Forbes User manual
Contents
1. lt v Forbes Marshall Monec 8965 pH ORP TRANSMITTER User s Manual Monec 8965 pH ORP TRANSMITTER User s Manual This user manual corresponds to the Monec 8965 8965 Ex pH ORP transmitter Part Nos 8965L 8965L Ex 8965H 8965H Ex and is the July 2005 revision P C No C2013775 If you experience difficulty with the installation or operation of this equipment please contact our Customer Service representative Manufactured and Marketed by Forbes Polymetron Pvt Ltd A Forbes Marshall Company A 34 35 MIDC H Block Pimpri Pune 411 018 INDIA TEL 91 0 20 27442020 FAX 91 0 20 27442040 TLX 0146 323 FSON IN 10 04 Dear User Thank You for purchasing the Monec 8965 pH ORP transmitter To maximize your benefits from this product we request that you read this manual thoroughly before installing the system A record of the product s maintenance history should be kept in this manual s Field Service Record every time our service representative visits you What s Inside 1 About The Product General Description Specifications Operating Principle 2 Getting Started Included Items What You Need Mounting Electrical connections Commissioning the Product 3 Operation and Maintenance Front panel details Operating Modes Programming Do s and Don ts 4 Fixing Problems Troubleshooting Current output calibration Spares Service Field Service Report 20 36 1 About The Product 1 1 General Des2. product is returned to our Works you should include either the original excise gate pass or our invoice number and date If you d prefer an estimate before proceeding with repair You should clarify on the form whether you would like to have the cost estimate before we make any necessary repairs If you indicate that an estimate is required our Works Engineer will complete Part 6 of the form and return it to you If this estimate is satisfactory you should approve the estimate and return the approved form to your Forbes Marshall representative Only then will servicing proceed 40 Forbes Marshall Division Customer Name Contact Person Phone Reference Product Description Serial Number Original Invoice Date Input Inlet Details Output Outlet Details The Productis O On line O Off line Connections O Flanged O Screwed L1 Welded Mounting Details Process Media Pressure Temperature Sensor Details If any Mounting Details 4 Observed Problems or Symptoms 5 Proposed Action ORepair at Site O Return to Works O Estimate First Or Under Warranty Field Engineer s Sign Customer s Signature 6 To be Filled in for Estimate Purpose Estimated Cost List any imported spares which must be provided by Customer Signature of MFG CSD Engineer 7 Customer s Endorsement We accept the above repair estimate Signature amp Stamp 42 5 Notes Notes Notes BRANC
3. symbol CAL appears followed by the display of the measured pH At the same time a flashing arrow indicates that the instrumentis in the programming mode 10 05 29 Now immerse electrodes into a buffer solution Wait for the pH reading to stabilize Using the rollkeys adjust the display until the indicated pH corresponds to the pH of the buffer solution Do not press select at this stage as the instrument will advance to next step of program without any calibration Press enter The symbol El appears temporarily followed by display of corrected pH value There are now two options 1 Single point calibration any one buffer Confirm with Select to fix the adjusted pH value During the course of this calibration the instrument determines that a The deviation of the zero is within the factory set limit of 2 pH units for glass electrodes or 5 pH units for antimony electrodes In this case the actual zero is calculated and the calibration is accepted The instrument automatically advances to the next step of the program if at this point you prefer to return directly to routine measurements measurement mode simply press Enter b The deviation of the zero is in excess of the factory set limits In this case a correction is not possible the symbol Er1 appears in the display For routine measurements the instrument will use the theoretical zero O mV Since the risk of substantial errors is very real itis better to repe
