Manuals/EC 700 and EC 710 Controller
Contents
1. ing and an intermittent CFM will prompt LF the user to confirm the calibration e If the reading stabilizes at a reading significantly variant fromthe first calibration point an intermittent ERRO R will prompt the user to check the input e If everything is satisfactory the sec ondaryLCD will display 20 for the second calibration point e Set the mA simulator to 20 mA and wait for the reading to stabilize CAL will stop blinking and an intermittent CFM will ow prompt the user to confirm the calibra LF tion e Press CFM to confirm The meter will retum to normal op erational mode Calibration procedure may be interrupted by pressing CAL again atanytime If the calibration procedure is stopped this 33 way or if the controller is switched off before the last step no calibration data is stored in non volatile memory EEPRO M ANALOG OUTPUT CALIBRATION 34 IMPO RIANT 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 Itis recommended to perform the output calibration atleast once a year Calibration should only be performed after 10 minutes from power up e With a multimeter or an HI 931002 A connect the common port to the B E BE ground output and the second port E A Voltage Output to the current output or voltage out B Ground Oufpat put depending on which parameter Curent ut2. Output isolated 0 1 mA 10 KW maximumload optional isolated 0 20 mA 750 W maximumload optional isolated 4 20 mA 750 W maximumload optional isolated 0 5 VDC 1 KW minimumload optional isolated 1 5 VDC 1 KW minimumload optional isolated 0 10 VDC 1 KW minimumload optional Real time clock FUNCTIONAL DESCRIPTION REAR RANEI r o I FRONT PANEL a lo D S moDeL no a fel 8 wo Primary DP mie CEE Le uS mS pom pot DATE TME Display n ONLY SERVICE PERSONNEL A N HOO oa U LOLOL T a EN Tref TDS FACTOR a Mel i Se me IAB INEHO z Saa a B2 as x e 3 S pO A E40 o 1 Analog O utput 2 Power Supply 3 Alarm Teminal 1 Liquid Crystal Display 4 Ee Aada Second Dosing Terminal 2 SETUP key enters setup mode 3 si 3 CFM key confirms current choice and skips to the next item Contact 1 First Dosing Tervinal 4 CAL key initiates and exts calibration mode 8 Pt 100 Temperature Sensor connector 5 ff key increases the blinking digit letter by one when selecting a 9 EC TDS probe connector parameter Advances forward while in last calibration data 10 Power supply output for extemal transmitter viewing mode Increases the temperature setting when f z p temperature probe
3. 2420nA 305 L 412 5 C0 5 O10VG0 4 Adqgaipt otio sale oO ro lonerlinit O ARMN O AMN O MX F s Adgatpt Ugse linit O ARVES otwtiovfUl sde 100 f s ro O 4EMN O MMX F s 15 ce vaidus Defeut PW Gret dy awaz frov RIC ro GL Gret noth atw fian RC ro Gret yer 19802 fonr RIC ro amp Grettne cn coto 2359 fray RIC ro 72 desrirotiner Oto PBs o ro Z Initia derirgcy atz a ro M Inid derirgnath tol a ro 7 Inta derirgyer 19288109229 1998 ro 7 Initia derirgtine On 00to 2359 0 00 ro 77 Gaig Nirma Oto19999 nin tes o ro 9 Ddaysditet adf o yes Lra a ebordsditest adf o yes Lra 2 BPM adf o yes Lra B MasadiHE gt s ftet Od o yes roa A Vidogtet adf o yes roa 2 Ulakpassvod feseeec s coco yes The process controller automatically checks to ensure that the entered data matches other related variables If a wrong configuration is entered ERRO R blinks on the LCD to prompt the user The correct configurations are the following If M140 then S1 lt HA S1 gt LA If M20 then S2 lt HA S2 gt LA If M1 1 then S1 H1 gt LA If M1 2 then S1 H1 lt HA If M1 3 then S1 D1 lt HA If M1 4 then S1 D1 gt LA If M2 1 then S2 H2 gt LA If M2 2 then S2 H2 lt HA If M2 3 then S2 D2 lt HA If M2 4 then S2 D2 gt LA lf M1 1 and M2 2 then S1 H1 gt S2 H2 S2 gt LA HA gt S1 lf M1 2 and M2 1 then S2 H2 gt S1 H1 S1 gt LA HA gt S2 lfM
4. 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 User can disable the derivative and or integrative action for P or PI controllers by setting Td O and or Ti MAX Ti respectively through the setup procedure SIMPLE TUNING PRO CEDURE The following procedure uses a graphical technique of ana lyzing a process response curve to a step input 1 Starting from a solution with an EC or TDS value quite different from the dosed liquid tum on the dosing device atits maximum capacity without the controller in the loop open loop process Note the starting time 2 After some delay m the EC or TDS stars to vary After more delay the EC or TDS will reach a maximum rate of change slope Note the time that this maximum slope occurs and the EC or TDS value at which it occurs Note the maximum slope in EC or TDS per minute Tum the system power off 3 O nthe chart draw a tangentto the maxmumsope point until intersection with the horizontal line corresponding to the initial EC or TDS value Read the sytemtime ddayTxon thetine axs A EC or TDS f f Sl ri max slope To time 4 The deviation Ti and Td can be calculated fromthe following e Deviation Tx max slope EC TDS e Ti Tx 0 4 minutes e Td Tx 0 4 minutes 5 Set the above parameters and resta
5. WS 12 CONTROLMODE 2 a eE a ee 18 DILEMO DE io one E Sad R E aaa 26 ANALOG OUTPUT 4 diya Aege Ga es a 27 CALIBRATION i 0 05 soe aes ee ae a a ea a al 28 LAST CALIBRATION DATA 0 2 eee 36 FAULT CO NDITIO NSAND SELFTEST PRO CEDURES 37 EXTERNALFUNCTIONS 2 0 00000000 eae 40 STARTUP a cane Mores eyed he eet See ets 41 EC VALUES AT VARIO USTEMPERATURES 42 EC TDSPROBEMAINTENANCE 005 43 ACEESSO RIBS Seu cones a EEE ee aie Shae Ae 44 WARRANTY 35 cor cnc gh cinerea tena a tite ahaa obs eat fee rr aanietos 46 CEDECLARATION OF CONFORMITY 47 PRELIMINARY EXAMINATION Remove the instrument from the packing material and eam 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 C enter immediately Save all packing materials until you are sure that the instru ment functions correcty Anydamaged or defective items must be retumed in their original packing materials together with the supplied accessories GENERAL DESCRIPTION EC 700 TDS 705 and EC 710 are real time microprocessor based EC or TDS controllers They provide accurate measurements flexible O N O FF or proportional control ca pabilities analog input and output dual setpoint and alarm signal The system is composed of a case inside which the signal conversion circuitry the microprocessor circuitryand the output
