GB 16808-2025Combustible gas alarm control units (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part

1.Structure and drafting rules for standardization documents" Drafting. This document replaces GB 16808-2008 "Combustible Gas Alarm Controller". Compared with GB 16808-2008, except for the structural adjustment and editing In addition to the functional changes, the main technical changes are as follows:

a) Added a chapter on "Terms and Definitions" (see Chapter 3);

b) Added the classification of combustible gas alarm controllers according to the use environment and application mode (see

c) Added enclosure protection requirements (see 5.3.1.6);

d) Added the shell combustion performance requirements (see 5.3.1.7);

e) Changed the record storage function requirements (see 5.3.1.9,

4.1.3.10 of the.2008 edition);

f) Added wiring requirements for audio components (see 5.3.4.1);

g) Added backup power supply and battery requirements (see 5.3.7);

h) Changed the display requirements for delay time (see 5.5.1.3,

4.1.3.3 of the.2008 edition);

i) Added the function that the controller can only send out a combustible gas alarm signal after receiving two or more combustible gas alarm signals Requirements (see 5.5.1.8);

j) Added the requirements for combustible gas alarm control functions (see 5.5.2);

1 Scope

China's mandatory national standard for combustible gas alarm control units. The control unit is the panel that gathers the signals from gas detectors and decides what to do: raise the alarm, close a valve, start ventilation, shut down a plant. Because it is the point where detection becomes action, its failure modes matter more than a detector's. A unit that fails silently leaves a plant unprotected while everyone believes it is monitored, so the standard requires that faults - a broken cable, a failed detector, a lost supply - be detected and signalled as faults rather than ignored, and distinguished from a gas alarm so that the response is right. Around that sit the two alarm thresholds, typically at a fifth and two fifths of the lower explosive limit, the response and reset behaviour, the battery endurance, and the electromagnetic compatibility of equipment that lives in an industrial environment.

This document defines the terminology of combustible gas alarm controllers, specifies the classification, technical requirements, inspection rules and markings, and describes the corresponding Test method. This document applies to the design, manufacture, and maintenance of combustible gas alarm controllers (hereinafter referred to as "controllers") used in industrial and civil buildings. Make and test.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document.

GB/T 4208-2017 Degrees of protection provided by enclosures (IP code)

GB 4717-2024 Fire Alarm Controller

GB/T 9969 General Principles for Instructions for Use of Industrial Products

GB 12978 Inspection Rules for Fire Protection Electronic Products

GB/T 16838 Environmental test methods and severity levels for fire protection electronic products

GB/T 17626.2 Electromagnetic compatibility test and measurement technology Electrostatic discharge immunity test

GB/T 17626.3 Electromagnetic compatibility test and measurement techniques Part

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 Shield status disabled condition The state the controller is in after the muting function is activated.

3.2 Self-test condition The state of the controller when performing self-test function.

3.3 Normal monitoring status monitoringcondition The state of the controller when it is powered on and operating normally, and no combustible gas alarm, fault alarm, shielding, self-test, etc. occurs.