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pH 502 & mV 602 Series

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1. CONTACT 2 N ALARM F yk N iU pE FUSE Hi NN ANALOG RECORDER 6 INIT HAMOd X METER 4 20 mA Pt 100 PROBE pH PRE Note Note e Power Supply Connect a 3 wire power cable L to the terminal strip while paying attention to the correct line L earth PE and neu tral N terminal connections PE Power 115 Vac 100 mA 230 Vac 50 mA Line Contact fused inside 400mA PE must be connected to ground leakage current 1 mA e Electrode Connect the pH or ORP electrode to the BNC socket 10 at page 7 To benefit from the differential input connect the proper electrode wire if available or a cable with a potential matching pin grounding po TENTIAL MATCHING B bar to the relevant termi nal 9 at page 7 SOO Z When itis not possible to immerse the Potential Matching Pin together with the pH electrode in the solution disable the differential input by connecting the Connection for Potential Matching Pin 9 page 7 with the Connection for Electrode Reference 8 on page POTENTIAL MATCHING S 7 with a jumper wire ELECTRODE REFERENCE e Pt 100 Terminals these contacts 7 at page 7 connect the Pt 100 temperature sensor for automatic temper
2. BL PUMPS Dosing pumps with flow rate from 1 5 to 20 lph HI 98501 ChecktempC Electronic thermometer range 50 0 to 150 0 C All Hanna Instruments meters are guaranteed for two HI 98502 ChecktempF Electronic thermometer range 58 0 to 302 F years against defects in workmanship and materials when used for their intended purpose and maintained accord HI 6050 amp HI 6051 Submersible electrode holders ing to instructions The electrodes and the probes are HI 6054 amp HI 6057 Electrode holders for in line applications guaranteed for a period of six months This warranty is HI 778P Screened coaxial cable with screw connectors limited to repair or replacement free of charge HI 7871 amp HI 7873 Level controllers Damage due to accident misuse tampering or lack of HI 8427 pH ORP electrode simulator prescribed maintenance are not covered HI 8614 pH transmitter If service is required contact the dealer from whom you HI 8614L RT purchased the instrument If under warranty report the i model number date of purchase serial number and the HI 8615 ORP transmitter nature of the failure If the repair is not covered by the HI 8615L ORP transmitter with LCD warranty you will be notified of the charges incurred If the HI 92500 Windows compatible software instrument is to be returned to Hanna Instruments first ob HI 931001 pH ORP electrode simulator with LCD ng Rerumed in number Horn the i Customer Service department and then send it with ship
3. 88570060 Egypt Tel amp Fax 02 2758 683 Germany Tel 07851 9129 0 Fax 07851 9129 99 Greece Tel 210 823 5192 Fax 210 884 0210 Indonesia Tel 21 4584 2941 Fax 21 4584 2942 Japan Tel 03 3258 9565 Fax 03 3258 9567 Korea Tel 02 2278 5147 Fax 02 2264 1729 Malaysia Tel 603 5638 9940 Fax 603 5638 9829 Singapore Tel 6296 7118 Fax 6291 6906 South Africa Tel 011 615 6076 Fax 011 615 8582 Taiwan Tel 2 619 0285 Fax 2 619 0284 Thailand Tel 66 619 0708 Fax 66 2619 0061 United Kingdom Tel 01525 850 855 Fax 01525 853 668 USA Tel 401 765 7500 Fax 401 765 7575 For additional Technical Support in your local language see www hannainst com MANPHSO2R1 08 05 72
4. in ON OFF mode or in PID mode but in the latter case only if the relay is always ON This parameter can be set through setup procedure When the maximum boundary is reached an alarm is generated device stays in alarm condition until relay is de energized ON OFF CONTROL MODE Note Either for mode 1 or 2 base or acid dosage the user has to define the following values through setup Electromechanical Relay e relay setpoint pH mV value e relay hysteresis pH mV value CONTACT 1 Connect your device to the COM and NO Normally Open or NC Normally Closed terminals CONTACT 1 e Solid State Relay T Bl e NC NO Com NO Com The NC contact is available with electromechanical relays only The ON relay state occurs when relay is energized NO and COM connected NC and COM disconnected The OFF relay state occurs when relay is de energized NO and COM disconnected NC and COM connected The following graphs show relay states along with pH mea sured value similar graph can be derived for mV control As shown below a high setpoint relay is activated when the measured pH exceeds the setpoint and is deactivated when it is below the setpoint value minus hysteresis ON OFF gt Setpoint Setpoint 14 Hysteresis Such a behavior is suitable to control an acid dosing pump A low setpoint relay as can be seen from the following graphs is energized wh
5. with its 2 digit process ID number followed by e ACK Hex 06 If the controller recognizes the received command and performs the requested task e STX Hex 02 Data ETX Hex 03 If the received command is a request of data e NAK Hex 15 If the received command is not recognized e g the syntax is wrong e CAN Hex 18 If the controller cannot answer the request e g the password was not sent the controller is in setup mode the setup item is not available in that model etc Note The controller answers to the GET command with the same data format explained in the SET command Following are examples of answers 1 03 lt STX gt 01200 lt ETX gt The controller with process ID number 03 says that its current setpoint is 1 200mV 2 01 lt STX gt UP50232320 lt ETX gt The controller with process ID number 01 says that it is a pH502323 model with firmware release 2 0 The time out for the first character of the controller answer is 2 seconds except answers to PHR MVR and TMR as ex plained below The minum delay between the last received character and first character of the answer is 15 ms The time out for the complete controller answer to the PHR MVR and TMR commands is 30 ms at 9600 bps 40 ms at 4800 bps 60 ms at 2400 bps 90 ms at 1200 bps When the controller answers to the PHR MVR and TMR com mands the reading is sent as ASCII string followed by a character indicating the con
6. 0 mins no 21 Relay 2 mode M2 same as relay 1 0 no Available only in models with two relays Code Valid Values Default PW 22 Relay 2 setpoint S2 0 00 to 14 00 pH 6 00 pH no 2000 to 2000 mV 500 mV 23 Relay 2 hysteresis H2 0 00 to 14 00 pH 1 pH no 0 to 4000 mV 50 mV 24 Relay 2 deviation D2 0 50 to 14 00 pH 1 pH no 25 to 4000 mV 50 mV 25 Relay 2 reset time 0 1 to 999 9 minutes 999 9 mins no 26 Relay 2 rate time 0 0 to 999 9 minutes 0 0 mins no 30 Relay 3 high alarm HA 0 00 to 14 00 pH 9 00 pH no 2000 to 2000 mV 600 mV HA gt LA HA gt S1 or HA gt S2 31 Relay 3 low alarm LA 0 00 to 14 00 pH 5 00 pH no 2000 to 2000 mV 600 mV LA lt HA LA lt S1 or LA lt S2 32 Proportional control 1 to 30 min models w o SSR 5 min no mode period 5 s to 30 min models with SSR 30 s no 33 Maximum relay ON time 1 to 60 min 60 no after which an alarm mode is entered 34 Alarm mask time 00 00 to 30 00 mm ss 00 00 no 40 Analog output selection 0 0 1mA 2 no 1 0 20 mA 2 4 20 mA 3 0 5 VDC 4 1 5 VDC 5 0 10 VDC 41 Analog output 0 00 to 13 00 pH 0 00 pH no lower limit 2000 to 2000 mV 2000 mV 0 VARMIN 0_VARMIN lt 0 VARMAX 1 00pH or 50mV 42 Analog output 1 00 to 14 00 pH 14 00 pH no upper limit 2000 to 2000 mV 2000 mV 0_ VARMAX 0_VARMIN lt 0 VARMAX 1 00pH or 50mV Note Code Valid Values Default PW 60 Current day 01 to 31 from RTC no 61 Current
7. HI 7074 inorganic cleaning solution for 15 minutes Oil grease Rinse with Hanna HI 7077 Oil amp Fat cleaning solution Inorganic Atter performing any of the cleaning procedures rinse the electrode thoroughly with distilled water drain and refill the reference chamber with fresh electrolyte not necessary for gel filled electrodes and soak the electrode in HI 70300 storage solution for at least 1 hour before reinstalling it Evaluate your electrode performance based on the following e Noise Readings fluctuate up and down could be due to Clogged Dirty Junction refer to the Cleaning Procedure above Loss of shielding due to low electrolyte level in refillable electrodes only refill with HI 7071 for single junction or HI 7082 for double junction electrodes Dry Membrane Junction soak in HI 70300 storage solu tion for at least 1 hour Check to make sure the installation is such as to create a well for the electrode bulb to con stantly remain moist Drifting soak the electrode tip in warm HI 7082 solution for one hour and rinse tip with distilled water refill with fresh HI 7071 for single junction electrodes and HI 7082 for double junction electrodes if necessary Low Slope refer to the cleaning procedure above 59 60 Note e No Slope Check the electrode for cracks in glass stem or bulb replace the electrode if cracks are found Make sure cable and connections are not damaged nor lying in
8. HI 931002 4 20 mA simulator ping costs prepaid When shipping any instrument make sure it is properly packaged for complete protection Hanna Instruments reserves the right to modify the design construction and appearance of its products without ad vance notice 68 69 CE DECLARATION OF CONFORMITY 70 MIEN instruments DECLARATION OF CONFORMITY We Hanna Instruments Italia Srl via E Fermi 10 35030 Sarmcola di Rubano PD ITALY herewith certify that the microprocessor based process controllers pH 502113 pH502123 pH 502213 pH 502223 pH 502321 pH 502322 pH 5023202 pH 502323 pH 502421 pH 502422 pH 502423 pH 502423 mV 602112 mV 602115 mV 602123 mV 602321 mV 602322 mV 602323 mV 602523 have been tested and found to be in compliance with EMC Directive 89 336 EEC and Low Voltage Directive 73 23 EEC according to the following applicable normatives EN 50082 1 Electromagnetic Compatibility Generic Immunity Standard TEC 801 2 Electrostatic Discharge TEC 801 3 RF Radiated IEC 801 4 Fast Transient EN 50081 1 Electromagnetic Compatibility Generic Emission Standard EN 55022 Radiated Class B EN61010 1 Safety requirements for electrical equipment for measurement control and laboratory use 2 Oe P Cesa Technical Director On behalf of Date of Issue 25 1 1999 Recommendations for Users Before using these products make sure that they are entirely
