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Manual gnl Manual gnl Document Transcript

  • USER MANUALGENERAL SERIESTEMPERATURE CONTROLLER
  • Safty InstructionsThese instrument are meant for temperature control applications. It is advisesable to read the user manual beforeinstallation of the unit. All safety related instructions in this manual should be strictly observed to ensure the safety ofoperating personnel as well as the instrument.The instrument must be configured correctly for intended operation. Incorrect configuration may damage theinstrument or the process under control or it may lead to personnel injury.WarningDangerous voltages are present in this instrument. Before installation or begining of any trouble-shooting procedurethe power to the instrument must be switched off. Instrument suspected of being faulty must be disconnected &removed to a properly equipped workshop for testing & repair.To minimize the possibility of hazards like fire or shock,dont expose this instrument to excessive humidity or water.Avoid using this instrument in areas subject to hazardous conditions like excessive vibration,dirt,excessive humiditycorrosive gases & oils etc. The average ambient conditions should not exceed the maximum ratings specified inTechnical Details section..UnpackingUpon receipt of the shipment remove the instrument from the carton & check for the instrument,mounting clamps,Usermannual. Inspect the instrument for shipping damages.In case of damage report it to your nearest dealer & shippingagency for the claim.Write down the model no. Serial no. for future referance when corrosponding with our servicedepartment.InstallationThe controller in its installed state in panel must not come in close proximity to any corrosive or combustible gases,caustic vapors, oil, steam or any other process by-product.The controller in its installed state should not be exposed to carbon dust, salty air, direct sunlight or radiant heat leadingto ambient temperature more than 55 0 C.Ambient temperature and relative humidity surrounding the controller should not be exceed the limits specified.The controller in its installed state must be protected against excessive electrostatic and electromagnetic interferencesMountingThe instrument has been designed for panel mounting to afford ease in installation & inspection.a) Cut the panel according to the illustration as shown. Then insert a series EAP control unit through the cutout into thepanel ( the panel mounting template shown, will assist panel cutting.)b) Securely tighten the screws of the mounting clamp with a screw driver. Do not fully tighten one screw but do italternatly till the controller front panel is fitted snugly in the cutout.Control unit is now mounted on panel. Front view Side view Fig. No. 1 Panel wall Cutout Instrument
  • Wiringa) Before wiring, verify the lable for correct model no. & options. Switch off the power while checking.b) Care must be taken to ensure that maximum voltage ratings specified in Technical deatails section are notexceeded.c) It is always recomonded that the power to the instrument be protected by fuses or circuit braker rated at theminimum value possible.d) The instrument must be installed inside a suitably grounded metal enclosure to prevent the live parts being accesibleto human hands & metal tools.e) All wiring must conform to appropriate standards & regulations. Wiring must be suitable for voltage, current &temperature ratings of the system.f) Crimped terminal lugs are recomonded for power & sensor connections.g)Take care not to over tighten the terminal screws.h) Unused terminals should not be used as jumper points as they may be internally connected causing damage to theinstrument.i) Verify that the ratings of the output relays & outputs are not exceeded.j) Electric power in indusrial environments contains a certain amount of noise in the form of transient voltages & spikes.The electrical noise can enter & adversaly affect the operation of the instrument to some certain extent. For thisreason it is recomonded that the use of shielded thermocouple extension wire which connects from the sensor to thecontroller.Power Supply WiringThese controllerare supplied to operate at 90 - 270 VAC. Check that installation voltage corresponds with thepower rating.Local requirements regarding electrical installation should