Chapter 7 | Maintenance
Introduction
Sensors have a variable life dependent on the sensor and the environment
in which they operate. Oxygen sensor life is about 2 years and toxic gas
sensor life is normally 2 years or greater. The catalytic combustible gas
sensors normally operate in excess of 3 years, while the infrared sensors
have a MTBF greater than 5 years.
Sensors have baseline drift and their characteristics change with time. Thus,
the must be calibrated on a regular basis. Gas detection instruments
are potential life-saving devices. In recognition of this fact, calibration for
the toxic and catalytic LEL sensors should be at least at quarterly intervals,
while the Infrared sensor should be calibrated on an annual basis with
functional tests every 6 months.
Further, Industrial Scientific - Oldham recommends prudent testing and/or
calibration after a gas alarm. All calibration/service to the sensors should be
recorded and accessible.
NOTE: Other than regular calibrations, the require no other routine
maintenance.
NOTE: Take special care with handling and storing sensors. They are
delicate and can be damaged by storage in environments outside the
specified temperature, pressure, and humidity limits.
NOTE: Sensors are susceptible to damage from high pressure or low
pressure, especially if the change is sudden. Also, sensors should not be
operated at pressures that are 10% above or below atmospheric pressure.
NOTE: If sensors and the surrounding environment must be washed down
at any time, cover the opening of the sensor housing to protect it from water
or excess moisture. Remove cover when wash down is complete. An
optional splashguard is available for continuous protection.
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