6. While in hold state itis possible to display the temperature reading on the secondary LCD pressing the right arowkey Onlywhen the key LF is released the secondary LCD retums auto matically after a few seconds to the HId indication PRESETTABLE TIMER CLEANING FUNCTION 40 Atimer is presettable by software to open a digi TIMER tal insulated contact terminals 5 on page 7 e after a user programmable time interval with a Q0 minimuminterval of 1 day e g for probe dlean ing function The time interval is progranmable in number of days through setup code 72 This output is O N for the period set through setup code 77 this period can be also changed when the output is ON The starting time of the cleaning timer can be set through setup codes 73 74 75 and 76 STARTUP During the automatic startup the Real Time Clock RTC is checked to see if a reset occurred since last software initial ization In this case the RTC is initialized with the default date and time 01 01 1998 00 00 An EEPRO M reset does not affect the RTC settings The EEPRO M is also checked to see if it is new If this is the case the default values are copied from RO M and then the device enters normal mode O therwise an EEPRO M check sum testis performed the san is performed during EEPRO M selftest procedure If checksumis correct normal mode is entered otherwise the user is asked whether the EEPRO M should be res
7. is not inserted 11 4 20 MA input from exemal transmitter 6 CAL DATA key last calibration data viewing enters and exits Unplug the meter before any electrical connection 7 U key decreases the blinking digity letter by one when selecting a parameter Reverts backward while in last calibration data M ECHAN CAL DIMEN Sl O N S viewing mode Decreases the temperature setting when temperature probe is not inserted 8 LCD key exits from setup and reverts back to normal mode in idle or control phases with the measurement on the display During EC TDS calibration it alternates EC TDS buffer value and current cell constant on the display In EC 710 model only it switches between EC and TDS reading E E E 9 gt key moves to the next digit letter circular solution when se 2 ig 3 lecting a parameter Same as key during last calibration aay E data viewing mode 10 LEDs 138 0 mm 144 0 mm 140 0 mm 165 0 mm FRONT VIEW SIDE VIEW SPECIFICATIONS INSTALLATION Ranges QOWI uS 0t01999 1S BC EC710a01 WT aco oe ao eee near EC 7 00 103 208 nl e to to i and EC 710 offer a z i ek aoto 1000 Gam 001000 A111 75 E10 aiy i ae h multitude of possibili amw naO p QOO INO pt OE7 E710 aty k z H az ties from single and ahs G 100t01000 C 8 dual setpoints to O N 2 Reduion Q1uS 1uS amp 7O EC71ING1y OFF or PID dosage B QOLNS Q1NS KCO700 EC7IOG1y isolated
8. power drivers are contained MAIN FEATURES OF DIFFERENT MO DELS e Display large LCD with 4 17 mmdigits and 3 1 2 10 mm digits e LEDs four LEDs are provided for signaling the energizing of relay 1 and 2 yellow LEDs and alarm relays a green and a red LED e Relays 1 or 2 output relays for low conductivity or high conductivity dosage CO M NO and NC contacts and 1 output relay for alarm condition CO M NO and NC con tacts e Calibration and Setup procedures allowed only through an unlock password e Calibration 2 points with Hanna EC and TDS calibration solutions e Four different EC working ranges O to 199 9uS O to 1999S O to 19 99mS O to 199 9MmS for EC 700 and EC710 models Four different TDS working ranges O to 100 0ppm O to 1000ppm O to 10 00ppm O to 100 0ppm for TDS705 model Possibilityto switch to TDS measurements with conversion factor from0O 00 to 1 00 EC 710 only Temperature compensation of the HANNA standard solu tions Temperature compensation of the EC and TDS reading with temperature coefficient B selectable from 0 to 10 C Manual temperature setting when the temperature probe is not inserted or temperature exceeds the upper range Last calibration data intemally recorded non volatile EE PRO M memory calibration date and time cell constant calibration solution values Input 4 ring EC TDS probe with cell constant 2 0 10 or 4 20mMA analog input froma transmitter
9. two wires of one end to pins 2 Pe 100 z i 118 and 3 pin 2 is an auxiliaryinputto com a Pt 100 pensate for the cable resistance and one 2 wire from the other end to pin 1 Leave ae the fourth wire unconnected if present e MA Input to switch to mA input signal froma If the meter does not detect the temperature probe it will switch automatically to manual temperature compensation with the temperature adjustable through the up and down arrowkeys The C symbol will blink on the LCD All external cables to be connected to the rear panel should be ended with cable lugs e Analog output Connectan extemal recorder with a 2 wire cable to these terminals 1 on page 7 paying attention to the correct polarity A wide variety of output signals either in V or in mA is available to fit most standards e Contact 1 and 2 Connect the dosing devices to these terminals 4 and 7 on page 7 in order to activate and deactivate them according to the selected control param eters conductivitytransmitter e g HI8936 HI98143 INPUT or HI98144 series see setup procedure code lt 1 O 6 Connectthe two signal wires fromthe trans aN e mitter to tenvinals 11 on page 7 paying at tention to the correct polarity POWER SUPPLY An unregulated 10 30 VDC 50 mA max Jok power supply output 10 on page 7 is pro N e vided to power the transmitter if needed Once the installation is completed se
10. 1 3 and M2 2 then S1 gt S2 H2 S2 gt LA HA gt S1 D1 If M1 2 and M2 3 then S1 H1 lt S2 S1 gt LA HA gt S2 D2 IfM1 4andM2 1 then S1 lt S2 H2 S1 D1 gt LA HA gt S2 If M1 1 and M2 4 then S1 H1 gt S2 S2 D2 gt LA HA gt S1 lfM1 3 and M2 4 then S1 gt S2 S2 D2 gt LA HA gt S1 D1 If M1 4 and M2 3 then S2 gt S1 S1 D1 gt LA HA gt S2 D2 where the minimumdeviation D1 or D2 is O 5 of the max mumrange value When a wrong setup value is confirmed the controller does not skip to the next setup item but remains in the current item dis playing a flashing ERRO R indicator un til the parameter value is changed by the user the same is also true for the setup code selection In some circumstances the user cannot succeed in setting a pararreter to a desired value if the related parameters are not changed beforehand e g to seta EC high setpointto 10 0 mS the high alarm must be set to a value greater than 10 0 mS first 17 CONTROL MODE RELAY MODES 18 The control mode is the normal operational mode for these meters During control mode the meter fulfills the following main tasks e converts information from EC TDS and temperature inputs to digital values e controls relays and generates the analog outputs as deter mined by the setup configuration displays alarm condition In EC 710 mode itis possible to switch between EC and TDS reading pressing LCD The TDS value is obtained mu
