18 26-03-2004 123200 03
• If supply voltage is lower than
22V, replace POWER PCB
and
adjust POWER PCB.
Error:
Likely cause: Solution:
The measured temperature is
out of range:
Check RTD sensor (not CTC-1200
A)
At 23°C the impedance should be:
• 1090 ohm ±20 ohm (CTC-
140 A, CTC-320 A/B, MTC-
140/320 A)
or
• 109 ohm ±3 ohm (CTC-650
A/B, MTC-650 A).
• If RTD sensor is OK, replace
CONTROLLER PCB and then
adjust and re-calibrate the unit.
• Otherwise, replace RTD sensor
and re-calibrate the unit.
Check thermocouple for open
circuit (CTC-1200 A only).
If the TC is broken, change the
entire well unit.
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