9. Max slope 3 pH 5 mins 0 6 Tx pH min Time delay Tx approx 7 mins Deviation Tx 0 6 4 2 pH Ti Tx 0 4 17 5 mins Td Tx 0 4 2 8 mins To time ALARM RELAY Note The alarm relay functions in the following manner FSe NO Normally Open Energized Relay COM FSe0 NC Normally Closed De energized Relay During alarm condition the relay is de energized When not in alarm condition the relay is energized Example High alarm set at 10 pH Low alarm set at 4 pH Alarm Relay De energize Alarm A v Energized No Alarm 0 Al 98 10 1 oh An hysteresis will eliminate the possibility of continuous sequences energizing de energizing of the alarm relay when the mea sured value is close to the alarm setpoint The hysteresis amplitude is 0 2 pH in pH502 and 30 mV in mV602 Moreover the alarm signal is generated only after a user select able time period alarm mask has elapsed since the controlled value has overtaken one alarm threshold This additional fea ture will avoid fake or temporary alarm conditions If the power supply is interrupted the relay is de energized as if in alarm condition to alert the operator In addition to the user selectable alarm relays all pH 502 and mV 602 models are equipped with the Fail Safe alarm feature The Fail Safe feature protects the process against critical errors arising from power interruptions surges and human errors This sophist
10. PG13 5 thread double junction Pt glass body polymer filled PG13 5 THREAD DIA 12 mm 4 jE Sa lt 30 mm gt 110 mm HI 3210T Screw connector external PG13 5 thread double junction Pt plastic body cloth junction PG13 5 THREAD DIA 12 mm 4 fel om 30 mm gt 110 mm HI 3211T Screw connector external PG13 5 thread double junction Pt plastic body PVDF junction polymer filled PG13 5 THREAD DIA 12 mm 30 mm HI 2930B 5 BNC connector 5 m 16 5 cable double junction Pt plas tic body with built in amplifier and external thread cloth junction 3 4x16 UNF N T i DIA 20 5 mm AWN se tl I Api 110 mm HI 2931B 5 BNC connector 5 m 16 5 cable double junction Pt plas tic body with built in amplifier and external thread PVDF junction polymer tilled DIA 12 mm 3 4x16 UNF S DIA 12 mm gt DIA 20 5 mm ex x q i nn 110 mm 38 5mm HI 3090B 5 BNC connector 5 m 16 5 cable double junction Pt glass body polymer tilled 65 DIA 12 mm HI 32 10B 5 BNC connector 5 m 16 5 cable double junction Pt plas tic body PVDF junction polymer tilled ak DIA 12 mm 4 38 5 mm ng Sa z GOLD ORP ELECTRODES HI 4932B 5 BNC connector 5 m 16 5 cable double junction Au plastic body with built i
11. Reference Only available with refillable electrodes For industrial applications gel filled electrodes are preferable due to lesser maintenance requirements Remove the protective cap DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT This is normal with electrodes and they will disappear when rinsed with water During transport tiny bubbles of air may have formed inside the glass bulb The electrode cannot function properly under these conditions These bubbles can be removed by shaking down the electrode as you would do with a glass thermom eter 57 For refillable electrodes For AmpHel electrodes TEST MEASUREMENT STORAGE Note If the bulb and or junction are dry soak the electrode in HI70300 storage solution for at least one hour If the refill solution electrolyte is more than 2 2 cm 1 below the fill hole add HI 7082 3 5M KCI electrolyte solu tion for double junction or HI 7071 3 5M KCI AgCl electrolyte solution for single junction electrodes If the electrode does not respond to pH changes the battery is run down and the electrode should be replaced Rinse the electrode tip with distilled water Immerse the tip bottom 4 cm 1 2 in the sample and stir gently for approximately 30 seconds For a faster response and to avoid cross contamination of the samples rinse the electrode tip with the solution to be tested before taking your measurements To minimize clog
12. S1 gt 2 S2 D2 gt LA HA gt S1 D1 fMI 4 andM2 3 then S2 gt S1 S1 D1 gt LA HA gt S2 D2 For pH5025YZ and mV6025YZ only If M1 1 then S1 D1 lt HA EMI 2 then S1 D1 gt LA where the minimum deviation D1 or D2 is 0 5 pH for pH502 or 25 mV for mV602 The password cannot be viewed when SETUP is pressed with out entering the original password first The default password is set at 0000 In the event that the user forgets the pass word this can be reset to 0000 by pressing and holding CFM and then pressing LCD and CAL DATA at the same time when the pH controller is in normal operating mode idle or control with measurement displaying AAs When a wrong setup value is con firmed the pH controller does not skip to the next setup item but remains in the current item displaying a flashing WRONG indicator until the param eter value is changed by the user the same is also true for the setup code selection In some cir cumstances the user cannot succeed in setting a parameter to a desired value if the related parameters are not changed beforehand e g to set a pH high setpoint to 10 00 the high alarm must be set to a value greater than pH 10 00 first For code numbers 40 41 42 the outputis related to pH or mV units depending on the model pH process meters or mV process meters Items 41 and 42 are notavailable in pH5025YZ and mV6025YZ CONTROL MODE RELAY MODES Th
13. a significant effect on pH The calibration buffer solutions are effected by temperature changes to a lesser degree than normal solutions For manual temperature calibration please refer to the fol lowing chart TEMP pH VALUES CF 4 01 7 01 10 01 0 32 4 01 7 13 10 32 5 4 4 00 7 10 10 24 10 50 4 00 7 07 10 18 15 59 4 00 7 04 10 12 20 68 4 00 7 03 10 06 2 N 4 01 7 01 10 01 30 86 4 02 7 00 9 96 3 5 4 03 6 99 9 92 40 104 4 04 6 98 9 88 45 13 4 05 6 98 9 85 50 12 4 06 6 98 9 82 55 131 4 07 6 98 9 19 60 140 4 09 6 98 9 77 6 9 4 11 6 99 9 76 70 158 4 12 6 99 9 75 For instance if the buffer temperature is 25 C the display should show pH 4 01 7 01 or 10 01 at pH 4 7 or 10 buffers respectively At 20 C the display should show pH 4 00 7 03 or 10 06 The meter reading at 50 C will then be 4 06 6 98 or 9 82 ELECTRODE CONDITIONING AND MAINTENANCE PREPARATION Reference li a Filling Hole Filling Hole Sensitive Reference SS oe Wire Reference Sensitive Wire Wire Reference T Reference Junction Junction Glass H4 4 8 Glass Bulb G Bulb NS Plastic Body Glass Body pH Electrode pH Electrode Wire Reference Reference Junction Junction Platinum or Al Platinum or Gold tip Gold tip Plastic Body Glass Body ORP Electrode ORP Electrode Wire Reference
14. buffer the meter stores the reading adjust ing the 2 slope point and the calibration process is ended with the offset and the 1 and 2 slope of the meter cali brated If the reading is not close to the se lected buffer WRONG a3 will blink During calibration the secondary LCD displays the selected buffer value By pressing LCD the temperature can be dis played This will allow you to check the buffer temperature during calibration 39 CALIBRATION WITH MANUAL TEMPERATURE COMPENSATION 40 Note Note e Enter the calibration procedure and press LCD to display the temperature on the secondary LCD e Unplug any temperature probe that may be attached to the meter The C sym bol will flash e Note the temperature of the buffer solutions with a ChecktempC or an accurate thermometer with a resolution of 0 1 C e Usel orf to manually adjust the display reading to the value of the reference thermometer e g 20 C e Follow the calibration procedure above To toggle between the pH buffer and the temperature press LCD LF When a one point calibration is carried out only the pH off set is computed and stored while the pH slope is fixed according to the theoretical values With a two point calibration offset and slope are computed to fit the two calibration points With a three point calibra tion the offset and first slope values refers to pH 4 01 and 7 01 buffers while the se
15. data can be viewed pressing CAL DATA while in normal mode but no pH buffer values will be displayed dur ing the data scrolling on LCD mV INPUT CALIBRATION The pH mV controller is factory calibrated for the mV and temperature inputs However the user may also perform a mV calibration Short the Connection for Potential Matching Pin 9 on page 7 and the Connection for the Electrode Reference 8 on page 7 with a jumper wire Attach a HI 931001 pH 502 or HI 8427 mV 602 simu lator to the BNC socket Press and hold first CFM and then CAL CAL to enter the mV Input Cali EI bration mode LF LF Execute the password procedure With pH 502 the meter will ask for the calibration proce dure code number The following table lists the possible values of the input code and calibration points INPUT CODE POINTS CALVALUES INPUT RANGE mV 0 2 0 amp 3500r081900 2000 Temp 1 2 0825010850 9 9 to 120 0 C One of the points must be 0 1900 mV calibration point is available on MV 602 models only When calibrating the mV of mV 602 models enter the calibration mode by pressing CAL and confirming the pass word as for pH calibration of pH 502 No code selection is required Use orl to select code O for mV calibration and press CFM to enter CA A e CAL will blink on the LCD until the meter confirms a steady reading 43 Note e When the reading has stabilized at e f the display stabilizes at a va
16. exits initiates and exits calibration mode increases the blinking digit letter by one when selecting a parameter Advances forward while in last calibration data viewing mode Increases the temperature setting when temperature probe is not inserted decreases the blinking digit letter by one when selecting a parameter Reverts backward while in last calibration data viewing mode Decreases the temperature setting when temperature probe is not inserted moves to the next digit letter circular buffer when select ing a parameter Same as 0 key during last calibration data viewing mode confirms current choice and skips to the next item REAR PANEL Models with 3 contact electromechanical output relay s Models with 2 contact solid state output relay s 8 7 O 8 29 Hy PH 502223 Oa i E E O JO JO 6 G 8 4 e 1 6 pin RS485 terminal not for pH502XY1 and mV602XY1 2 Analog output not for pH502XY2 and mV602XY2 3 Power supply input 4 Alarm terminal 5 Relay 2 second dosing terminal pH5022XY and pH5024XY models only 6 Relay 1 first dosing terminal 7 Connections for Pt 100 temperature sensor 8 Connection for electrode reference 9 Connection for Potential Matching Pin 10 BNC Socket for pH
