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SERIES 3000 MKII TECHNICAL MANUAL
S3KMKIIMAN_MAN0878_Issue 6_01/2014
14.2 Detector operational life
Typical life of a toxic gas sensor is dependant on the application, frequency and amount of gas exposure.
Under normal conditions (3 monthly visual inspection and 6 monthly test/re-calibration) the toxic sensor has
an expected life equal to or greater than the lifetime as listed below:
18 months for chlorine and chlorine dioxide sensors.
12 months for ammonia, hydrogen chloride, and hydrogen fluoride sensors
(see ammonia note below).
24 months for oxygen and other toxic sensors.
Refer to section 15 for sensor replacement procedures.
Caution: Oxygen deficient atmospheres (less than 6%V/V) may result in
inaccuracy of reading and performance.
Note: Ammonia electrochemical cells are reliable and suitable for applications where no background
concentration of ammonia exists. Under these conditions the cells are expected to operate for 12 to
24 months.
These ammonia cells are of the consumptive type. Their operating life can be adversely affected by
continuous or excessive exposure to ammonia, or by prolonged exposure to high temperatures and
moisture.
To ensure continued detection availability it is recommended that the detectors are regularly bump
tested and a relevant cell replacement program be implemented.
