In industrial production and specific working environments, limited space operations often hide a variety of potential hazards, including the accumulation of toxic and hazardous gases. In order to ensure the safety of workers, it is very important to use a gas detector to monitor the gas composition in a limited space in real time. The performance index of the gas detector in limited space determines the accuracy and reliability of its detection. The following are the main performance indicators of the tester:

1. Detection principle: Gas detectors are divided into catalytic combustion type, electrochemical type, infrared type, semiconductor type, etc. according to different detection principles. Each principle has its own specific detection gas and application.
 
2, detection range: refers to the instrument can detect the gas concentration range, including low detection limit (LDL) and the highest detection limit (UDL). The detector shall be able to cover a range of concentrations from safe thresholds to potentially life-threatening levels.
 
Response time: refers to the time required for the gas detector to reach the specified reading after contacting the target gas. Rapid response helps to identify hazards and take countermeasures in a timely manner.
 
4. Stability: Good stability means that the instrument can provide consistent test results over a period of time without significant deviations due to environmental changes or time.
 
Selectivity: The gas detector should have high selectivity for specific gases to avoid interference from other gases and ensure the accuracy of the test results.
 
Repeatability refers to the consistency of instrument readings when measuring the same gas concentration multiple times under the same conditions.
 
Zero drift and range drift: These two indicators reflect the stability of the instrument calibration. Zero drift refers to the change of instrument reading in the absence of gas; span drift refers to the change of instrument reading in the whole detection range.
 
Anti-interference: In a complex environment, the gas detector should be able to resist interference from other gases or environmental factors (such as temperature and humidity).
 
9, alarm function: gas detector is usually equipped with visual and sound alarm, when the gas concentration reaches the preset alarm threshold, it can remind the operator in time.
 
10. Ease of use and portability: Considering the characteristics of limited space operation, the gas detector should be designed to be portable and easy to operate.
 
11, durability and reliability: the detector should have enough durability to adapt to the harsh working environment, and can work stably for a long time.
 
12. Certification and standards: Gas detectors should comply with national or international safety certification and standards, such as ATEX, IECEx, UL, etc.
 
In summary, the key performance indicators of a gas detector in a limited space are multifaceted, and they together determine the accuracy, reliability and practicality of the detector. When selecting a gas detector, the above indicators should be comprehensively considered according to the specific application requirements and environmental conditions, and the appropriate equipment should be selected to ensure the safety of the operation.