17. few seconds before exiting selftest procedure tee ht DR a DA 7 l a i If not the message Stored data error Press 0 to reset stored data or I to ignore If D is pressed the EEPROM selftest procedure terminates with no other action Otherwise EEPROM is reset with de fault values from ROM as when a device with a virgin EEPROM is switched on During EEPROM reset a blinking mes sage Set MEM is shown on the LCD At the end of this operation all the pa rameters are reset to their default values Calibration data is also reset For this reason the CAL flag blinks until the pH calibration is performed RELAYS AND LEDS WATCHDOG Note Relays and LEDs selftests are executed as follows First all of the relays and LEDs are switched off then they are switched on one at a time for a few seconds and cyclically User can interrupt the otherwise endless cycle as indicated by the scrolling message by pressing a key Dat Fi L Lo Ll al a UR JR a i en ee Relays and LEDs test has to be carried out with the relay contacts disconnected from external plant devices When a dead loop condition is detected a reset is automati cally invoked The effectiveness of watchdog capability can be tested through one of the special setup items This test consists of executing a dummy dead loop that causes watchdog reset signal to be generated 55 pH VALUES AT VARIOUS TEMPERATURES 56 Temperature has
18. least 1 00 pH or 50 mV The analog output is factory calibrated through software The user may also perform these calibration procedures following the procedure at page 47 It is recommended to perform the output calibration at least once a year 27 RS 485 COMMUNICATION SPECIFICATIONS 28 pH502XY2 pH502XY3 mV602XY2 and mV602XY3 are pro vided with an RS485 port RS485 standard is a digital transmission method that allows long lines connections lts current loop system makes this standard suitable for data transmission in noisy environments Data transmission from the instrument to the PC is possible with the HI 92500 Windows compatible application soft ware offered by Hanna Instruments The user friendly HI 92500 offers a variety of features such as logging selected variables or plotting the recorded data It also has an on line help feature to support you throughout the operation HI 92500 makes it possible for you to use the powerful means of the most diffused spreadsheet programs Excel Lotus 2 3 etc Simply run your favorite spread sheet and open the file downloaded by HI 92500 It is then possible to elabo rate the data with your software e g graphics statistical analysis To install HI 92500 you need a 3 5 drive and few minutes to follow the instructions conveniently printed on the disk s label Contact your Hanna Dealer to request a copy The RS485 standard is implemented in pH502 mV602
19. month 01 to 12 from RTC no 62 Current year 1997 to 9999 from RTC no 63 Current time 00 00 to 23 59 from RTC no 71 Baud rate 1200 2400 4800 9600 9600 RS485 no 90 Display selftest 0 off 0 yes 1 on 91 Keyboard selftest 0 off 0 yes 1 on 92 EEPROM selftest 0 off 0 yes 1 on 93 Relays and LEDsselftest 0 off 0 yes 1 on 94 Watchdog selftest 0 off 0 yes 1 on 99 Unlock password 0000 to 9999 0000 yes The the con process controller automatically checks to ensure that entered data matches other related variables If a wrong figuration is entered WRONG blinks on the LCD to prompt the user The correct configurations are the following EMI If M For EMI EMI EMI IfM IfM IfM IfM IfM 0 then S1 lt HA ST gt LA 2 0 then S2 lt HA S2 gt LA models other than pH5025YZ and mV6025YZ then S1 H1 gt L 2 then S1 H1 lt HA 3 then S1 D1 lt HA 4 then S1 D1 gt L 2 then S2 H2 gt 1A 2 2 then S2 H2 lt HA 2 3 then S2 D2 lt HA 2 4 then S2 D2 gt 1A If M1 1 and M2 2 then S1 H1 gt S2 H2 S2 gt LA HA gt S1 If M 1 2 and M2 then S2 H2 gt S1 H1 S1 gt LA HA gt S2 Note Note Note If M1 3andM2 2 then S1 gt S2 H2 S2 gt LA HA gt S1 D1 If M1 2 andM2 3 then S1 H1 lt S2 S1 gt LA HA gt S2 D2 If M1 4 and M2 then S1 lt S2 H2 S1 D1 gt LA HA gt 2 fMI 1 andM2 4 then S1 H1 gt S2 S2 D2 gt L HA gt S1 fMI 3 and M2 4 then
20. or ORP electrode 11 5V power supply output A Unplug the meter before starting any electrical connections MECHANICAL DIMENSIONS 138 0 mm 144 0 mm 140 0 7 165 0 mm FRONT VIEW SIDE VIEW 7 SPECIFICATIONS pH 502 amp mV 602 Range 0 00 14 00 pH pH 502 series only 2000 mV mV 602 series only 9 9 to 120 0 C Resolution 0 01 pH pH 502 series 1 mV mV 602 series 0 1 C Accuracy 20 C 68 F 0 02 pH pH 502 series 2 mV mV 602 series 0 5 C Typical EMC Deviation 0 2 pH pH 502 series 10 mV mV 602 series 05 C Calibration pH automatic 1 2 or 3 point at pH 4 01 7 01 10 01 ORP automatic 2 point at 0 and 350 or 1900 mV Temperature Compensation pH 502 series only automatic with Pt100 probe or manual 9 9 to 120 C Outputs digital RS485 bi directional optoisolated or analog galvanically isolated 0 1 mA 0 20 mA and 4 20 mA 0 5 Vdc 1 5 Vdc and 0 10 Vdc Setpoint Relay 1 or 2 contact outputs SPDT 5A 250 Vac 5A 30 Vdc resistive load fuse protected 5A 250V fuse or 1 or 2 Solid State Relays SSR 1A 250 Vac resistive and inductive load fuse protected 2A 250V fast fuse Alarm Relay 1 contact output SPDT 5A 250 Vac 5A 30 Vdc resistive load fuse protected 5A 250V fuse Installation Category I Power Supply 230 10 VAC or 115 10 VAC 50 60 Hz Power Consumption 15 VA Over Current Protect
21. the controller the procedure is easier and doesn t need the use of hand plotting the process variable pH or mV 22 1 Starting from a solution with a pH or mV value different from the dosed liquid at least a 3 pH or 150mV difference turn on the dosing device at its maximum capacity without the controller in the loop open loop process Note the starting time 2 After some delay the pH or mV starts to vary After more delay the pH or mV will reach a maximum rate of change slope Note the time that this maximum slope occurs and the pH or mV value at which it occurs Note the maximum slope in pH or mV per minute Turn the system power off 3 On the chart draw a tangent to the maximum slope point until intersection with the horizontal line corresponding to the initial pH or mV value Read the system time delay Tx on the time axis 4 The deviation Ti and Td can be calculated from the following e Deviation Tx max slope pH or mV e Ti Tx 0 4 minutes e Td Tx 0 4 minutes 5 Set the above parameters and restart the system with the controller in the loop If the response has too much over shoot or is oscillating then the system can be fine tuned slightly increasing or decreasing the PID parameters one ata time Example gt the chart recording in the figure p aside was obtained continuously dosing an alkaline solution to a weak acid solution in a tank The i initial settings will be As ain
22. the output calibration at least once a year Calibration should only be performed after 10 minutes from power up e With a multimeter or an HI 931002 connect the common port to the B TS ground output and the second port to 0 the current or voltage output depend CC a volage output ing on which parameter is being E Ground Output i C Current Output calibrated Press and hold in sequence CFM first then 0 and then CAL to enter the Analog Output Calibration mode Execute the password procedure The primary display will show the current selected param eter blinking Use the 0 to select the code 0 5 see next chart for the desired parameter displayed on the second ary display e g 4 20 mA Note Press CFM to confirm the parameter that stops blinking on the primary display The secondary display shows the multi meter or HI931002 input value as the interval lower limit a Use 0 or 0 to make the HI931002 or multimeter output correspond with the value shown A A on the secondary display e g 4 Wait until the calibrator reading is stable approx 30 sec Press CFM to enter The meter will switch to the second calibration point Repeat the above procedure Atter the desired readings are obtained press CFM and the meter will skip back to normal operating mode When adjusting values using the 0 or D it is important to allow for sufficient response time up to 30 seconds The table bel
23. FTEST KEYBOARD SELFTEST The error detection for dead loops is performed by watchdog see below You can use special setup codes perform selftest procedures for LCD keyboard EEPROM relays and LEDs watchdog The operation of these functions is outlined in the setup sec tion The selftest procedures are described in detail in the following subsections The display selftest procedure consists of lighting up all of the display segments together The Display test is announced by a scrolling Display test message The segments are lit for a few seconds and then switched off before exiting the selftest procedure The keyboard selftest procedure begins with the message But ton test press LCD CAL and SETUP together to escape The LCD will then show only a colon 1 or As soon as one or more keys are pressed the appropriate segments out of 8 8 8 8 corresponding to the pressed keys will light up on the screen For example if SETUP and 0 are pressed together the LCD will look like this 53 Note EEPROM SELFTEST 54 The colon is a useful indicator for the correct position of squares A maximum of two keys may be pressed simultaneously to be properly recognized To exit the keyboard test procedure press LCD CAL and SETUP simultaneously The EEPROM selftest procedure involves verifying the stored EEPROM checksum If the checksum is correct the Stored data good message will be shown for a
24. HANNA instruments pH 502 amp mV 602 Series Panel mounted Microprocessor based pH and ORP Controllers Instruction Manual Dear Customer Thank you for choosing a Hanna Product Please read this instruction manual carefully before using the instrument It will provide you with the necessary information for the correct use of the instrument as well as a precise idea of its versatility If you need additional technical information do not hesitate to e mail us at tech hannainst com These instruments are in compliance with the C directives MODEL IDENTIFICATION The models pH502 XYZ are pH controllers while the mod els mV602 XYZ a are ORP controllers The meaning of the last letters is according to the following codifications X 1 single setpoint X 2 dua X 3 single setpoint with SSR relay X 1 single setpoint X 4 dual setpoint with SSR relay X 2 dual setpoint X 5 control through analog output X 5 control through analog output Y 1 ON OFF control Y 1 ON OFF control only for X 1 2 only for X 1 Y 2 ON OFF and PID controls Y 2 ON OFF and PID controls Z 1 analog output Z 1 analog output only for X 3 4 only for X 3 Z 2 RS485 output Z 2 RS485 output only for X 3 4 only for X 3 Z 3 analog and RS485 outputs Z 3 analog and RS485 outputs TABLE OF CONTENTS a 1 115 Vac power supply a 2 230 Vac power supply a 2 230 Vac po