be rigidly observed. Consideration should be given toprevent from unauthorised person access to the power terminals Model 72 Model 1/4 DIN Model 1/8 DIN- Horozontal Model 1/8 DIN- Vertical 9 1 10 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 7 8 2 ordering information 230 VAC or as per L N N L N L 11 3 7 8 9 10 11 12 7 8 9 10 11 12 9 10 11 12 13 14 15 16 12 4 13 Power ON 5 switch 14 Fuse 230 VAC or as per 6 Fuse ordering information Fuse Fuse 15 N 7 Power ON Power ON 230 VAC or as per switch Power ON switch ordering information 230 VAC or as per 16 ordering information switch L 8Input WiringThermocouple and RTD wiringFor thermocouple input connections the correct type of thermocouple lead wire extension or proper compensatingcable must be used for entire distance between the thermocouple and the instrument, ensuring that the correctpolarity is observed throughout. Joints in cable must be avoided. If the length of thermocouple plus extension wireis too long it may affect the measurement value. A 100 ohms lead resistance induce an error of about 2 0 C.For RTD connections the single end leg wire(generally RED) is connected to terminal no. 1 while other two endsare connected to terminals 2 & 3 respectivly. The three wire leg offers the capability of lead resistancecompensation provided that three leads should be of same length and gauge. For two wire RTD terminals 2 and 3must be shorted. Model 72 Model 1/4 DIN Model 1/8 DIN- Horozontal Model 1/8 DIN- Vertical Pt-100 Pt-100 Pt-100 9 1 Compensating T/C Pt-100 element 10 2 T/C T/C T/C 11 3 Compensating 12 4 element 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 7 8 13 5 9 10 11 12 13 14 15 16 7 8 9 10 11 12 7 8 9 10 11 12 14 6 15 7 16 8
  • Linear DC Input WiringConnections for linear DC voltage or current input are shown as below. Polarity must be observed as indicated. Aresistance of 3 ohms is to be connected for current input. Model 72 Model 1/4 DIN Model 1/8 DIN- Horozontal Model 1/8 DIN- Vertical -0/4 ~20 mA -0/4 ~20 mA -0/4 ~20 mA + + + + 9 1 3 ohms res. 3 ohms res. 3 ohms res. 10 2 -0/4 ~20 mA 0-50 mV 0-50 mV 0-50 mV 3 ohms res. 0-50 mV 11 3 12 4 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 7 8 13 5 9 10 11 12 13 14 15 16 14 6 7 8 9 10 11 12 7 8 9 10 11 12 15 7 16 8Output WiringConnections for output are as below. The rated relay is for 5 Amp @ 230 VAC. The load must be resistive forrated output. If load is inductive the current ratings must be less than 60% of rated output. Snubber attacment isrecomended for inductive load. Model 72 Model 1/4 DIN Model 1/8 DIN- Horozontal Model 1/8 DIN- Vertical Load 5 Amp Max. NO1 P1 NC1 NO2 P2 NC2 N NO1 9 1 Resistive Each Each Load 10 11 12 13 14 15 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 7 8 2 NO1 P1 NC1 NO2 P2 NC2 N L L N NO1 P1 NO2 P2 NO1 P1 NO2 P2 N L 3 9 10 11 12 13 14 15 16 7 8 9 10 11 12 7 8 9 10 11 12 4 Resistive Load 5 Resistive Resistive Resistive Resistive Resistive Resistive Load Load Load Load Load Load 6 7 Load 5 Amp Max. Load 5 Amp Max. Load 5 Amp Max. Each 16 Each L 8 Each RS-232 or Data Logging Output Wiring With this output these instruments can be connected to PC, only one instrument at a time. A conventional 9 pin RS-232 cable can be used with some modifications as shown. Model 72 Model 1/4 DIN Model 1/8 DIN- Horozontal Model 1/8 DIN- Vertical Com Port Com Port Com Port RS-232c RS-232c RS-232c 9 1 or Rs485 or Rs485 or Rs485 10 2 GND Tx Rx GND Tx Rx GND Tx Rx 11 3 12 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 7 8 4 13 5 9 10 11 12 13 14 15 16 7 8 9 10 11 12 7 8 9 10 11 12 GND Tx 14 6 Com Port or Rs485 RS-232c 15 7 Rx 16 8 Female DB-9 1. DCD 1 2. RD 6 Rx 2 3. TD 7 4. DTR Tx 3 8 5. GND 4 6. DSR 9 GND 5 7. RTS 8. CTS 9. RI
