUCTIONS OPERATING INSTRUC accumet 13636AP85 AP 3 Portable Waterproof pH Conductivity Meter CERTIFIED accumet accumet Table of Contents 1 IMtroduction ccssssssssccccccccssesssssnsnscceeecceeesesssssssscceeeecceceseessssssaaeeeeeeee 4 2 Display and keypad functions sccccccssccccscsccccscscccecssceceesceoseees 5 6 2 1 DDS oi EA E cassasesecsats cassaeassgsavecsevacsstaszeesiecazastaseiacstesessiagaivasescbessadevessracescsatvstaseates oatcensiads 5 2 2 Key Pad Cia hese aiaeasi ra Ha 6 3 Preparationr sssssscccccccccsccssssssssssneecceccsssssssssssssneeesecesssssssssnssneneeees 7 9 3 1 Inserting the batteries saci cccs seaicssssccscisesutescievsxsseseassa codseibevedavees ai on 7 3 2 Probe information soc c sezcacessescssecassatassseqsevecsseassveqsesacsstessiec secstascatasecsenseassseadeinssebsestasviseseess 8 9 4 Callilration csssccccccccccsssssssssnsceeccccceesessssssnsnceeeccesessesssssssaneeeeeees 10 16 4 1 Important information on meter calibration ccscssesccsessesseseeesseesesteseeseaeaneseeseenesnees 10 4 2 Preparing the meter fot calibrati01 i 2 01 000a ani 10 ASPI Calibre thorn A oaradntrnsla hoop on noha nre r nnn 11 12 4 4 Conductivity and TDS calibration errrrrrnrrnninnnnnn nn 13 15 4 5 Temperature calibr ti01 si firdasstin nf nn 16 5 Measuremen nt sssssssssssssssessssesceesseeecececccccceeccesss
19. Press Setup key to enter Set Up mode 3 Press the A and W keys to scroll through subgroups until you view parameter P3 0 See figure c 4 Press the ENTER key twice to select parameter 3 2 See figure D 5 Press the A and Y keys to select 2 3 4 or 5 point pH calibration 6 Press the ENTER key to confirm selection and to proceed to step 5 of P 3 3 Press the CAL MEAS key twice to return to measurement mode 29 P3 3 Selecting NIST or USA buffer sets Program P3 3 lets you select between the following calibration buffer sets USA pH 1 68 4 01 7 00 10 00 12 45 NIST pH 1 68 4 01 6 86 9 18 12 45 Factory default is the USA buffer set From measurement mode 1 Press the Mode key to select pH measurement mode 2 Press SET key to enter Set Up mode 3 Press the A and Y keys to scroll through subgroups until you view parameter P3 0 See figure 8 4 Press the ENTER key three times to select parameter 3 3 See figure Q 5 Press the A and W keys to toggle between USA and NIST buffer sets 6 Press the ENTER key to confirm selection and to proceed to step 5 of P 3 4 Press the CAL MEAS key to return to measurement mode 30 P3 4 Selecting C or F This meter lets you select between C and F units for temperature readings From measurement mode 1 Press the Mode key to select pH measurement mode 2 Press Setup key to enter Set Up mode 3 Press the A and W keys to scr
20. ature coefficient of your solution 7 Press the ENTER key to confirm selection and to proceed to step 4 of P 8 2 Press the CAL MEAS key twice to return to measurement mode Notes If you do not know the temperature coefficient of your solution you can determine the correct value using the formula in Appendix 3 Calculating Temperature Coefficients on page 49 P8 2 Selecting the normalization temperature EA P9 0 Resetting to factory default settings conductivity TDS Your meter will normalize its conductivity measurements to a standard temperature This program lets you reset all conductivity parameters to factory default settings that you can select You can adjust the normalization temperature from 15 to 30 C This clears all calibration data any other conductivity setup functions you might 59 to 86 F Meter default is 25 C 77 F have changed The following settings will remain as you have set them e Temperature unit of measure C or F e The temperature offset calibration value From measurement mode e All pH calibration data and parameters 1 Press the Mode key to select conductivity or TDS measurement mode From measurement mode SETUP MEAS 1 Press the Mode key to select 2 Press Setup key to enter conductivity measurement mode Set Up mode 3 Press the A and Y keys to scroll through subgroups until you view parameter P8 0 See figure D 2 Press Setup key to enter Set Up mode
21. curacy e If you are measuring in the mid ranges and you rinsed the probe in deionized water and stored it dry calibrate the meter at least once a month e If you take measurements at extreme temperatures calibrate the meter at least once a week Preparing for conductivity TDS calibration For best results select a calibration standard value close to the sample value you are measuring Alternatively use a calibration solution value that is approximately the full scale value of the measurement range you plan to use For example in the 0 to 1999 uS conductivity range use a 1413 pS solution for calibration See the table below for recommended calibration solution ranges press CAL MEAS to return to pH measurement mode See figure Q Notes To exit from pH Calibration mode without confirming calibration DO NOT press ENTER in step 6 Press CAL MEAS instead If the selected buffer value is not within 1 0 pH from the measured pH value the electrode and buffer icon blink and the ERR annunciator appears in the lower left corner of the display To limit the number of pH buffer values available during calibration see Set up program P3 2 on page 29 To select USA or NIST buffer sets see Set up program P3 3 on page 30 12 Conductivity Recommended TDS Recommended Range Cal Solution Range Range Cal Solution Range 0 00 19 99 uS 6 00 to 17 00 pS 0 00 9 99 ppm 3 00 to 8 50 ppm 0 0 199 9 uS 60 0 to 170 0 pS 1
