JJG 1022-2016 English PDF (JJG1022-2016)

This Regulation applies to the initial verification, subsequent verification, in-use inspection of formaldehyde gas detectors (hereinafter referred to as instruments), that use the principle of electrochemical sensors and semiconductor gas sensors to measure formaldehyde content in the air. The upper limit of the verification of this Regulation is 1.5 ¦Ìmol/mol. It is not applicable to formaldehyde gas detectors using the colorimetric principles. 2 Overview The detection principle of the instrument is generally the electrochemical sensor principle and the semiconductor gas sensor principle. There are two sampling methods: inhalation and diffusion. The instrument mainly consists of sampling unit, sensor, electronic circuit, display, etc. 3 Measurement performance requirements 3.1 Indication error The indication error shall comply with the requirements in Table 1. Table 1 -- Indication error 3.2 Repeatability Not more than 5%. 3.3 Response time The response time of the instrument, which uses the inhalation sampling method, is not Measuring range/ (¦Ìmol/mol) Maximum allowable error JJG 1022-2016 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 22 greater than 90 s. The response time of the instrument, which uses the diffusion sampling method, is not greater than 180 s. 3.4 Drift 3.4.1 Zero-point d