11. 2a 8 1910 1505 7 700 100 417 2 716 T2150 132 7 Axx 1 4711 B3 B4 12380 1359 al 7O 100 4505 4 7S2 T2640 1585 amp 73300 1080 422 5 77 128580 1413 a axo 111800 5000 788 13150 1440 s amp s azo nUD 5086 27 D6 15837 1467 37 awo n570 510 3B v4 180 1494 B z 11770 25 2 A2 13870 1821 3300 UJO 5B 3s amp 14120 1558 o amp 0 IAO SP 21 878 14870 1545 4 00 123800 55 EC TDS PROBE MAINTENANCE Probe can be compensated for normal contamination bya process of recalibration When calibration can no longer be achieved remove the conductivity probe from the system for maintenance PERIO DIC MAINTENANCE Inspect the probe and the cable The cable used for the con nection to the controller must be intact and there must be no points of broken insulation on the cable Connectors must be perfectly clean and dry CLEANING PRO CEDURE Note Rinse the probe with tap water If a more thorough cleaning isdesired remove the sleeve and clean the platinum sensors with a non abrasive cloth or HI7061 cleaning solution Re insert the sleeve in the same direction as before Recalibrate the instrument before reinserting the probe in the system Alweys recalibrate the instrument when attaching a new probe 43 ACCESSORIES CONDUCTIVITY amp TDS BUFFER SOLUTIONS HI 7030L 12880 uS cm unho cm 460m HI 7030M 12880 uS cm unho cm 230m HI 7031L 1413 uS cm umho cm 460m HI 7031M 1413 uS cm umho cm 230m HI 7033L 84 u
12. HANNA instruments EC 700 TDS 705 EC 710 Process Panel mounted Microprocessor based Conductivity and TDS Controllers Instruction Manual Dear Customer Thank you for choosing a Hanna Product This instruction manual has been written for the following products EC 700 EC controller with dual setpoint O N O FF and PID control analog output TDS 705 TDS controller with dual setpoint O N O FF and PID control analog output EC 710 EC and TDS controller with dual setpoint ON OFF and PID contol analog output Please read this instruction manual carefully before using the instument It will provide you with the necessary information for the correct use of the insttument as well as a precise idea of its versatility These instruments are in compliance with C directives EN 50081 1 EN 50082 1 and EN 61010 1 1999 Hanna Instuments All rights are reserved Reproduction in whole or in partis prohibited without the written consent of the copyright owner Hanna Instruments Inc 584 Park East Drive Woon socket Rhode Island 02895 USA HANNA ISO 9000 Certified instruments Company since 1992 TABLE OF CONTENTS PRELIMINARY EXAMINATION 0 0 00 00 000000 4 GENERALDESCRIPPTION 0 00000 4 FUNCTIONALDESCRPTION 0005 6 MECHANICALDIMENSIONS 2 0 00 0005 7 SPECIFICATIONS ies hee ees Ba eg le 8 INSTALLATION foc escent 9 SETUP MODE Taa a e eek ah a ace tic atl a ane Mae cae
13. LCD e Use the arrow keys to set on the secondary LCD the tem perature read by the reference thermometer e When the reading has stabilized at a value near the cali bration point CAL will stop blinking and an intermittent CFM will prompt the user to confirm the calibration e If the reading stabilizes at a reading significantly variant from the first setpoint an intermittent ERRO R will prompt the user to check the beaker or bath Calibration procedure may be interrupted by pressing CAL again atanytime 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 EEPRO M ANALOG INPUT CALIBRATION The analog inputis already factory calibrated However the user may also performa 2 point calibration at4 and 20 mA Itis sufficientto perform the calibration on one range only e Connect a mA simulator e g HI931002 to the analog input of the controller 11 at page 7 e Press and hold first CFM and then CAL to enter the analog input cali gut bration mode LF LF Execute the password procedure e Selectcode 0 via the arrow keys for analog input calibra tion and confirm with CFM CAL will blink on the LCD e ThesecondaryLCD will display 4 for the first calibration point The primary LCD will display the con ductivity reading e Setthe mA simulator to 4 mA and wait for the reading to stabilize CAL will stop blink ow
14. S cm unho cm 460 mL HI 7033M 84 uS cm unho cm 230 mL HI 7034L 80000 uS cm unho cm 460m HI 7034M 80000 uS cm unho cm 230m HI 7035L 111800 uS cm umho cm 460m HI 7035M 111800 uS cm unho cm 230m HI 7039L 5000 uS cm unho cm 460mL HI 7039M 5000 uS m unho cm 230m HI 7032L 1382 ppm mg L 460 mL HI 7032M 1382 ppm mL 230 mL HI 7036L 12 41 ppt g L 460 mL HI 7036M 12 41 ppt g L 230 mL HI 70038P 6 44 ppt g L 25 mLsachets 25 pcs HI 70080P 800 ppm mg L 25 mL sachets 25 pcs HI 7042 42 ppm mg L 1 L HI 7038 6 44 ppt g L 1 L HI 7037 800 ppm mg L 1 L HI 7055 55 9 ppt g L 1 L CONDUCTIVITY BUFFER SOLUTIONS IN FDA APPROVED BOTTLES HI 8030L 12880 uS cm unho cm 460 mL HI 8031L 1413 uS cm umho cm 460 mL HI 8033L 84 uS cm unho cm 460 mL HI 8034L 80000 uS amp m unho cm 460 mL HI 8035L 111800 uS cm unho cm 460 mL HI 8039L 5000 uS cm unho cm 460 mL 44 ELECTRO DE CLEANING SOLUTIONS HI 7061M General Cleaning Sol 230 mL HI 7061L General Cleaning Sol 460 mL ELECTRO DE CLEANING SOLUTIONS IN FDA APPROVED BOTTLES HI 8061M General Cleaning Sol 230 mL HI 8061L General Cleaning Sol 460 mL OTHERACCESSORIES HI 7639 4 ring EC TDS probe with built in 3 wire PTLOO temperature sensor and 5 nt shielded cable BLPUMPS Dosing Pumps with Flow Rate from 1 5 to 20 LPH ChecktenjoC Stick Thermometer range 50 0 to 150 0 C HI 8936A EC Transmitter 0 0 199 9 mS
15. TPUT Models EC 700 TDS 705 and EC 710 have a proportional analog signal selectable among O 1mMA 0 20NA 4 20MA 0 5VDC 1 5VDC and 0 10VDC atthe analog output ter minals With this output 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 tenminals 25 IDLE MODE 26 Idle mode is entered through setup code 2 During idle mode the device performs the same tasks as when itis in control mode except for the relays The alarm relayis activated no alarm condition the control relays are not activated while the analog output remains activated When the instrumentis in idle mode the red and green status LEDs are on EC 700 statu CAL O P TO CFM t J HANNA instruments Idle mode is useful to disable control actions when the exter nal devices are notinstalled or when the user detects unusual circumstances Control actions are stopped as soon as the user presses SETUP and enters the password In order to reactivate the control mode use code 02 of setup see Setup section Otherwise the meter remains in idle mode ANALOG OUTPUT All models 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 A common portto the ground outputand DiE the sec