25. a pool of water or solution e Slow Response Excessive Drift soak the tip in HI 7061 solution for 30 minutes rinse thoroughly in distilled water and then follow the Cleaning Procedure above e For ORP electrodes polish the metal tip with a lightly abra sive paper paying attention not to scratch the surtace and wash thoroughly with water With industrial applications it is always recommended to keep at least one spare electrode handy When anomalies are not resolved with a simple maintenance change the electrode and recalibrate the controller to see if the problem is alleviated TAKING REDOX MEASUREMENTS Redox measurements allow the quantification of the oxidizing or reducing power of a solution and are commonly expressed in mV Oxidation may be defined as the process during which a molecule or an ion loses electrons and reduction as the process by which electrons are gained Oxidation is always coupled together with reduction so that as one element gets oxidized the other is automatically re duced therefore the term oxidation reduction is frequently used Redox potentials are measured by an electrode capable of ab sorbing or releasing electrons without causing a chemical reaction with the elements with which it comes into contact The electrodes most usually available for this purpose have gold or platinum surfaces gold possesses a higher resis tance than platinum in conditions of strong oxidation such as cyanide w
26. age or current and the C Curent Ouput range of the output analog signal is selectable through the jumpers on the power board Configurations of the switch are as follows 0 10 Vdc ON OFF oe _ 0 20 mA 4 20mA nn ON RA 0 1 mA _ _ OFF Choice between different ranges with the same configuration for example 0 20 mA and 4 20 mA is achieved via soft ware by entering the setup mode and selecting code 40 see Setup Mode section for exact procedure Factory default is switches 1 and 3 closed ON and switches 2 and 4 open OFF i e 0 20 mA 4 20 mA and 0 10 Vdc In any case contact the nearest Hanna Customer Service Center for changing of the default configuration By default the minimum and maximum values of analog output correspond to the minimum and maximum of the range of the meter For example for the pH 502 series with a selected ana log output of 4 20 mA the default values are 0 00 and 14 00 pH corresponding to 4 and 20 mA respectively These values can be changed by the user to have the analog output matching a different pH range for example 4 mA 3 00 pH and 20 mA 5 00 pH Note Note To change the default values the setup mode must be en tered Setup codes for changing the analog output minimum and maximum are 41 or 42 respectively For the exact procedure refer to the setup mode section in the manual The difference between maximum and minimum values for the analog output must be at
27. al temperature The actual pH value varies with temperature thus the cali bration value displayed on the secondary LCD will vary around pH 4 01 7 01 and 10 01 with temperature changes for ex ample at 25 C the display shows 4 01 7 01 10 01 at 20 C it shows 4 00 7 03 10 06 see page 57 for other val ues e pH 7 01 is the default value for the 1 calibration buffer If a dif ferent value is needed select it LA A on the secondary display by pressing O orl If the wrong password is entered the system reverts back and restarts displaying the pH value Note Note e Remove the protective cap from the pH electrode and immerse it into the selected buffer solution e g pH 7 01 with the Potential Matching Pin and temperature probe then stir gently The electrode should be submerged ap proximately 4 cm 1 1 in the solution The temperature probe should be located 5k as close as possible to the pH electrode 33 When it is not possible to immerse the Potential Matching Pin together with the pH electrode in the solution disable the differential input by connecting the Connection for Potential Matching Pin 9 page 7 with the Connection for Electrode Reference 8 on page 7 with a jumper wire e Only when the reading is stable the probe indicator 1 will stop flashing atter about 30 seconds and the CFM indicator will start blinking e Press CFM to confirm the calibration if the r
28. ature compensation of pH measurement In the case of shielded wire connect the shield to pin 4 In the case of a 2 wire sensor con nect the Pt 100 to pins 1 and 3 p 4o0 109 and short pins 2 and 3 with a jumper wire Shield j4 If the Pt 100 has more than 2 M B Tit wires connect the two wires of one peauo lies ai 100 end to pins 2 and 3 pin 2 is an 6 s auxiliary input to compensate for Shisa a the cable resistance and one wire trom the other end to pin 1 Leave the fourth wire unconnected if present e Power Supply Output these terminals Power 5V provide 5 Vdc and 5 Vdc signals to Supply IG 0 supply power to amplified electrodes Output e 5y All cables connected to rear panel should end with cable lugs SETUP MODE pH 502 and mV 602 offer a multitude of possibilities from ON OFF or PID dosage to analog recorder output and trom alarm to selftest features The Setup Mode allows the user to set all needed character istics of the meter The setup mode is entered by pressing SETUP and entering the password when the device is in idle or control mode Generally speaking if the password is not inserted the user can only view the setup parameters except for password without moditying them and the device remains in control mode An exception is certain setup items or flags which can activate special tasks when set and confir
29. cond slope refers to pH 7 01 and 10 01 buffers If the process meter has never been cali brated or an EEPROM reset has occurred the meter continues to perform measure ment However the user is intormed of a pH calibration requirement by a blinking CAL see Startup section The device must be calibrated within the temperature range of 0 95 C Outside this range the buffer pH values are not reliable PH BUFFER SELECTION Note Note Note Aone point pH calibration at a value different from standard buffer is possible by directly entering the desired calibration value e Poura small quantity of the calibra tion solution in a beaker and then press CAL to enter the calibration mode ae e After the correct password is entered the control action stops and the pri E at gp mary LCD will display the pH value pad ema ce using the current offset and slope ad c with the CAL and Qu indicators pord lit and the probe indicator 1 blink ing e Press SETUP and the pH value on the secondary LCD will start blink F e Bythe0 0 andO keysselectthe pH calibration value ofthe buffer M e mmerse the electrodes in the buffer solution e When the reading is stable press CFM to confirm the cali bration During calibration with pH buffer solutions different from stan dard the stability check function is not active No CAL or a indicators will blink hence wait for the reading to s
30. e control mode is the normal operational mode for these meters During control mode pH 502 and mV 602 fulfill the following main tasks convert information from pH ORP and temperature inputs to digital values control relays and generate the analog outputs as deter mined by the setup configuration display alarm condition e RS485 management if the feature is included In addition pH 502 and mV 602 can log working data through RS485 connection This data includes pH mV and C measured values e last calibration data e setup configuration also from PC The status of the meter is shown by the LED s on the right STATUS LEDs Control Alarm Alam LED green Relay LED yellow Red LED OFF ON OFF ON ON OFF ON ON or OFF OFF ON ON OFF ON or OFF Blinking Meter exits control mode by pressing SETUP or CAL and con firming the password Note that this command generates a temporary exit To deactivate the con trol mode definitively set CONTROL ES ENABLE to O item 02 Once enabled the relays and 2 can be used in four ditfer ent modes 1 ON OFF high setpoint acid dosage not for pH5025YZ and mV6025YZ 2 ON OFF low setpoint base dosage not for pH5025YZ and mV6025YZ 3 PID low setpoint base dosage if available 4 PID high setpoint acid dosage if available An upper boundary is imposed for acid base dosage time when relays are energized continuously i e when relay works
31. e separated by blanks If an item is not available e g Buf 3 if only a two points calibration was performed it is replaced by the N charac ter The r485 message can appear on the LCD while the con troller is receiving or answering commands SETTING THE BAUD RATE 34 The transmission speed baud rate of the meter and external device must be th same The meter is factory set to 9600 bps To change this value use setup item 71 CALIBRATION The controller is factory calibrated for mV and temperature inputs as well as for the analog outputs The user should periodically calibrate the instrument For great est accuracy it is recommended that the instrument is calibrated frequently lt is possible to standardize the electrode with only one buffer preferably close to the expected sample value one point cali bration but itis always good practice to calibrate in at least 2 points pH CALIBRATION for pH 502 Series only Initial Preparation The pH controller can be calibrated through a one point two point or three point calibration You do not need to en ter the method chosen simply exit the calibration mode by pressing CAL en when the desired number of points has LF been calibrated The calibration points for pH 502 are pH 4 01 pH 7 01 and pH 10 01 at 25 C The sequence proposed by the controller is pH 7 01 pH 4 01 pH A 10 01 However the user can change p this sequence by means o
32. eading is close to the selected buffer 1 5 pH the meter stores the reading and the secondary LCD will display the expected second buffer value Offset and slope calculation is made at the end by pressing CAL to exit Ifthe reading is not close to the selected buffer WRONG will blink e If CALis pressed the calibration pro cess ends by memorizing a new offset ES value The new offset value is stored iA and a default value of 57 5 mV per pH unit at 25 C is assigned as the new slope value For best accuracy however it is recommended that a two point calibration is performed 37 Two point Calibration Note Note Note 38 e Proceed as described above for one point cali bration using pH 7 01 as the first point but do not quit calibration by pressing CAL at the end The meter will automatically skip the buffer that was used for the first calibration to prevent errors e After the first calibration point is con firmed immerse the pH electrode with the Potential Matching Pin into the sec ond buffer e g pH 4 01 and stir gently If you are not going to perform a three point calibration it is recommendable to use pH 4 01 buffer if you are going to mea sure acid samples or use pH 10 01 buffer for alkaline samples The electrode should be submerged ap proximately 4 cm 1 in the solution The temperature probe should be located as close as possible to the pH el
