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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 2 of GB 15322.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB 15322.2-2003 Combustible gas detector - Part 2: Self-contained detectors for 0~100% LEL combustible gas and GB 15322.5-2003 Combustible gas detectors - Part 5: Self-contained detectors for combustible man-made gas. The following main technical changes have been made with respect to GB 15322.2-2003 and GB 15322.5-2003:
——The contents of GB 15322.2-2003 and GB 15322.5-2003 are incorporated into one part;
——The requirements for the functions of detectors are added (see 3.3.1);
——The requirements for alarm operation values of detectors under various test conditions are revised (see Clause 3; Clause 5 of GB 15322.2-2003 and that GB 15322.5-2003);
——The alarm test and ignition-proof performance test during preheating are added (see 3.3.7 and 3.3.8);
——The surge immunity test and immunity test for conducted disturbance induced by radio-frequency field have been added to the electromagnetic compatibility test items (see 3.3.13):
——The poison resistance test and low concentration operation test are added (see 3.3.17 and 3.3.18);
——The low-concentration carbon monoxide concentration response performance test is added for the carbon monoxide detector (see 3.3.20).
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 15322.2-2003;
——GB 15322.5-2003.
Combustible gas detectors - Part 2: Household combustible gas detectors
1 Scope
This part of GB 15322 specifies the requirements, tests, type rules and markings for household combustible gas detectors.
This part is applicable to detectors used in domestic environment for detecting combustible gases such as natural gas, liquefied petroleum gas and artificial coal gas and their incomplete combustion products.
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/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
GB 23757 Protection requirements for fire electronic products
3 Requirements
3.1 General
The household combustible gas detectors (hereinafter referred to as the “Detectors”) shall meet the relevant requirements of Clause 3, and shall be tested in accordance with Clause 4 to confirm whether the detectors meet the requirements of Clause 3.
3.2 Appearance requirements
3.2.1 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.
3.2.2 The detectors shall be free from corrosion, coating peeling, blistering, obvious mechanical damage such as scratches, cracks and burrs, etc., on their surfaces, and free from looseness in fastening parts.
3.3 Performance
3.3.1 General requirements
3.3.1.1 The detectors shall be powered by DC voltage of 36V and below or AC voltage of 220V. Those powered by external DC power supply shall be powered by combustible gas alarm controller, and shall be protected against polarity reverse connection. A battery-powered detector shall have a battery installation structure to prevent polarity reverse connection, and shall show obvious warning signs when the battery is removed.
3.3.1.2 The surface of the detector shall have 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.
Note 1: Normal monitoring state refers to that the detector operates normally in an energized state, without alarm signal or fault signal.
3.3.1.3 The detectors shall have the function of indicating the state of the gas sensor’s service life and meet the following requirements:
a) The state of the gas sensor’s service life shall be indicated by a yellow light;
b) When the accumulated working time of a detector reaches the service life limit of the gas sensor, the yellow light shall twinkle;
c) The surface of the detector shall have obvious marks indicating that the gas sensor needs to be replaced when the yellow light twinkles;
d) The service life of the gas sensor shall be indicated in the instructions for use of the detector.
3.3.1.4 A detector with concentration display function shall have the displayed information clearly visible, the display information shall be clearly visible under 5lx~500lx illumination and at 1m right in front of the detector.
3.3.1.5 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.
3.3.1.6 The detectors shall have the function of control output. The type and capacity of control output interface shall match with those of the mating products or executive components specified by the manufacturer, and shall be indicated in the instructions for use. If the control output interface of the detector has a delay function, the maximum delay time shall not exceed 30s.
3.3.1.7 The detectors shall have a networking interface that can be connected with the control and indication equipment (except for those only powered by battery), and the networking interface shall be capable of outputting signals corresponding to its measured concentration and signals of normal monitoring, fault, alarm and sensor’s service life state of the detector. Information such as signal types and parameters shall be indicated in the instructions for use.
3.3.1.8 When the concentration of combustible gas in the monitored area reaches the alarm set point, the detector shall be able to send out an alarm signal. 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.
3.3.1.9 The alarm set point of detector shall be in the range of 5%~25%LEL, with its upper range limit neither less than twice the alarm set point nor less than 15%LEL; the alarm set point of detector detecting carbon monoxide shall be in the range of 150×10-6 (volume fraction)~300×10-6 (volume fraction).
Note: The lower explosion limit (LEL) is the lowest explosion concentration of combustible gas or vapor in air.
3.3.1.10 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 a fault signal within 30s.
3.3.1.11 The detectors shall have the function of manual self-inspection of its acoustic-optic components, and their control output interfaces shall be delayed for 7s~30s before action during self-inspection.