  • Programming Set-Point1Key 4 Digit 8 Digit Descriptionsequence Display Display When MENU key is pressed for about 3 seconds SET level is entered and display is as shown. Press the DECREMENT key. The lower display shows flashing prompt while upper display shows its corresponding value. Press the DECREMENT key. The lower display shows steady prompt while upper display shows its corresponding value with a flashing digit. The value can be incremented or decremented by proper keys. The flashing digit is shifted to rotating left with SHIFT key. When MENU key is pressed value is entered and by pressing it twice comes to default mode.Programming Set-Point2 The lower display shows flashing prompt and upper display shows its corresponding value as shown. For 4 digit model display shows flashing prompt. Press the Shift key. For 4 digit model display shows flashing prompt. The next set-point will be displayed. The lower display shows flashing prompt while upper display shows its corresponding value. Press the DECREMENT key. The lower display shows steady prompt while upper display shows its corresponding value with a flashing digit. The value can be incremented or decremented by proper keys. The flashing digit is shifted to rotating left with SHIFT key. When MENU key is pressed value is entered and by pressing it twice comes to default mode. When MENU key is pressed for about 3 seconds SET level is entered and display is as shown. Press the SHIFT key. The next mode will be displayed, it is parameter mode. Press the DECREMENT key. The lower display will show the flashing prompt and the upper display will show the value of hysterisis. Press the DECREMENT key. The lower display shows steady prompt while upper display shows its corresponding value . The value can be incremented or decremented by proper keys. When MENU key is pressed value is entered and by pressing it twice comes to default mode. The lower display shows flashing prompt and upper display shows its corresponding value as shown. Press the SHIFT key. The hysterisis-2 will be displayed. The lower display shows flashing prompt while upper display shows its corresponding value. Press the DECREMENT key. The lower display shows steady prompt while upper display shows its corresponding value . The value can be incremented or decremented by proper keys. When MENU key is pressed value is entered and by pressing it twice comes to default mode.
  • Programming the Input TypeKey 4 Digit 8 Digit Descriptionsequence Display Display When MENU key is pressed for about 3 seconds SET level is entered and display is as shown. Press the SHIFT key. The next mode will be displayed, it is parameter mode. Press the SHIFT key. The next mode will be displayed, it is configuration mode. Press the DECREMENT key. Selection of input level is enterwd Press the DECREMENT key. Selection of input can be made. K thermocouple is selected. If it is acceptable press MENU key to enter the selection and again press MENU twice to go back to default mode. Press the INCREMENT key if next type of input is desirable. Selection of input can be made. J thermocouple is selected. If it is acceptable press MENU key to enter the selection and again press MENU twice to go back to default mode. Press the INCREMENT key if next type of input is desirable. Selection of input can be made. K thermocouple is selected. If it is acceptable press MENU key to enter the selection and again press MENU twice to go back to default mode. Press the INCREMENT key if next type of input is desirable. Selection of input can be made. K thermocouple is selected. If it is acceptable press MENU key to enter the selection and again press MENU twice to go back to default mode. Press the INCREMENT key if next type of input is desirable. Selection of input can be made. Pt-100 is selected. Resolution is 1 0 C. If it is acceptable press MENU key to enter the selection and again press MENU twice to go back to default mode. Press the INCREMENT key if next type of input is desirable. Selection of input can be made. Pt-100 is selected. Resolution is 0.1 0 C. If it is acceptable press MENU key to enter the selection and again press MENU twice to go back to default mode. Press the INCREMENT key if next type of input is desirable. Display is as shown. To go to output mode press the SHIFT key. Display is as shown. Output mode is highlighted by the flashing prompt. Press the DECREMENT key. Display is as shown. Relay Output mode is Heat mode which is highlighted by the flashing prompt. If it is acceptable press MENU key to enter the selection or press the INECREMENT key to goto next type. Display is as shown. Relay Output mode is cooL mode which is highlighted by the flashing prompt. If it is acceptable press MENU key to enter the selection or press the INECREMENT key to goto next type. Display is as shown. To go to output mode press the SHIFT key. Display is as shown. Output mode is highlighted by the flashing prompt. Press the DECREMENT key.
