Why do a Bump Test?


All sensors have a life span and at some time will fail. Some will fail suddenly and some will fail over a longer period. Bump testing alerts the user of non-functioning sensors. This failed condition could be a loss of sensitivity, a loss of response time or both that could be caused from various factors. One of these is gases or vapours being able to reach the sensor. Bump testing will alert the user if a gas inlet has become blocked, even if the blockage is not visible to the human eye.

What does it mean if a cell is described as blind?

It quite simply means that the cell is no longer able to have gases or vapours enter so that the cell can give a reading.

How long should a bump test take?

Bump tests are dependent upon the model and manufacturer, but can take as little as 15 seconds up to around 3 minutes.

Failed Bump on 3 or more sensors.

If you bump test your unit and all 3 or more sensors fail bump due to slow response times this is quite often that the filters are blocked, although some sensors may not be working correctly either. In the first instance change all of the sensor filters and re-bump, if this now results in a pass then the problem has been sorted.

If the bump test still fails return it to an authorised service centre.

Starting a bump test Bump test passed Gas Detector ready to use
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