22. ded Factor actual TDS Actual Conductivity 25 C y represents the conductivity to ppm relationship on average for naturally occurring fresh water 40 Na SO 40 NaHCO 20 NaCl 2 442 a formulation that most closel 3 TDS Your Material These columns are for you to write in your application specific conductivity to ppm values and conver sion factors for future reference 47 12 Appendix 2 Calculating TDS Conversion Factors You can calibrate your meter using TDS calibration standard solutions The calibra tion standard only needs to give the TDS value at a standard temperature such as 25 C To determine to the conductivity to TDS conversion factor use the following formula Factor Actual TDS Actual Conductivity 25 C Definitions Actual TDS Value from the solution bottle label or as a standard you make using high purity water and precisely weighed salts Actual Conductivity Value measured using a properly calibrated Conductivity Temperature meter Both the Actual TDS and the Actual Conductivity values must be in the same magnitude of units For example if the TDS value is in ppm the conductivity value must be in pS if the TDS value is in ppt the conductivity value must be in mS Check your factor by multiplying the conductivity reading by the factor in the above formula The result should be the TDS value 48 13 Appendix 3 Calculating Temperature Coefficients To determine the tem
23. e gently in the sample to create a homogenous sample 5 Allow time for the reading to stabilize Note the reading on the display If the Ready indicator is selected on it will appear when the reading is stable See page 20 for more information 6 Press the MODE key to toggle between pH and conductivity readings 17 Taking Conductivity or TDS Measurements To take readings 1 Rinse the probe with deionized or distilled water before use to remove any impurities adhering to the probe body Shake or air dry To avoid contamination or dilution of your sample rinse probe with a small volume of your sample liquid 2 Press ON to switch on meter 3 Press the MODE key to select conductivity or TDS measurement mode The MEAS annunciator appears on the top center of the LCD The ATC indicator appears in the lower right hand corner to indicate Automatic Temperature Compensation See figure Q NOTE For conductivity manual temperature compensation you must deactivate the temperature sensor built into the conductivity probe and set a manual temperature compensation value See pages 21 22 for directions The ATC indicator will disappear from the display Leave probe 4 Dip the probe into the sample guard on When dipping the probe into the during sample the tip of the probe must be measurement immersed above the second steel band Stir the probe gently in the sample to Immerse create a homogenous sample probe bey
24. ect pH electrode conductivity TDS temperature probe with BNC connector with 6 pin connector z locking ring top view of 6 pin connector conductivity TDS temperature probe 4 Calibration EJ mportant Information on Meter Calibration When you recalibrate your meter old calibration points are replaced on a point by point basis in pH and on a range by range basis in conductivity or TDS For example e pH if you previously calibrated your meter at pH 4 01 7 00 and 10 00 and you recalibrate at pH 7 00 the meter retains the old calibration data at pH 4 01 and pH 10 00 e Conductivity TDS if you previously calibrated your conductivity meter at 1413 pS in the 0 to 1999 uS range and you recalibrate at 1500 pS also in the 0 to 1999 pS range the meter will replace the old calibration data 1413 pS in that range The meter will retain all calibration data in other ranges TDS values are proportional to conductivity values If you calibrate a TDS value in an equivalent conductivity range the TDS value will replace the previous conductivity value and vice versa To view current calibration points e pH Program P1 0 in the SETUP section page 26 e Conductivity TDS Program P5 0 in the SETUP section page 33 To completely recalibrate your meter or when you use a replacement probe it is best to clear old calibration data by resetting the meter To reset the meter to its factory defaults e
