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11-4. Replacement of Sensor Unit
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Return the used sensor unit to your local representative.
•
Calibrate the sensor unit after replacement.
•
The sensor may need some time to stabilize after replacement. Energize the detector to
allow the sensor to stabilize, then perform the zero adjustment and the span adjustment.
•
To do calibration, always perform zero adjustment first, and then perform span
adjustment.
•
If any error is displayed, refer to 10. Trouble Alarm.
WARNING
Be sure to turn OFF the indicator unit, signal converter or main body equipment before
replacing a sensor unit. Otherwise, they may become a source of ignition.
Be sure that the sensor and the sensor connector have been firmly connected to the
detector before the power is turned on.
If the sensor and the detector are incorrectly
connected, the detector cannot detect gas.
The dimensions of flameproof joint between casing and casing cover of KD-12 flameproof
housing are exceeding the minimum requirements stated EN/IEC60079-1. Please contact
the manufacturer for inspection, repair and/or adjustments of this flameproof.
CAUTION
Only your local representative’s maintenance service members or personnel who have
completed a maintenance seminar can replace the sensor unit.
The external contact may operate when replacing the sensor unit if the sensor output is
not stable. Release the interlocks of the external devices if needed.
Make sure that the mesh of the sensor casing is free of dirt or dust. Clean the mesh
before installing the sensor casing to the detector.
Be sure to handle the sensor unit with care. Do not drop or throw the sensor unit. Failure
to do so may lead to broken wire or sensor failure.
When removing or mounting the sensor unit, do not twist the harness of the sensor
connector.
When closing the casing cover, make sure that the power supply cord, harness, or O-ring
is not caught by the casing cover.
MEMO