16. action the second is the integrative action and the third is the derivative action DAC sp 4 O PL E l f pa E PWM to relays D EC or TDS 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 100 Gridi atpt 21 The proportional action is set through the setup procedure as Deviation in percent of full scale of the selected range Each setpoint has a selectable deviation D1 for setpoint1 and D2 for setpoint2 Two further parameters must be provided for both setpoints Ti Kp Ki reset time measured in minutes Td Kd Kp rate time measured in minutes Til and Td1 will be the reset time and rate time for setpoint1 while Ti2 and Td2 will be the reset time and the rate time for setpoint2 TUNING A PID CONTROLLER 22 The proportional integrative derivative terms must be tuned i e adjusted to a particular process Since the process vari ables are not typically known a trial and error tuning procedure must be applied to get the best possible control for the particular process The target isto achieve a fast response time and a small overshoot Many tuning procedures are available and can be applied to the EC TDS controllers A simple and profitable procedure is reported in this manual and can be used in almost all applications
17. alibration FAULT CONDITIONS AND SELFTEST PROCEDURES DISPLAY SELFTEST The fault conditions below may be detected by the software e EEPRO M data error e 12C intemal bus failure e date lost e code dead loop EEPRO M data error can be detected through EEPRO M test procedure at startup or when explicitly requested using setup menu When an EEPRO M error is detected user is given the option to performa reset of EEPROM When an EEPROM reset has been per formed calibration data are reset to default every range An intenmittent CAL will blink on the display to advise the user of this Status A I2C failure is detected when the I2C transmission is not acknowledged ora 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 I2C bus If so the controller stops any tasks and displays a perpetual sliding message Serial bus error i e this is a fatal error If an invalid date is read fromRTC itis initialized back to the default date and time 01 01 98 00 00 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 cons
18. ance of its products without advance notice CE DECLARATION OF CONFORMITY a instruments cE DECLARATION OF CONFORMITY We Hanna Instruments Italia Srl Via E Fermi 10 35030 Sarmeola di Rubano PD ITALY herewith certify that the microprocessor based process controllers Ec 700 TDS705 EC 710 have been tested and found to be in compliance with the following regulations IEC 801 2 Electrostatic Discharge TEC 801 3 RF Radiated IEC 801 4 Fast Transient EN 55022 Radiated Class B EN 61010 1 Electrical Safety fo Bes ib Date of Issue 25 1 1999 D Volpato Engineering Manager On behalf of Hanna Instruments S r l Recommendations for Users Before using these products make sure that they are entirely 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 users 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 24VAC or 60VDC To avoid damage or bums do not perform any measurement in microwave ovens Unplug the instruments from power supply before the replacement of the fuse Extemal cables to be connected to the rear
19. ask for the offset calibration displaying zero on the LCD press CAL to exit or calibrate the offset if desired The EC or TDS calibration value shown is referenced at 25 C even if the reference temperature of 20 C has been selected During calibration press LCD to display the cell constant value on the primary display Press LCD again to retum to calibration buffer visualization Note To interrupt the calibration procedure press SETUP to restart the procedure or CAL to exitto normal operational mode If the process meter has never been calibrated or an EE PRO M reset has occurred the meter continues to perform measurements However the user is informed of an EC or TDS calibration requirement by a blinking CAL indication see Startup section The device must be calibrated within the temperature range specified for the EC or TDS buffer solution CELL CONSTANT DIRECT SELECTION Whenever the EC TDS probe cell constant is known it is possible to directly calibrate the meter using that value e Press CAL to enter calibration mode The LCD will show the default offsetof O e Press LCD to display the current cell constant on the pri maryLCD factory default value is 2 000 cm amma Cees e Press SETUP key e Using t 2 and enter the probe cell constant the value must be between 1 333 and 4 000 cm and con finmby pressing CFM If the entered cell constant value is invalid the ERRO R indi ca
20. cm HI 8936B EC Transmitter 0 00 19 99 mS cm HI 8936C EC Transmitter 0 1999 US cm HI 8936D EC Transmitter 0 0 199 9 US cm HI 98143 series 4 20mMA EC Isolated Transmitter 0 10 mS cm HI 98144 series 4 20nm A EC Isolated Transmitter 0 4 mS cm HI 931002 4 20 mA Simulator 45 WARRANTY 46 All Hanna Instruments meters are guaranteed for two years against defects in workmanship and materials when used for their intended purpose and maintained according to instructions The probes are guaranteed for a period of six months This warranty is limited to repair or replace ment free of charge Damage due to accident misuse tampering or lack of pre scribed maintenance are not covered If service is required contactthe dealer from whom you pur chased the instrument If under warranty report the model number date of purchase serial number and the nature of the failure If the repair is not covered by the warranty you will be notified of the charges incurred If the instrument is to be retumed to Hanna Instruments first obtain a Returned Goods Authorization number fromthe Customer Service de partment and then send it with shipping costs prepaid When shipping any instrument make sure it is properly packaged for complete protection To validate your warranty fill out and retum the enclosed warranty card within 14 days from the date of purchase Hanna Instruments reserves the right to modify the design construction and appear
