GASMAX II Operation & Maintenance Manual, Revision 7.0
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6
MAINTENANCE
NORMAL MAINTENANCE
Normal maintenance for the GASMAX II primarily involves periodic inspection of the unit followed by
calibration. GDS Corp recommends calibration at least every three to six months, or more often if
temperature extremes, vibration, the presence of incompatible gases or other environmental factors may
accelerate the deterioration of the sensor element. Calibration is an ideal time to inspect the unit for
clogged or wet sensor heads, cracked or damaged enclosures and water incursion inside conduit or
junction boxes.
SENSOR REPLACEMENT
If a local toxic sensor shows FAULT, does not respond to gas or can no longer be calibrated, it should be
replaced. If a remote direct toxic sensor shows FAULT, does not respond to gas or can no longer be
calibrated, before replacing the sensor check the wiring between the sensor and GASMAX II for electrical
continuity. In addition, check for signs of moisture or corrosion in any of the cabling or junction boxes.
To physically replace a GASMAX sensor, perform the following steps:
1.
Declassify the area or remove power to the GASMAX II.
2.
Unscrew the sensor head cover. If unable to open the cover by hand, use a Sensor Head Replacement
Tool (p/n 10-0187).
3.
Remove the old sensor by pulling straight down. DO NOT TRY TO UNSCREW THE SENSOR!
4.
Carefully install the replacement sensor by aligning the arrow on the sensor with the arrow engraved
on the sensor head. Push straight up until the sensor connector seats firmly into the sensor
connector.
5.
Reinstall the sensor head cover by CAREFULLY screwing the cover onto the sensor head.
Figure 6-1: GASMAX SENSOR REPLACEMENT
NOTE:
IF THE SENSOR FALLS OUT OF THE SOCKET DURING REINSTALLATION, REPLACING THE SENSOR
HEAD CAN DESTROY THE SENSOR AND SENSOR HEAD.
USE CAUTION WHEN REINSTALLING THE COVER.
