Design and Experiment of Fumigant Gas Trace Detection System Based on Photoionization

Abstract

To meet the requirements, based on the provision of Administration of Quality Supervision, Inspection and Quarantine (AQSIQ), of gas leakage monitoring inside dosing room of fumigant warehouse at the inspection and quarantine port, a fumigant gas trace detection system (FGTDS) based on photoionization detector (PID) is developed. The principle, structure and characteristic of the system design are especially demonstrated. The test data under different temperature, relative humidity (RH) and methyl bromide concentration demonstrate that the FGTDS based on PID can measure methyl bromide under very low concentration. A conclusion can be drawn that the requirements of gas leakage monitoring inside dosing room of fumigation warehouse at the inspection and quarantine port can be met through further proper design.