33. ectrode Sg e Select the 2 buffer value on the secondary display by i A ing orll e g pH 4 01 e Only when the reading is 1 the probe indicator 1 will stop flashing after about 30 seconds and the CFM indicator will blink e Press CFM to confirm the calibration if the reading is close to the selected buffer the meter stores the reading adjust ing the slope point and the secondary LCD will display the expected third buffer value caL If the reading is not close to the se lected buffer WRONG 4 will blink e Press CAL and the calibration pro cess is ended with the offset and the 1 slope of the meter calibrated Three point Calibration Note Note Note e Proceed as described above but do not quit calibration by pressing CAL The meter will automatically skip the two butters that were used to prevent errors e After the second calibration point is contirmed immerse the pH elec trode and the Potential Matching Pin into the third buffer solution e g 10 01 and stir gently The electrode should be submerged approximately 4 cm 11 in the so lution The temperature probe should be located as close as possible to the pH electrode e Only when the reading is stable the probe indicator 1 will stop flash ing after about 30 seconds and the CFM indicator will start blinking e Press CFM to confirm the calibration if the reading is close to the selected
34. ed the display will only show the previously memo rized value without blinking read only mode In this case the value cannot be set Press LCD and start again e Enter the desired value using the arrow keys and then press CFM After confirmation the selected param eter is displayed The user can scroll through the parameters by pressing CFM In order to directly set another param eter press SETUP again and enter the code or scroll to it by pressing CFM The following table lists the setup codes along with the descrip tion of the specific setup items their valid values and whether password is required to view that item PW column Code Valid Values Default PW 00 Factory ID 0 to 9999 0000 no 01 Process ID Oto 9999 models w o RS485 0000 no 0 to 99 models with RS485 00 no 02 Control enable disable 0 C M disabled 0 no 1 CM enabled 11 Relay 1 mode 0 disabled 0 no M1 1 ON OFF high setpoint 2 ON OFF low setpoint 3 PID high setpoint 4 PID low setpoint for pH 5025YZ and mV 6025YZ only 0 d 1 PID high setpoint 2 PID low setpoint 12 Relay 1 setpoint 0 00 to 14 00 pH 8 00 pH no S1 2000 to 2000 mV 500 mV 13 Relay 1 hysteresis 0 00 to 14 00 pH 1 pH no H1 0 to 4000 mV 50 mV 14 Relay 1 deviation 0 50 to 14 00 pH 1 pH no 01 25 to 4000 mV 50 mV 15 Relay 1 reset time 0 1 to 999 9 minutes 999 9mins no 16 Relay 1 rate time 0 0 to 999 9 minutes 0
35. en the pH value is below the setpoint and is de energized when the pH value is above the sum of setpoint and the hysteresis The low setpoint relay may be used to control an alkaline dosing pump PI D CONTROL MODE ON OFF Setpoint Setpoint 14 Hysteresis PID control is designed to eliminate the cycling associated with ON OFF control in a rapid and steady way by means of the combination of the proportional integral and derivative control methods With the proportional function the duration of the activated control is proportional to the error value Duty Cycle Control Mode as the measurement approaches setpoint the ON period diminishes The following graph describes the pH process controller be havior Similar graph may apply to the mV controller t ir j ht A I During proportional control the process controller calculates the relay activation time at certain moments t tp 7 tp 2T etc The ON interval the shaded areas is then dependent to the error amplitude With the integral function reset the controller will reach a more stable output around the setpoint providing a more accurate control than with the ON OFF or proportional ac tion only The derivative function rate action compensates for rapid changes in the system reducing undershoot and overshoot of the pH value During PID control the ON interval is dependent not only to the error amplitude but even to the pre
36. etpoints Ti Kp Ki reset time measured in minutes Td Kd Kp rate time measured in minutes Til and Td will be the reset time and rate time for setpoint while Ti2 and Td2 will be the reset time and the rate time for setpoint2 TUNING A PID CONTROLLER The proportional integrative derivative terms must be tuned i e adjusted to a particular process Since usually the pro cess variables are not completely known a trial and error tuning procedure must be applied to get the best possible control for the particular process The target is to achieve a fast response time and a small overshoot Many tuning procedures are available and can be applied to pH502 and mV602 Asimple and profitable procedure is reported in this manual and can be used in almost all appli cations The user can vary five different parameters i e the setpoint S1 or S2 the deviation D1 or D2 the reset time the rate time and the proportional control mode period T from 1 to 30 minutes for models with electromechanical relays and from 5 seconds to 30 minutes for models with SSR Note User can disable the derivative and or integrative action for P or Pl controllers by setting Td O and or Ti MAX Ti respectively through the setup procedure SIMPLE TUNING PROCEDURE The following procedure uses a graphical technique of ana lyzing a process response curve to a step input Note Connecting an external device chart recorder or PC to
37. f the 0 and O keys The electrode must be kept hydrated at all times and defi nitely prior to calibration The temperature probe should also be connected to the process meter The meters are equipped with a stability indicator The user is also guided with indica tions on the display during the calibration procedure Pour small quantities of pH 7 01 HI 7007 and pH 4 01 HI 7004 and or pH 10 01 HI 7010 solutions into indi vidual beakers If possible use plastic beakers to minimize any EMC interference 35 For accurate calibration use two beakers for each buffer solution the first one for rinsing the electrode the second one for calibration By doing this contamination between the buffers is minimized RINSE CALIBRATION as as HI 7007 HI 7007 FR To obtain accurate readings use pH 7 01 and pH 4 01 if you measure acidic samples or pH 7 01 and pH 10 01 for alkaline measurements or perform a 3 point calibration for the entire range One Point Calibration Offset Note Note 36 e To perform the pH calibration enter the calibration mode by pressing CAL and entering the password At e After the correct password is entered the control actions stop and the pri mary LCD will display the pH value using the current offset and slope with the CAL and tw indicators lit and the probe indicator 1 blink ing The value displayed on the secondary LCD is the buffer value at the actu
38. ging and assure a quick response time the glass bulb and the junction should be kept moist and not allowed to dry out This can be achieved by installing the electrode in such a way that it is constantly in a well filled with the sample stream or tank When not in use replace the solution in the protective cap with a few drops of HI 70300 storage solution or in its absence HI 7007 pH 7 01 buffer solution Follow the Preparation Procedure above before taking mea surements NEVER STORE THE ELECTRODE IN DISTILLED OR DEION IZED WATER PERIODIC MAINTENANCE 58 Inspect the electrode and the cable The cable used for the connection to the controller must be intact and there must be no points of broken insulation on the cable or cracks on the electrode stem or bulb Connectors must be perfectly clean and dry If any scratches or cracks are present replace the electrode Rinse off any salt deposits with water For refillable electrodes CLEANING PROCEDURE IMPORTANT TROUBLESHOOTING Refill the electrode with fresh electrolyte HI 7071 for single junction or HI 7082 for double junction electrodes Allow the electrode to stand upright for 1 hour Follow the Stor age Procedure above Soak in Hanna HI 7061 general cleaning solution for approximately 30 minutes General Removal of films dirt or deposits on the membrane junction Protein Soak in Hanna HI 7073 protein cleaning so lution for 15 minutes Soak in Hanna
39. hile platinum is preferred for the measurements of oxidizing solutions containing halides and for general use When a platinum electrode is immersed in an oxidizing solu tion a monomolecular layer of oxygen is developed on its surtace This layer does not prevent the electrode from func tioning but it increases the response time The opposite effect is obtained when the platinum surface absorbs hydrogen in the presence of reducing mediums This phenomenon is rough on the electrode To make correct redox measurements the following condi tions must prevail The surface of the electrode must be cleaned and smooth The surface of the electrode must undergo a pretreatment in order to respond quickly Because the Pt PtO system depends on the pH the pretreat ment of the electrode may be determined by the pH and the redox potential values of the solution to be measured As a general rule if the ORP mV reading corresponding to the pH value of the solution is higher than the values in the table below an oxidizing pretreatment is necessary other wise a reducing pretreatment is necessary 62 Note pH mV H mV H y H mm H mv 0 90 1 920 2 860 3 800 4 740 5 68 6 640 7 58 8 520 9 460 10 400 11 340 12 280 13 220 14 160 Reducing pretreatment immerse the electrode for a few min utes in HI 7091 Oxidizing pretreatment immerse the electrode for a few min utes in HI 7092 If the pretreatment is not performed the electrode wil
