If all channels are successfully calibrated the instrument will display the message
'Calibration successful', otherwise the message 'Calibration failed!' with the list
of gases that failed the calibration displayed.
4.4 Pellistor Saving
To avoid the flammable sensor being damaged by exposure to excessive levels
of flammable gas, it is protected automatically. Pellistor saving may be triggered
in two ways: On dual range flammable instruments (i.e. those with a pellistor
sensor measuring LEL and a thermal conductivity block measuring % volume)
a percentage volume of gas may be specified at which the pellistor will be
switched off. This percentage is configurable by computer using the SetPortable
software, and is 5% by default.
Additionally, a flammable sensor will switch itself off if it reaches a reading of
105% LEL or more
– this action will happen irrespective of whether a % volume sensor is also fit-
ted. If a flammable sensor switches itself off then it will stay off until it is manu-
ally switched on. This happens by pressing the UNMARKED button. The sensor
will warm up for 5 seconds before the flammable channel will read.
Pellistor saving is indicated on the display by the gas level being blank for the
flammable block.
Detective+ Pellistor saving
When performing a calibration with a gas from a pressurised source, the
instrument’s pump (if present) should always be turned off.
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