In different production situations and detection requirements, choosing the appropriate gas detector is an important foundation. When selecting a suitable gas detector, generally follow the following principles.
1. Determine the types of gases that need to be detected in the detection environment.
When choosing a gas detector, you must consider the type of gas that needs to be detected, so you choose a gas detector that detects the corresponding gas.
2. Determine the usage occasion of the gas detector.
Different industrial environments require different types of gas detectors. If this type of instrument is used as a safety alarm in an open place, such as an open workshop, you can use a body-worn diffusion gas detector because it can detect continuously and in real time. Provide specific guidance on worker health and safety.
If you enter a confined space, such as a reaction tank, storage tank or container, sewer or other underground pipeline, underground facility, agricultural closed granary, railway tanker and shipping cargo hold. and testing must be conducted outside a confined space. At this time, it is necessary to choose a multi-gas detector with a built-in sampling pump.
3.How to calibrate a gas detector
Many gas detectors now have replaceable detection sensors, but this does not mean that a detector can replace its sensor at any time. Whenever a sensor is replaced, in addition to necessary sensor aging, the instrument must also be calibrated. Corresponding standard gases need to be used during calibration.
The calibration method for combustible gas alarms and toxic gas alarms is the same. First, use a zero gas (usually clean air or a standard gas that does not contain the gas to be measured) and a standard gas of a certain concentration to calibrate the instrument. The calibration curve is obtained and stored in among the instruments. During measurement, the instrument converts the gas to be measured into an electrical signal, which is then calculated and converted into an actual concentration value. Therefore, it is essential to zero the instrument at any time and calibrate the instrument regularly.
It is recommended that before using the gas detector, the instrument should be tested for response to the standard gas to ensure that the instrument truly plays a protective role.