No.4 – Bump test gas detector GasAlertMax XT II


Following the following example highlights the importance of Bump testing:

James works at a local refinery and arrives in the morning to do his daily work. He wears all the necessary safety equipment to enter the working position. His job for that day was to clean the location around the construction park with a hydraulic nozzle. At the end of his shift, he returned to the locker room to clean up. He cleans his kit using common detergents containing alcohol and silicones.

The next day, he arrives and receives equipment before being introduced to his work during the day. Then when he was working in an area close to the ground, when he smelled something like a rotten egg smell, but the smell quickly passed, and since his gas alarm did not respond, he continued to work. Shortly afterwards, he suddenly collapsed because the concentration of Hydrogen sulfide (H2S) had gone too high.

James’ first mistake was to clean the gas detector with products containing alcohol and silicone. Sensors can be poisoned or inhibited with these cleaning substances. Alcohol can damage electrolysymical sensors and silicone products will prevent them from working anymore when these gas-homage sensors are used to measure hydrocarbons such as methane, pentan and propane.

In both of the above cases, the circuit is still working – and therefore the device will give normal results – without any additional checks James will think it works normally. However, this device will not raise the alarm if it encounters too high a gas concentration. The risk can be avoided by performing bump tests.

No.4 – Bump test gas detector GasAlertMax XT II [EN: How to Bump test?]

Written by TES Industry

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