Checks And Calibration; Main Input Check; Mv Reading Check (Cn63100); Thermocouple Cold Junction Temperature Check (Cn63100) - Omega CN63100 Series User Manual

CHECKS AND CALIBRATION

The instrument has been fully calibrated at the factory for all input types. If
the unit appears to b e indicating o r controlling incorrectly, see
Troubleshooting, page 71, before attempting this procedure.
If the controller is suspected of reading incorrectly, the instrument may be
checked for indication accuracy without disturbing the factory calibration.
The following procedures may be used for this purpose.
Note: Allow 1/2 hour warm-up before checking these parameters.

MAIN INPUT CHECK

mV Reading Check (CN63100)

1. Connect a DC mV source with an accuracy of 0.03% or better to terminal #8
(-) & #9 (+).
2. Configure Input Parameters Module 1 for linear mV (lin) input, under
tYPE.
3. Compare the controller read-out to the standard at various points over the
range (-5.00 mV to 56.00 mV). The tolerance is ±(0.15% of reading +1
LSD).
4. Calibrate the controller if the readings are out of tolerance.

Thermocouple Cold Junction Temperature Check (CN63100)

1. Connect a thermocouple probe of known accuracy (Types T, E, J, K, N
only) to controller. Select the probe used in Configure Module 1.
2. Connect a reference temperature probe to measuring end of thermocouple
to monitor temperature. Allow sufficient time for temperatures to equalize.
3. Compare controller display with reference temperature probe. The
controller display should equal the calibrated probe temperature.
(Tolerance is ±1°C).
4. Calibrate the cold junction temperature if out of tolerance.

RTD Ohms Reading Check (CN63100)

1. Connect RTD simulator (with an accuracy of 0.1 ohm or better) capable of
operating with less than 150 μA to terminals #8, #9, & #10.
2. Configure Input Parameters Module 1 for linear ohms (rLIn) input, under
tYPE.
3. Compare the controller read-out with the RTD simulator at various points
over the range 1.0 to 300.0 ohms. The tolerance is ±(0.3% of span ±1LSD).
4. Calibrate the controller RTD ohms if out of tolerance.

Voltage Check (CN63300)

1. Connect a DC voltage source with an accuracy of 0.1% or better. Apply a 0
to 10 V signal to terminals #8 (-) & #9 (+).
2. In Input Module 1, configure input signal InP1 and display value dSP1 to
0.00. Configure input signal InP2 and display value dSP2 to 10.00.
3. Compare the controller readout to the voltage source over the range (0-10 V).
The tolerance is ±(0.3% of reading +0.03 V).
4. Calibrate the controller if the readings are out of tolerance.

Current Check (CN63300)

1. Connect a DC current source with an accuracy of 0.1% or better. Apply a 0
to 20 mA signal to terminals #8 (-) & #10 (+).
2. In Input Module 1, configure input signal InP1 and display value dSP1 to
0.00. Configure input signal InP2 and display value dSP2 to 20.00.
3. Compare the controller readout to the current source over the range (0-20
mA). The tolerance is ±(0.3% of reading +0.04 mA).
4. Calibrate the controller if the readings are out of tolerance.

Remote Setpoint Input Check (CN63100 and CN63300)

1. Connect a DC current source with an accuracy of 0.03% or better. Apply a 0
to 20 mA signal to terminals 13 (+) and 14 (-).
2. In Remote Setpoint Input Module 7, configure input signal InP1 and
display value dSP1 to 0.00. Configure input signal InP2 and display value
dSP2 to 20.00.
3. Compare the readout in the secondary main display to the current source
over the range (0-20 mA). The tolerance is ±(0.2% of full scale +½ LSD).
4. Calibrate Remote Setpoint Input if readings are out of tolerance.

Error Flag E-CL

If error flag "E-CL" appears at power-up, a loss of calibration parameters
due to noise spikes has occurred. Entering code 77 twice in Factory Service
Operations Module (9-FS) erases the controller calibration values and
defaults the values to nominal settings. Reading errors of ±10% may result. It
is recommended that the controller be fully re-calibrated. If using
thermocouple only, the RTD calibration need not be performed.
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