21. display 0000 on the upper part and PAS on the lower The first digit of the upper part of the LCD will blink e Enter the first value of the pass word by the ff or keys e Then confirm the displayed digit with gt and move to the next one When the whole password has been inserted press CFM to confirmit The default password is set at 0000 e The LCD will display SET on the upper part and c 00 on the lower allowing the user to edit setup param eters see table below e Enter the code of the parameter you wantto set using the arrow keys as per the password procedure above e g 41 e Confirmthe 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 confirmed 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 13 e After confirmation the salected parameter is digolayed The user can scroll through the parameters bypressing CFM Inorderto directysetanother param eter press SETUP again and enter the ser code or scroll to it by pressing CFM LF The following table lists the setup codes along with the descrip tion of the specific setup items their valid values and w
22. e COM and NO No Normally O pen or NC Normally Closed ten7vinals fom The ON relaystate occurs when relay is energized NO and COM connected NC and CO M disconnected The O FF relay state occurs when relay is de energized NO and CO M disconnected NC and CO M connected The following graphs show relay states along with EC mea sured value similar graph can be derived for TDS control As shown below a high setpoint relay is activated when the measured EC exceeds the setpoint and is deactivated when it is below the setpoint value minus hysteresis ON l l 5 Spirt Sat EC Haecis Such a behavior is suitable to control a high conductivity dosing pump A low setpoint relay as can be seen from the following graphs is energized when the EC value is below the setpoint and is de energized when the EC value is above the sumof setpoint and the hysteresis The low setpoint relay may be used to 19 PI D CONTROL MODE 20 control a low conductivity dosing pump l l l 3 Sap rt Spirt EC Haeesis PID control is designed to eliminate the cycling associated with O N OFF contol ina 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 dimin
23. e primary LCD will display the second expected buffer value 29 Cell constant calibration 30 Ifthe ro calibration cannotbeperformed ERRO R will blink e Selectthe solution value on the primary display by pressing t 1 or amp if the selected range has LS LS two possibilities e g 5 000 and 12 880 n6 Immerse the EC TDS probe with the temperature sensor in the selected solution The level of solution must be higher than the holes of the EC TDS probe sleeve Tap the EC TDS probe repeatedly on the bottom of the beaker and stir to ensure that no air bubbles are trapped inside the sleeve e When the reading is stable CAL will stop flashing after about 30 sec onds and the READY and CFM indicators will blink e Press CFM to confim the calibra tion point if the reading is close to the selected solution the meter stores the reading If the reading is not close to the se lected solution ERRO R will blink A 2 point calibration is always suggested However the EC TDS calibration can also be performed at 1 point To cali brate offset only just press CAL after confinmation with CFM of the zero reading the meter will retum to normal opera tional mode To have the cell constant calibrated first press the up or down arrowkeys after entering the calibration pro cedure to skip to the next possible calibration buffer In this case after confirmation of the cell constant the meter will
24. ecse 20N t ul f 4 V gt qqpvinateay 16 kg 351b a TIN Fy 728i et ANALOG RECORDER o Note acid ToSraoefo R7100 Laors EE METER 4 20 mA 10 e Power Supply Connecta 3 wire power cable D to the teminal strip while paying attention SIN to the correct live L earth PE and neu tral N terminal connections S Power 115VAC 100 mA 230VAC 50 mA Live Contact fused inside 200mMA PE leakage current 1 nA this contact must be con nected to ground Conductivity input the default input is from conductivity probe Connect the EC probe to the terminals 9 on page 7 Connect the cable shield to pin 1 and the other four wires according to the following table EC TDS PROBE Color Pin aa 1 Shield G REEN el2 WHITE 3 l3 RED 4 el4 BLUE 5 6 5 Pt 100 Terminals these contacts 8 on page 7 connect the Pt 100 temperature sensor for automatic temperature compensation of measurement The HI7639 EC TDS probe has a built in 3 wire Pt 100 sensor to be connected ac cording to the following table Color Pin Pt 100 GRAY 6 6 2 BRO WN 7 70 8S YELLOW 8 If using a different Pt 100 connectitas explained below In the case of a 2 wire sensor connect F 5 the Pt 100 to pins 1 and 3 and short 20 Pt 100 pins 2 and 3 with a jumper wre 316 Ifthe Pt100 has more than 2 wires con nect the
25. et If EEPRO M reset is requested default values from RO M are stored into EEPRO M as would happen with a new EEPRO M 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 EEPRO M reset occurs An ur calibrated meter can perfonm measurement though user isinformed that EC or TDS calibration is needed by means of a blinking CAL When the last calibration data is re quired the no CAL message is displayed if no calibration procedure was performed Unlike EC TDS calibration the user has no information on calibration need for other ranges other than the awareness that EEPRO M was reset After an EEPROM reset all calibrations input and output have to be performed in order to obtain correct measure ments 41 EC VALUES AT VARIOUS TEMPERATURES 42 Temperature has a significant effect on conductivity Table below shows EC values at various temperatures for the Hanna calibration solutions TEVPERATURE EC VALUES uS cm C F H V H HB HIM HS HAD Hees H amp A HS HM H amp S HSE Oo Ww 7150 776 a 45500 amp D 2760 5 41 6 Ss 5500 7M0 3150 10 5D BD 100 67 0 315 I5 BP 10480 147 B oO DDO 4053 16 8 10720 11773 7 6720 QMO 4155 7 6 100850 puies 7L e500 eas 13 644 1190 125 B a0D 43537 19 6 amp 2 10450 IS 7 730 100200 429 Dd 11670 1273 7 720 1 100 B33