25. emperature press the ENTER key The meter automatically returns to measurement mode Notes e You can offset the temperature reading up to 5 C from the original reading e To exit this program without confirming the temperature calibration value DO NOT press ENTER in step 7 Press CAL MEAS instead 16 5 Measurement BI Taking pH Measurements To take readings 1 Rinse the pH electrode with deionized or distilled water before use to remove any impurities adhering to the probe body If the pH electrode has dehydrated soak it for 30 minutes in electrode storage solution pH buffer or a 2M 4M KCI solution 2 Press ON to switch on meter 3 Press the MODE key to select pH measurement mode The MEAS annunciator appears on the top center of the LCD The ATC indicator appears in the lower right hand corner to indicate Automatic Temperature Compensation See figure Q NOTE For pH manual temperature compensation you must disconnect the conductivity cell from the 6 pin connector The ATC indicator will disappear from the display You also need to set a manual temperature compensation value see page 22 for directions 4 Dip the pH electrode into the sample Since the conductivity cell contains the temperature sensor make sure it is also immersed in your solution When dipping the probe into the sample the sensor or the glass bulb of the electrode must be completely immersed into the sample Stir the prob
26. fault no Retains your current settings 50 51
27. ill The advanced set up mode lets you customize your manually temperature compensate You can select any temperature between meter s preferences and defaults Your waterproof 0 and 100 C 32 and 212 F Default value is 25 C 77 F meter features different sub groups that organize all F set up parameters To select a manual temperature compensation value This meter blanks out sub groups that do not apply 1 Press the MODE key to select the meas to the measurement mode conductivity TDS or pH urement mode in which you need to use you are in when you enter Setup mode manual temperature compensation The full selection of available sub groups are 2 If necessary select ATC off pH sub groups pH see NOTE on page 17 Conductivity TDS see page 21 When ATC is off the ATC indicator disappears from the lower right corner of the display 3 Press the CAL MEAS key to enter calibration mode The CAL indicator will appear above the primary display Conductivity TDS sub groups See figure D 4 While in calibration mode press the MODE key to enter temperature calibration mode The primary display shows the current temperature setting and the secondary display shows the last set temperature value See figure E 5 Check the temperature of your sample using an accurate thermometer 1 P1 0 Viewing pH calibration data 2 P2 0 Viewing pH probe data 3 P3 0 pH configuration 4 P4 0 Resetting meter to factory default
28. lectrode Also you can store in a pH 4 buffer with 1 100 part of saturated KCI Other pH buffers are OK for storage but NEVER use deionized water for storage After measuring 1 Rinse the pH electrode and reference junction in deionized water 2 Store the electrode as recommended above in pH electrode storage or as recommended by the manufacturer 3 Prior to next use rinse the liquid junction with deionized water and blot dry never wipe electrode If this does not restore electrode to normal response see Reactivating the pH electrode section below pH electrode cleaning Salt deposits dissolve the deposits by immersing the electrode in tap water for ten to fifteen minutes Ten thoroughly rinse with distilled water Oil grease film wash electrode pH bulb gently in some detergent and water Rinse electrode tip with distilled water or use a general purpose electrode cleaner see page 40 for ordering information Clogged reference junction heat a diluted KCI solution to 60 to 80 C Place the sens ing part of the electrode into the heated solution for about 10 minutes Allow the electrode to cool in some unheated KCI solution Protein deposits prepare a 1 pepsin solution in 0 1 M of HCl Set the electrode in the solution for five to ten minutes Rinse the electrode with distilled water Reactivating the pH electrode If stored and cleaned properly your pH electrode should be ready for immediate use Ho
29. main menu ENTER Press to confirm values in Calibration mode and to confirm selections in Setup mode RANGE Press to switch to manual ranging in Conductivity or TDS mode A N ii Press in Setup mode to scroll through subgroups Also lets you increment decrement the values in the conductivity and temperature calibration modes SETUP piiss Press to enter SETUP mode SETUP mode lets you customize meter preferences and defaults and view calibration and probe data 3 Preparation Inserting the Batteries Four AAA batteries are included with your meter 1 Use a Phillips screwdriver to remove the two screws holding the battery cover See figure below 2 Lift off battery cover to expose batteries 3 Insert batteries Follow the diagram inside the cover for correct polarity 4 Replace the battery cover into its original position Screw cover back into place Remove these two screws to access battery compartment Battery compartment Probe information Your AP85 meter includes two probes e single junction epoxy body combination pH electrode with BNC connector e conductivity TDS temperature probe with a notched 6 pin connector The temperature sensing element built into the conductivity probe will also compensate for pH readings as long as both probes are in your solution at the same time If you want to use an All in One pH probe with a built in temperature element or if you