4. 100 mA linear Protection ib Ux30V icc lt 25mA nonlinear At 30 V permissible load is 725 Q as shown by the following equation U 15 5 R load in Q 0 02 U Supply voltage in V Enclosure Epoxy coated cast aluminum Protection IP65 as per DN 40050 Nema4 for wall mounting Dimensions 165Hx165Wx93D mm 200Hx165Wx93D mm with installed cable gland 2 Nos 1 2 NPT material SS 1 3 Operating Principle The two wire transmitters are charecterised by only two leads serving both as a source of power supply and a means for analog signal transmission The analog signal is in the form ofa 4 20 mADC current The entire hardware is structured as functional modules assembled together The DC power supply is converted in split supplies required to drive the processing circuit through a Power pack assembly which is potted for environmental protection and a long sustained life The potential of the electrodes which represents the process parameter is processed by a high impedance amplifier The amplifier is situated either inside the transmitter thereby offering high input impedance or can be a separated external module which gives output at low impedance The selection of version is dependent upon the distance required between the electrode and the transmitter If the distance between transmitter amp electrode is less than the length of electrode cable the integral buffer version is suitable The length of the electrode cable varies
5. 250 250 7 12 0 500 7 9 9 14 250 750 8 10 500 500 1000 750 1250 3 3 1 6 Temperature compensation In the display appears the symbol Aut or MAn for automatic temperature compensation with Pt100 or manual temperature compensation with a fixed reference temperature Temperature Adjustment with Automatic Temperature Compensation By simultaneously pressing Select and Enter the symbol t IC appears followed by the display of the measured temperature This value can now be adjusted to a nominal value with the roilkeys Temperature Adjustment with Manual Temperature Compensation Confirm the adjustment with Select or Enter 34 3 4 DO S and DON TS e Don t ever try to adjust the potentiometers on CPU board e Don t leave the pH electrode dry e Don t expose the screw cap connector on the sensor to moisture e Don t press the keys too hard while programming e Do ensure that the transmitter and buffer are mounted firmly on panel or pipe as application demands e Do use the same electrolyte as mentioned on the electrode while refilling e Do use the proper tools while removing making electrical connections 35 4 Fixing Problems 4 1 Troubleshooting The MONEC transmitters being microprocessor based offer self diagnostic and error reporting feature This feature enables the user to identify the possible cause of the problem and decide the remedy for the same The error messages and their meaning ar
6. HES ACROSS INDIA AHMEDABAD 4 Shetoor Bunglows Opp Drive In Petrol Pump Near Chandandwar Hospital TV Tower Anmedabad 380 054 Tel 079 26851738 26856374 Direct 079 26859395 Fax 079 26854014 Email ahmedabad forbesmarshall com ALIBAG Pent House No 1 Bafna Baug Complex B Behind Big Splash Hotel Chendhare Alibag 404 201 Tel 02141 223795 0 Fax 02141 223796 0 Email fmalibag pn3 vsnl net in BANGALORE 21 Coles Road Cleveland Town Bangalore 560 005 Tel 080 25483047 25485626 25484281 Fax 080 25499971 Email forbesGbgl vsnl net in CHANDIGARH SCO 77 Top Floor Sector 38 C Chandigarh Tel 0172 5080285 Fax 0172 695098 Email forbes eth net CHENNAI Plot 59 Montieth Rd Asha Mansion Egmore Chennai 600 008 Tel 044 28554493 28553011 Fax 044 2855380 Email chennai eth net COIMBATORE Flat No 4C Classic Garden Apts 1552 19 Trichy Rd Coimbatore 641 018 Tel 0422 2303679 22306015 Fax 0422 2300072 Email forbescb md3 vsnl net in DELHI Steam Engineering Group 24 Laxmi Insurance Bldg Asaf Ali Rd New Delhi 110 002 Tel 011 23232947 23232756 Fax 011 23233762 Email delhiseg dishnetdsl net MANUFACTURING UNITS PUNE KASARWADI PB 29 Mumbai Pune Road Kasarwadi Pune 411 034 Tel 020 27145754 DID 020 27149012 Fax 020 27147379 HYDERABAD Plot No A 19 2 amp T 4 2 Tel 040 27151664 PUNE MIDC A 34 35 MIDC H Block Pimpri
7. L bolts 4 nos Used teat bracket Ill M6 spring washers With tr nstnitier 4 nos IV M6 hex nuts 4 nos V U clamps 2 nos VI M8 hex nuts integral with 4 nos each other VII BSW washers 4 nos 2 2 What You Need 1 oo UE o 3 digit multimeter pH RTD calibrator Screw driver blade width 6 mm Instrument screw driver blade width 3 mm Spanner for M6 nuts Spanner for M8 nuts Spanner for 25A F for cable glands 2 3 Mounting The transmitter can be mounted either on wall or on a 2 NB pipe 2 3 1 Wall mounting The casting has 4 holes in four corners as shown in FIG 2 1 The transmitter can be installed in sequence as follows Since unit has factory fitted wall mounting bracket it needs to removed for mounting on external wall Drill 7 MM through holes in the suitable plate on which the transmitter is to be mounted Hold the unit flat on the mounting plate and insert M6 x 20 L bolts through the four corner holes Fix 4 nos of M6 spring washers and nuts from the rear end of the mounting plate Hold the nuts and tighten the bolts with the help of suitable spanner This completes mounting the transmitter in place 165 mm F 150 mm 150 mm 165 mm 35 50 mm 1 2 NPT SS Ly CABLE GLAND FIG 2 1 Wall mounting of Transmitter 2 3 2 Pipe mounting The 2 NB pipe mounting kit is supplied along with the Transmitter unit which coul