26. he analog output minimum and maxXmumare 41 or 42 respectively For the exact pro cedure refer to the setup mode section in the manual The analog output is factory calibrated through software The user may also performthe calibration procedure as explained in the following It is recommended to perform the output calibration atleastoncea year Analog output resolution is 1 5 of s with O 5 f s accu racy The analog output is frozen when entering the setup or calibration mode after password confirmation The controller is factory calibrated for temperature as well as for the analog input and outputs The user should periodically calibrate the instrument for EC or TDS For greatest accuracy it is recommended that the instument is calibrated frequently Before beginning normal operation itis recommended to stan dardize the probe with the Hanna calibration solution close to the expected sample value and inside the selected range EC AND TDS CALIBRATION 28 The calibration points for EC and TDS are as follows Range Calibration point s 0 0 199 9 uS 84 0 uS 0 1999 uS 1413 uS 0 00 19 99 nS 0 0 199 9 mS 5 00 12 88 nS 80 0 111 8 nS 0 0 100 0 ppm 42 0 ppm 0 1000 ppm 800 ppm 0 00 10 00 ppt 6 44 ppt 0 0 100 0 ppt 55 9 ppt Initial Preparation Offset Calibration The user should selectthe appropriate range to calibrate setup code 03 Calibration mustbe performed for each range u
27. hether password is required to view that item PW column Gece Valid Valuss Dait PW FatoyiD Ow 0389 ro a RoesiD owt coco ro r eedigdside Q CM dsehied oO ro rI CM esde Re 1 QOIS US Tr INOM 4 ro heaton 2 OPUS 1000997 3 Q00 19299NS c1000 R 4 00 1999nS a 10007 9 Rfeowtepedue 20 Qr 25C Zac ro eopedueCeafidet Qo00tw10 00 C 200 ro Co ImtSdetiom Q ad divtypd oO ro r 420nAirnoatsga O7 Tenpecue AIG Aitcatic AIC ro anpe sdin Use Mna LSrato K700i Addto100 a50 ro uu Rdayinae Q dsid oO ro ML Lt ONOFHidchstpdrt 2 ONOF lovs p rt 3 AD hh srt 4 AD lonsspdrt 2 Re ay1lssport Sb OQ5DEa5 ful sde Bes ro B Raay1lhaecis HbD OwSs fs Ifs ro 14 Gece vaidus Defeuit PV 14 Rtay1ilcaiaiaon Db Q5tw010 fs Ifs ro 15 May lresttine alb 9nmMmites A9 ro 16 Rday1lrdeetne aob nintes ao ro 21 Rday2nack Vpb sneciday1 oO ro 22 Reday2ssport S astal sale T3 fs ro 23 Rda2haeeais Hy Owscfs Ifs ro 2 Rday2caiaiaon D Q5tw010 fs Is ro 5 Rta2resttine Q1tvoee nmiss A9 ro 2 Rday2reaetne Q0oto29 nites ao ro 30 RtayShchdamH O5n0ecful sae CBs ro HAH LA HSHs LIES H SlaHye 2 a RAtay3londamilaA asra ful sale Ses ro LA Hs LAH SHse 15 s l4_ Slab 2 2 RAaotocd atd 1to30nm 5 ro naobpsica 3 MemmdaWtine 1to10nm 10 ro ata Wicdi midannactisetead 4 Aammasktine 00 0 01 e 0100 00 00 ro A Adqgaiptsdeatm AINA 2 ro Ir O2nA
28. ishes The following graph describes the EC TDS process controller behavior Similar graph mayapplyto the controller maai ss 7 PRE DEZ oee During proportional control the process controller calculates the relayactivation time at certain moments ty t T t 2T etc The ON interval the shaded areas is then dependent on the error amplitude With the integral function reset the controller will reacha more stable output around the setpoint providing a more accurate control than with the O N OFF or proportional ac tion only The derivative function rate action compensates for rapid changes in the system reducing undershoot and overshoot of the EC or TDS value During PID control the ON interval is dependent notonlyon the error amplitude but even on the previous measurements Definitely PID control provides more accurate and stable con trol than O N O FFF controllers and itis best suitable in system with a fast response quickly reacting to changes due to ad dition of lowor high conductivity solution An anple of howthe response overshoot can be improved with a proper rate action setting is depicted in the following graphic A EC low rate proper rate setting 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
29. ists of lighting up all of the display segments together The Display testis announced bya 37 KEYBOARD SELFTEST 38 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 CALand SETUP together to escape The LCD will then showonlya colon PL As soon as one or more keys are pressed the appropriate segments out of 8 8 88 corresponding to the pressed keys will light up on the screen EC 700 CAL apoE For example if CFM and CAL DATA are pressed together the LCD will look like this The colon is a useful indicator for the correct position of squares Amaximumof two keys may be pressed simultaneously to be properly recognized To exit the keyboard test ser procedure press LCD CAL and SETUP simultaneously EEPROM SELFTEST RELAYS AN D LEDS The EEPRO M selftest procedure involves verifying the stored EEPRO M checksum If the checksum is correct the Stored data good message will be shown for a few seconds before exiting selftest procedure If not the message Stored data error Press ff to reset stored data or gt to ignore If S is pressed the EEPROM selftest procedure terminates with no other action O therwise EEPRO M is reset with de fault values from ROM as when a device with a virgin EEPRO M is switched on Duri
30. lect the appropriate working range the reference temperature 20 or 25 C and perform conductivity or TDS calibration as described in this instruction manual Set the control parameters according to the process 11 SETUP MODE EC 700 TDS 705 and EC 710 offer a multitude of possi bilities fromO N O FF or PID dosage to analog recorder output and fromalarmto 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 ser and entering the password when the device is in idle or control mode LF Generally speaking if the password is not inserted the user can only view the setup parameters except for password without modifying them and the device remains in control mode An exception is certain setup items or flags which can activate special tasks when set and confirmed 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 itemis saved on EEPROM and the following item is displayed Whenever LCD is pressed the de vice reverts back to control mode ow The sarre is true when CFM is LF LF pressed on the last setup item The possible transitions in setup mode are the following EN TERING THE PASSWO RD 12 e Press SETUP to enter the setup mode The LCD will
