The document provides instructions for safely installing and configuring a temperature controller. Key steps include reading the manual before installation, ensuring proper power supply and input/output wiring configurations, and using the front panel keys to program set points, input types, and other parameters as needed for the control application. Safety precautions like switching off power before servicing and avoiding hazardous environmental conditions are also outlined.
2. Safty Instructions
These instrument are meant for temperature control applications. It is advisesable to read the user manual before
installation of the unit. All safety related instructions in this manual should be strictly observed to ensure the safety of
operating personnel as well as the instrument.
The instrument must be configured correctly for intended operation. Incorrect configuration may damage the
instrument or the process under control or it may lead to personnel injury.
Warning
Dangerous voltages are present in this instrument. Before installation or begining of any trouble-shooting procedure
the 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,don't expose this instrument to excessive humidity or water.
Avoid using this instrument in areas subject to hazardous conditions like excessive vibration,dirt,excessive humidity
corrosive gases & oils etc. The average ambient conditions should not exceed the maximum ratings specified in
Technical Details section.
.
Unpacking
Upon receipt of the shipment remove the instrument from the carton & check for the instrument,mounting clamps,User
mannual. Inspect the instrument for shipping damages.In case of damage report it to your nearest dealer & shipping
agency for the claim.Write down the model no. Serial no. for future referance when corrosponding with our service
department.
Installation
The 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 leading
to 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 interferences
Mounting
The 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 the
panel ( 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 it
alternatly 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
3. Wiring
a) 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 not
exceeded.
c) It is always recomonded that the power to the instrument be protected by fuses or circuit braker rated at the
minimum value possible.
d) The instrument must be installed inside a suitably grounded metal enclosure to prevent the live parts being accesible
to 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 the
instrument.
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 this
reason it is recomonded that the use of shielded thermocouple extension wire which connects from the sensor to the
controller.
Power Supply Wiring
These controllerare supplied to operate at 90 - 270 VAC. Check that installation voltage corresponds with the
power rating.
Local requirements regarding electrical installation should be rigidly observed. Consideration should be given to
prevent 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
8
Input Wiring
Thermocouple and RTD wiring
For thermocouple input connections the correct type of thermocouple lead wire extension or proper compensating
cable must be used for entire distance between the thermocouple and the instrument, ensuring that the correct
polarity is observed throughout. Joints in cable must be avoided. If the length of thermocouple plus extension wire
is 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 ends
are connected to terminals 2 & 3 respectivly. The three wire leg offers the capability of lead resistance
compensation provided that three leads should be of same length and gauge. For two wire RTD terminals 2 and 3
must 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
4. Linear DC Input Wiring
Connections for linear DC voltage or current input are shown as below. Polarity must be observed as indicated. A
resistance 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
8
Output Wiring
Connections for output are as below. The rated relay is for 5 Amp @ 230 VAC. The load must be resistive for
rated output. If load is inductive the current ratings must be less than 60% of rated output. Snubber attacment is
recomended 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
5. Programming Set-Point1
Key 4 Digit 8 Digit Description
sequence 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.
6. Programming the Input Type
Key 4 Digit 8 Digit Description
sequence 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.
7. Key 4 Digit 8 Digit Description
sequence 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.
8. Key 4 Digit 8 Digit Description
sequence 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.
9. 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 Product
Description Decrement key- Decrements the Four/Eight Digit Display A
A)Process Value display window displayed value, decrements the sub- Relay status LEDs B
B)Status LEDs indicate the status of level. Keyboard C
relay output. Shift key- shifts the flashing digit to
C)Keyboard ( 4 keys ) rotating left, increments the column. Menu Key Increment Key
Menu key-Selects different modes, Shift Key Decrement Key
enters the keyed value, increments
the level, increments the sub-level
Increment key- Increments the
displayed value or selects the next
parameter.
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 92
48 48 120 45 92
10
96 96 10
120
96 92 96 45
10. Secifications
INPUT On-Line Data Logging
Thermocouple : 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 : Excel
Range Technical
K 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 memory
Pt-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 Bit
Resolution 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 Physical
Control 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 ), 96
Relay 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. Ambient
RTD - ±(0.25% of measuring range) ±1 digit.
0
Relay 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 Display
Parameter setting method : Digital setting by 4 Timer Function
keys; Key lock function provided. Start : Automatic, when process value exceeds
Display : 4 digit single window or 8 digit double the set value Timer starts
window. 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 exceeds
individually 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 2
mm for lower display for 96 model, 7.5 mm for
lower 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.
11. Description of Operation
When mounting and wiring are complete unit is ready to turn on. Turn on the power supply. Display will show the current
process temperature. Press the selector switch/key, now it will show the set value. By means of set screw, set it to
desired 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 process
temperature starts increasing, when it crosses the set value the relay will be off, disconnecting external electrical
circuit.The relay- on LED will go off. There are only two states that is relay on and relay off . Due to heat mass of the
system the temperature will go on rising to a certain value and starts decreasing. When it crosses the value about 2 0 C
below the set value, relay again goes on connecting the electrical circuit so that heaters will be on again. The process
temperature drops to a certain minimum value due to heat mass and again starts increasing. The cycle goes on
continuously. The nature of control is of oscillating type.