8. Pune 411 018 Tel 020 27442020 Fax 020 27442040 Email pune forbesmarshall com spirax http www forbesmarshall com spirax http www forbesmarshall com spirax 1 D A Nacharam Hyderabad 500 076 Tel 040 27152276 27170732 27171909 27153918 Fax 040 27173235 27179223 27152193 Email saleshyd satyam net in saleshyd sancharnet in DELHI Control Instrumentation Group Anupama Arcade 2 Floor Opp Samachar Apts Mayur Vihar Extn Phase 1 New Delhi 110 091 Tel 011 22713485 22712902 3 Fax 011 22710484 Email forbes nda vsni net in fmdelcig sify com HYDERABAD Plot No A 19 2 amp T 4 2 1 D A Nacharam Hyderabad 500 076 Tel 040 27152276 27170732 27171909 27153918 Tel 040 27151664 Fax 040 27173235 27179223 27152193 Email saleshyd satyam net in saleshyd sancharnet in JAMSHEDPUR 59 Rajendra Nagar Jamshedpur 831 001 Jharkhand Tel 0657 2437721 Telefax 0657 2427983 Email jsr fmjsresancharnet in KOLKATTA 5A Orient Row Kolkatta 700 017 Tel 033 22407359 22835807 22835809 Fax 033 22475280 Email fmcal cal vsnl net in MUMBAI 107 Mahatma Gandhi Road Mumbai 400 023 Tel No 022 2267 3821 2267 3822 Fax 022 22672970 Email mumbai forbesmarshall com NAGPUR 50 ASHA 2nd Floor Lendra Park New Ramdaspeth Nagpur 440 010 Tel 0712 2539386 Telefax 0712 2549851 Email nagpur forbesmarshall com NAVI MUMBAI Ellora Sector 14 P
9. at the calibration with new electrodes and or fresh buffer solution 30 2 2 point calibrations with any of two buffers Choose buffers whose nominal pH values are substantially different The pH value of the second buffer solution can be either greater or less than the pH value of the first Immerse the electrodes into the second buffer solution Using the rollkeys adjust the pH until it corresponds to the pH of the Confirm by pressing Enter Now the symbol E2 appears temporarily followed by the corrected pH Press Select to display the asymmetry potential and the slope During the course of this calibration the instrument determines that a The deviation of the slope is within the factory set limit of 70 110 for glass electrodes or 70 120 for antimony electrodes In this case the actual slope is calculated and the calibration is complete Press Enter to return to routine measurements measurement mode b The deviation of the slope is in excess of the factory set limits In this case a correction of the slope is not possible the symbol Er2 appears in the display Since the risk of substantial errors is very real it is better to repeat the calibration with new electrodes and or fresh buffer solution ORP electrodes are not calibrated The transmitter functions as a milli voltmeter indicating absolute mV values Buffer Solutions The pH of buffer solutions is dependent upon the temperature e g the nominal pH values ar
10. cription The Monec 8965 pH ORP transmitter is a Microprocessor operated field mounting instrument to monitor the pH or Redox potential of process solution and transmit 4 20 mA current as a retransmission output The analyser is designed with modular hardware and user friendly software support The 8965 range of transmitters are designed to suit intrinsic and non intrinsic applications In all there are 4 versions of transmitter units in this range 8965L Non intrinsic version with external buffer amplifier 8965L Ex Intrinsic version with external buffer amplifier 8965 H Non intrinsic version with integral buffer amplifier 8965H Ex Intrinsic version with integral buffer amplifier The Intrinsic versions are marked as Ex which correspond to the ignition safety classification Intrinsic safety in accordance with IS standard 5780 E Ex ia IIC T5 All these models are compatible to probes equipped with glass antimony or ORP electrodes Since the transmitters are Microprocessor operated all the application specific parameters are field programmable such as type of electrode measuring range type of temperature compensation calibration mode etc The unit offers high reliability and easy serviceability due to modular hardware structure reducing maintenance lead time The software calibration facility allows operation of the instrument without opening the instrument 1 2 Specifications Glass ORP or antimony electrodes Pt 100 temp