  • Key 4 Digit 8 Digit Descriptionsequence Display Display Display is as shown. Output mode is highlighted by the flashing prompt. Press the DECREMENT key. Display is as shown. Relay Output mode is Heat mode which is highlighted by the flashing prompt. If it is acceptable press MENU key to enter the selection or press the INECREMENT key to goto next type. Display is as shown. Relay Output mode is cooL mode which is highlighted by the flashing prompt. If it is acceptable press MENU key to enter the selection or press the INECREMENT key to goto next type. Display is as shown. Time unitt mode is Sec mode which is highlighted by the flashing prompt. If it is acceptable press MENU key to enter the selection or press the INECREMENT key to goto next type. Display is as shown. Time unit mode is Min mode which is highlighted by the flashing prompt. If it is acceptable press MENU key to enter the selection or press the INECREMENT key to goto next type. Display is as shown. To go to output mode press the SHIFT key. Display is as shown. Output mode is highlighted by the flashing prompt. Press the DECREMENT key. Display is as shown. Output mode is highlighted by the flashing prompt. Press the DECREMENT key. Display is as shown. Timer mode is highlighted by the flashing prompt. Press the DECREMENT key. Display is as shown. Timer mode is enabled. Press increment key if Timer mode is not required. Display is as shown. Timer mode is disabled Press the MENU key for about 6 seconds. Lock level is entered. Press the DECREMENT key. Lock value is displayed. There are five lock values from 1 to 5. Lock1:all levels are open, Lock2:calibration is locked,Lock3:calibration and configuration are locked, Lock4: all levels are locked except SET level, Lock5: all are locked no changes can be made. Lock value can be incremented by INCREMENT key.
  • Key 4 Digit 8 Digit Descriptionsequence Display Display To Change the ADC0 Value Press the MENU key for about 9 seconds. Calibration level is entered only if lock value is 1. Press the DECREMENT key. The display shows the flashing prompt adc0. The eight digit model shows the corrosponding value. Press The DECREMENT key The display shows the flashing adc0 value. Press The INCREMENT key. Now the display reads the flashing 00 value. It means the new adc0 value is entered. The display shows the flashing prompt adc0. The eight digit model shows the corrosponding value. Press The SHIFT key. The display shows the flashing prompt adcG. The eight digit model shows the corrosponding value. Press The DECREMENT key The display shows the flashing adcG value. Press The INCREMENT key. Now the display reads the flashing value. It means the new adcG value is entered. The display shows the flashing prompt adc0. The eight digit model shows the corrosponding value. Press The SHIFT key. The display shows the flashing prompt adcG. The eight digit model shows the corrosponding value. Press The SHIFT key The display shows the flashing prompt zero. The eight digit model shows the corrosponding value. Press The DECREMENT key The display shows the flashing Zero value. Press The INCREMENT key. Now the display reads the flashing 00 value. It means the new Zero value is entered. The display shows the flashing prompt adc0. The eight digit model shows the corrosponding value. Press The SHIFT key. The display shows the flashing prompt adcG. The eight digit model shows the corrosponding value. Press The SHIFT key The display shows the flashing prompt zero. The eight digit model shows the corrosponding value. Press The SHIFT key The display shows the flashing prompt Span. The eight digit model shows the corrosponding value. Press The DECREMENT key The display shows the flashing Span value. Press The INCREMENT key. Now the display reads the flashing value. It means the new adcG value is entered.
