PureAire Monitoring Systems, Inc.
10/25/07
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4.8 Routine Maintenance Schedule
Continuous gas detection systems depended upon to measure and detect
hazardous gas leaks in the workplace require periodic maintenance to ensure
proper operation. The frequency with which this routine maintenance is required
depends on the environment, since temperature, humidity, gas concentrations,
and dust all affect system operation.
The following tables are intended to serve as general guidelines for routine
maintenance. The conditions in your particular application, as well as your
organization’s maintenance policies, will ultimately determine the best routine
maintenance schedule for your equipment.
4.8.1 Routine Visual Checks
Item
Status With No Gas Present
Local Display
Display shou
ld read “0.0” (“0” for LEL gases)
Fault Keypad LED
Should not be illuminated
4-20 mA Output
Output should be 4 mA
Gas Concentration
Alarm Relays (optional)
De-energized
System Fault Relay
(optional)
Energized
4.8.2 Recommended Routine Maintenance Schedule
Routine Visual Checks
Monthly
Sensor Calibration
Every 6 months
