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iTrans Fixed Point Single/Dual Gas Monitor Maintenance
(P/N: 77023554) iTrans User Manual 7-1
M
AINTENANCE
Chapter
7
7.1. 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 sensor carries a 5-year warranty
with an anticipated life of 7 or more 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, 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.