  • Key 4 Digit 8 Digit Description sequence Display Display The display shows the flashing prompt adc0. The eight digit model shows the corrosponding value. Press The SHIFT key. The display shows the flashing prompt adcG. The eight digit model shows the corrosponding value. Press The SHIFT key The display shows the flashing prompt zero. The eight digit model shows the corrosponding value. Press The SHIFT key The display shows the flashing prompt Span. The eight digit model shows the corrosponding value. Press The SHIFT key The display shows the flashing prompt Ambt. The eight digit model shows the corrosponding value. Press The DECREMENT key Know Your ProductDescription Decrement key- Decrements the Four/Eight Digit Display AA)Process Value display window displayed value, decrements the sub- Relay status LEDs BB)Status LEDs indicate the status of level. Keyboard Crelay output. Shift key- shifts the flashing digit toC)Keyboard ( 4 keys ) rotating left, increments the column. Menu Key Increment KeyMenu key-Selects different modes, Shift Key Decrement Keyenters the keyed value, incrementsthe level, increments the sub-levelIncrement key- Increments thedisplayed value or selects the nextparameter. A A A A A A A C B C B A B B B B C C C C C C B B Dimensional Details 96 96 65 92 10 72 72 100 67 10 72 67 96 9248 48 120 45 92 10 96 96 10 120 96 92 96 45
  • SecificationsINPUT On-Line Data LoggingThermocouple : J & K. Interface : RS-232c.resistance range: 100. maximum Protocol : OES standard Ascii protocol.Burnout function: Standard feature (up scale) Baud Rate : 9600 bits/sec.Cold junction compensation : Built in electrical Data Bits : 7 or 8 bits.ADC : Dual slope. Parity : None.Resolution: Better than 14 bits. Stop Bit : One.Sampling cycle: 400 msec. (2.5 samples/sec.) PC end capturing : Hyperterminal.PV digital filter: OFF, 1~16. Data Processing and manipulation : ExcelRange TechnicalK Thermocouple : -50 0 C ~ 1250 0 C.. CPU : 8 bit Micro-controller.J Thermocouple : -50 0 C ~ 700 0 C.. Programme Memory : 8 K programme memoryPt-100 : -50 0 C ~ 500 0 C. max.Pt-100 ( 0.1 C) : -50 0 C ~ 200 0 C. 0 System & programme variables : 1 K EEPROM. Data, stack & user definable : 256 RAM. A to D conversion : Accurate 14 BitResolution ADC.Sampling rate : 2sampls / sec Watchdog timer : Combination of hardware &Thermocouple : 1 0 C. software.RTD (Pt-100 ) : 0.1 0 or 1 0 C. Software : ICPI based system software.Control output PhysicalControl action On/Off Mounting method : Panel .flush mounting.Hysteresis width 0 to 100% of measuring External terminal : Screw terminal.range; For on/off action only Dimensions : 72 X 72 X 110 mm ( 72 model ), 96Relay contact : SPDT, 220 VAC/30 V DC, 5A X96 X70 mm ( 1/4 DIN model ),(resistive load). 48 X96 X70 mm ( 1/8 DIN vertical model ), 96 X48 X70 mm ( 1/4 DIN horizontal model ),Accuracy Weight : 250 gms.Indication accuracy : Thermocouple -± (0.25%of measuring range) ± 1 digit ±1°C. AmbientRTD - ±(0.25% of measuring range) ±1 digit. 0Relay Cut off : 1 C. Ambient operating temperature : 5 to 50°C.Reference junction compensation accuracy : Ambient operating humidity : Less than 90%±1°C at 25°C RH (no condensation). Storage temperature :0 to 60°C.Keyboard and DisplayParameter setting method : Digital setting by 4 Timer Functionkeys; Key lock function provided. Start : Automatic, when process value exceedsDisplay : 4 digit single window or 8 digit double the set value Timer startswindow. Setting 0 to 9999 sec/min, set in 1 sec/min steps.Display unit : Process value/set value displayed Action : Timer stops when time count exceedsindividually 4 digits, 7-segment red LED. the set time count.Hight of digit : 12.5 mm for upper display, 12.5 Signal output :Output relay 2mm for lower display for 96 model, 7.5 mm forlower display of 72 model.Status display LED : Control output of relay. Power SMPS Power supply voltage :100 (-15%) to 240V (+10%) AC, 50/60Hz. Power consumption : About 6VA.
