GB 12791-2025 English PDF
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GB 12791: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB 12791-2025 | 695 | Add to Cart | Auto, 9 seconds. | Point-type flame detectors | Valid |
| GB 12791-2006 | 270 | Add to Cart | Auto, 9 seconds. | Point type ultraviolet flame detectors | Valid |
| GB 12791-1991 | 759 | Add to Cart | 5 days | Performance requirements and test methods for point ultraviolet flame detectors | Obsolete |
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GB 12791-2025: Point-type flame detectors
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB12791-2025GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 13.220.20 CCS C 81 Replacing GB 12791-2006, part of GB 15631-2008 Point-type flame detectors Issued on: OCTOBER 31, 2025 Implemented on: NOVEMBER 01, 2026 Issued by. State Administration for Market Regulation; National Standardization Administration.
Table of Contents
Foreword... 4 1 Scope... 6 2 Normative references... 6 3 Terms and definitions... 7 4 Classification and naming... 7 5 Requirements... 8 5.1 General requirements... 8 5.2 Appearance... 8 5.3 Indicator lights... 9 5.4 Auxiliary equipment connection... 9 5.5 Factory setting adjustment... 9 5.6 Field sensitivity adjustment... 9 5.7 Control software... 10 5.8 User manual... 11 5.9 Connection fault monitoring... 11 5.10 Reproducibility... 11 5.11 Repeatability... 12 5.12 Direction dependence... 12 5.13 Fire sensitivity performance... 12 5.14 Optical surface contamination monitoring... 12 5.15 Light interference resistance... 13 5.16 Sunlight interference resistance... 13 5.17 Thermal interference resistance... 14 5.18 Climate and environmental tolerance performance... 14 5.19 Mechanical environmental tolerance... 15 5.20 Electromagnetic compatibility performance... 16 5.21 Power supply parameter fluctuation performance... 17 5.22 Enclosure protection performance... 18 6 Testing... 18 6.1 General requirements... 18 6.2 Visual inspection... 21 6.3 Functional design inspection... 21 6.4 Connection fault monitoring test... 22 6.5 Reproducibility test... 22 6.6 Repeatability test... 23 6.7 Direction dependence test... 23 6.8 Fire sensitivity test... 24 6.9 Optical surface contamination test... 24 6.10 Light interference test... 25 6.11 Sunlight interference test... 27 6.12 Thermal interference test... 27 6.13 High temperature (operating) test... 28 6.14 Low temperature (operating) test... 29 6.15 Alternating damp heat (operating) test... 30 Point-type flame detectors1 Scope
This document defines the terminology for point-type flame detectors; specifies their classification and naming, requirements, inspection rules, markings; describes the corresponding test methods. This document applies to the design, manufacture, inspection of point-type flame detectors (hereinafter referred to as "detectors") used in industrial and civil buildings.2 Normative references
The following documents, through normative references in the text, constitute essential provisions of this document. For dated references, only the edition cited applies; for undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 4208-2017 Degrees of protection provide by enclosure (IP code) GB/T 9969 General principles for preparation of instructions for use of industrial products GB 12978 Rules for test of fire electronic products GB/T 16838 Environmental test and severities for fire electronic products GB/T 17626.2 Electromagnetic compatibility - Testing and measurement techniques - Electrostatic discharge immunity test GB/T 17626.3 Electromagnetic compatibility - Testing and measurement techniques - Part 3.Radiated, radio-frequency, electromagnetic field immunity test GB/T 17626.4 Electromagnetic compatibility - Testing and measurement techniques - Electrical fast transient/burst immunity test GB/T 17626.5 Electromagnetic compatibility - Testing and measurement techniques - Surge immunity test GB/T 17626.6 Electromagnetic compatibility - Testing and measurement techniques - Immunity to conducted disturbances, induced by radio-frequency fields3 Terms and definitions
