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Crowcon Blog #1: Why We Have to Calibration a Gas detector?

Why do we have to adjust the gas detector? I talked about Bump testing for your device, so naturally we now mention the importance of correction.

There are two main reasons for calibration. Firstly, gas detection machines often operate in harsh environments: high and low temperatures / or high humidity; They can be exposed to contaminants, such as solvents, silicone etc.; Exposure to gas; As well as the service life of a sensor; Any one of those reasons can result in the detector reacting to a specific gas concentration changing, for example the detector can read 46% LEL when the real level is 50% LEL.

Secondly, most managers, safety managers and users require some records that their equipment has been calibration and will do a good job they want it to do (i.e. react to gas). As well as calibration of the sensor for accurate response, the device will have a calibration date installed on the device, so that you can see when and when calibration is performed, as well as receive a calibration certificate as a record.

Why do we need gas detector calibration?
Why do we need gas detector calibration?

Bump testing vs. calibration

The difference between bump testing and calibration is that bump testing is only in short contact with gas to verify the reaction sensors within a specific boundary and the alarm machine is correct.

Calibration is a “reset” of the detector’s reaction to a known gas concentration, in the balance of synthetic gases or nitrogen. This will determine the accuracy between the reading of the detector and the actual concentration of the relevant gas composition. The adjustment involves modifying the reactions of the device, which in which the values are consistent with the gas supply.

Perform calibration.

With gas detector calibration, it is important to control the proper calibration performance of the process, considering the flow and flow rate, pressure, temperature, humidity, used gas, cross sensitivity, reaction time of the sensors and the emission of gases , As well as any additional requirements in point by the manufacturer. Calibration is usually divided into two steps. In the first step, the device is zero in a clean air environment, synthetic gas or nitrogen is made in the back, so that the readable values are equal to what is known in the clean air environment. The second step is to insert the calibration gas into the device, the calibration gas containing the gas concentration that the sensor is designed to measure and correct any deviations with correct reading. In addition, you can cross-calibration, where you use a different gas and use the cross calibration element to provide the reaction to the gas you need.

How should you adjust the air detector?

The frequency with which the device is calibration is possible varies, although you should combine information from the device and the environment, as well as users, manufacturers and service providers. A risk assessment is required to confirm the correct correction time. And remember, in between calibration stages, Bump tests regularly.


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