11. d be used to mountthe transmitter on a 2 NB pipe The dimensional details of pipe mounting arrangements are as shown in FIG 2 2 The sequence of mounting is as follows l Hold the transmitter and the mounting bracket firmly on a pipe and insert 2 nos of U clamps through the mounting bracket ll Fixthe mounting bracket firmly on the pipe using 5 16 washers and M8 nuts Ill Ensure that the transmitter and the mounting bracket are held properly on the pipe This completes pipe mounting of the transmitter FIG 2 2 B Vertical pipe mounting of transmitter TOP VIEW 1 MONEC transmitter 2 M6x20Boltstofixtransmitterto mounting bracket 3 M8hexnuts and 5 16 washers to fix U clamps to mounting bracket 4 Mounting bracket 5 Standard2 NB pipe 6 M6 hex nuts and M6 spring washers to fix transmitter to mounting bracket 7 U clamps to hold transmitter on mounting bracket to standard 2 NB pipe 9 2 3 3 Mounting of external buffer amplifier With models 8965 Land 8965 L Ex a separate buffer amplifier module is required The external buffer amplifier is housed in a wall mounting type casting with two holes of 4mm dia at diagonally opposite corners which can be seen after opening the lid on the module The buffer case should be mounted on a plain surface with the help of 2 nos of M4 x 15 CH HD screws spring washers and hex nuts FIG 4 shows the locations of these mounting holes Mounting Holes Mounti
12. de From pH amp Temp Sensor FIG 9 External Buffer Amplifier connections Also open the transmitter by unscrewing 2 Nos of knurled screws on transmitter Shown in fig 10 is part view of PCB which is seen on opening 15 FIG 10 Electrical Connections for 8965L 8965L Ex External buffer amplifier version 2 4 2 1 Sensor connection Refer Fig 9 Connect measuring electrode wire of pH sensor to IN terminal The IN terminal is made of Teflon base with a screw terminal at top where the wire is to be connected Connected the reference electrode wire of pH sensor amp the Pt100 sensor leads at the respective terminals as indicated 16 2 4 2 2 Inter connection between external buffer amp transmitter This is done by means of 6 core cable and the connections should be made as per wiring shown in Fig 11 8965 L L Ex External buffer amplifier FIG 11 Interconnection diag between External buffer amp 8965L L Ex 17 2 4 2 3 Power supply connection From terminals 8 9 10 of 8965 L L Ex wires are routed internal to transmitter to a 3 way terminal block as in fig 12 8965L L EX Terminals z Terminal Block On Case Casting FIG 12 Power Supply Connection for 8965L L Ex Connect transmitter power supply wires at the terminal block Being a 2 wire transmitter the current o p is available through these same wires 18 2 5 Commis
13. depending on the type of electrode or the cable that has been specified in the order It is typically 3 mtrs 5 mtrs amp 10 mtrs Ifthe distance ofthe transmitter from the electrode is greater than the cable length then the external buffer version is required A special Analog to Digital converter digitises the analog voltage suppressing noise signals thereby providing for more accurate pH and temperature measurements The digital data is further processed by a dedicated microprocessor to perform auxiliary functions as display retransmission output generation calibration enabling programming and co relating programmed data to actual processing The results are displayed on a 3 1 2 digit LCD display The application specific parameters such as measuring range calibration mode and type of temperature compensation are field programmable The block diagram shown in FIG gives a clear picture of data routing and different functional blocks interconnected OPTO Coupler Optical Optical Transmitter Receiver Galvanic Isolation a Temperature Input pH mV Signal Input Fig 1 Block Diagram 2 Getting Started 2 1 Included Items When you unpack the carton use the following checklist to make sure that all of these critical components are present 1 2 3 Transmitter 1 no Instruction Manual 1 copy 2 NB Pipe mounting kit consisting of l Pipe mounting bracket integral with transmitter 1 no I M6 x 20