On--Off Control Action
This type of control action is widely used in industrial processes. There are only two states ON state & OFF state and
no intermidiate step is there. The controlled temperature cycles around the set point as shown in fig. The maximum
temp. above set point is called overshoot while minmum temp. below set point is called undershoot. The degree of
overshoot or undershoot depends upon the system characteristics & not upon the controller. It generally
depends upon sensor response time, time lag, capacity of heating systems, total heat mass of the systems etc.. When
heat 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
Time
Sensor Placement
Proper sensor placement can eliminate many problems in a control systems. The sensor should be placed so that it can
detect any temperature change with minimum thermal lag. The sensor tip is the sensing element in the system & must
be in direct contact with the process material to provide optimum sensing accuracy. One inch immersion is usually
satisfactory 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 process
where heat demand is variable, the sensor should be closer to the operating area. Some experimenting with the sensor
location is often required to find the optimum location. In a liquid prosess, the use of stirrer will eliminate the thermal
lag. As thermocouples are point measuring devices placing more than one sensor in parallel will provide an average
temp. reading & produce better results in most processes. Proper sensor type is also a very important factor in
obtaining 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 proper
selection & replacement.
Cautions
As the signals generated by the thermocouples & resistance bulbs are at low levels, complete protection
against induction noise of external origin should be provided.
1 ) Place the thermocouple circuit as wide apart as possible from the power supply circuit. Shielding wires
are recommended.
2 ) Keep the thermocouples at a distance from strong magnetic fields.
3 ) Extend the compensation conductors to the terminals of the
instruments.
12. Manual Calibration Procedure
Step 1: To enter the Calibration Level
Open Lock position to 1.
Hold Menu key for at least 9 seconds.
Program will enter the Calibration Level and Display will Show
Press the Decrement key and display will show
Again press the Decrement key.
Step2: To calibrate the zero of ADC
Short 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 show
If input is not shorted then Display will show and calibration of ADC0 fails.
Step3: to calibrate the Gain of ADC
By pressing of the Menu key enter the sub-level 2 of calibration level
Press Shift key and the Display will show
Press the Decrement key
Send 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 between
9000 and 9999.
If input is not proper then Display will show and calibration of ADCG fails.
Step3: to calibrate the Zero of PT-100
By pressing of the Menu key enter the sub-level 2 of calibration level
Press Shift key twice and the Display will show
Press the Decrement key
Send 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 show
If input is not proper then Display will show and calibration of PT-100 fails.
Step4: to calibrate the Span of PT-100
By pressing of the Menu key enter the sub-level 2 of calibration level
Press Shift key thrice and the Display will show
Press the Decrement key
Send 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 between
9000 and 9999.
If input is not proper then Display will show and calibration of PT-100 fails.
Step4: to calibrate the Ambient
By pressing of the Menu key enter the sub-level 2 of calibration level
Press Shift key four times and the Display will show
With Increment key, Decrement key and Shift key adjust the ambient value.
13. Troubleshooting Chart
Although 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 in
case any trouble occurs. The causes marked with asterisks (*) can be repaired simply. You are requested to check
these items before informing us.
Trouble : Temperature Indication
1] No display at all
No power supply :Check power supply
Loose power supply connection :Correct connections
None of above Consult dealer or manufacturer
2] Display shows “oPEn”
For T/c input
Sensor is open :Check & replace the sensor. Compensation coil is open:Replace
it & re-calibrate.
Loose sensor or coil connections :Correct connections.
For Rtd input
Short-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 input
Short 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 circuit
4] Unstable Temperature Indication
Trouble 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.
Source
5] 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.1
None of above :Consult manufacturer.
6] The Diffence. between actual and indicated temperature is large
Deteriorated 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 Control
1] Doesn’t Control Properly
Incorrect 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 large
Imperfect 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
14. 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 Terminal
2) Click on hyperetrminal. A dialog box New connection will open. Name the file as per
your choice, choose the icon you prefer and click OK.
3) Again Hyper Terminal will open another dialog box Connect To. In this dialog box the
fourth data field connect using is to be filled with proper com port number on your computer
e.g. com1 or com2 etc. Click OK.
4) Again Hyper Terminal will open another dialog box Com Properties. In this box proper
values are to be filled in respective data fields.
Bits per second 9600
Data Bits 8
Parity None
Stop Bits 1
Flow Control None
Click on OK.
5) Hyper Terminal connects your computer to external instrument. Now you will have to set
Properties. 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 on
ASCII 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. Enter
the correct path you desire using browse button. Click Start. Hyper terminal will create a text
file in desired folder and stores data in it.
7) To start receiving data click Transfer on Menu Bar. Click Send Text File. Enter the
correct path of the file to be send using browse button. Click Open, now the data starts coming
from 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 further
processed accordingly.