Mobile gas detectors are used for continuous measurement. They are an essential companion for everyday use. Testing their function is therefore especially important.
We refer to daily bump testing but it should be noted, visual inspection and function testing should be performed prior to each use. Furthermore, bump testing should be performed after exceptional situations (device was dropped) or when there is a risk that the device is damaged (sensor poisoning).
Why should you test?
Testing an instrument using a known gas concentration (also known as a function or bump test) is the only way to guarantee reliable and correct measurement of and warning against gas hazards.
This test is important to verify whether the gas to be measured can flow through the dust and water filter to the sensor, to check that the sensor is properly calibrated, and to test that alarms are working and are set correctly.
The importance of performing a daily bump test can not be stressed enough but carrying out prescribed calibrations is at least equally as important, even if calibrations occur less frequently.
Calibration should be performed regularly, because environmental factors or ageing can cause changes to sensor sensitivity. Recommendations for calibration intervals can be found in the technical documentation for the device in question, or in national regulations.
Simple, quick bump tests can uncover potential malfunctions and significantly increase the safety of your employees.
Quick and extended bump test
The following comparison shows the differences between the two test methods. An extended bump test offers a greater degree of safety.
Quick bump test
Extended bump test
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This article was adapted from content provided by Dräger