Calibration Errors, Troubleshooting and Remedies
Error Code 1: Sensor Zero too high.
The microprocessor was unable to make initial adjustment. The output from the
sensor-element is too high to adjust. This error can occur during step 4 of the
calibration procedure. A short sensor-element could result in this error. Check if
sensor wires are connected properly and firmly to the sensor terminals.
Error Code 2: Sensor Zero too low:
The microprocessor was unable to make initial adjustment. This error can occur
during step 4 of the calibration procedure. Check if the sensor wires are not loose
and are connected properly to the terminals. Also check that the sensor supply
voltages are correct.
Check the voltages on SENSOR terminal as follows:
Place the black (ground) probe of the volt meter on the green wire ( − ). With the red
voltmeter probe check to voltage on red wire (+) terminal to be +5 volts ±0.1.
Similarly place the red probe on the black wire and verify the voltage to be –5 volts
±0.1.
Error code 3: Calibration Time Out:
After initial adjustment the unit waits maximum of 60 seconds for the calibration
gas. Calibration is aborted if no calibration gas is detected by the microprocessor.
Check for the leaks in the calibration apparatus and check the flow rate. Always use
a calibration adapter and proper flow rate. A completely dead sensor could also
result in this error.
Error code 4: Not enough Sensor reaction to gas:
At the end of the calibration cycle the microprocessor checks for the adequate sensor
reaction to the calibration gas. This error code is displayed when sensitivity of the
sensor to the calibration gas applied is extremely low and the microprocessor is
unable to make final adjustments. This error can also occur when there is
insufficient flow of the calibration gas to the sensor. Also check if the calibration gas
has not expired and be sure to use the calibration adapter and check the calibration
apparatus for leaks.
Error code 5: Sensor May be bad:
The sensor detected the flow of the calibration gas but the sensitivity to the gas is not
consistent. Double check the wires connecting the sensor head. And repeat the
calibration procedure after few minutes. If same error reoccurs the sensor head
assembly must be replaced.
PT295 Series Toxic Sensor Rev 5.1
24
To Next Page