Red Lion TCU - Manual (Page 93)

Millivolt Calibration (Cal)
Connect precision millivolt source with an accuracy of 0.01% to terminals
(+) #9 and (-) #10. Place the input sensor select jumper in the TC position.
Display Parameter Description/Comments
StP1 0.0 mV step Apply 0.0 mV, wait 10 seconds, press PAR.
StP2 9.00 mV step Apply 9.0 mV, wait 10 seconds, press PAR.
StP3 18.0 mV step Apply 18.0 mV, wait 10 seconds, press PAR.
StP4 27.0 mV step Apply 27.0 mV, wait 10 seconds, press PAR.
StP5 36.0 mV step Apply 36.0 mV, wait 10 seconds, press PAR.
StP6 45.0 mV step Apply 45.0 mV, Wait 10 seconds, press PAR.
StP7 54.0 mV step Apply 54.0 mV, wait 10 seconds, press PAR.
StP- Pause The controller imposes a 5 second delay.
(keep the 54 mV signal applied)
The unit then advances to CJC - NO.
Thermocouple Cold Junction Calibration (CJC)
This procedure must be performed AFTER an accurate mV calibration. Fix
internal input-select jumper to “TC” position.
1. Exit Factory Service Operations 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 TCU
thermocouple probe. The two probes should be shielded from air
movement and allowed sufficient time to equalize in temperature. (As an
alternative, the TCU 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
CJF
or
CJC Cold Junction
Temperature
Allow 5 minutes for temperature to
equalize.
Observe indicated cold junction
temperature. Add the calculated CJ Error
to the displayed value. Enter the sum as
the new value for CJC (or CJF).
Exit 9-FS and repeat Step 4.
Note: If the initial value for CJC (CJF) is
not within the range 15.0°C to 40.0°C
(59.0°F to 104.0°F), enter 25.0°C
(77.0° F) for CJC (CJF) and repeat the
Cold Junction Calibration procedure.
RTD Ohms Calibration (rtd)
This procedure must be performed AFTER an accurate mV calibration. Fix
internal input-select jumper to “RTD” position. Connect one leg of precision
resistance (accuracy of 0.1 ohm) to terminals #8 and #9 together, and the
other leg to #10.
Display Parameter Description/Comments
Rtd1 0.0 ohms step Connect 0.0 ohms resistance (jumper
wire), wait ten seconds, press PAR.
Rtd2 277.0 ohms step Connect 277.0 ohm resistance, wait ten
seconds, press PAR.
Analog Output Calibration (ANCL)
4 to 20 mA
Press PAR until ANCL appears in the display. Connect precision ammeter
(0.1% accuracy) to rear terminals (+) #11 and (-) #12.
Display Parameter Description/Comments
ANC1 Analog output 4 mA
code value Observe current reading. If 4.00 mA,
press PAR. If not equal, modify existing
code value using up and down buttons to
achieve 4.00 mA. Press PAR.
ANC2 Analog output 20 mA
code value Observe current reading. If 20.00 mA,
Press PAR. If not equal, modify existing
code value using up and down buttons to
achieve 20.00 mA. Press PAR.
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