Factors affecting the accuracy of gas detector
As the name implies, the gas detector is an instrument used to detect the concentration of the leaked gas. Its core component is the sensor, because the gas detector USES the sensor to detect the type and concentration of the leaked gas. Therefore, if the sensor fails, the gas detector cannot detect it. So what are the factors that affect the gas detector reading?
The three major factors
In general, many environmental factors can affect the readings of the gas detector sensor. These include changes in pressure, humidity and temperature. Changes in pressure and humidity can affect the amount of oxygen actually present in the atmosphere.
If there is a significant change in humidity (as when moving from a dry, air-conditioned environment into a humid, outdoor environment), the water vapor in the air will drive away oxygen, causing an oxygen reading that may cause a drop of up to 0.5%. The gas detector sensor is equipped with a special filter to eliminate the influence of humidity changes on gas readings. The effect is not immediately apparent, but over the course of several hours can slowly affect the oxygen level.
If the pressure changes dramatically (as when passing through a gas plug), there may be temporary fluctuations in the readings of the gas detector's sensor, which may cause the detector to sound an alarm. When the percentage of oxygen volume is stable at about 20.8% and the overall pressure drops significantly, oxygen for breathing in the environment may become dangerous.
Sensor with temperature compensation. However, if the temperature fluctuates sharply, the gas detector's sensor readings may drift. Zero instruments should be calibrated on the job site to minimize the impact of temperature changes on readings.