Preventive Maintenance; General; Verification Of Operation; Sensor Replacement - AMC 350 Instructions Manual

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6 PREVENTIVE MAINTENANCE

The sensor/transmitter unit should be brushed or wiped clean once a year or more, of any dust

or dirt, which settles on it, depending on the accumulation.

The unit SHOULD NOT be submerged in water or other liquids.

conditions that could cause a liquid to enter the enclosure should be avoided.

To verify the operation of the sensor/transmitter unit, make sure that is still responding to gas.

This test should be performed every six (6) months, but for more demanding applications,

verification should be performed on a monthly basis.

Caution:

Turn off the main power supply before attempting the following.

Sensor life is in excess of 10 years. When the sensor needs replacing, reorder the Sensor Part

Number listed in Product Information (section 2.1). The sensor should be replaced under the

following conditions (see FIGURE 7 for sensor replacement procedure):

1. When the sensor element becomes an open circuit, the transmitter outputs a fixed 1 mA

+/- 0.10 mA signal.

2. When the sensor no longer responds to the presence of gas or has an unstable zero

signal.

Note:

Allow 10 minutes for new sensor element to stabilize (burn-in) before recalibration, and

then follow instructions in calibration section 5.2 of this manual.

AMC-350 Sensor/Transmitter

Also, hosing and other

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