How to calibrate the gas detector?
How to calibrate the gas detector is also a question for many users? The core part of the gas detector is the gas sensor. Gas sensors belong to original components and cannot be used directly. It needs to be completed through secondary development, sampling, comparison, filtering, temperature and humidity compensation, signal amplification, etc., before it can be directly powered on and used.
The life of the gas detector depends on the principle of the sensor. Of course, external factors such as the environment, the gas concentration at the detection site, temperature and humidity will also have an impact. Under normal circumstances, the use time is generally 2-3 years, or even longer.
The key part of the gas detector is the gas sensor. If the gas detector is used continuously for too long, it is prone to drift and so on. At this time, we need to recalibrate the gas detector. Generally, the gas detector is calibrated once a year, and the detection instrument is strictly calibrated every six months or every 3 months. The more times of calibration, the less likely the detector is to drift, and the better the detection effect is.
Shenbei Scientific Instruments tells you how the gas detector is calibrated.
When the gas detector is calibrated, it is generally calibrated with standard gas.
Taking methane as an example, the things that should be prepared for the calibration equipment are:
1. Buy a methane cylinder, a pressure reducing valve, and a flow meter, equipped with methane 50% LEL standard gas, 2 liters or 4 liters;
2. Buy a flexible hose, connect one end to the air outlet of the gas meter and the other end to the standard gas cover
.
Operation process:
1. Put the standard gas cover on the gas cup of the gas detector.
2. Open the cylinder pressure valve and adjust the flow meter to a flow rate of 0.5L/min.
3. After ventilating for about 30 seconds, check the real-time concentration value of the detector. If there is a deviation, set the gas range to 50.0, and then press the Enter key to confirm.
4. When OK is displayed, the calibration is completed.