40. icated yet easy to use system resolves these predicaments on two fronts hardware and software To elimi nate problems of blackout and line failure the alarm function operates in a Normally Closed state and hence alarm is triggered if the wires are tripped or when the power is down 23 Note This is an important feature since with most meters the alarm terminals close only when an abnormal situation arises how ever due to line interruption no alarm is sounded causing extensive damage On the other hand software is em ployed to set off the alarm in abnormal circumstances for example if the dos ing terminals are closed for too long a period In both cases the red LED s will also provide a visual warning signal The Fail Sate mode is accomplished by connecting the exter nal alarm circuit between the FS C Normally Open and the COM terminals This way an alarm will warn the user when pH goes over the alarm thresholds the power breaks down and in case of a broken wire between the process meter and the external alarm circuit FS 0 FS eC te In order to have the Fail Safe feature activated an external power supply has to be connected to the alarm device CONTROL THROUGH ANALOG OUTPUT Note 24 Models pH5025YZ and mV6025YZ have a proportional out put signal selectable among 0 1 mA 0 20 mA 4 20 mA 0 5 Vdc 1 5 Vdc and 0 10 Vdc at the analog output termi nals With this ou
41. ion 400 mA 250V fast fuse Environment 0 to 50 C 32 to 122 F RH max 95 Enclosure single case DIN Dimensions panel cutout 140 x 140 mm instrument 144 x 144 x 170 mm Weight approximately 1 6 kg 3 5 Tb INSTALLATION STOP pH 502 and mV 602 al _ si offer a multitude ot possibilities from single and dual setpoints to EMERGENCY oot V2 Le POWER ALARM LR ON OFF or PID dos av age isolated outputs A v v with user selectable zoom bi directional RS485 recorder out Fuse puts in mAmps and Volts In addition pH 502 and mV 602 are both equipped with the ex clusive differential input 2 o M MIXER FUSE FUSE BLx PUMP 2 In a system with poor grounding it is possible to have a ground cur rent flowing through BLx PUMP 1 the reference junction This can cause a rapid POTENTIAL MATCHING PIN OBE 0 degradation of the elec trode The Hanna differential input re duces the likelihood of O ground loops Pt 100 See the diagram for a recommended installa tion POTENTIAL MATCHING REFERENCE ELECTRODE c1 112 OST OD pH 500 ER CONTACT 1 N i A i s o j Se bs com
42. l take significantly longer to respond As with pH electrodes gel filled redox electrodes are more suitable for industrial applications due to lesser mainte nance requirements However if working with refillable electrodes the electrolyte level should not fall more than 2 cm 1 below the fill hole and topped up if necessary Use HI 7071 refill solution for single junction and HI 7082 for double junction electrodes In the event that measurements are performed with solutions containing sulfides or proteins the cleaning of the diaphragm of the reference electrode must be performed more often to maintain the proper functioning of the ORP electrode There fore immerse it into HI 7020 and measure the response the obtained value should be within 200 and 275 mV After this functional test it is suggested to wash the electrode thoroughly with water and proceed to the oxidizing or reduc ing pretreatment before taking measurements When not in use the electrode tip should be kept moist and far from any type of mechanical stress which might cause damage This can be achieved by installing the electrode in such a way that it is constantly in a well filled with the sample stream or tank When not in use store the electrode with a few drops of HI 70300 storage solution in the protective cap With industrial applications it is always recommended to keep at least one spare electrode handy When anomalies are not resolved with a simple
43. lue a point near the first calibration point CAL will stop blinking and an intermittent CFM icon will prompt the user to confirm the first calibration significantly different from the first setpoint an intermittent WRONG icon will prompt the user to check and adjust the simulator and start again e After pressing CFM the unit will switch to the second cali bration point at 350 mV e With mV 602 it is possible to select 1900 mV by pressing O orf After that proceed as described above ali al A measure is considered stable when it varies little within a sequence of acquisitions The number of acquisitions is fixed so that the waiting time for blinking CFM is about 20 sec onds Calibration procedure may be interrupted by pressing CAL If the calibration procedure is in on terrupted this way or if the controller is switched LF off before the last step no calibration data is stored to EEPROM TEMPERATURE CALIBRATION 44 The pH mV controller is factory calibrated for the mV and temperature inputs However the user may also perform a temperature calibration e Prepare a beaker containing ice and water at 0 C 32 F and an other one with hot water at 25 C 77 F or 50 C 1 22 F Use a Checktemp or a calibrated thermometer with a reso lution of 0 1 as a reference thermometer Immerse the temperature probe in the beaker with ice and water as near to the Checktemp as possible P
44. maintenance change the elec trode to see if the problem is alleviated ACCESSORIES pH CALIBRATION SOLUTIONS HI 7004M HI 7004L HI 7004 L HI 7007M HI 7007L HI 7007 L HI 7010M HI 7010L HI 7010 L ORP SOLUTIONS HI 7020M HI 7020L HI 7091M HI 7091L HI 7092M HI 7092L pH 4 01 buffer solution 230 mL bottle pH 4 01 buffer solution 500 mL bottle pH 4 01 buffer solution 1 L bottle pH 7 01 buffer solution 230 mL bottle pH 7 01 buffer solution 500 ml bottle pH 7 01 buffer solution 1 L bottle pH 10 01 buffer solution 230 ml bottle pH 10 01 buffer solution 500 mL bottle pH 10 01 buffer solution 1 L bottle ORP test solution at 200 275 mV 230 mL bottle ORP test solution at 200 275 500 mL bottle Reducing pretreatment solution 230 mL bottle Reducing pretreatment solution 500 mL bottle Oxidizing pretreatment solution 230 mL bottle Oxidizing pretreatment solution 500 mL bottle ELECTRODE MAINTENANCE SOLUTIONS HI 70300M HI 70300L HI 7061M HI 7061L HI 7073M HI 7073L HI 7074M HI 7074L HI 7077M HI 7077L HI 7071 HI 7072 HI 7082 Storage solution 230 mL bottle Storage solution 500 mL bottle General cleaning solution 230 mL bottle General cleaning solution 500 mL bottle Protein cleaning solution 230 mL bottle Protein cleaning solution 500 mL bottle Inorganic cleaning solution 230 mL bottle Inorganic cleaning solution 500 mL bottle Oil amp Fat cleaning solution 230 mL bottle Oil am
45. med Each setup parameter or setup item is assigned a two digit setup code which is entered and displayed on the secondary LCD The setup codes can be selected after password and CFM are pressed When CFM is pressed the current setup item is saved on EEPROM and the following item is displayed Whenever LCD is pressed the de vice reverts back to control mode EI The same is true when CFM is LF LF pressed on the last setup item The possible transitions in setup mode are the following ENTERING THE PASSWORD e Press SETUP to enter the setup mode The LCD will display 0000 on the upper part and PAS on the lower The first digit of the upper part of the LCD will blink rt ett tt e Enter the first value of the pass word by the 0 orf keys Note Note e Then confirm the displayed digit with O and move to the next one e When the whole password has been inserted press CFM to confirm it The default password is set at 0000 The LCD will display SET on the upper part and c 00 on the lower allowing the user to edit setup pa rameters see table below Enter the code of the parameter you want to set using the arrow keys as per the password procedure above e g 41 Contirm the code by pressing CFM and the default or the previously memorized value will be displayed with the first digit blinking When the password is not inserted or a wrong password is confirm
46. mpensation of the pH reading for pH 502 series only Manual temperature setting when the temperature probe is not inserted or temperature exceeds the upper range Last calibration data internally recorded non volatile EE PROM memony calibration date and time pH offset pH slopes number of calibration points and correspondent pH values for pH 502 series only or calibration date and time and the mV calibration points used for mV 602 se ries only Input pH electrode with BNC connector 5 Vdc output for amplitied electrodes Output isolated 0 1 mA 10 KO maximum load optional isolated 0 20 mA 750 maximum load optional isolated 4 20 mA 750 maximum load optional isolated 0 5 Vdc 1 KO minimum load optional isolated 1 5 Vdc 1 KO minimum load optional isolated 0 10 Vdc 1 K minimum load optional Real time clock FUNCTIONAL DESCRIPTION FRONT PANEL 1 Liquid Crystal Display 2 LCD key SETUP key CAL DATA key CAL key O key Ox 01 Go 7 D key 8 O key 9 CFM key 10 LEDs cece stl BUF E A DOODOO exits from setup and calibration modes and reverts back to normal mode in idle or control phases with the measure ment on the display In pH 502 series during pH calibration alternately displays pH buffer value or current temperature enters setup mode last calibration data viewing enters and
47. n amplifier and external thread 3 4x16 UNF a DIA 12 mm DIA 20 5 mm i L y F 110 mm i a 38 5mm ELECTRODES FOR HIGH PRESSURE APPLICATIONS pH ELECTRODES 2 thread double PVDF junction polymer filled max operating pressure of 6 bar 87 psi atin ik mm art Code atching Pin mplitier onnector Cable HI 1002 3 NO NO BNC 3m 10 HI 1002 5 NO NO BNC 5m 16 5 HI 1003 3 YES NO BNC 3m 10 HI 1003 5 YES NO BNC 5m 16 5 HI 1004 5 YES YES spade lugs 5m 16 5 In addition to the electrode connector there is also a spade lug connection for the matching pin 66 ORP ELECTRODES 1 2 thread double PVDF junction polymer filled max operating pressure of 6 bar 87 psi mnt DIA 12 mm HW m lE 40 mm 21 mm 45 mm 18 mm 124 mm PLATINUM ELECTRODES art Code atching Pin mplitier onnector Cable HI 2002 3 NO NO BNC 3m 10 HI 2002 5 NO NO BNC 5m 16 5 HI 2003 3 YES NO BNC 3 m 10 HI 2003 5 YES NO BNC 5m 16 5 HI 2004 5 YES YES spade lugs 5m 16 5 GOLD ELECTRODES Part Code Matching Pin Amplifier Connector Cable HI 2012 3 NO NO BNC 3m 10 HI 2012 5 NO NO BNC 5m 16 5 HI 2013 3 YES NO BNC 3m 10 HI 2013 5 YES NO BNC 5m 16 5 HI 2005 5 YES YES spade lugs 5m 16 5 In addition to the electrode connector there is also a spade lug connection for the matching pin 67 OTHER ACCESSORIES WARRANTY