14. e as listed below ERROR FAULT NATURE ACTION MESSAGE Incorrect Check the parameters programming programmed and correct wrong entry Asymmetry Recalibrate electrode potential exceeding I If error still occurs after this factory set limits clean the electrode amp again recalibrate 3 If error still appears replace electrode amp calibrate again Slope potential 1 Recalibrate electrode exceeding factory 2 If error still occurs after this set tolerance clean the electrode amp again recalibrate 3 If error still appears replace electrode amp calibrate again Pt 100 leads Check the resistance between shorted Pt 100 leads and rectify or replace the sensor Pt 100 leads are Check the resistance between broken or Pt 100 leads and rectify or disconnected replace the sensor 36 4 2 Current Output Calibration The current output is factory calibrated and does not require to be adjusted again Hence carry out this operation only if you find that the current output is outside the specified accuracy limits Switch OFF the instrument Press roll keys increment amp decrement keys simultaneously and switch ON the instrument Release the keys when message lout appears on display This message is followed by display 4 represents setting of 1 4 mA and is immediately followed by a display of coefficient Measure current output on current meter The meter isto be connected in series with power supply amp tran
15. e referred to a temperature of 20 Deg C For temperatures other than 20 Deg C the calibration with the buffer solution must be done at the sample temperature 31 3 3 1 3 Displaying the parameters This program step displays the deviations of the asymmetry potential and the slope from their respective nominals The symbol PAr appears and the actual deviations for the zero and the slope are displayed alternately The signs or indicate either a positive or a negative deviation of the asymmetry potential The slope deviation is expressed with respect to the theoretical slope of 59 2 mV pH at 25 Deg C In the display mode these parameters appear immediately after the display of the electrode type 3 3 1 4 Selecting span of measurement Depending upon the type of electrode the following ranges are available a Glass electrode 2 5 10 14pH b Antimony electrode 5 10 14 pH c ORPelectrode 500 1000 2000mV Select and confirm with Select Whatever the selection the measuring range always refers to the range appearing at the analog output 32 3 31 5 Selecting working range The symbols InF and SuP indicate alternately the lower and upper ends of the range Measuring Ranges ApH ApH ApH ApH A500 A1000 2 5 10 14 mV mV 0 2 0 5 0 10 0 14 1500 1500 1000 500 1 3 2 7 2 12 1250 1000 750 0 2 4 3 8 4 14 1000 500 500 500 3 5 4 9 750 0 250 1000 4 6 5 10 500 500 0 1500 5 7 6 11
16. er 21 3 3 Programming The programming is done with that 4 keys on the front facia Various fonts displayed during the programming are shown in the following table to help understand the mode and parameter to be programmed Operating mode display Operating mode programming Standard glass electrode Antimony electrode ORP electrode Redox electrode Calibrate the pH electrodes Calibration solution 1 Calibration solution 2 Display the calibration parameters asymmetry in pH units slope in measurement with Pt 100 Note Please note that pressing of Select key alone will enable Display mode wherein alternation of any parameter is not allowed In order to invoke Programming mode both Select and Enter keys need to be pressed simultaneously The sequence of programming is illustrated in the flowchart in FIG 7 22 Press SELECT and ENTER keys simultanously Displays MES EN Return to measurement mode z 5 Values shown in this Displays CAL flowchart are indicative only Set value of calibration solution 1 Flashing Arrow Indicates that calibration adjustment is possible No Without calibration No Yes Displays E1 9 Displays E2 ET No Yes Two Point Caliberation yo Displays MES Displays PAr lt _ Displays the asymmetry amp slope parameters alternately Asymmet
17. erature sensor Measuring Parameter Glass Antimony range pH pH mV Span 2 5 10 14 5 10 14 500 1000 2000 Lower end 0 12 0 9 1500 1000 Upper end 2 14 5 14 1000 1500 Supply power supply with 30V 100 mA max Temp Automatic 0 130 C with Pt 100 Comp Manual 0 130 C in steps of 1 C Measuring lt 2 seconds Cycle t90 Reproducibility 0 1 FSD O P Signal 4 20 mA load 725 Q at 30V D C galvanically isolated 425 Q at 24V D C Mes error Output signal 0 1 mA pH measurement 0 2 FSD ORP measurement 3mV FSD Calibration Computer assisted 1 or 2 point calibration e Any of two cal solutions within 0 14 pH for the Zero and slope e Any 1 calibration solution within 0 14 pH for the Zero asymmetry potential Zero adj 2 pH for glass electrodes asymmetry 5 pH for antimony electrodoes potential Slope adj 70 110 of the theoretical slope for glass electrodes 70 120 of the theoretical slope for antimony electrodes Storage of Last measurement is retained during calibration and measured programming values 3 1 2 digit LCD 18 mm height Data I P Sealed touch keyboard with 4 keys Electrical connections Model 8965 H Power supply 15 5 V lt U lt 32V Current 20 mA min Model 8965 H Ex In order to meet the specifications for intrinsic safety the auxiliary power must be supplied by a certified intrinsically safe power supply Protection ia or ib Ux30 V icc lt
