What characteristics should I pay attention to when choosing a gas detector?
1. Reliability
The longer the lifespan of the sensor, the better. Generally speaking, the lifespan of the sensor is at least 2 years, while that of the combustible gas sensor is 2-5 years. The longer the average error time, the better. What are the accuracy and precision, and the smaller the error value, the better. The product warranty period is generally 2 years.
2. Applicability
Professional personnel from the enterprise and experienced on-site supervisors or employees should identify and evaluate the hazardous gases at the confined space operation site to determine whether the selected detector's sensor meets the usage requirements.
3. Stability
What are the values of zero offset and full range offset, the smaller the better.
How does interference gas affect? All sensors, except for oxygen gas detectors, will react with other gases of varying degrees. Electrochemical sensors that detect hydrogen sulfide are commonly used, so users must be as familiar as possible with the gases that may exist in limited spaces. For direct reading instruments, interference from interfering substances is a difficult problem to overcome. Therefore, in any case, if the interference situation of direct reading instruments has not been evaluated, it is not recommended to use direct reading instruments, nor should they replace sampling and analysis methods.
4. Convenience
Lightweight, small in size, easy and comfortable to wear, easy to maintain and repair.
5. Calibration requirements
Correction method, duration, and ease of use. There are two calibration methods - laboratory calibration and on-site calibration. On site calibration involves exhaling the oxygen sensor, and the instrument's oxygen reading must decrease and an alarm must be triggered.
6. Recognizability
Numerical or pointer type gas detector. Generally speaking, numerical models have the advantages of easy readability and fewer false positives. Is the display area large enough with background lighting and large fonts for easy reading and understanding.
Is the alarm sound loud enough to distinguish it from background noise. Generally applicable with an efficiency of 90dB (A) or above. Can the flashing alarm light be identified from various angles. Can the signal be continuously displayed as the gas concentration changes, and the alarm will be stopped only after confirmation or countermeasures are taken.
7. Protection requirements
Whether the explosion-proof safety level is applicable to the workplace, whether the intrinsic safety has been certified, whether there is explosion-proof certification or only intrinsic safety design. Anti electromagnetic wave level. Because electromagnetic waves can generate induced currents, causing errors or instability in instrument readings, the sources of electromagnetic waves are generally electronic products that emit electromagnetic waves, such as walkie talkies, radio broadcasts, and mobile phones