48. o calibration data is shown when CAL DATA is pressed The no CAL message will blink for a few sec onds then the meter skips back to normal mode DATA e Pressing D will cycle through the fol lowing steps in reverse order i e last A buffer Note In any moment by pressing LCD or CAL DATA the meter will return to the regular operating display CE JE e Press orl to view the time of last calibration The sec ondary display will show HOU to indicate hours AA e e Press 0 orll again to view the offset in mV at the time of last calibration The secondary display will show OFF to indicate offset e Press orl again to view the first slope in mV at the time of last calibration The secondary display will show SL1 to indicate first slope AA e PressO orl again to view the second slope in mV at the time of last calibration The secondary display will show SL2 to indicate second slope AA e Pressll orll again to view the first memorized buffer at the time of last calibration The secondary display will show BUF 1 to indicate first buffer 49 50 e PressO orll again to view the second memorized buffer at the time of last calibration The secondary display will show BUF2 to indicate second buffer e Pressi orll again to view the third memorized buffer at the time of last calibration The secondary display will show BUF3 to indicate third buffer aA e Pressll orll again
49. ow lists the values of output codes along with the calibration values which are the analog output mini mum and maximum as indicated on the display The secondary display indicates the current calibration value while primary display indicates the current calibration type OUTPUT CALIBRATION CALIBRATION CALIBRATION TYPE CODE POINT 1 POINT 2 0 1 mA 0 0 mA mA 0 20 mA 0 mA 20 mA 4 20 mA 2 4mA 20 mA 0 5 Vdc 3 0 Vdc 5 Vdc 1 5 Vdc 4 1 Vdc 5 Vdc 0 10 Vdc 5 0 Vdc 10 Vdc 47 LAST CALIBRATION DATA The meter stores the following information about last calibration in the EEPROM e Date e Time e Offset in mV for pH 502 only e Up to two slopes for pH 502 only e Up to three buffers While displaying this data the pH controller remains in con trol mode The procedure below indicates the flow for a three point cali bration The sequence will vary if fewer calibration points are used e g for a one point calibration the following data will be displayed date time offset first slope buffer 1 value For the mV 602 last calibration data includes date and time of calibration and the values of the 2 calibration points Dis playing of these items follows the above sequence e To begin the cycle press CAL DATA The last calibration date will appear on the main LCD display as DD MM for mat while the secondary display will show the year If the meter has never calibrated or an EEPROM reset has occurred n
50. p Fat cleaning solution 500 mL bottle 3 5M KCI AgCl electrolyte solution 4x50 mL bottle for single junction electrodes 1M KNO electrolyte solution 4x50 ml bottle 3 5M KCI electrolyte solution 4x50 mL bottle for double junc tion electrodes 63 RECOMMENDED pH ELECTRODES all electrodes are gel filled and with ce ramic junction unless otherwise indicated HI 1090T Screw connector external PG13 5 thread double junction glass body polymer filled PG13 5 THREAD DIA 12 mm DIA 9 mm 4 30 mm 110mm HI 1210T Screw connector external PG13 5 thread double junction HI 1211T plastic body cloth junction HI 12 10T PVDF junction poly mer filled HI 12117 PG13 5 THREAD DIA 12 mm x 30 mm 110 mm HI2910B 5 BNC connector 5 m 16 5 cable double junction plastic HI2911B 5 body with built in amplifier and external thread cloth junction HI 2910B 5 PVDF junction polymer tilled HI 291 1B 5 3 4x16 UNF X DIA 12 mm DIA 20 5 mm iN y tn 38 5mm HI 1090B 5 BNC connector 5 m 16 5 cable double junction glass body polymer tilled DIA12mm DIA9mm l 75 mm l gt 35 mm HI 1210B 5 BNC connector 5 m 16 5 cable double junction plastic body PVDF junction polymer tilled 3 4x16 UNF DIA 12 mm DIA 20 5 mm s 110 mm _ _ t 38 5 mm 64 PLATINUM ORP ELECTRODES HI 3090T Screw connector external
51. ress and hold first CFM and then CAL to enter the temperature cali pJ bration mode Execute the password procedure LF With pH 502 the meter will ask for the calibration proce dure code number Use 0 or D to select code 1 for the temperature calibration and press CFM to enter CAL will blink on the LCD until the meter confirms a steady reading When the reading has stabilized at a point near the first calibration point CAL will stop blinking and an intermittent CFM will prompt the user to confirm the first calibration If the reading stabilizes at a reading significantly variant from the first setpoint an intermittent WRONG will prompt the user to check the beaker or baths After pressing CFM the unit will switch to the second cali bration point Select 25 or 50 C by pressing O orf 45 Immerse the temperature probe in the second beaker as near to the Checktemp as possible and repeat the above procedure 122 F Calibration procedure may be interrupted by pressing CAL again at any time If the calibration procedure is stopped this way or if the controller is switched off before the last step no calibration data is stored in non volatile memory EEPROM ANALOG OUTPUT CALIBRATION 46 IMPORTANT In the meters where the analog output is available this fea ture is factory calibrated through software The user may also perform these calibration procedures It is recommended to perform
52. rmed Unlike pH and mV calibration user has no information on calibration need for other magnitudes other than the aware ness that EEPROM was reset After an EEPROM reset all calibrations input and output have to be performed in order to obtain correct measure ments FAULT CONDITIONS AND SELFTEST PROCEDURES Note 52 The fault conditions below may be detected by the software e EEPROM data error e 2C internal bus failure e code dead loop EEPROM data error can be detected through EEPROM test procedure at startup or when explicitly requested using setup menu When an EEPROM error is detected user is given the option to perform a reset of EEPROM Thus the reset can be per formed whenever needed It may be useful to provide a means to reset EEPROM directly without a previous EEPROM error detection This is done by pressing CFM first and then SETUP O and CAL DATA simultaneously When an EEPROM reset has been per formed calibration data are reset to default An intermittent CAL will blink on the display to advise the user of this status A I2C failure is detected when the 2C transmission is not acknowledged or a bus fault occurs for more than a certain number of attempts this can be due for example to dam age sustained by one of the ICs connected to 12C bus If so the controller stops any tasks and displays a perpetual sliding message Serial bus error i e this is a fatal error DISPLAY SEL
53. suitable for the environment in which they are used Operation of these instruments in residential areas could cause unaccept able interferences to radio and TV equipment To maintain the EMC performance of equipment the recommended cables noted in the user s manual must be used Any variation introduced by the user to the supplied equipment may degrade the instruments EMC performance To avoid electrical shock do not use these instruments when voltage at the measurement surface exceed 24 Vac or 60 Vdc To avoid damage or burns do not perform any measurement in microwave ovens Unplug the instruments from power supply before the replacement of the fuse External cables to be connected to the rear panel should be terminated with cable lugs HANNA LITERATURE Hanna publishes a wide range of catalogs and handbooks for an equally wide range of applications The reference lit erature currently covers areas such as e Water Treatment e Process e Swimming Pools e Agriculture e Food e Laboratory e Thermometry and many others New reference material is constantly being added to the library For these and others catalogs handbooks and leaflets con tact your dealer or the nearest Hanna Customer Service Center To find the Hanna Office in your vicinity check our home page at www hannainst com TECHNICAL SERVICE CONTACTS Australia Tel 03 9769 0666 Fax 03 9769 0699 China Tel 10 88570068 Fax 10
54. sure that the instru ment functions correctly Any damaged or detective items must be returned in their original packing materials together with the supplied accessories GENERAL DESCRIPTION The product is a real time microprocessor based pH or ORP controller It provides accurate measurements flexible ON OFF or PID control capabilities and dual alarm sig nals The system is composed of a case inside which the signal conversion circuitry the microprocessor circuitry and the output power drivers are contained MAIN FEATURES OF DIFFERENT MODELS Display large LCD with 4 2 17 mm digits and 3 10 mm digits LEDs three mV 602 or four pH 502 LEDs are pro vided for signaling the energizing of relay 1 a yellow LED relay 2 a yellow LED in pH 502 series only and alarm relays a green and a red LED e Relays 1 or 2 output relays for acid or base dosage The models with electromechanical relay s have COM NO and NC contacts The models with solid state relay s have COM and NO contacts 1 output relay for alarm condition COM NO and NC contacts RS485 isolated communication link optional e Calibration and Setup procedures allowed only through an unlock password Calibration for pH 502 series at 1 2 or 3 points with pH 4 01 7 01 and 10 01 buffers for mV 602 series at 1 or 2 points at 0 350 and 1900 mV Temperature compensation of the HANNA standard buff ers for pH 502 series only Temperature co
55. tabi lize after having immersed the electrode in the calibration solution If the wrong password is entered the system reverts back and restarts displaying the pH value Calibration can be aborted by pressing SETUP before CFM Calibration is restarted with no changes to calibration data OFFSET AND SLOPE DIRECT SELECTION 42 Note Note Note Whenever the pH electrode offset and slope parameters are known it is possible to directly calibrate the meter entering the electrode parameters e Press the CAL DATA and then SETUP The LCD will show the default offset of 5 0 mV mV i CAL DATA CAL T m u S ry KI m ne Usingthe 0 0 and enter the electrode offset param eter the value must be between 100 and 100 mY Aas Confirm the value by pressing CFM If offset is invalid the WRONG indicator will blink on the LCD my z The LCD will then show the default a LI slope for Hanna electrodes 57 5 mV pH stad bat If CAL DATA or LCD are pressed before CFM calibration is aborted without changing the data of previous calibration e Usingthe 0 and enter the electrode slope param eter the value must be between 40 and 80 mV ph A e Confirm the value by pressing CFM If EI slope is invalid the WRONG indi cator will blink on the LCD Press LCD or CAL DATA to exit cali CAL bration The slope will be set to the a default value 57 5 mV pH Calibration