  • Description of OperationWhen mounting and wiring are complete unit is ready to turn on. Turn on the power supply. Display will show the currentprocess temperature. Press the selector switch/key, now it will show the set value. By means of set screw, set it todesired value. For EAP series instrument again press the selector switch, process temperature will be on the display.Now if wiring is done in relay energised mode the relay will be in energised state and the LED will be ON. Now processtemperature starts increasing, when it crosses the set value the relay will be off, disconnecting external electricalcircuit.The relay- on LED will go off. There are only two states that is relay on and relay off . Due to heat mass of thesystem the temperature will go on rising to a certain value and starts decreasing. When it crosses the value about 2 0 Cbelow the set value, relay again goes on connecting the electrical circuit so that heaters will be on again. The processtemperature drops to a certain minimum value due to heat mass and again starts increasing. The cycle goes oncontinuously. The nature of control is of oscillating type.On--Off Control ActionThis type of control action is widely used in industrial processes. There are only two states ON state & OFF state andno intermidiate step is there. The controlled temperature cycles around the set point as shown in fig. The maximumtemp. above set point is called overshoot while minmum temp. below set point is called undershoot. The degree ofovershoot or undershoot depends upon the system characteristics & not upon the controller. It generallydepends upon sensor response time, time lag, capacity of heating systems, total heat mass of the systems etc.. Whenheat mass of system >> than the heat mass of heating system, on-off controller shows good results with minimum Overshoot Setpoint Hysterisis Temperature Undershoot Startup period TimeSensor PlacementProper sensor placement can eliminate many problems in a control systems. The sensor should be placed so that it candetect any temperature change with minimum thermal lag. The sensor tip is the sensing element in the system & mustbe in direct contact with the process material to provide optimum sensing accuracy. One inch immersion is usuallysatisfactory for either liquid or solid applications.In a process that requires fairly constant heat output,the sensor should be placed close to the heater . In a processwhere heat demand is variable, the sensor should be closer to the operating area. Some experimenting with the sensorlocation is often required to find the optimum location. In a liquid prosess, the use of stirrer will eliminate the thermallag. As thermocouples are point measuring devices placing more than one sensor in parallel will provide an averagetemp. reading & produce better results in most processes. Proper sensor type is also a very important factor inobtaining precise measurements. The sensor must have the correct temp. range to meet the process requirements.Standard sensor limits of error are +2 degree celcius plus drift caused by improper protection or an over temp.occurance. This error is far greater than the controller error & can not be corrected at the sensor end except by properselection & replacement.CautionsAs the signals generated by the thermocouples & resistance bulbs are at low levels, complete protectionagainst induction noise of external origin should be provided.1 ) Place the thermocouple circuit as wide apart as possible from the power supply circuit. Shielding wiresare recommended.2 ) Keep the thermocouples at a distance from strong magnetic fields.3 ) Extend the compensation conductors to the terminals of theinstruments.
  • Manual Calibration ProcedureStep 1: To enter the Calibration LevelOpen Lock position to 1.Hold Menu key for at least 9 seconds.Program will enter the Calibration Level and Display will ShowPress the Decrement key and display will showAgain press the Decrement key.Step2: To calibrate the zero of ADCShort terminals 1 and 2.The Display will show arbitrary value.Press the Increment key.The program calculates the zero value of ADC and display will showIf input is not shorted then Display will show and calibration of ADC0 fails.Step3: to calibrate the Gain of ADCBy pressing of the Menu key enter the sub-level 2 of calibration levelPress Shift key and the Display will showPress the Decrement keySend a 50 mV signal to terminals 1 and 2 with proper polarity.Press the Increment key.The program calculates the Gain value of ADC and display will show a value between9000 and 9999.If input is not proper then Display will show and calibration of ADCG fails.Step3: to calibrate the Zero of PT-100By pressing of the Menu key enter the sub-level 2 of calibration levelPress Shift key twice and the Display will showPress the Decrement keySend a 100 ohms signal to terminals 1, 2 and 3 with proper polarity.Press the Increment key.The program calculates the zero value of PT-100 and display will showIf input is not proper then Display will show and calibration of PT-100 fails.Step4: to calibrate the Span of PT-100By pressing of the Menu key enter the sub-level 2 of calibration levelPress Shift key thrice and the Display will showPress the Decrement keySend a 300 ohms signal to terminals 1, 2 and 3 with proper polarity.Press the Increment key.The program calculates the Span value of PT-100 and display will show a value between9000 and 9999.If input is not proper then Display will show and calibration of PT-100 fails.Step4: to calibrate the AmbientBy pressing of the Menu key enter the sub-level 2 of calibration levelPress Shift key four times and the Display will showWith Increment key, Decrement key and Shift key adjust the ambient value.