30. o measurement mode SETUP MEAS SETUP MEAS Notes To reset all conductivity and TDS data see page 41 See page 50 for a table of factory default settings 32 X4 P5 0 Viewing previous conductivity TDS calibration data This mode lets you recall previous conductivity or TDS calibration data which lets you know at which points this meter was previously calibrated This is a view only mode TDS values are proportional to conductivity values If you calibrate a TDS value in an equivalent conductivity range the TDS value will replace the previous conductivity value and vice versa From measurement mode 1 Press the Mode key to select conductivity or TDS measurement mode 2 Press the Set up key to enter Set Up mode See figure 8 3 Press the A and Y keys to scroll through subgroups until you view parameter P5 0 4 Press the ENTER key repeatedly to view previous calibration data Range Conductivity TDS P5 1 R1 0 00 19 99 pS 0 00 9 99 ppm P5 2 R2 0 0 199 9 uS 10 0 99 9 ppm P5 3 R3 0 1999 uS 100 999 ppm P5 4 R4 0 00 19 99 mS 1 00 9 99 ppt P5 5 R5 0 0 199 9mS 10 0 199 9 ppt See figure B 5 When you have scrolled through all calibration data you will automatically return to the subgroup menu Press the CAL MEAS key to return to measurement mode Notes If there is no previous calibration data at a particular point the primary display y will show
31. oll through subgroups until you view parameter P3 0 See figure O 4 Press the ENTER key four times to select parameter 3 4 See figure Q 5 Press the A and Y keys to toggle between C and F 6 Press the ENTER key to confirm selection and to return to the subgroup menu Press the CAL MEAS key to return to measurement mode Notes You can also switch between C and F in Program P7 2 available from conductivity TDS mode If you switch between C and F in pH mode the meter will also switch in conductivity mode 31 P4 0 Resetting to factory default settings pH This program lets you reset all pH parameters to factory default settings This clears all calibration data any other pH setup functions you might have changed The following settings will remain as you have set them e Temperature unit of measure C or F e The temperature offset calibration value e All conductivity TDS calibration data and parameters From measurement mode 1 Press the Mode key to select pH SENE MEAS measurement mode 2 Press Setup key to enter Set Up mode 3 Press the A and Y keys to scroll through subgroups until you view parameter P4 0 in the lower display See figure 4 Press the ENTER key See figure O 5 Press the A and Y keys to toggle between NO and YES e NO retains current settings e YES resets to factory default settings 6 Press the ENTER key to confirm selection and to return t
32. ond See figure B upper steel band 5 Allow time for the reading to stabilize Note the reading on the display If the Ready indicator is selected on it will appear when the reading is stable See page 20 for more information 6 Press the MODE key to toggle between conductivity and pH readings Notes You can use the conductivity TDS manual ranging function to select a specific range in which your readings will appear See page 20 for directions 18 HOLD function This feature lets you freeze your reading for a delayed observation HOLD can be used any time when in MEAS mode 1 To hold a measurement press the HOLD key while in measurement mode HOLD will appear on the display See figure c 2 To release the held value press HOLD again Continue to take measurements NOTE This meter shuts off automatically after 20 minutes of nonuse If the meter is shut off either automatically or manually the HOLD value will be lost Taking measurements with READY indicator selected on If the READY indicator has been activated the READY annunciator lights when the reading is stable Switch the READY indicator on or off in Set up program P7 1 see page 35 for directions Taking measurements with the auto endpoint feature selected on When a reading is stable for more than 5 seconds the auto endpoint feature will automatically hold the reading The hold indicator appears on the
33. onductivity or TDS mode you must 1 Deactivate the temperature element built into the conductivity TDS probe 2 Select a manual temperature compensation value see page 22 You can deactivate the temperature element select manual temperature compensa tion in Set Up Program P7 3 From measurement mode 1 Press the Mode key to select conductivity measurement mode 2 Press Setup key to enter Set Up mode 3 Press the A and Y keys to scroll through subgroups until you view parameter P7 0 See figure Q 4 Press the ENTER key three times to select parameter 7 3 The upper display shows ATC and the lower display shows P7 3 See figure O 5 Press the ENTER key again The upper display shows ATC and the lower display shows YES or NO 6 Press the A and Y keys to select the Automatic Temperature Compensation off e YES ATC on e NO ATC off manual compensation See figure c 7 Press the ENTER key to confirm selection and to return to the sub group menu Press the CAL MEAS key to return to measurement mode Note that the ATC indicator no longer appears on the display Go to page 22 to select a manual temperature compensation value 21 Selecting the manual temperature compensation value 6 Advanced set up functions To use manual temperature compensation you need to enter the temperature value of your process into the meter This is the value at which readings w