18. lot No 45 Opp Marathe Bhavan Vashi Navi Mumbai 400 705 Tel 022 27666157 27655969 Fax 022 27881533 Email fmvashi vsnl com PUNE PB 29 Mumbai Pune Road Kasarwadi Pune 411 034 Tel 020 27145754 Fax 020 27147379 Email pune forbesmarshall com SURAT 7B Ground Floor Navchetan Society Opp Krushimangal Hall Ring Rd Surat 395 007 Telefax 0261 2651448 2650896 Email surat forbesmarshall com VADODARA 10 Shreeji Krupa Society Gotri Rd B H Kalpavruksha Complex Subhanpura P O Vadodara 390 023 Tel 0265 2343733 Direct 0265 2342234 Fax 0265 2337930 Email baroda forbesmarshall com VISAKHAPATNAM 403 Crescent Towers Opp Enadu Seethammadhara Visakhapatnam 530 013 Tel 0891 2552538 Fax 0891 2535576 Email vizag forbesmarshall com REPRESENTATIVES BHOPAL MIG 24 2A Saket Nagar Bhopal Tel 0755 2582710 Cellular 098261 62047 Indore 36 A Narmala Nagar Annapurna Rd Indore 452 009 M P Tel 0731 5058030 Cellular 0731 3102220 098260 17398 MADURAI 55 LIG Colony K K Nagar Madurai 625020 PONDICHERRY dakshin_tds yahoo com
19. ng Holes FIG 4 Mounting of external buffer amplifier 10 2 4 Electrical connections All the cables should be routed through the cable glands and rubber seals of the glands before the wires are terminated on the connectors Care should be taken to avoid mechanical damage while stripping the cables The cable for pH sensors consists of a screw cap socket at one end Thread this onto the threads on pH electrode The other end contains the wires to be connected at the transmitter end The fig 5 shows this end to identify the proper wires Conducting Layer BLACK Shield Ref Electrode Conductor Glass Electrode FIG 5 Electrode Cable Transmitter Connection End As seen in figure the cable has a conductive layer between shield and the insulation This layer needs to be peeled off such that there is sufficient distance between the glass wire and the layer In case of pH sensor Polymetron make type 8350 the temperature sensor is inbuilt This electrode has an integral cable containing the lead wires of pH sensor and Pt100 temperature sensor The sensor with its integral cable is shown in Fig6 11 Glass Core of inner cable Ref Shield of inner cable Pt100 2 wires FIG 6 Polymetron make 8350 electrode 2 4 1 Electrical connections for 8965H amp 8965 H Ex Once the instrument is suitably mounted open the transmitter by unscrewing 2 Nos of knurled captive screws on the
20. ry Slope 25 Displays ECH Displays Inf first and then SuP Select lower amp upper ends of measurement Yes Yes em Displays MES Return to measurement mode Yes No Continued gt 26 Displays t C Select mode of temp measurement and compensation Yes Que Return to electrode selection at Displays MES Return tc measurement mode Continued F Manual Press Select and Enter keys simultaneously to update temperature in Auto mode Set the temperature lt Set the temperature g o o D lt o m m Return to measurement mode Yes Yes No No Return to electrode selection at 28 3 3 1 Programming step The programming mode is accessed by simultaneously pressing Select and Enter The symbol Pr appears 3 3 1 1 Selecting type of electrode Using the rolikeys choose any one of 3 electrode types e Glass electrode e Antimony electrode e ORP electrode Pressing Select confirms the choice and moves the program to the next step 3 3 1 2 Calibrating for the electrodes Calibration entails the comparison and adjustment of the measured pH with that of a known buffer solution or a process solution of an accurately known pH Either one or two calibration solutions may be used Atthe start of the calibration mode the
21. sioning the Product e Ensure thatthe transmitter is mounted firmly on a panel or a pipe as required e Check all the connections of sensor and signal terminals e Tighten the nuts of the cable glands so that the cables are firmly gripped by the rubber seal This is necessary to preventingress of dust amp moisture e Connect the buffer terminations properly to the transmitter in case of external buffer versions e Ensure that the external buffer is mounted firmly e Calibrate the electrode to be used in process For this operation read the section 3 of this manual thoroughly Follow instructions given in the procedure calibration of electrodes of the same section e Mountthe sensor carefully in the process pipe or tank as per the application e Connect power to the transmitter and check the performance 19 3 Operation and Maintenance polymetron Intrinsically safe version Non Intrinsic version FIG 13 Front Panel Fig 13 shows the front facia for the transmitters The Ex symbol indicates that the instrument has intrinsically safe electronics The display is 3 1 2 digit LCD module The four nos of keys can be grouped as 1 The Rollkeys M Increase the value Decrease the value In programming mode upon first pressing the rollkeys the selected values change slowly in steps After approximately 10 steps the rate of change accelerates and the desired setting is quickly reached 20 2 The Select ke