3.3.1.12 The housing protection class (IP code) of detector shall meet the requirements for IP30 in GB 23757.
3.3.1.13 The model preparation of detector shall meet the requirements of GB 15322.1-2019, Annex A.
3.3.1.14 There shall be a timing device inside a detector, with its daily timing error not exceeding 30s.
3.3.1.15 A detector shall have alarm history record function, through which the history record shall be saved after the detector has power failure. The type and number of historical records shall meet the following requirements:
a) The number of alarm records of detector: not less than 200;
b) The number of alarm recovery records of detector: not less than 200;
c) The number of fault records of detector: not less than 100;
d) The number of fault recovery records of detector: not less than 100;
e) The number of power failure records of detector: not less than 50;
f) The number of power-on records of detector: not less than 50;
g) The number of failure record of gas sensor: not less than one.
3.3.1.16 There shall be an reading interface inside a detector, and for a detector using a combustible gas alarm controller, its alarm history record shall be able to be completely read by its alarm history record reading device. See Annex A for the physical characteristics and communication protocol of the reading interface.
3.3.1.17 The detectors shall have the maximum numbers of alarm history records stored in the memory indicated in the instructions for use.
3.3.1.18 The instructions for use of detectors shall meet the relevant requirements specified in GB/T 9969.
3.3.2 Alarm operation value
3.3.2.1 In the test items specified in this part, the alarm operation value of detectors shall not be lower than 5%LEL, and the alarm operation value of detectors detecting carbon monoxide shall not be lower than 50×10-6 (volume fraction).
Note: The lower explosion limit (LEL) is the lowest explosion concentration of combustible gas or vapor in air.
3.3.2.2 The absolute value of the difference between alarm operation value and alarm set point of detector shall not be greater than 3%LEL, and the aforesaid absolute value of detectors detecting carbon monoxide shall not be greater than 50×10-6 (volume fraction).
3.3.3 Range indication deviation (applicable to detectors with concentration display function)
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 absolute value of the difference between the display value of combustible gas concentration at the test point and the reference value of the detector shall not be greater than 3%LEL. The absolute value of the difference between the concentration display value and the reference value of the detector detecting carbon monoxide shall not be greater than 80×10-6 (volume fraction).
3.3.4 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 with concentration display function, 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. Introduce test gas with a flow rate of 500mL/min and a concentration of 1.6 times the alarm set point into the detector with no concentration display function, start timing, and the time required for the detector to send out an alarm signal 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.
3.3.5 Orientation
The detectors rotate clockwise in the installation plane, by 45° every time, and the alarm operation values of the detectors are measured respectively. The absolute value of the difference between the alarm operation value and the alarm set point of a detector shall not be greater than 3%LEL; the absolute value of such difference of a detector detecting carbon monoxide shall not be greater than 50×10-6 (volume fraction).
3.3.6 Alarm repeatability
Repeatedly measure the alarm operation value of a detector 6 times, and the absolute value of the difference between the alarm operation value and the alarm set point shall not be greater than 3%LEL. The absolute value of the difference between the alarm operation value and the alarm set point of a detector detecting carbon monoxide shall not be greater than 50×10-6 (volume fraction).
3.3.7 Alarm during preheating
After being kept in the non-energized state for 24h, the detector shall have power supply restored under the environmental condition that the test gas concentration is 30%LEL, and the detector detecting carbon monoxide shall have power supply restored under the environmental condition that the carbon monoxide concentration is 380×10-6 (volume fraction). The detectors shall be able to send out an alarm signal within 5min after the power supply is restored.
3.3.8 Ignition-proof performance
Keep a detector detecting methane or carbon monoxide in a test chamber with methane concentration of 8.5% (volume fraction), and a detector detecting propane in a test chamber with propane concentration of 4.6% (volume fraction), in the non-energized state, both for 5min. Restore the power supply to the detectors and keep it for 5min, during which no combustible gas ignition or explosion shall occur.
3.3.9 Voltage fluctuation (not applicable to detectors powered only by battery)
The power supply voltage of a detector is adjusted to 85% and 115% of its rated voltage, respectively, and the alarm operation value of the detector shall be measured. The absolute value of the difference between its alarm operation value and alarm set point shall not be greater than 3%LEL. The absolute value of the difference between the alarm operation value and the alarm set point of a detector detecting carbon monoxide shall not be greater than 50×10-6 (volume fraction).
3.3.10 Battery capacity
3.3.10.1 For a detector which is only powered by battery, the battery shall be discharged for 30 days at 25 times the maximum working current. After the discharge, the battery capacity of the detector shall be able to ensure its normal operation for not less than 2h. When the battery power is low, the detector shall be able to send out sound and light indicating signals which are obviously different from the alarm signals, and the control output interface shall be able to normally drive its mating products or executive components.
3.3.10.2 A detector with standby battery shall have different status indications when working under two different power supply conditions: main power and standby power. The standby battery capacity shall be able to guarantee its normal operation for not less than 8h. When the standby battery power is low, the detector shall be able to send out sound and light indicating signals which are obviously different from the alarm signals, and the control output interface shall be able to normally drive its mating products or executive components.
3.3.10.3 When the battery power is indicated to be low, the alarm operation value of the detector shall be measured. The absolute value of the difference between its alarm operation value and alarm set point shall not be greater than 5%LEL. The absolute value of the difference between the alarm operation value and the alarm set point of a detector detecting carbon monoxide shall not be greater than 80×10-6 (volume fraction).