34. ons or Probe Maintenance section Battery Low battery level Need new batteries Clean battery contacts indicator blinks or battery connection is bad Replace batteries with fresh ones noting polarity If error persists or the meter shows incorrect values return the meter For a complete diagram of the display see page 4 45 10 Specifications Mode pH Temperature Conductivity TDS 0 to 19 99 nS 0 00 to 9 99 ppm 2 00 to 10 0 to 0 to 199 9 uS 10 0 to 99 9 ppm Range 16 00 pH 110 0 C 0 to 1999 uS 100 to 999 ppm 14 0 to 230 0 F Oto 19 99 mS 1 00 to 9 99 ppt 0 to 199 9 mS 10 0 to 199 9 ppt 0 01 pS 0 1 HS 0 01 ppm 0 1 ppm Resolution 0 01 pH 0 1 C or F 1 uS 0 01 mS 1ppm 0 01 ppt 0 1 mS 0 1 ppt Accuracy 0 01 pH 0 5 C or F 1 full scale 1 full scale up to 5 points offset in 0 1 up to 5 points up to 5 points Calibration pH 1 68 4 01 increments one point one point 7 00 10 01 12 45 up to 5 per range per range pH slope 80 to 110 pH buffer selection choose from two buffer sets USA pH 1 68 4 01 7 00 10 00 12 45 NIST pH 1 68 4 01 6 86 9 18 12 45 Conductivity cell constant K 1 0 Conductivity TDS temperature coefficient adjustable from 0 0 to 10 0 per C Conductivity TDS normalization temperature adjustable from 15 to 30 C 59 to 86 F Conductivity to TDS conversion factor adjustable from 0 4 to 1 0 Temperature compensa
35. pH Program P4 0 in the SETUP section page 32 e Conductivity TDS Program P9 0 in the SETUP section page 41 NOTE Resetting the meter will set meter to factory defaults pH and Conductivity TDS must be reset separately For directions on how to calibrate your meter See section 4 3 on pages 11 12 for pH calibration See section 4 4 on page 13 15 for conductivity and TDS calibration See section 4 5 on page 16 for Temperature Calibration Preparing the Meter for Calibration Before starting calibration make sure you are in the correct measurement mode When you switch on the meter the meter starts up in the units last used For example if you shut the meter off in pH units the meter will read pH units when you switch the meter on Do not reuse calibration solutions after calibration Contaminants in the solution can affect the calibration and eventually the accuracy of the measurements 10 pH calibration We recommend that you calibrate at least two buffers that bracket one above and one below your expected sample range Preparing for pH calibration This meter can calibrate up to 5 pH buffer values to ensure accuracy across the entire PH range Select from the following buffer options USA pH 1 68 4 01 7 00 10 00 12 45 NIST pH 1 68 4 01 6 86 9 18 12 45 The meter automatically recognizes these standard buffer values which makes pH calibration faster and easier See Set up program P3 3 on page 30 fo
36. perature coefficient of your sample solution use this formula Cro Cr Cri T2 25 Cr T 25 TC Temperature coefficient TC 100x Cy Conductivity at Temp 1 Cy Conductivity at Temp 2 T Temp 1 in C T Temp 2 in C 25 25 C NOTE A controlled temperature water bath is ideal for this procedure 1 Immerse the probe into a sample of your solution and adjust the temperature coefficient to 0 that is no compensation by performing the following A From conductivity measurement mode press the SETUP key B Press the A key until the lower display reads P8 0 C Press the ENTER key twice The lower display reads tCO and the upper display shows the temperature coefficient value D Press the W key until the upper display shows 0 0 E Press ENTER key to confirm the value F Press CAL MEAS key twice to return to measurement mode 2 Wait for 5 minutes Note T and Cy conductivity at T4 3 Condition the sample solution and probe to a temperature T that is about 5 C to 10 C different from Ty and note the conductivity reading Cy NOTE Record your results for future reference Ideally T and T should bracket your measurement temperature and should not differ by more than 5 C 4 Calculate the temperature coefficient of your solution according to the formula shown above 5 Enter the temperature coefficient you calculated into the meter A From conductivity measurement mode press the SETUP key
37. ponding to key press a HOLD mode in operation b Damaged key pad c Internal program error a Cancel HOLD mode b Return to dealer c Reset all internal programs by reinserting batteries Unstable readings a Air bubbles in probe b Dirty probe c Probe not deep enough in sample d External noise pickup or induction caused by nearby electric motor e Broken probe a Tap probe to remove bubbles b Clean the probe and recalibrate c Make sure sample entirely covers the probe sensor s d Move or switch off interfering motor e Replace probe OR on upper display a Probe is shorted b Probe is in an out of range solution c Broken probe a Test probe Make sure probe is fully connected to meter b Use different solution c Replace probe Temperature reading erratic or lower display reads OR a Temperature of solution is out of range a Heat or cool solution Slow response 44 a Dirty Oily probe a Clean probe See Probe Care amp Maintenance pages 42 43 9 Error Messages LCD Indicates Cause Solution Display Err Unrecognized input Wrong input in Release key Select annunciator from keypad selected mode valid operations depending on mode CAL amp Err Calibration error Wrong value input Check your input value annunciators at calibration clean probe blink Dirty probe See Calibration secti
