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GB 15322 consists of the following parts under the general title Combustible gas detectors:
——Part 1: Point-type combustible gas detectors for industrial and commercial use;
——Part 2: Household combustible gas detectors;
——Part 3: Portable combustible gas detectors for industrial and commercial use;
——Part 4: Line-type optical beam combustible gas detectors for industrial and commercial use.
This is Part 4 of GB 15322.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part was proposed by and is under the jurisdiction of the Ministry of Emergency Management of the People's Republic of China.
Combustible gas detectors - Part 4: Line-type optical beam combustible gas detectors for industrial and commercial use
1 Scope
This part of GB 15322 specifies the terms and definitions, classification, requirements, tests, inspection rules and marking of line-type optical beam combustible gas detectors for industrial and commercial use.
This part is applicable to line-type optical beam combustible gas detectors (hereinafter referred to as "detectors"), which are installed and used in industrial and commercial places and use the principle of spectral absorption to detect combustible gases and vapors such as hydrocarbons, ethers, esters and alcohols. This part is also applicable to detectors with special performance used in industrial and commercial places, except that special requirements shall be required separately by relevant standards.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 2423.17-2008 Environmental testing for electric and electronic products - Part 2: Test methods - Test Ka: Salt mist
GB 3836.1-2010 Explosive atmospheres - Part 1: Equipment - General requirements
GB/T 9969 General principles for preparation of instructions for use of industrial products
GB 12978 Rules for test of fire electronic products
GB 15322.1-2019 Combustible gas detectors - Part 1: Point-type combustible gas detectors for industrial and commercial use
GB/T 16838 Environmental test methods and severities for fire electronic products
GB/T 17626.2-2018 Electromagnetic compatibility - Testing and measurement techniques - Electrostatic discharge immunity test
GB/T 17626.3-2016 Electromagnetic compatibility - Testing and measurement techniques - Radiated, radio-frequency, electromagnetic field immunity test
GB/T 17626.4-2018 Electromagnetic compatibility - Testing and measurement techniques - Electrical fast transient/burst immunity test
GB/T 17626.5-2008 Electromagnetic compatibility - Testing and measurement techniques - Surge immunity test
GB/T 17626.6-2017 Electromagnetic compatibility - Testing and measurement techniques - Immunity to conducted disturbances, induced by radio-frequency fields
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
optical path length
propagation distance of detection beam between transmitter and receiver (or reflector)
3.2
integral concentration
mathematical integral value of combustible gas concentration along the optical path length
Note 1: The lower explosion limit (LEL) is the lowest explosion concentration of combustible gas or vapor in air.
Note 2: The concentration of combustible gas is in LEL, the optical path length is in m, and the integral concentration is in LEL·m.
3.3
transmitter
a detector component for transmitting the detection beam
3.4
receiver
a detector component for receiving the detection beam
3.5
reflector
a detector component for reflecting the detection beam back to the receiver
4 Classification
The detectors are classified according to the service environment:
a) Indoor detectors;
b) Outdoor detectors.
5 Requirements
5.1 General
The detectors shall meet the relevant requirements of Clause 5, and shall be tested in accordance with Clause 6 to confirm whether the detectors meet the requirements of Clause 5.
5.2 Composition of detectors
The detectors shall be composed of transmitter, receiver, reflector and other components.
5.3 Appearance requirements
5.3.1 The detectors shall be provided with the complete package when they are delivered, and the package shall contain the quality certificate and the instructions for use.
5.3.2 The detectors shall be free from corrosion, coating peeling, blistering, obvious mechanical damage such as scratches, cracks, burrs, etc., on their surfaces, and free from looseness in fastening parts.
5.4 Performance
5.4.1 General requirements
5.4.1.1 The operation under energized conditions such as zeroing, calibrating and changing parameters of the detector shall not change the integrity of its housing
5.4.1.2 The detector shall be powered by DC voltage of 36V and below, and shall be protected by reverse polarity connection.
5.4.1.3 The detectors shall have independent operating state indicating lights to indicate its normal monitoring, fault and alarm operating state respectively. The green indicates normal monitoring state, the yellow indicates fault state and the red indicates alarm state. The indicating lights shall have their functions noted in Chinese. Under 5lx~500lx illumination and at 5m in front of the detector, the indicating light shall be clearly visible. Each independent energized component of the detector shall have an indication of energized state.
Note: Normal monitoring state refers to that the detector operates normally in an energized state, without alarm signal or fault signal.
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Requirements
5.1 General
5.2 Composition of detectors
5.3 Appearance requirements
5.4 Performance
6 Tests
6.1 Test outline
6.2 Basic performance test
6.3 Alarm operation performance test
6.4 Range indication deviation test
6.5 Long-term stability test
6.6 Optical intensity attenuation test
6.7 Beam deflection test
6.8 Optical interference test
6.9 Vapor interference test
6.10 Voltage fluctuation test
6.11 Electrostatic discharge immunity test
6.12 Radiated, radio-frequency electromagnetic field immunity test
6.13 Electrical fast transient/burst immunity test
6.14 Surge (impact) immunity test
6.15 Immunity test for conducted disturbance induced by radio-frequency field
6.16 High temperature (operation) test
6.17 Low temperature (operation) test
6.18 Steady-state damp-heat (operation) test
6.19 Cyclic damp-heat (operation) test
6.20 Salt mist test
6.21 Vibration (sinusoidal) (durability) test
6.22 Drop test
7 Inspection rules
7.1 End-of-manufacturing inspection
7.2 Type inspection
8 Marking
8.1 General
8.2 Product marking
8.3 Quality inspection marking
Annex A (Normative) Vapor interference test
