Watlow PM LEGACY PM3 User Manual page 118

Calibration of Analog Inputs:
To calibrate an analog input, you will need to provide a source of two electrical signals or
resistance values near the extremes of the range that the application is likely to utilize. See
recommended values below:
Sensor Type
thermocouple
millivolts
volts
milliamps
100 Ω RTD
1,000 Ω RTD
thermistor 5 kΩ
thermistor 10 kΩ
thermistor 20 kΩ
thermistor 40 kΩ
potentiometer
Note:
The user may only calibrate one sensor type. If the calibrator interferes with open thermo-
couple detection, set Sensor Type
livolt instead of Thermocouple
ЛЏ u
open thermocouple detect circuit for the duration of the calibration process. Be sure to set
sensor type back to the thermocouple type utilized.
Note:
The Electrical Measurement value, will be in the units that are selected. I.E. Millivolts, volts,
milliamps, or ohms.
1. Disconnect the sensor from the controller.
2. Record the Calibration Offset
Input Menu then set value to zero.
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3. Wire the precision source to the appropriate controller input terminals to be calibrated. Do
not have any other wires connected to the input terminals. Please refer to the Install and
Wiring section of this manual for the appropriate connections.
4. Ensure the controller sensor type is programmed to the appropriate Sensor Type
utilized in the Setup Page
5. Enter Factory Page
6. Select the Calibration
input to be calibrated.
7. Set Electrical Input Slope
cancel any prior user calibration values)
8. Input a Precision Source Low value. Read Electrical Measurement value
via PM3 LEGACY ™ PID Configurator or RUI. This will be referred to as Electrical Measured
Low. Record low value ______________
9. Input a Precision Source High value.
Wa tl ow P M3 L E GAC Y
Precision Source Low
0.000 mV
0.000 mV
0.000V
0.000 mA
50.00 Ω
500.0 Ω
sEn
tC
parameter value in the Operations Page
i. C a
, Analog Input Menu
sEt
, Calibration Menu
fCty
input instance to be calibrated. This corresponds to the analog
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to 1.000 and Electrical Input Offset
ELi. s
™ P ID Co n tro ll e r
50.00
150.0
1,800
1,700
0.000
in Setup Page
sEt
to avoid interference between the calibrator and
.
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via front panel or Configurator Software.
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118
• •
Precision Source High
50.000 mV
50.000 mV
10.000V
20.000 mA
350.0 Ω
3,500 Ω
5,000
10,000
20,000
40,000
1,200
, Analog Input Menu
opEr
to 0.000 (this will
ELi. o
of controller
ЛЏu
C hap te r 9 Features
to mil-
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, Analog
to be
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