How to calibrate gas detectors?
How to calibrate the gas detector, this is also a question of many users? The core part of the gas detector is the gas sensor. The gas sensor belongs to the 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 is determined by the principle of the sensor. Of course, external factors such as the environment, gas concentration at the detection site, temperature and humidity will also have an impact. Under normal circumstances, the time used 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 a long time, it is prone to drift. At this time, we need to recalibrate the gas detector. Generally, gas detectors are calibrated once a year, and if they are strict, they will be calibrated every six months or every 3 months. The more times of calibration, the less likely the detector will drift, and the better the detection effect.
Shenbei Scientific Instruments tells you how gas detectors are calibrated.
When calibrating gas detectors, standard gas is generally used for calibration.
Taking methane as an example, the things that should be prepared for the calibration equipment are:
1. Buy methane cylinders, pressure reducing valves, flow meters, with 50% methane LEL standard gas, 2 liters or 4 liters;
2. Buy a hose, one end is connected to the gas outlet of the gas meter, and the other end is connected to the standard gas hood
.
Operation process:
1. Cover the gas cup of the gas detector with the standard gas cover first.
2. Open the cylinder pressure valve and adjust the flow rate of the flow meter to 0.5L/min.
3. After ventilation for about 30S, see the real-time concentration value of the detector. If there is a deviation, set the gas span to 50.0, then press the Enter key to confirm.
4. When OK is displayed, the calibration is completed.