31. ltiply ing the EC measurement by the TDS factor set through setup The EC 700 displays EC only The TDS 705 displays TDS only with a TDS factor fixed at 0 5 The status of the meter is shown by the LED s on the right SNE E gt Cria Aam Amg Rido ReILED Or ON Or ON ON OF ON Wa OF Or ON ON OF Na OF Birkirg Meter exits control mode by pressing SETUP or CAL and confirming the ser password Note that this command LF LF generates a temporary exit To deact vate the control mode definitively setC O NTRO L ENABLE to O item 02 Once enabled the relays 1 and 2 can be used in four differ ent modes 1 ON OFF high setpoint low conductivity dosage 2 ON OFF lowsetpoint high conductivity dosage 3 PID lowsetpoint low conductivity dosage 4 PID high setpoint high conductivity dosage An upper boundary is imposed for dosage time when relays are energized continuously i e when relay works in ON OFF mode or also 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 boundaryis reached an alarmis generated device stays in alarm condition until relay is de energized ON OFF CONTROLMODE Either for mode 1 or 2 high or low conductivity dosage the user has to define the following values through setup e relaysetpoint uS mS ppm value oBOSING e relayhysteresis uS mS ppm value QD ine Connect your device to th
32. ng EEPRO M reseta blinking mes ee sage Set is shown on primaryLCD the secondary LCD displays MEM m Atthe end of this operation all the pa rameters are reset to their default i values The calibrated cell constant is also reset For this reason the CAL eet flag blinks until the EC TDS calibra tion is perfonmed Relays and LEDs selftests are executed as follows First all of the relays and LEDs are switched off then theyare switched on one ata time for a few seconds and cyclically User can interrupt the otherwise endless cycle pressing any key as indicated by the scrolling message Relays and LEDs test has to be carried out with the relay contacts disconnected from extemal plant devices 39 WATCHDOG When a dead loop condition is detected a reset is automati callyinvoked The effectiveness of watchdog capabilitycan be tested through one of the special setup itens This test consists of executing a dummy dead loop that causes watchdog reset signal to be generated EXTERNAL FUNCTIONS HOLD FUNCTION This function allows to performthe maintenance procedures When the relevant digital insulated HOLD input terminals 6 on page 7 ison the ana 2 log outputis frozen atits last value and control 0 and alarmrelays are disabled The HId indi cation is displayed on the secondaryLCD when the function is active A 5 to 24 VDC voltage can be applied to this input
33. ollers 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 sophisticated yet easy to use system resolves these predicaments on two fronts hardware and softwere To elimi nate problems of blackout and line failure the alarmfunction operates in a Normally Closed state and hence alarmis triggered if the wires are tripped or when the power is down This is an importantfeature since with most meters the alarm terminals close only when an abnonmal 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 alarmin abnormal circumstances for example if the dos ing tenvinals are closed for too long a period In both cases the red LED swill also provide a visual waming signal The Fail Safe mode is accomplished by connecting the exter nal alarm circuit between the FS C Normally O pen and the COM terminals This way an alarm will wam the user when EC exceeds the alarm thresholds during power down and in the case of a broken wire between the process meter and the extemal alarm circuit FS 0 O FSeC pe O a i In order to hawe the Fail Safe feature activated an exemal power supply has to be connected to the alarm device CONTROL THROUGH ANALOG OU
34. ond port to the current output B or voltage output depending on which Cb votoge ouput parameter is being used as depicted se wa aside The type voltage or current and the range of the output analog signal is selectable through the jumpers on the power board Configurations of the switch are as follows Qipt Switch 1 Snitch 2 Switch3 Switch4 OSV 15 0L OF ON os OIO N OF ee 5 O20nA 420nA EnS oN ore CO1lnA SS OF eared 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 defaultis 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 defaultthe minimum and max mum values of analog out putcomespond to the minimum and maximum of the selected range of the meter For example for the EC 700 with a se lected O to 1999 uS range and analog output of 4 20 mA the default values are O and 1999 US corresponding to 4 and 20 MA respectively These values can be changed by the user to have the analog 27 CALIBRATION output matching a different EC or TDS range for example 4 MA 30 mS and 20 nA 50 nv To change the default values the setup mode must be en tered Setup codes for changing t
35. outputs with leona Q1 p97 1 ANTES E7100y user selectable zoom li QOL amal E700 recorder outputs in a1ec mAmops and volts Acurecy O5 fUll sde BCa co Use the 3 wire Pt 100 27 dEeF OS Chavemn Oto 70 G 1 Gatside temperature sensor to compensate for the q J EC TDS PROBE WITH BUILT IN PT 100 TEMPERATURE SENSOR 7 TenpedtueCfide trav Q00to100074 C cable reS SANCE and wll have a precise auto zi d Biel BVODaidaim 2 fUl sale ECar oD matic temperature OS compensation of the IntadlaionGiegay M measurements in long E distance applications 33 Probe H 7639 ArirgBZIbSpcbe K 2 wthb iltin3 wrePT0D See the diagram for a S tanmeduressa sy ad 5 mtd idceiche recommended installa tion Acaloginat 4 2nA Power S pdy 20 1O 4Co 115 1O OH Power Cra nian 10 A Rdas lad2 Batmeteiel dayPUrantataipts 5A 2S50VAG 5S4 SOME resstivelaar AlamPReday Betmeteriacd RdayPUOrantataipt 5A DOVES 5A SOM ac resistivelcecy u NI 112 2 NZ GND c1 Process EC or TDS Controller KARR com e com e FSO o ALARM Fs c e com e CONTACT1 no e CONTACT2 nol e L N PE o o e Ewiromet O 50 G nax BARH mareg T E O Endosure srd
36. panel should be terminated with cable lugs 47 HANNA LITERATURE De Beier Woks Viera Be oak Lab Raodrg Vater Acelysis Herchodk Wala PP am Re S TW ONLY Od NI GALNIdd V e Tremnet Gred Gdg These and many others catalogs handbooks and leaflets are available from Hanna To receive your free copy contact your dealer or the nearest Hanna Customer Service C enter z oO m 4 wo CoS oO mw A E HANNA instruments http www hannainst com
