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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 3 of GB 15322.
This part is developed in accordance with the rules given in GB/T 1.1- 2009.
This part replaces GB 15322.3-2003 Combustible gas detectors - Part 3: Portable detectors for 0~100% LEL combustible gas and GB 15322.6-2003 Combustible gas detectors - Part 6: Portable detectors for combustible man-made gas. The following main technical changes have been made with respect to GB 15322.3-2003 and GB 15322.6-2003:
——The contents of GB 15322.3-2003 and GB 15322.6-2003 are incorporated into one part;
——According to the measurement range, the detectors are classified into three types: detectors with a measurement range between 3%LEL and 100%LEL, detectors with a measurement range below 3%LEL, and detectors with a measurement range above 100%LEL. According to the working mode, the detectors are classified into two types: detectors for continuous operation and single measurement detectors (see Clause 3; Clause 4 of GB 15322.3-2003 and that of GB 15322.6-2003);
——The requirements for the detector concentration display function are added (see 4.3.1.5);
——The test conditions of high temperature (operation) test and low temperature (operation) test, as well as the requirements for alarm operation values of detectors under various test conditions are revised (see Clause 4; Clause 5 of GB 15322.3-2003 and that of GB 15322.6-2003);
——The poison resistance test is added (see 4.3.12);
——The low concentration operation test is added (see 4.3.14).
This part was proposed by and is under the jurisdiction of the Ministry of Emergency Management of the People's Republic of China.
The previous editions of this part are as follows:
——GB 15322-1994;
——GB 15322.3-2003;
——GB 15322.6-2003.
Combustible gas detectors - Part 3: Portable combustible gas detectors for industrial and commercial use
1 Scope
This part of GB 15322 specifies the classification, requirements, tests, inspection rules and markings of portable combustible gas detectors for industrial and commercial use.
This part is applicable to portable combustible gas detectors (hereinafter referred to as "detectors") which are installed and used in industrial and commercial places to detect hydrocarbons, ethers, esters, alcohols, carbon monoxide, hydrogen and other combustible gases and vapors. 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 of the referenced document (including any amendments) applies.
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
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3 Classification
3.1 By measurement range:
a) Detectors with a measurement range between 3%LEL and 100%LEL;
b) Detectors with a measurement range below 3%LEL (including detectors detecting carbon monoxide);
c) Detectors with a measurement range above 100%LEL.
Note: The lower explosive limit (LEL) is the lowest explosion concentration of combustible gas or vapor in air.
3.2 By working mode:
a) Detectors for continuous operation;
b) Single measurement detectors.
4 Requirements
4.1 General
The detectors shall meet the relevant requirements of Clause 4, and shall be tested in accordance with Clause 5 to confirm whether the detectors meet the requirements of Clause 4.
4.2 Appearance requirements
4.2.1 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.
4.2.2 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.
4.3 Performance
4.3.1 General requirements
4.3.1.1 The detectors shall be powered by batteries Detectors with replaceable batteries shall have a battery installation structure to prevent reverse polarity connection.
4.3.1.2 The detectors shall have operating state indicating lights to indicate their normal monitoring, fault and alarm operating state. The green indicates normal monitoring state, the yellow indicates fault state and the red indicates alarm state. The low limit and high limit alarm state indication shall be clearly distinguished. The indicating light shall have their functions noted in Chinese. Under 5lx~500lx illumination and at 1m in front of the detector, the indicating light shall be clearly visible.
Note: Normal monitoring state refers to that the detector operates normally in an energized state, without alarm signal or fault signal.
4.3.1.3 Under the rated operating voltage, the highest sound pressure level (A-weighted) of alarming signal of detector at a distance of 1m right ahead of it shall be at least 70dB but less than 115dB.
4.3.1.4 When the concentration of combustible gas in the monitored area reaches the alarm set point, the detector shall be able to send out alarm sound and light signals. Then the detector is put in a normal environment, and it shall be able to automatically (or manually) return to the normal monitoring state within 30s.
4.3.1.5 The detector shall have the concentration display function Under 5lx~500lx illumination and at 0.5m in front of the detector, the displayed information shall be clearly visible. When the concentration of combustible gas in the monitored area exceeds its range, the detector shall have a clear indication of exceeding the range.
4.3.1.6 The range and alarm set point of detectors are specified as follows:
a) For detectors with a measurement range between 3%LEL~100%LEL, the low limit alarm set point shall be in the range of 5%LEL~25%LEL, and if there is a high limit alarm set point, it shall be 50%LEL. If the low limit alarm set point is adjustable, its low limit alarm set point shall be adjustable within the range of 5%LEL~25%LEL.
b) For detectors detecting carbon monoxide, the low limit alarm set point shall be in the range of 150×10-6 (volume fraction)~300×10-6 (volume fraction), and if there is a high limit alarm set point, it shall be 500×10-6 (volume fraction). If the low limit alarm set point is adjustable, it shall be adjustable in the range of 150×10-6 (volume fraction)~300×10-6 (volume fraction).
c) For detectors with a measurement range below 3%LEL and those with a measurement range above 100%LEL, their range and alarm set point shall be specified by the manufacturer.
d) Parameters such as range and alarm set point shall be indicated in the instructions for use of the detector.
