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MAN-MAXPRO
REV. B.0.
5. CALIBRATION
5.1
It is important to verify accuracy on a regular basis to guard
against any unexpected loss of sensitivity due to mechanical
damage, immersion, aging, or exposure of the sensors to
poison (such as high concentration of combustible gas, tetra-
ethel-lead, sulfides or silicone containing lubricants) present in
the atmosphere being monitored.
The safest possible course of action is to expose the sensors
to a known concentration test gas before each day's use. This
"bump" test takes only a few seconds to accomplish. It is not
necessary to make a calibration adjustment unless readings
are off by more than 15% of the applied gas concentration. If
this procedure is followed, the calibration interval can be up to
90 days.
If your calibration procedures do not permit daily checking of
the sensors, Lumidor recommends the following procedure to
establish a safe and prudent check schedule. Initially, over a
period of a few days, check the response daily to be sure there
is nothing in your atmosphere that is poisoning the sensors. If
the instrument displays correct concentration levels after 2
weeks on this schedule, the calibration interval may be
extended to two weeks. If the instrument does not require
calibration, after 2 months on this schedule, the calibration
interval may be extended to 30 days.
Always observe your employer's calibration and testing
schedules.
5. CALIBRATION
CALIBRATION FREQUENCY
This does not preclude testing with gas on a regular basis.
WARNING
25
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