Operating instructions

AMC-210 Transmitter with external electrochemical sensor

5 PREVENTIVE MAINTENANCE

5.1 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.

5.2 SCHEDULED CALIBRATION

Scheduled calibration is critical in maintaining proper function of gas sensor/transmitters.

It is recommended that the sensor/transmitter be calibrated a minimum of twice a year. For

highly demanding applications, more frequent verification is recommended.

As mentioned, Armstrong Monitoring offers a number of different maintenance plans to suit your

requirements see section 4.2.

5.3 SENSOR REPLACEMENT

Caution:

Turn off the power supply before attempting the following.

When its signal is greatly reduced or unstable, the sensor/transmitter replacement is required;

see section 2.1 for replacement sensor P/N.

When sensors are shipped, some sensor leads may be shorted 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 performing the calibration

procedure in section 4.2.2.