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AMC-210 Transmitter with external electrochemical sensor
6 PREVENTIVE MAINTENANCE
6.1 GENERAL
The sensor/transmitter unit should be brushed or wiped clean of any dust or dirt at least once a
year or more, depending on the rate of accumulation.
To avoid sensor damage, the unit MUST NOT be submerged in any liquids. Any hosing or
splashing of the unit with any liquids must also be avoided.
6.2 VERIFICATION OF OPERATION
To verify the operation of the sensor/transmitter unit, perform a test to ensure that it is still
responding to gas. This test should be performed every 6 months. For more demanding
applications, verification should be performed on a monthly basis.
6.3 SENSOR REPLACEMENT
Caution:
Turn off the power supply before attempting the following.
Expected sensor life is as indicated in Section 3.1.1. The signal from the sensor will be greatly
reduced when its replacement is required. The sensor should be replaced when it no longer
responds to the presence of gas or has an unstable zero signal.
When the sensor needs replacing, reorder the "Sensor Part Number" listed in the Product
Information (section 2).
together. This is done to provide rapid stabilization of the sensor signal after installation. To
wire the sensor for correct operation, first separate (cut apart) the shorted leads, if any, then
connect the RED lead to the "R" terminal, then BLACK to "S" and the YELLOW to "C" of the
sensor terminal block on the transmitter. See Figure 7 for the sensor replacement and wiring
procedure.
Note:
Allow 10 minutes for the new sensor to stabilize before recalibration, and then follow
the instructions in calibration (section 5.2) of this manual.
When sensors are shipped, some sensor leads may be shorted
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