red lion T48 - Thermocouple Cold Junction Calibration (CJC); RTD Ohms Calibration (rtd); Main or Second Linear DC Analog Output Calibration; Remote Setpoint Calibration

Thermocouple Cold Junction Calibration (CJC)
This procedure must be performed AFTER an accurate mV calibration.
1. Exit Factory Service Operations (press D) and return to Normal Display
Mode.
2. Connect a thermocouple probe of known accuracy to the controller (Types
T, E, J, K, and N only). Select the probe type used in Configure Module 1.
3. Connect a reference temperature probe to the measuring end of the T48
thermocouple probe. The two probes should be shielded from air
movement and allowed sufficient time to equalize in temperature. (As an
alternative, the T48 thermocouple probe may be placed in a calibration
bath of known temperature.)
4. Compare controller display with reference temperature probe (or
calibration bath). If the displayed controller temperature does not equal the
reference probe temperature, calculate the CJ Error as follows:
CJ Error = reference probe temperature - displayed controller temperature
5. Enter Factory Service Operations Module (9-FS).
Display Parameter Description/Comments
CJC Cold Junction
Temperature
Observe the indicated cold junction
temperature. Add the calculated CJ Error to
the displayed value. Enter the sum as the new
value for CJC. Exit 9-FS and repeat step 4.
Note: If the initial value for CJC is not within
the range 15.0°C to 40.0°C, enter 25.0°Cfor
CJC and repeat the Cold Junction Calibration
procedure.
RTD Ohms Calibration (rtd)
This procedure must be performed AFTER an accurate mV calibration.
Connect one leg of precision resistance (accuracy of 0.1 ohm) to terminals #9
and #10 together, and the other leg to #8.
Display Action Description/Comments
Rtd1 Connect 0.0 ohm (jumper wire) Wait 10 seconds, press P.
Rtd2 Connect 277.0 ohm Wait 10 seconds, press P.
Main or Second Linear DC Analog Output Calibration
1. Set the Linear DC Output jumper for the range to be calibrated. (See Linear
DC Analog Output Jumper Selection, page 12).
2. Connect a meter with an accuracy of 0.05% or better to the output.
3. For each step, use the controller arrow keys to adjust the external meter
display to match the parameter being calibrated. Press P when the output
is correct, or if the parameter is not being calibrated.
Display Parameter External Meter Action
C 0V 0 V Calibration 0.00 Adjust if necessary, press P.
C 10V 10 V Calibration 10.00 Adjust if necessary, press P.
C 0c 0 mA Calibration 0.00 Adjust if necessary, press P.
C 20c 20 mA Calibration 20.00 Adjust if necessary, press P.
Remote Setpoint Calibration
Connect DC mA source with an accuracy of 0.03% or better.
Display Action Description/Comments
StP1 Apply 0 mA Wait 10 seconds, press P.
StP2 Apply 5 mA Wait 10 seconds, press P.
StP3 Apply 10 mA Wait 10 seconds, press P.
StP4 Apply 15 mA Wait 10 seconds, press P.
StP5 Apply 20 mA Wait 10 seconds, press P.
Heater Current Input Calibration
Connect AC mA source with an accuracy of 0.1% or better.
Display Action Description/Comments
StP1 Apply 0 mA AC Wait 10 seconds, press P.
StP2 Apply 5 mA AC Wait 10 seconds, press P.
StP3 Apply 50 mA AC Wait 10 seconds, press P.
StP4 Apply 75 mA AC Wait 10 seconds, press P.
StP5 Apply 100 mA AC Wait 10 seconds, press P.
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