ACM 200 Series User Manual

AMC-200 Transmitter
10
6 PREVENTIVE MAINTENANCE
6.1 GENERAL
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. Also, hosing and other
conditions that could cause a liquid to enter the transmitter or sensor should be avoided.
6.2 SENSOR REPLACEMENT
Sensor life is typically 2 to 5 years. The sensor should be replaced under the following
conditions:
1. When the sensor element fails and becomes an open circuit, the transmitter outputs a
fixed 1 mA signal.
2. When the sensor no longer responds to the presence of gas or produces an unstable
“zero” signal.
When the sensor needs replacing, reorder the “Sensor Part Number” listed in section 2.1,
Transmitter. See FIGURE 6 for sensor replacement and wiring procedure.
Note:
Allow 24 hours for the new sensor element to stabilize (burn-in) before recalibration, then
follow instructions in the transmitter calibration section 5.2.2 of this manual.

ACM 200 Series Specifications

General

Output	4-20 mA, HART
Accuracy	±0.1% of span
Operating Temperature	-40 to 85°C
Input	4-20 mA
Frequency Range	Not applicable
Output Power	Not applicable
Modulation	Not applicable