1. Reliability
The longer the sensor life of the gas detector, the better. Generally speaking, the sensor life is generally 2-3 years, and the combustible gas sensor is 3 years. The longer the average error time, the better. What is the accuracy and precision, the smaller the error value, the better. The product warranty period is generally 1 year.
2. Correction requirements
Calibration method, duration, and ease of use. There are two calibration methods - laboratory and field calibration. Field calibration is to exhale the oxygen sensor, the oxygen reading of the instrument must drop and an alarm occurs.
3. Stability
What is the value of the zero offset and full amplitude offset of the detector, the smaller the better.
4. Applicability
Enterprise professionals and on-site experienced operation 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 needs of use.
5. Convenience
Light weight, small size, easy and comfortable wearing, easy maintenance.
6. Ease of identification
Numerical or pointer gas detectors. Generally speaking, the numerical type has the advantages of easy readability and less misjudgment. Whether the display area is large enough, with background lighting and large fonts, for easy reading and understanding. Whether the siren is loud enough to distinguish it from background noise. Generally, it is applicable to the effect of 90dB(A) or above. Whether the warning flashing light can be recognized from various angles. Whether the signal can be continuously displayed with the change of the measured gas concentration, and the alarm will be stopped after confirmation or countermeasures are taken.
7. According to the measurement object and measurement environment
Determine the type of sensor according to the measurement object and measurement environment. To carry out a specific measurement work, we must first consider which principle sensor is used, which can only be determined after analyzing various factors.
8. Response characteristics (reaction time)
The frequency response characteristics of the sensor determine the frequency range to be measured, and the measurement conditions must be maintained without distortion within the allowable frequency range. In fact, the response of the sensor always has a certain delay, and it is hoped that the shorter the delay time, the better.
9. Linear range
The linear range of a sensor is the range in which the output is proportional to the input. Theoretically, within this range, the sensitivity remains constant. The wider the linear range of the sensor, the larger its range, and can guarantee a certain measurement accuracy.
