Calibration (Cal) - Crowcon IR Display Instructions D'installation, D'utilisation Et De Maintenance

Controlling the IRmax Controlling the IRmax

9.4 Calibration (CAL)

During calibration, the IRmax is exposed to gas at a known concentration. The output
reading is set at the correct level, so that subsequent readings will represent an accurate
measurement of the gas present in the air surrounding it.
To start the process, select 'CAL' as described in the table shown on page 16. Then press
'Enter'.
The next screen will show the default calibration set-point (e.g. 50% LEL).
To change the setting of the gas calibration set point (i.e. to suit the calibration gas being
used), use the 'Up' and 'Down' keys. As soon as one of these is pressed, the display will
stop flashing and show only the value. Alter the value as required.
When the correct level is displayed, press 'Enter'.
Preparing for the calibration, IRmax will go into 'inhibit mode' *, so the calibration gas
does not trigger an alarm. The output from IRmax will be zero unless a different level of
the 'operational inhibit' has been set on IRmax.
Apply calibration gas to the detector as described in Section 3.1 of the main manual.
When the gas reading levels off, click on the 'Enter' key to proceed with the calibration.
To exit from the process at this point, double click on the 'Enter' key.
During calibration the screen below will be displayed.
When the calibration is complete, the display will indicate the result of the calibration.
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