GB/T 46692.2-2025Gas detectors for workplace atmospheres - Part 2: Selection, installation, use and maintenance of detectors for toxic gases (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document is Part 2 of GB/T 46692 "Gas Detectors for Workplace Atmospheres". GB/T 46692 has the following publications.

part.

---Part 1: Performance Requirements for Toxic Gas Detectors;

---Part 2: Selection, installation, use and maintenance of toxic gas detectors.

This document is modified to adopt IEC 62990-2:2021 "Workplace environment - Part 2: Gas detectors - Detection of toxic gases and vapors".

The selection, installation, use and maintenance of the equipment.

The technical differences between this document and IEC 62990-2:2021, and the reasons therefor, are as follows.

---IEC 62990-1 (see Chapters 3, 6, and 9) has been replaced with the normatively referenced GB/T 46692.1 to adapt to my country's national standards.

Improve technical conditions and increase operability.

The following editorial changes have been made to this document.

---To align with existing standards, this document has been renamed "Gas Detectors for Workplace Environments - Part 2: Toxic Gases".

Selection, installation, use and maintenance of gas detectors;

---Source information for terms 3.6 "Occupational Exposure Limits" and 3.31 "Expanded Uncertainty" has been removed;

---The international documents cited in the document have been replaced with Chinese documents, and the references have been modified.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the China Electrical Equipment Industry Association.

This document is under the jurisdiction of the National Technical Committee on Standardization of Explosion-proof Electrical Equipment (SAC/TC9).

Introduction

Toxic gases may be used when the accumulation of a mixture of toxic gases or vapors could pose a hazard or adverse effect on life or health.

Gas detectors reduce danger by detecting the presence of toxic gases or vapors and issuing appropriate audible and visual alarms. Gas detectors can also be used for starting...

Active preventative measures (such as equipment shutdown and personnel evacuation) are necessary. However, in areas where toxic gases or vapors may be present, relying solely on detector performance is insufficient.

It can ensure the safety of life and property. This includes the correct selection, installation, calibration, and regular maintenance of the detector, as well as understanding the limitations of the detection technology.

The solution has a significant impact on the required level of safety. Only through comprehensive and reliable management can the goal of safety be achieved.

GB/T 46692 aims to establish performance requirements for various toxic gas detectors and provide application guidelines, adopting a section-based approach.

The standard format includes the following two parts.

---Part 1: Performance Requirements for Toxic Gas Detectors. The purpose is to specify the general requirements and test methods for toxic gas detectors.

---Part 2: Selection, Installation, Use, and Maintenance of Toxic Gas Detectors. The purpose is to provide guidance on the selection, installation, use, and maintenance of toxic gas detectors.

Guidelines for installation, use, and maintenance.

In terms of gas detector standards, IEC has successively formulated IEC 60079-29 "Explosive Atmospheres" for combustible gas detectors.

The document pertains to the detection of toxic gases and IEC 62990, "Gas detectors for workplace environments." IEC 60079-29 within this document is already...

This will be converted to GB/T 20936 (all parts). The newly developed GB/T 46692 converts IEC 62990 into a Chinese national standard.

Gas detectors for workplace environments - Part 2.

Selection, installation, use and maintenance of toxic gas detectors

1 Scope

This document provides information on the selection, installation, use, and maintenance of electrical equipment for measuring toxic gases and vapors in workplace environments.

guide.

The primary purpose of these devices is to ensure the safety of people and property by displaying the concentration of toxic gases or vapors and warning of their presence.

This document applies to continuous sensing detectors with indication, alarm, and/or other output functions, indicating the presence of toxic gases or vapors in the environment.

The presence of gas (its sensor generates an electrical signal when gas is present) triggers protective measures automatically or manually in some cases.

The equipment described in this document includes fixed, mobile, and portable detectors.

This document covers the devices defined in GB/T 46692.1 and can also provide useful information for devices not covered in GB/T 46692.1.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 46692.1 Gas detectors for workplace environments - Part 1: Performance requirements for toxic gas detectors (GB/T 46692.1-2025,IEC 62990-1:2019,MOD)

3 Terms and Definitions

The terms and definitions defined in GB/T 46692.1 and the following terms and definitions apply to this document.

The URLs for the terminology databases maintained by ISO and IEC for standardization are as follows.

Note 1.Some definitions in GB/T 46692.1 are repeated here for ease of use.

Note 2.Other terms and definitions applicable to explosive atmospheres are found in GB/T 2900.35.

Toxic gas

Gases or vapors that are harmful to human health and/or human behavior due to their physical or physicochemical properties.

Note. The term "toxic gas" in this document includes "toxic vapor".

Interfering gas

Any gas other than the detected gas that can affect the detector's displayed value.

Note. This includes water vapor.

Clean air

Air that does not contain gases or vapors that are sensitive to the sensor or affect the sensor's performance.