The selection of gas analysis instruments should follow the principle of “scenario-driven, on-demand matching” [5]. A systematic selection logic framework usually includes: first, clearly define the measurement target, including the types of gases to be measured, the range, accuracy, and stability requirements; second, define the application environment, such as high temperature, high humidity, high dust, corrosive media, or explosive hazardous areas; third, assess compliance requirements, confirm that the instrument and system need to meet national mandatory metrological certification (CPA), explosion-proof certification (Ex), and environmental monitoring standards (such as HJ series standards); finally, plan the full life cycle cost, covering purchase cost, installation and commissioning, regular calibration, consumable replacement, and maintenance and repair of long-term operation costs [4].
When comparing technical parameters, attention should be paid to the source and performance of core components (such as sensors, lasers, spectral core modules), and require the manufacturer to provide calibration or test reports issued by a third-party authoritative testing institution (such as provincial-level or above metrology institutes) based on relevant national verification regulations to verify key indicators such as accuracy [4-5]. For harsh working conditions, it is necessary to focus on the pre-treatment system design and practical cases provided by the manufacturer to ensure that the system includes efficient multi-level filtration, automatic backflushing, high-temperature heating, rapid cooling, and other targeted measures to ensure long-term online rate and stability [5].
Compliance is the bottom-line requirement for the application of gas analysis systems in highly regulated industrial and safety fields. The system and core instruments must comply with the national mandatory standards or certifications for the application field, such as equipment for explosive environments must obtain explosion-proof certificates, and CEMS for environmental monitoring must comply with HJ series standards and pass suitability tests. In addition, the system should have complete operation logs and calibration record functions to ensure that all monitoring data can be traced, meeting internal quality audits and external supervision requirements [5]. When purchasing, attention should be paid to whether the related products comply with the latest national standards, such as “GB12358-2024” which has more stringent requirements for the performance of gas detectors [9].
The long-term stable operation of the instrument relies on standardized maintenance and regular calibration. Calibration must use qualified and within-validity standard gases to ensure the traceability and reliability of measurement results [4] [8]. After the expiration of standard gases, qualified products must be purchased again, and it is strictly prohibited to continue using expired standard gases for monitoring. Such behavior is an illegal operation and will result in invalid monitoring data and may face penalties [8].