GB/T 20936.1-2022Gas detectors for explosive atmospheres - Part 1: Performance requirements of detectors for flammable gases (English PDF)

1 Scope

This document specifies portable, mobile and stationary combustible gas or

General requirements and test methods for the structure and performance of vapor detectors.

This document is applicable to the detection of combustible gases with indication, alarm or other output functions measuring any volume fraction specified by the manufacturer

These detectors are used to indicate potential explosion hazards and, in some cases, automatically or manually trigger linkage protection devices.

In this document, the term "shown to volume fraction X% or X% LFL" includes the upper limit of the measurement range equal to or less than X% or X% LFL device of.

This document also applies to aspirating detectors with internal sampling systems for safety applications in commercial, industrial, and non-residential settings.

This document does not apply to external sampling systems, laboratory equipment, scientific research equipment or equipment used only for process monitoring and/or control, nor

For open path (light path) detectors within the scope of GB/T 20936.4.Only those intended for uniform density along the optical path have

Devices with very short optical paths are within the scope of this document.

For detectors that detect multiple gases, this document only applies to the detection of flammable gases or vapors.

This document is a supplement and modification to the general requirements of GB/T 3836.1.When the requirements of this document conflict with the requirements of GB/T 3836.1

In case of emergency, the requirements of this document take precedence.

Note 1.This document only proposes the safety level and performance requirements for general-purpose equipment. For special-purpose equipment, product purchasers (or appropriate entrusted person) may impose additional special test or approval requirements on the equipment. For example, for Class I detectors (equipment used in coal mine gas environment), it is also required to comply with

Comply with the relevant provisions of the national "Coal Mine Safety Regulations".

Note 2.A detector calibrated for a specific gas or vapor cannot accurately indicate other gases or vapors.

For this document, the terms "lower explosion limit (LEL)" and "lower flammability limit (LFL)" are considered synonymous. Likewise, the term "explosion on

"Upper Limit (UEL)" and "Upper Limit of Flammability (UFL)" are also considered synonyms. For ease of reference, these two sets of terms shown can be used in the text

Their acronyms LEL and UEL.

Note 3.Concentration indication (volume fraction) can also be used to measure to 100%LFL or 20%LFL equipment. In this case, in verifying the performance of Appendix A

When required, it may be necessary to consult the manufacturer for the selection of units of measurement.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references

For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 2423.10 Environmental testing - Part 2.Test method Test Fc. Vibration (sinusoidal) (GB/T 2423.10-2019,

IEC 60068-2-6.2007, IDT)

GB/T 3836.1 Explosive atmospheres Part 1.General requirements for equipment (GB/T 3836.1-2021, IEC 60079-0.

2017, MOD)

GB/T 3836.11 Explosive atmospheres Part 11.Test methods and data for classification of properties of gases and vapors (GB/T 3836.11-2022, ISO /IEC 80079-20-1.2017, IDT)

GB/T 18268.1 Electromagnetic Compatibility Requirements for Electrical Equipment for Measurement, Control and Laboratory Use Part 1.General Requirements

GB/T 25285.1 | GB/T 20936.4 | GB/T 29304 | GB/T 19518.2 | GB/T 24626 | GB/T 20936.2 | […]