37. pat is being calibrated e Press and hold in sequence CFM first then gt and then CAL to enter the Analog O utput Calibration mode Execute the password procedure e The primary display will show the current selected param eter blinking Use the f to select the code 0 5 see chart below for the desired parameter displayed on the second ary display e g 4 20 mA e Press CFM to confirm the selected parameter that will stop blinking on the primary display The secondary display shows the HI 931002 or multimeter input value as lower limit of the interval a e Use the ft or J to make the HI 931002 or multimeter out put correspond with the meter s LA A value shown on the second ary display e g 4 e Waitfor approximately 30 seconds until the reading of the calibrator is stable e Press CFM to confirm The meter will switch to the second calibration point Repeat the above procedure e After the desired readings are obtained press CFM and the meter will skip back to normal operational mode When adjusting values using the ff or amp keys itis important to allow for sufficient response time up to 30 seconds The table below lists the values of output codes along with the calibration point values which are the analog output minimumand the analog output maximum as indicated on the display The secondary display indicates the current calibration point value while primary display indicates the curren
38. rt 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 Connecting an external device e g chart recorder to the controller the procedure is easier and doesn t need the use of hand plotting the process variable EC or TDS 23 ALARM RELAY 24 The alarm relay functions in the following manner F amp C NO Nomadilly Qos Begad Rday P O NC Nomaily dose Deegan Rday During alarm condition the relay is de energized When not in alarm condition the relay is energized Bample High alarmsetat 1400 u S Lowalarmsetat 600 uS Alam Relay De energize Alarm ay v Energized No Alarm 0 600 630 1370 1400 1999 S An hysteresis will eliminate the possibility of continuous se quences energizing de energizing of the alarm relay when the measured value is close to the alarm setpoint The alarm hysteresis amplitude is 1 5 of full scale Moreover the alarm signal is generated only after a user se lectable time period alarm mask has elapsed since the controlled value has overtaken one alam threshold This additional feature will avoid fake or temporary alarm condi tions If the power supply is interrupted the relay is de energized as if in alanmcondition to alert the operator In addition to the user selectable alarm relays all EC TDS contr
39. sed The temperature probe should also be connected to the pro cess meter The meters are equipped with a stability indicator The user is also guided with indications on the display during the calibration procedure Pour a small quantity of the calibration solution e g 1413 uS into a beaker If possible use a plastic beaker to minimize any EMC interference For accurate calibration use two beakers containing the same solution the first one for rinsing the probe the second one for calibration By doing this contamination between the so lutions is minimized To obtain accurate readings use the calibration solution in the selected range and closer to the values to be measured To perform the EC or TDS calibra tion enter the calibration mode by CAL pressing CALand entering the pass LF word e After the correct password is en tered the control actions stop and the primaryLCD will display the first EC or TDS calibration value with the CAL indicator blinking The sec ondaryLCD displays the temperature If the wrong password is entered the system reverts back to nomal operation displaying EC or TDS values e O isthe default value for the 1 calibration point Dry the conductivity probe and leave itin air e Only when the reading is stable the CAL indicator will stop flashing af ter about 30 seconds and the READY and CFM indicators will start blinking e PressCFM to confirmthe calibration point th
40. t calibration type aJPUT CALIBRATION CALIBRATION CALIBRATION TYPE QIE PONT1 PONT2 O1nA Oo Ona Ina O2nA 1 Ona 2nA 420nA 2 4nAa 2OnA O5 3 Oval 5M ESWC 4 ING 5 0L GIOVE 5 Ova IOV 35 LAST CALIBRATION DATA 36 The meter can displaythe following lastcalibration data e Date e Time e Cell constant While displaying these data the controller remainsin control mode The data are related to the selected range only The procedure below indicates the flow Displaying of the items follows the above sequence e To begin the cycle press CAL DATA The last calibration date will appear on the primary LCD as DD MM format while the secondary display will show the year CAL DATA If the meter has never been calibrated or an EEPRO M reset has occurred no calibration data are shown when CAL DATA is pressed The no CAL message will blink for a few seconds then the meter skips back to normal mode ea DATA e Press ft or to cycle through the data forward or backwards respectively In any monent by pressing LCD or CAL DATA the meter will retum to the regular operating display Press or gt to view the time of last mond calibration The secondary display will show HO U HLL e Press ft or gt again to view the cell constant at the time of last calibra Co tion The secondary display will show CEL e Press or gt again to retum to the first CAL DATA display date atthe time of last c
41. tor blinks onthe LCD Press SETUP before CFM to ext without changing the cell constant CALIBRATION BUFFER DIRECT SELECTION This feature allows to set a user defined calibration point in order to perform calibration ata point different fromthe memo rized standards e PressCAL to enter calibration mode The LCD will showO 31 e Press SETUP key e Using ft 2 and enter the desired buffer value and confinmby pressing CFM Press SETUP before CFM to exit without changes Note it is suggested to calibrate the offset before entering the cali bration buffer direct selection TEMPERATURE CALIBRATION 32 The controller is factory calibrated for temperature However the user may also performa one point temperature calibra tion This procedure is to calibrate the offset only the slope will remain as factory calibrated e Prepare a beaker containing a solution at a given tem perature inside the range of the meter e Usea Checktemp or a calibrated thermometer with a reso lution of 0 1 as a reference thermometer Immerse the temperature probe in the beaker as close to the Checktemp as possible e Press and hold first CFM and then om CAL to enter the temperature cali bration mode e Execute the password procedure e Select code 1 via the arrow keys for temperature calibra tion and confinmwith CFM e CAL will blink on the LCD The mea sured temperature will be displayed on both the primary and secondary
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