3.3.11 Insulation resistance
When the operating voltage of the external live terminal and the power plug of a detector is greater than 50V, the insulation resistance between the external live terminal and the power plug and the housing shall not be less than 100MΩ under normal atmospheric conditions.
3.3.12 Electrical strength
When the operating voltage of the external live terminal and power plug of the detector is greater than 50V, the external live terminal and power plug shall be able to withstand the electrical strength test carried out under the AC voltage with the frequency of 50Hz and the RMS voltage of 1,250V, for 60s. No breakdown and discharge shall occur during the test. The detector shall have normal function after the test.
3.3.13 Electromagnetic compatibility
The detector shall be able to withstand various tests under the electromagnetic interference conditions specified in Table 1. During the test, the detector shall not send out alarm signals or fault signals. The absolute value of the difference between the alarm operation value and the alarm set point of the detector shall not be greater than 5%LEL after the test. The absolute value of the difference between the alarm operation value and the alarm set point of a detector detecting carbon monoxide shall not be greater than 80×10-6 (volume fraction).
Table 1 Electromagnetic compatibility test parameters
Test name Test parameter Test condition Operating state
Electrostatic discharge immunity test Discharge voltage
kV Air discharge (insulator housing): 8
Contact discharge (conductor housing and coupling plate): 6 Normal monitoring state
Discharge polarity Anode and cathode
Discharge interval
s ≥1
Number of discharges per point 10
Radiated, radio-frequency, electromagnetic field immunity test Field strength
V/m 10 Normal monitoring state
Frequency range
MHz 80~1,000
Radiated, radio-frequency, electromagnetic field immunity test Sweep rate
10oct/s ≤1.5×10-3 Normal monitoring state
Modulation amplitude 80% (1 kHz, sine)
Electrical fast transient/burst immunity test (not applicable to detectors powered by batteries only) Transient/burst voltage
kV AC power line: 2×(1±0.1)
Other connecting line: 1×(1±0.1) Normal monitoring state
Repetition frequency
kHz 5×(1±0.2)
Polarity Anode and cathode
Time
min 1
Surge immunity test
(Not applicable to detectors powered by batteries only) Surge voltage
kV AC power line: line-line 1×(1±0.1)
AC power line: line-ground 2×(1±0.1)
Other connecting line: line-ground 1×(1±0.1) Normal monitoring state
Polarity Anode and cathode
Number of tests 5
Test interval
s 60
Immunity test for conducted disturbance induced by radio-frequency field (not applicable to detectors powered by batteries only) Frequency range
MHz 0.15~80 Normal monitoring state
Voltage
dBμV 140
Modulation amplitude 80% (1 kHz, sine)
3.3.14 Climatic environmental tolerance
The detector shall be able to withstand various tests under the climatic environmental conditions specified in Table 2. During the test, the detector shall not send out alarm signals or fault signals. The absolute value of the difference between the alarm operation value and the alarm set point of the detector shall not be greater than 10%LEL after the test. The absolute value of the difference between the alarm operation value and the alarm set point of a detector detecting carbon monoxide shall not be greater than 160×10-6 (volume fraction).
Foreword III
1 Scope
2 Normative references
3 Requirements
3.1 General
3.2 Appearance requirements
3.3 Performance
4 Tests
4.1 Test outline
4.2 Basic performance test
4.3 Alarm operation value test
4.4 Range indication deviation test (applicable to specimens with concentration display function)
4.5 Response time test
4.6 Orientation test
4.7 Alarm repeatability test
4.8 Alarm test during preheating
4.9 Explosion-proof performance test
4.10 Voltage fluctuation test (not applicable to specimens powered by batteries only)
4.11 Battery capacity test
4.12 Insulation resistance test
4.13 Electrical strength test
4.14 Electrostatic discharge immunity test
4.15 Radiated, radio-frequency electromagnetic field immunity test
4.16 Electrical fast transient/burst immunity test (not applicable to specimens powered by batteries only)
4.17 Surge (impact) immunity test (not applicable to specimens powered by batteries only)
4.18 Immunity test for conducted disturbance induced by radio-frequency field (not applicable to specimens powered by batteries only)
4.19 High temperature (operation) test
4.20 Low temperature (operation) test
4.21 Steady-state damp-heat (operation) test
4.22 Vibration (sinusoidal) (operation) test
4.23 Vibration (sinusoidal) (durability) test
4.24 Drop test
4.25 Gas interference resistance test
4.26 Poison resistance test
4.27 Low concentration operation test
4.28 Long-term stability test
4.29 Low-concentration carbon monoxide response performance test (only applicable to specimens for detecting carbon monoxide)
5 Inspection rules
5.1 End-of-manufacturing inspection
5.2 Type inspection
6 Marking
6.1 General
6.2 Product marking
6.3 Quality inspection marking
Annex A (Informative) Reading device for alarm history records of combustible gas detectors