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4.3.1.7 When a detector uses the gas sensor with a plug-in structure, it shall be protected against structural detachment. When the gas sensor is detached, the detector shall be able to send out distinguishing fault sound and light signals within 30s.
4.3.1.8 The detector shall have manual self-inspection function of acousto-optic components
4.3.1.9 The service life of the gas sensor shall be indicated in the instructions for use of the detector.
4.3.1.10 The detector shall be of explosion-proof type meeting the requirements of GB 3836.1-2010.
4.3.1.11 The model preparation of detectors shall be in accordance with GB 15322.1-2019, Annex A.
4.3.1.12 The instructions for use of detectors shall meet the relevant requirements of GB/T 9969.
4.3.2 Alarm operation value
4.3.2.1 In the test items specified in this part, the alarm operation value of detectors with a measurement range between 3%LEL and 100%LEL shall not be lower than 5%LEL, and that of detectors detecting carbon monoxide shall not be lower than 50×10-6 (volume fraction).
4.3.2.2 The difference between alarm operation value and alarm set point of detectors is specified as follows:
a) For detectors with a measurement range between 3%LEL and 100%LEL, the absolute value of the difference between the alarm operation value and the alarm set point shall not be greater than 3%LEL;
b) For detectors with a measurement range below 3%LEL, the absolute value of the difference between the alarm operation value and the alarm set point shall not be greater than 3% of the range and 50×10-6 (volume fraction), whichever is greater. For detectors detecting carbon monoxide, the absolute value of the difference between the alarm operation value and the alarm set point shall not be greater than 50×10-6 (volume fraction);
c) For detectors with a measurement range above 100%LEL, the absolute value of the difference between the alarm operation value and the alarm set point shall not be greater than 3% of the range.
4.3.3 Range indication deviation
Several test points are selected as reference values in the range of the detector, so that the concentrations of combustible gas in the monitored areas reach the corresponding reference values respectively. The difference between the display value of the detector and the reference value is specified as follows:
a) For detectors with a measurement range between 3%LEL and 100%LEL, the absolute value of the difference between the display value of combustible gas concentration at the test point and the reference value shall not be greater than 5%LEL.
b) For detectors with a measurement range below 3%LEL, the absolute value of the difference between the display value of combustible gas concentration at the test point and the reference value shall not be greater than 5% of the range or 80×10-6 (volume fraction), whichever is greater. For detectors detecting carbon monoxide, the absolute value of the difference between the concentration display value and the reference value shall not be greater than 80×10-6 (volume fraction).
c) For detectors with a measurement range above 100%LEL, the absolute value of the difference between the display value of combustible gas concentration at the test point and the reference value shall not be greater than 5% of the range.
4.3.4 Response time
Introduce the test gas with a flow rate of 500mL/min and a concentration of 60% of the full range into the detector, keep for 60s, and record the display value of the detector as the reference value, and the time required for it to reach 90% of the reference value is the response time of the detector. The response time of a detector detecting carbon monoxide shall not be greater than 60s, and that of any other gas detector shall not be greater than 30s.
4.3.5 Orientation
The front panel of the detector rotates clockwise in the horizontal plane by 45° every time, and the alarm operation value of the detector is measured respectively, which shall meet the requirements of 4.3.2.2.
4.3.6 Alarm repeatability
The alarm operation value of the same detector is repeatedly measured for six times, and its alarm operation value shall meet the requirements of 4.3.2.2.
Foreword II
1 Scope
2 Normative references
3 Classification
4 Requirements
4.1 General
4.2 Appearance requirements
4.3 Performance
4.4 Response performance for detecting gases other than methane, propane and carbon monoxide
5 Tests
5.1 Test outline
5.2 Basic performance test
5.3 Alarm operation value test
5.4 Range indication deviation test
5.5 Response time test
5.6 Orientation test
5.7 Alarm repeatability test
5.8 High speed airflow test
5.9 Battery capacity test
5.10 Electrostatic discharge immunity test
5.11 Radiated, radio-frequency electromagnetic field immunity test
5.12 High temperature (operation) test
5.13 Low temperature (operation) test
5.14 Steady-state damp-heat (operation) test
5.15 Vibration (sinusoidal) (operation) test
5.16 Vibration (sinusoidal) (durability) test
5.17 Drop test
5.18 Poison resistance test
5.19 High-concentration gas impact resistance test
5.20 Low concentration operation test
6 Inspection rules
6.1 End-of-manufacturing inspection
6.2 Type inspection
7 Marking
7.1 General
7.2 Product marking
7.3 Quality inspection marking
