Crowcon Gas-Pro - Confidence Tone

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2.9.2.4 Condence Tone
The Tank Check Mode condence tone is different to other operational modes to give an audible
indication of the operating mode.
The Tank Check Mode condence tone is four short ‘pips’ which are low pitch while in LEL range,
and high pitch in VOL range.
2.9.2.5 Display Backlight
The display backlight is always illuminated in Tank Check mode.
Note: Whilst operating in Tank Check mode the toxic sensors may respond to high levels of %VOL
ammable gas and indicate a reading on the display.
The toxic sensors may indicate a reading, or an under range indication, whilst high levels of %
VOL ammable gas are exposed to the device.
If the device is then removed from exposure to high levels of %VOL ammable gas, the toxic
sensors may continue to indicate a reading for a number of minutes.
When the Tank Check operation is complete it is important that the device is placed in clean
air for several minutes until the toxic sensor readings have returned to zero levels, before it is
then used as a personal protection device.
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