ATI Technologies A12-17, Руководство по эксплуатации и обслуживанию

Страница: 29 / 32

A 12-17 Combustible Gas Transmitter
O & M Manual
Rev-H, 7/15
- 29 -
SENSOR REPLACEMENT
Combustible gas sensors used in the A12-17 are warranted for 12 months and generally last 2 years
or more in the absence of poisoning agents. When sensor replacement is required, it can be done easily
and quickly. Power down transmitter in accordance with all applicable safety standards and procedures.
Open the transmitter enclosure and unplug the transmitter electronics module. Disconnect the 3 or 5
sensor wires from the octal base and unscrew the sensor from the explosion-proof transmitter housing.
Screw in the replacement sensor and reconnect at the octal base. After a new sensor has been
connected, allow 4 hours for the new sensor to completely stabilize. Then perform a zero and span
calibration as described on pages 21 through 22.
Sensor assemblies equipped with Auto-Test gas generators can have new generators installed at the
factory. If the generator should fail and the sensor still show good response, contact ATI and arrange for
generator replacement. The sensor in this type of assembly cannot be replaced separately.