38. r directions on how to select USA or NIST buffer sets Be sure to remove the protective electrode storage bottle or rubber cap of the probe before calibration or measurement If the electrode has been stored dry rehydrate the probe in tap water for 10 minutes before use to saturate the pH electrode surface and minimize drift Rinse your probe in deionized water after use and store in electrode storage solution DO NOT store in deionized water If storage solution is not available use pH 4 0 or 7 0 buffer To calibrate pH 1 If necessary press the MODE key to select pH measurement mode The pH indicator appears in the upper right hand corner of the display See figure Q 2 Rinse the pH electrode thoroughly with deionized water or a rinse solution Do not wipe the probe this causes a build up of electrostatic charge on the glass surface 3 Dip the pH electrode into the calibration buffer The end of the probe must be com pletely immersed into the sample Stir the probe gently to create a homogeneous sample NOTE The temperature element is in the conductivity cell For temperature compensated readings dip the conductivity cell into the calibration buffer as well CONTINUED ON NEXT PAGE 11 4 Press CAL MEAS to enter pH calibra tion mode The CAL indicator lights The primary display will show the measured reading while the smaller secondary display will indicate the PH standard buffer solution See figure
39. ration P7 1 Ready indicator on or off auto endpoint on or off P7 2 Select F or C P7 3 Select ATC Manual Temperature Compensation P7 4 Set TDS factor Instructions on page 41 P8 0 Temperature parameters P8 1 Set temperature coefficient P8 2 Set normalization temperature P9 0 Reset to factory default Con TDS Reset conductivity data to factory default settings 25 P1 0 Viewing previous pH calibration data This mode lets you recall previous pH calibration data which lets you know at which points this meter was previously calibrated This is a view only mode From measurement mode 1 Press the Mode key to select pH measurement mode 2 Press the Set up key to enter Set Up mode 3 Press the A and Y keys to scroll through subgroups until you view parameter P1 0 See figure Q 4 Press the ENTER key repeatedly to view previous calibration data P1 1 pH 1 68 P1 2 pH 4 01 P1 3 pH 7 00 USA pH 6 86 NIST P1 4 pH 10 00 USA pH 9 18 NIST P1 5 pH 12 45 See figure B 5 When you have scrolled through all calibration data you will automatically return to the subgroup menu Press the CAL MEAS key to return to measurement mode Notes If there is no previous calibration data at a particular point the primary dis uy play will show See figure QO See Set up Program P3 3 page 30 for information on selecting USA or NIST pH buffer sets
40. shows ATC and the lower display shows YES or NO See figure O 6 Press the A and W keys to select the Automatic Temperature Compensation on of off e YES ATC on e NO ATC off manual compensation 7 Press the ENTER key to confirm selection and to proceed to step 4 of P7 4 menu Press the CAL MEAS key twice to return to measurement mode 37 P7 4 Setting the TDS factor As the concentration of dissolved salts in solution increases the conductivity increases This relationship varies from salt to salt and is roughly linear over a given range for a given salt The TDS conversion factor is used by the meter to convert conductivity to TDS It is important to use the appropriate TDS factor for accurate TDS values To determine the conductivity to TDS conversion factor for your solution e Appendix 1 on page 47 lists some commonly used conversion factors e Appendix 2 on page 48 describes how to calculate the TDS conversion factor for other solutions You can set the TDS conversion factor between 0 4 and 1 0 meter default is 0 5 From measurement mode 1 Press the Mode key to select conductivity or TDS measurement mode 2 Press Setup key to enter Set Up mode 3 Press the A and Y keys to scroll through subgroups until you view parameter P7 0 See figure H 4 Press the ENTER key five times to select parameter 7 4 The upper display shows tdS and the lower display shows P7 4
