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8.1.8 Temperature Sensors
The calibration will fail if the calculated offset is outside of -10 to 10.
Possible Cause
Corrective Action
Improper wiring of sensor to controller
Correct wiring
Temperature input is set to the incorrect element
Reprogram to match the connected temperature element
Faulty sensor
Replace sensor
8.2 Alarm Messages
NO SAMPLE
No Sample will be displayed if the measurement signals indicate excess air in the sample. In the Input Details menu, both the Sample
Measurement and Sample Reference mV will be between 0.4 and 0.7 times what the readings were in water during the last Water/
Sample Calibration (Water Measurement and Water Reference mV).
Liquid level too low for immersible sensor
Raise level or lower sensor
Sample pump failure
Repair or replace sample pump
Leak in or blockage of the sample line
Repair sample line
Excess air in sample tubing
Purge sample line of air. Check for leaks. Check orientation of
sensor. Make sure sample line inlet is not placed where there is air
or gas in the tank.
Contamination of the bath
A chemical in the bath may be absorbing at the reference wave-
length. Test the sensor in a sample of uncontaminated copper
solution.
Faulty sensor
Repair or replace sensor
Controller is faulty
Repair or replace controller
LAMP OUT
Lamp Out will be displayed if the measurement signals indicate almost no light getting through. In the Input Details menu, both the
Sample Measurement and Sample Reference mV will be less than 0.01 times what the readings were in water during the last Water/
Sample Calibration (Water Measurement and Water Reference mV).
Possible Cause
Corrective Action
Sensor wire(s) disconnected
Reconnect.
Lamp failure
Replace lamp
Dirty sensor
Clean or etch sensor
Faulty sensor
Repair or replace sensor.
Controller is faulty
Repair or replace controller
PLATE OUT
Plate Out will be displayed if the measurement signals indicate very light getting through. In the Input Details menu, both the Sample
Measurement and Sample Reference mV will be less than 0.4 times what the readings were in water during the last Water/Sample
Calibration (Water Measurement and Water Reference mV).
Water/Sample Calibration has not been performed, or performed
incorrectly
Perform a Water/Sample Calibration
Dirty sensor
Clean or etch sensor
Faulty sensor receptacle on controller
Replace
Faulty sensor
Repair or replace sensor
Controller is faulty
Repair or replace controller
HIGH or HIGH-HIGH ALARM
Occurs if the sensor reading rises above the high alarm set points. If your unit is programmed for an alarm relay output, the alarm
relay will activate. The controller will continue to check the sensor reading, and any outputs using the sensor will remain active.
Possible Cause
Corrective Action
The process went further out of control than normal.
May have to increase chemical flow rate.
The chemical supply has run out.
Replenish the chemical supply.
The pump or valve or supply line is faulty.
Repair or replace the control device.