The following terms and definitions apply to this document. 3.1 Infrared flame detector A detector that generates an alarm decision-related response only to infrared radiation, which has a wavelength greater than 850 nm. 3.2 Ultraviolet flame detector A detector that generates an alarm decision-related response only to ultraviolet radiation, which has a wavelength less than 300 nm. 3.3 Response point D The maximum distance at which the detector, exposed to specific flame radiation, can emit a reliable fire alarm signal within 30 seconds. Note. Dmax, Dmin, represent the maximum, minimum, average values of a set of response point D values, respectively. The response point D values are determined according to the method in 6.1.5. 3.4 Sensitivity A measure of the detector's ability to detect fires. 3.5 Sensitivity adjustment The function of adjusting the alarm conditions of the detector or its control and indication equipment to achieve sensitivity changes.4 Classification and naming
4.1 Detectors are classified according to their detection principle as follows. a) Infrared flame detectors (hereinafter referred to as "infrared type"); b) Ultraviolet flame detectors (hereinafter referred to as "ultraviolet type"); c) Infrared-ultraviolet composite flame detectors (hereinafter referred to as "composite type"). 4.2 Detectors are classified according to their environmental adaptability as follows. a) Type A; b) Type B. Note. Type B, based on Type A, has improved requirements for resistance to light interference (see 5.15), climatic environmental tolerance (see 5.18), enclosure protection (see 5.22); it also adds requirements for optical surface contamination monitoring (see 5.14), resistance to sunlight interference (see 5.16), resistance to thermal interference (see 5.17). Based on low-temperature (operational) test conditions, it is designated as Type B (-25 °C) or Type B (-40 °C) (see 5.18.1). 4.3 Detectors are classified by sensitivity as follows. a) Class 1 (25 m); b) Class 2 (17 m); c) Class 3 (12 m); d) Class 1S [A distance greater than 25 m (Lm) as specified by the manufacturer is designated as Class 1S (Lm)].5 Requirements
5.1 General requirements Detectors shall meet the requirements of this chapter and shall be tested in accordance with the provisions of Chapter 6, to confirm compliance with the requirements of this chapter. 5.2 Appearance Detectors shall be in their original packaging as when they left the factory. The detector surface shall bear product markings; the packaging shall include a quality inspection certificate and an instruction manual. The detector surface shall be free from corrosion, coating peeling, blistering; it shall be free from obvious scratches, cracks, burrs, or other mechanical damage. Fasteners shall be secure. 5.3 Indicator lights 5.3.1 The indicator lights of the detector shall indicate both fire alarm and normal monitoring status. The fire alarm status shall be indicated by red. 5.3.2 When the radiation source's illumination meets the requirements for the detector to issue a fire alarm response, the fire alarm indicator light shall illuminate and remain illuminated until the alarm state is reset. Except in commissioning mode, the detector's fire alarm status indication shall be clearly distinguishable from other operating status indications. For detachable detectors, the fire alarm indicator light shall be mounted on the probe or base. 5.3.3 Under ambient light conditions not exceeding 500 lx, when the indicator light is illuminated, at a distance of 6 m in front of it, it shall meet the following requirements. a) Clearly visible in any direction with an angle of no more than 5° to the detector's axis; b) Clearly visible in at least one direction with an angle of 45° to the detector's axis. 5.4 Auxiliary equipment connection When the detector is connected to auxiliary equipment (e.g., remote indicators, control relays, etc.), a short circuit or open circuit in the connection line between the detector and the auxiliary equipment shall not affect the normal operation of the detector. 5.5 Factory setting adjustment The detector's factory settings shall not be changed, except by using special means (e.g., special tools or passwords) or breaking the seal. 5.6 Field sensitivity adjustment If field sensitivity adjustment is permitted on the detector or its control and indication equipment, the following requirements shall be met. a) The detector shall meet the requirements of this document under all settings explicitly stated by the manufacturer as conforming to the requirements of this document; its sensitivity level shall be identifiable as indicated on the detector; b) For the settings described in a), adjustment may only be made using special tools, a password, or by separating the probe from its base; ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