41. soassaassasseeseeees 17 22 5 1 Taking pH measurements piesn ena Aie aies ei ates 17 5 2 Taking conductivity or TDS measurements ccccceseesecsesseeteseeseeseeesteseeseaeaneseereeneanens 18 5 3 HOLD function Ready indicator Auto endpoint rssrsersrrrinrninonnononnov nosov 19 5 4 Using manual ranging function conductivity TDS esserrnnnnnonnnn nn 20 5 5 Selecting manual temperature compensation conductivity TDS esrrerrernnnim 21 5 6 Selecting the manual temperature compensation value rrrrnrrnnnnnnnnn 22 6 Advanced setup functions cccccssscccssscccscescesecscceccssesceesceees 23 41 6 1 Advanced setup mode Overviews ce a 24 25 POEM EE T E E E E 24 Coriductivity TDS E r a sl hla nl 25 6 2 Program 1 0 Viewing previous pH calibration data ersersrrnrninnnnnnnnnnn 26 6 3 Program 2 0 Viewing pH electrode data slope and offset ersernrnrrnnnnnemu 27 6 4 Program 3 0 pH measurement configuration rrrrrornnnnnnnn nn 28 30 P3 1 Selecting Ready indicator auto endpoint function ererrrrrnninnnnnnn 28 P3 2 Selecting number of pH calibration points ersrrnrnnnnnnnnnnnn nn 29 P3 3 Selecting USA or NIST buffer sets 0 ceccescsssssecsesesseeseesssencenesecenesesnecnesnensensenens 30 P3 4 Selecting C or F 6 5 Program 4 0 Resetting to factory default settings PH
42. ssary press the MODE key to select TDS mode See figure Q 2 Rinse the probe with de ionized water or a rinse solution then rinse with a small amount of calibration standard 3 Dip the probe into the calibration standard Immerse the probe tip beyond the upper steel band Stir the probe gently Leave probe guard on to create a homogeneous sample during See figure B measurement 4 Wait for the measured TDS value to Immerse stabilize If the READY indicator has probe beyond upper steel been activated set up program P7 1 bana see page 34 the READY annunciator lights when the reading is stable 5 Press CAL MEAS to enter TDS calibration mode The CAL indicator will appear above the display See figure Q 6 Press the A or W keys to change the value on the primary display to match the value of the calibration standard The secondary display shows the factory calibrated value See figure D 7 Press ENTER to confirm the calibration value The meter returns to the MEAS measurement mode 8 Repeat steps 1 7 for other ranges Notes e When entering calibration mode the meter will display the factory default value If the meter was previously calibrated the display may jump to the factory default value when switching from measurement to calibration mode e To exit from TDS Calibration mode without confirming calibration DO NOT press ENTER in step 7 Press CAL MEAS instead This will
43. ssesossesossesossesoosesosseeeossesoseseesss 46 11 Appendix 1 conductivity to TDS conversion factors sssosoossos 47 12 Appendix 2 calculating TDS conversion factors cccccsssecseeee 48 13 Appendix 3 calculating temperature coefficients sceceeeee 49 14 Appendix 4 meter factory default settings ccccccssccsscscceeeees 50 3 1 Introduction Thank you for selecting an accumet AP85 meter This portable meter is a microprocessor based instrument that measures pH conductivity Total Dissolved Solids TDS and temperature Your meter has many user friendly features all of which are accessible through the membrane keypad Your meter includes a single junction pH electrode a combination conductivity temperature probe and batteries Please read this manual thoroughly before operating your meter AP85 pH Conductivity C F Meter Fisher Scientific 2 Display and Keypad Functions Display The LCD has a primary and secondary display e The primary display shows the measured pH or conductivity reading e The secondary display shows the temperature of the reading The display also shows error messages keypad functions and program functions Primary display K 1 SETUP mode indicator 7 Parts per thousand 12 ERRor indicator 2 MEASurement mode indicator TDS 13 Low battery indicator indicator 8 a a o 14 Probe indicator bos Bead indicator
44. tion automatic or manual from 0 to 100 C 32 to 212 F Display dual LCD Operating temperature 0 to 50 C 32 to 122 F Power four 1 5 V AAA batteries included Battery life gt 200 hours continuous use Probe connectors pH mV BNC connector Conductivity TDS Temperature notched six pin connector Dimensions Meter 7 5 L x 3 5 W x 1 75 H 19 1 cm x 8 9 cm x 4 5 cm Boxed 9 2 L x 9 2 W x 2 75 H 23 cm x 23 cm x 7 cm Probe 6 8 L x 1 3 dia 17 3 cm L x 3 2 cm dia Weight Meter 1 0 Ib 0 5 kg Boxed 2 0 Ibs 0 9 kg 46 O 20 LL c 2 77 m w gt c jo UO ia A O _ me gej c jo UO 11 Appendix 1 TDS 442 2 TDS Your Material TDS KCI TDS NaCl Conductivity at 25 C Factor Factor ppm Factor 1 ppm Factor ppm ppm Value Value Value Value 0 6563 0 6712 0 7078 0 7000 0 8478 50 50 300 0 1000 1050 7608 0 4755 0 4822 0 4969 0 4914 0 5000 0 5613 0 5688 0 6048 38 04 215 5 702 1 0 5048 0 5047 0 5270 0 5047 0 5685 0 5782 0 5839 0 6521 40 38 84 uS 447 uS 1413 pS 1500 HS 8974 uS 12880 HS 225 6 744 7 737 1 757 1 4487 5101 7447 8759 0 8825 0 8970 0 9961 11 367 13 455 79 688 7230 8532 15000 pS 48 384 52 168 80 mS 1 Factor the conductivity to ppm TDS conversion factor Multiply conductivity by this factor to get ppm TDS for the type of TDS reading nee