56. to return to the first CAL DATA display date at the time of last calibration A A STARTUP At startup the firmware release code scrolls through the LCD itis possible to escape trom code scrolling pressing any key During the automatic startup the Real Time Clock RTC is checked to see if a reset occurred since last software ini tialization In this case the RTC is initialized with the default date and time 01 01 1997 00 00 An EEPROM reset does not affect the RTC settings The EEPROM is also checked to see if it is new If this is the case the default values are copied from ROM and then the device enters normal mode Otherwise an EEPROM checksum test is performed the same is performed during EEPROM selftest procedure If checksum is correct normal mode is entered otherwise user is asked whether the EEPROM should be reset If EEPROM reset is requested default values from ROM are stored into EEPROM as would happen with a new EEPROM Note that EEPROM data is composed of setup data and calibration data As for the setup data the calibration data is assigned default values when an EEPROM reset occurs An un calibrated meter can perform mea surement though user is informed that pH calibration pH models or mV cali bration mV models is needed by means a blinking CAL icon When the last calibration data is re quired the no CAL message is displayed if no calibration procedure was perfo
57. tput the actual output level amplitude is varied rather than the proportion of ON and OFF times duty cycle control A device with analog input e g a pump with a 4 20 mA input can be connected to these terminals Models with this feature don t have the output relay for a duty cycle control IDLE MODE During idle mode the device performs the same tasks as when it is in control mode except for the relays The alarm relay is activated no alarm condition the acid and base relays are not activated while the analog output remains activated When the instrument is in idle mode the red and green status LEDs are on Idle mode is useful to disable control actions when the external devices are not installed or when the user detects unusual circumstances Control actions are stopped as soon as the user presses SETUP and en ters the password In order to reactivate the control mode use code 02 of setup see Setup section Otherwise the meter remains in idle mode 25 ANALOG OUTPUT 26 All models pH 502XY1 pH 502XY3 mV 602XY1 and mV 602XY3 are provided with the analog output feature The output is isolated and can be a voltage or a current With the recorder simply connect the common port to the ground output and the second port to A the current output or voltage output fe B e depending on which parameter is be At ing used as depicted aside C g round Outpul The type volt
58. trol and alarm status of the con troller This character can assume the following values e A control and alarm are ON e C control is ON and alarm is OFF e N control and alarm are OFF For example a possible answer to the TMR command is 103 lt STX gt 10 7C lt ETX gt meaning that the current temperature reading is 10 7 C the control action is active and no alarm condition is present 33 Note If asking for last calibration data and the controller was never calibrated it answers with 0 e g 01 lt STX gt O lt ETX gt If the controller was calibrated it answers with 1 followed by the calibration data The Data field of the answer has the following format pH 502 1 lt Dole gt lt Time gt lt Offet gt lt Skpe 1 gt lt Slo0e2 gt lt Bufl gt lt Buf2 gt lt Bu8 gt e Date DDMMYY e g 170400 for April 17 2000 e Time HHMM e g 1623 for 4 23 pm e Offset ASCII string e g 0 2 e Slope 1 ASCII string e g 62 5 e Slope 2 ASCII string e g 60 4 e Buf I ASCII string e g 7 01 e Buf 2 ASCII string e g 4 01 e Buf 3 ASCII string e g 10 01 mV 602 1 lt Date gt lt Time gt lt Bufl gt lt Buf2 gt e Date DDMMYY e g 170400 for April 17 2000 e Time HHMM e g 1623 for 4 23 pm e Buf 1 ASCII string e g 7 01 e Buf 2 ASCII string e g 4 01 The items in the Data field ar
59. ul Same as key MDR nul Request firmware code MVR nul Request mV reading mV602 only available in control or idle mode only PHR null Request pH reading pH502 only available in control or idle mode only PWD NNNN Send the 4 digit password SET NNPC C C C C Set setup item NN to the PC C C C C value P if value is greater than O P if value is less than O C can be O or 1 only C C C C can be 0 9 or blank the command is not available if the controller is in setup mode TMR null Request temperature reading 32 Note Ifthe controller is not in control or idle mode and the tem perature reading is requested through the TMR command the controller answers with the last acquired reading when it was in control or idle mode Note After a recognized PWD command is received the controller allows a maximum of 1 minute without receiving data after which it locks again and a new PWD command is needed to perform password protected operations Following are examples of commands for setup items 1 03 SET 12 01200 lt CR gt This command sets the setup item 12 relay 1 setpoint of a mV controller identified by the process ID number 03 to the 1200 mV value 2 01 SET 33 01500 lt CR gt This command sets the setup item 33 max relay ON time of a controller identified by the process ID number 01 to 15 minutes The 0 character means blank Once the controller has received a command it answers
60. vious measurements Definitely PID control provides more accurate and stable con trol than ON OFF controllers and it is best suitable in system with a fast response quickly reacting to changes due to ad dition of acid or base solution An example of how the response overshoot can be improved with a proper rate action setting is depicted in the following graphic A pH low rate Jf SS N an rate sarin g gt RATE ACTION COMPENSATES FOR RAPID CHANGES t PID TRANSFER FUNCTION The transfer function of a PID control is as follows Kp Ki s s Kd Kp 1 1 s Ti s Td with Ti Kp Ki Td Kd Kp where the first term represents the proportional action the second is the integrative action and the third is the derivative action gt DAC tne t Va out sP PLO KR gt PWM to relays pH or mV input Proportional action can be set by means of the Proportional Band PB Proportional Band is expressed in percentage of the input range and is related to Kp according to the following Kp 100 PB Controller output Proportional Band 20 In pH502 and mV602 the proportional action is set directly as Deviation in pH and mV units respectively Relation be tween Deviation D and PB is D Range PB 100 Each setpoint has a selectable proportional band PB1 for setpoint and PB2 for setpoint2 Two further parameters must be provided for both s
61. wer supply a 1 115 Vac power supply pH 502 XYZ a mV 602 XYZ a 1999 Hanna Instruments All rights are reserved Reproduction in whole or in part is prohibited without the written consent of the copyright owner PRELIMINARY EXAMINATION 20 4 GENERAL DESCRIPTION 0 00 4 FUNCTIONAL DESCRIPTION 0 000000005 6 MECHANICAL DIMENSIONS 7 SPECIFICATIONS pH 502 amp mV 602 8 INSTALLATION nace adda a hues eeend eee ee 9 SETUP MODE ta uae be bh gawd bleed eed donee 11 CONTROLMODE saaa dhe a eA A AE 17 IDLE MODE 13 20 28 doe dy DEA a a ee des 25 ANALOG OUTPUT ix jr ir aa aa titis 26 RS 485 COMMUNICATION 000 0 28 CALIBRATION cassan oe bas na a 35 LAST CALIBRATION DATA 0 eee 48 STARTUP is 3 bss eels ab Gwe Eee oa wd eS 5 FAULT CONDITIONS AND SELFTEST PROCEDURES 52 pH VALUES AT VARIOUS TEMPERATURES 56 ELECTRODE CONDITIONING AND MAINTENANCE 57 TAKING REDOX MEASUREMENTS l ACCESSORIES s agn ates ENA a 63 WARRANTY 1 0 0 0 00 ee ee eee eee eee nee 69 CE DECLARATION OF CONFORMITY 2 2 22 70 3 PRELIMINARY EXAMINATION Note Remove the instrument from the packing material and exam ine it carefully to make sure that no damage has occurred during shipping If there is any noticeable damage notify your Dealer or the nearest Hanna Customer Service Center immediately Save all packing materials until you are
62. with the following characteristics Data rate up to 9600 bps Communication Bi directional Half Duplex Line length up to 1 2 Km typ with 24AWG cable Loads up to 32 typ Internal termination none Excel Copyright of Microsoft Co Lotus 1 2 3 Copyright of Lotus Co Windows registered Trademark of Microsoft Co CONNECTIONS The connections for the 6 pin RS485 terminal provided 1 on page 7 are as follows RS485 1 fu w f R There is an internal short between the two A pins and be tween the two B pins The instrument has no internal line termination To terminate the line an external resistor equal to the characteristic line impedance typically 120Q must be added at both ends of the line RS485 line 120Q 1200 I i I Unit 1 Unit n Up to 32 units can be connected to the same RS485 line with a total line length of up to 1 2 Km using 24AWG cable To minimize electromagnetic interferences use shielded or twisted pair cable to connect the units Each pH502 mV602 unit is identified by its process ID num ber setup item O1 The pH502 mV602 controller acts as a slave device it only answers to commands received from a master device e g an industrial PC connected to the line 29 RS485 PROTOCOL 30 As additional feature the controller is also w e provided
63. with two pins 5V and OV in or tg der to apply the Fail Safe Open Line le protection method To avoid erroneous le readings in Open Line conditions pull a up and pull down resistors should be ll pt ov connected as shown The Fail Safe resistors are connected only to one unitin the line and their value depends on the application and char acteristic impedance of the connection cable The RS485 port is optoisolated from measuring circuit and power line If both analog output and RS485 port are present they have the same ground The commands sent to the controller must have the following format e 2 digit process ID number e 3 character command name e Parameters variable length may be null End of command always the CR character Hex OD A maximum time interval of 20 ms is allowed between two consecutive characters of a command It is possible to send commands to change the controller settings or to simply ask information on the controller status Following is the complete list of commands available Command Parameter Description CAR nul Request calibration data GET NN Request setup item NN KO nul Same as CFM 0 CAL keys K02 nul Same as LCD CAL SETUP keys KCD nul Same as CAL DATA key KCF nul Same as CFM key KCL nul Same as CAL key KDS null Same as LCD key KDW nul Same as key KRG nul Same as 0 key KST null Same as SETUP key KUP n

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