What characteristics should be paid attention to when choosing a gas detector?
1. Reliability
The longer the life of the sensor, the better. Generally speaking, the life of the sensor is at least 2 years, and the life of the flammable gas sensor is 2 to 5 years. The longer the mean time to error, the better. What is the accuracy and precision, the smaller the error value, the better. The product warranty period is generally 2 years.
2. Applicability
Enterprise professionals and experienced job supervisors or employees should identify and evaluate the hazardous gases in the limited space operation site to determine whether the sensor of the selected detector meets the use requirements.
3. Stability
What is the value of zero offset and full scale offset, the smaller the better.
What is the effect of interfering gases? All sensors except oxygen gas detectors will have large or small reactions to other gases. What often happens is the electrochemical sensor that detects hydrogen sulfide, so users must be familiar with the limited space as much as possible. gases that may be present. For direct-reading instruments, the interference of interfering objects is even more difficult to overcome. Therefore, no matter what the situation, if the interference of direct-reading instruments has not been evaluated, it is not recommended to use direct-reading instruments, and it is not suitable to use direct-reading instruments. The instrument replaces the sampling analysis method.
4. Convenience
Light weight, small size, easy and comfortable to wear, easy maintenance.
5. Correction requirements
Correction method, duration, and ease. There are two calibration methods - laboratory and on-site calibration. On-site calibration is to exhale the oxygen sensor. The oxygen reading value of the instrument must drop and an alarm will occur.
6. Legibility
Numeric or pointer gas detector. Generally speaking, the numerical type has the advantages of easy readability and less misjudgment. Is the display area large enough with backlighting and large fonts for easy reading and comprehension.
Whether the siren is loud enough to be distinguished from the background noise. Generally, the efficiency above 90dB(A) is applicable. Whether the warning flashing light can be recognized from various angles. Can the signal be displayed continuously with the change of the measured gas concentration, and the alarm will be stopped after confirmation or countermeasures are taken.
7. Protection requirements
Whether the explosion-proof safety level is suitable for the workplace, whether the intrinsic safety is certified, whether there is an explosion-proof certification or only has an intrinsically safe design. Anti-electromagnetic wave level. Because electromagnetic waves will generate induced currents and cause errors or instability in instrument readings, the sources of electromagnetic waves are generally radio walkie-talkies, radio broadcasts, mobile phones and other electronic products that emit electromagnetic waves.