45. trode slope 100 0 No slope adjustment P3 1 Ready indicator Ready on Ready indicator on auto endpoint off P3 2 pH cal points 3 3 pH calibration points available 1 5 point range P3 3 USA or NIST buffers USA USA buffers pH 1 68 4 01 7 00 10 01 12 45 P3 4 For C no default F or C remains as selected P4 0 pH factory default no Retains your current settings Conductivity TDS parameters P5 1 Viewing con TDS No cal data for R1 0 00 19 99 uS 0 00 9 99 ppm P5 2 calibration data No cal data for R2 0 0 199 9 uS 10 0 99 9 ppm P5 3 2 No cal data for R3 0 1999 S 100 999 ppm P5 4 No cal data for R4 0 00 19 99 mS 1 00 9 99 ppt P5 5 gt No cal data for R5 0 0 199 9 mS 10 0 199 9 ppt P6 1 Viewing con TDS 1 000 No offset for R1 0 00 19 99 us 0 00 9 99 ppm P6 2 calibration data 1 000 No offset for R2 0 0 199 9 S 10 0 99 9 ppm P6 3 1 000 No offset for R3 0 1999 1S 100 999 ppm P6 4 1 000 No offset for R4 0 00 19 99 mS 1 00 9 99 ppt P6 5 1 000 No offset for R5 0 0 199 9 mS 10 0 199 9 ppt P7 1 Ready indicator Ready on Ready indicator on auto endpoint off P7 2 For C no default F or C remains as selected P7 3 ATC on or off ATC on Automatic Temperature Compensation on P7 4 Set TDS factor 0 5 Adjustable from 0 4 to 1 0 P8 1 Temp coefficient 2 1 per C Adjustable from 0 to 10 per C P8 2 Normalization temp 25 C Adjustable from 15 to 30 C 59 to 86 F P9 0 factory de
46. wever a dehydrated bulb may cause sluggish or erratic response To rehydrate the bulb immerse the electrode in a pH 4 buffer solution for 10 to 30 minutes If this fails the electrode requires activation Never touch or rub glass bulb Contact builds up an electrostatic charge CONTINUED ON NEXT PAGE 42 pH electrode activation for glass bodied electrodes only WARNING Only qualified persons proficient with the safe handling of dangerous chemicals should perform the procedure below Provide proper containers fume hoods ventilation and waste disposal Safety goggles and protective clothing must be worn while performing this procedure If possible replace with another electrode instead of performing this reactivation procedure 1 Dip or stir the pH electrode in alcohol for 5 minutes 2 Rinse and leave the electrode in tap water for 15 minutes 3 Dip and stir the electrode in concentrated acid such as HCI or H SO for 5 minutes 4 Repeat step 2 5 Dip and stir in strong base NaOH for five minutes 6 Rinse and leave for 15 minutes in distilled or deionized water 7 Now test with standard calibration buffer solutions to see if the electrode yields acceptable results Repeat step 3 through 6 up to three times for better response If the response does not improve then the electrode is no longer functioning Replace with a new electrode Conductivity TDS probe care Keep the conductivity TDS probe clean Rinse the probe t
47. when the reading is stable 5 Press CAL MEAS to enter conductivity calibration mode The CAL indicator will appear above the display See figure 6 Press the A or Y to change the value on the primary display to match the value of the calibration standard The secondary display shows the factory calibrated value See figure D 7 Press ENTER to confirm the calibra tion value The meter returns to the MEAS measurement mode 8 Repeat steps 1 7 for other ranges Notes When entering calibration mode the meter will display the factory default value If the meter was previously calibrated the display may jump to the factory default value when switching from measurement to calibration mode To exit from Conductivity Calibration mode without confirming calibration DO NOT press ENTER in step 7 Press CAL MEAS instead This will retain the old calibration data in the measuring range of the calibration You can offset the conductivity reading up to 40 from the default setting If your measured value differs by more than 40 clean or replace probe as needed 14 Calibrating for TDS directly The factory default setting for TDS conversion factor is 0 5 If your solution has a different TDS factor you can improve calibration accuracy by setting the TDS factor prior to calibration See SetUp Program P7 4 on page 38 for directions See Appendixes 1 and 2 on pages 47 48 to determine your exact TDS factor 1 If nece
48. wice and gently swirl it while you take readings For best accuracy soak a dry probe for at least 5 to 10 minutes or longer before calibration Rinse the probe with deionized or tap water before storing Never scratch the platinum portions with a hard substance Do not strike the probe against any hard surface Do not make continuous contact with your solutions Readings will rise over a period of time while you soak your probe locking notch Do not immerse the probe in oily solutions Clean probe thoroughly by stirring it in a mild detergent bath or isopropyl alcohol Wipe the probe with a soft tissue paper Rinse thoroughly in tap water and then in deionized water Recalibrate the meter after cleaning the probe twist b The conductivity TDS probe included with your meter pecs features a removable probe guard to make cleaning easy clockwise To remove probe guard to remove 1 Grip yellow probe guard and twist clockwise The locking notch will release 2 Slide probe guard off end of probe 3 Clean and reattach probe guard before use 43 8 Troubleshooting Problem Cause Solution Power on but no display a Batteries not in place b Batteries not in correct polarity and c Weak batteries d Automatic shutoff a Check that batteries are in place and making good contact b Reinsert batteries with correct polarity c Replace batteries d Power meter on again Not res

AP85 Portable Waterproof pH/Conductivity Meter

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