GasSens Gas Detection System Section 5 - A11-10 Br
2
Sensor/Transmitter
O & M Manual
Revision E, 10/15 5 - 8
SENSOR REPLACEMENT
Electrochemical sensors used in the A11 are warranted for 12 months and generally last 18-24
months or more. When sensor replacement is required, it can be done easily and quickly. Open the
transmitter and unplug the sensor cable from the transmitter circuit board. Unscrew the sensor from the nut
on the inside of the enclosure and screw in the replacement sensor. For explosion-proof transmitters, there
is no nut, since the stainless steel sensor housing threads directly into the enclosure.
Connect the new sensor to the pins on the transmitter board and replace the transmitter cover.
After a new sensor has been connected, allow 12 hours for the new sensor to completely stabilize. Then
perform a zero and span as described on pages 4 and 5.
GENERATOR REPLACEMENT
Auto-Test gas generators are warranted for 12 months and will generally last for 24 months or
more. To replace, disconnect the generator leads from the terminal block marked TB2 on Figure 5-2.
Loosen the cable gland, pull the wires out of the enclosure, and unscrew the generator from the sensor.
Reverse the process to install the new generator. Observe the wiring polarity when installing the new
generator.
Once installed, the new generator should be tested by running the Manual Auto-Test procedure
described in the Receiver section. If no sensor response is observed, recheck the generator connection to be
sure the polarity is correct. If the sensor still does not respond, test the sensor with the Sensor Response
Test described on page 4. If the sensor does not respond, replace it. If the sensor responds properly,
contact ATI for assistance with the generator.
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