  • Troubleshooting ChartAlthough all EAP & ETP series instruments are manufactured &shipped under a strict product quality control system,should any trouble occur, please inform the manufacturer. The troubleshooting chart provided here can be used incase any trouble occurs. The causes marked with asterisks (*) can be repaired simply. You are requested to checkthese items before informing us.Trouble : Temperature Indication1] No display at allNo power supply :Check power supplyLoose power supply connection :Correct connectionsNone of above Consult dealer or manufacturer2] Display shows “oPEn”For T/c inputSensor is open :Check & replace the sensor. Compensation coil is open:Replace it & re-calibrate.Loose sensor or coil connections :Correct connections.For Rtd inputShort-circuit of sensor connecting part :Check & correct.Internal short-circuit of sensor :Check & replace if necessary.Single wire end of sensor disconnected :Connect the wire end.3] The temperature doesn’t change from ambient for T/C inputShort ckt of sensor connecting part :Check & correct.Internal short-ckt of sensor :Check & replace.Power to external heater ckt is off :Check & correct.Relay driver circuit4] Unstable Temperature IndicationTrouble in sensor itself :Check & replace.Faulty contact of sensor connections :Check & correct.Unstable mounting of sensor :Check for sensor mounting.Entrance of noise to the power source :Check and remove the noise or sensor line source.Trouble in signal amplifier or power :Refer to dealer/ manufacturer.Source5] Temperature decreases instead of increase in Temp.Polarity of T/C is reversed :Connect T/C as shown.Single wire end of Rtd is connected to :Check & correct.Terminal no. 2 or 3 instead of to no.1None of above :Consult manufacturer.6] The Diffence. between actual and indicated temperature is largeDeteriorated sensor characteristics :Replace the sensor.Different type of sensor is used :Check sensor type & replace.Calibration of instrument is disturbed :Recalibrate the instrument against a tracable calibrator.None of above :Consult manufacturer.Trouble : Defective Control1] Doesn’t Control ProperlyIncorrect wiring of heater circuit :Check & correct.Disconnection of heater :Check & correct.Trouble in Relay drive unit :Consult manufacturer.2] The difference between the set value and indicated value is largeImperfect installation of sensor :Install the sensor properly.Heater capacity is too large or too small :Redesign the heater capacity. (Refer section on-off control action). Inadequate position of sensor & heater
  • How to receive data from instrument to PC?1) Start the hyper terminal which is integrated component of MS-98 and upwards. Start >Programs > Accessories > Communication > Hyper Terminal2) Click on hyperetrminal. A dialog box New connection will open. Name the file as peryour choice, choose the icon you prefer and click OK.3) Again Hyper Terminal will open another dialog box Connect To. In this dialog box thefourth data field connect using is to be filled with proper com port number on your computere.g. com1 or com2 etc. Click OK.4) Again Hyper Terminal will open another dialog box Com Properties. In this box propervalues are to be filled in respective data fields. Bits per second 9600 Data Bits 8 Parity None Stop Bits 1 Flow Control NoneClick on OK.5) Hyper Terminal connects your computer to external instrument. Now you will have to setProperties. For this go to File menu. Click Properties. Hyper terminal will open a dialog box(File name) Properties. Click Settings Tab. Select Auto Detect on Emulations. Again click onASCII Setup Button.ASCII Sending select Send line ends with line feeds deselect Echo type…….. Fill line Delay with 100 msec Fill character delay with 2 msec.ASCII Receiving deselect all three fields.Click OK. Now hyper terminal is configured correctly.6) To receive data in text format, click Transfer on Menu Bar. Click Capture Text. Enterthe correct path you desire using browse button. Click Start. Hyper terminal will create a textfile in desired folder and stores data in it.7) To start receiving data click Transfer on Menu Bar. Click Send Text File. Enter thecorrect path of the file to be send using browse button. Click Open, now the data starts comingfrom the instrument to computer and logs in the file specified in capture.8) This saved file is in text format and can be opened in Excel and can be furtherprocessed accordingly.