22. smitter Press increment or decrement key to increase or decrease the current output so as to get 4 mA reading on the meter Press select key Message 20 is displayed and is followed by display of another coefficient Press increment or decrement key to get 20 mAreading on meter Press select key NOTE i Reprogram the instrument in the desired configuration as all previous settings are altered by the above operation ii Recalibrate for the sensor as the previous sensor calibration is also disturbed 37 4 3 Spares C2013723 Power supply board assembly 8965 H C2013785 External Buffer PCB assembly applicable in 8965 L L Ex models only C2018807 Cable gland assembly C2013775 Instruction manual 38 4 4 Service If you still need help please contact your nearest Forbes Marshall representative The addresses and contact numbers of our major branches are listed on the back of this manual They ll be happy to direct you to any representative in your area or provide service themselves Please record all instances of field service problems and actions taken in the space below Product Serial Number Date Problem Action Taken Serviced by 39 4 5 Field Service Report This form should be used to report field problems A copy should be filled out by your Forbes Marshall customer service engineer Any servicing which requires the product to be sent back to Works cannot be completed without this report If the
23. transmitter Shown below in fig 7 is a part view of the PCB which you will observe an opening Bo2 Bo1 FIG 7 Electrical connections for 8965H 8965H Ex Integral buffer amplifier versions 12 2 4 1 1 Sensor Connections Connect the measuring electrode also called as glass electrode wire of the pH sensor to the Bo3 terminal The BO3 terminal is made of Teflon base with screw terminal at top where the wire is to be connected While connecting guide the pH sensor cable through the cable holder and clamp it by the cable holder nut Ensure that the measuring electrode wire is not shorted to this clamp Connect the remaining wire as given below Reference electrode wire of pH sensor Pt 100 one end 4 Pt 100 Other end 13 2 4 1 2 Power supply connections From the terminals 6 7 amp 8 wires have been routed internal to the transmitter to a 3 way terminal block as shown in fig 8 Terminal Block On Case Casting FIG 8 Power Supply Connections for 8965H H Ex Connectthe transmitter power supply wires at the terminal block Being a 2 wire transmitter the current o p is available through these same terminals 14 2 4 2 Electrical connections for 8965L L Ex In these models an external buffer amplifier is provided Open the lid of buffer amplifier Shown in fig 9 is the view observed on opening cover Towards 8965L L E Terminal for glass electrode Measuring electro
24. y Pressing Select while in the measurement mode transfers the program into the display mode Once in this mode various parameters can be retrieved and read but no changes are possible Simultaneous pressing of Select and Enter keys activates the programming mode In this mode desired parameters can be chosen with Select key The whole program can be scrolled by pressing Select key continuously 3 The Enter key This key returns the program into measurement mode after storing the programmed settings If Enter is pressed during calibration the latest measurement data is displayed 3 2 Operating modes The instrument offers 3 different operating modes Programming mode This mode can be enabled by pressing Select and Enter keys simultaneously The prompt Pr indicates that programming mode is invoked Display mode By pressing Select key alone enables entry in display mode In this mode all the operating parameters can be read only and no alterations are possible in any operating parameter Measurement mode In this mode the instrument carries out routine measurements according to operating parameters programmed In orderto enter programming mode at any point of time Select and Enter keys need to be pressed simultaneously Note Whenever programming is aborted to enter measurement mode a prompt MES appears on the display for some time before displaying measured paramet
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