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GB 12358-2006 English PDF (GB12358-2006)

GB 12358-2006 English PDF (GB12358-2006)

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GB 12358-2006: Gas monitors and alarms for workplace -- General technical requirements

This Standard specifies the terminology, classification, technical requirements, test methods, inspection rules, and identification of gas monitors and alarms for workplaces. This Standard is applicable to the production and use of monitors and alarms for flammable gas, toxic gas and oxygen in workplaces within the territory of the People Republic of China. The monitors and alarms used in other special places shall also be implemented this Standard in addition to otherwise specified in the relevant standards.
GB 12358-2006
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 13.320
C 69
Replacing GB 12358-1990
Gas Monitors and Alarms for Workplace - General
Technical Requirements
ISSUED ON: JUNE 22, 2006
IMPLEMENTED ON: DECEMBER 01, 2006
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Classification ... 7
5 Technical Requirements ... 9
6 Test Methods ... 15
7 Markings ... 29
8 Inspection Rules ... 30
9 Packaging, Transportation and Storage ... 31
10 Instruction Manual... 31
Gas Monitors and Alarms for Workplace - General
Technical Requirements
1 Scope
This Standard specifies the terminology, classification, technical requirements, test methods, inspection rules, and identification of gas monitors and alarms for workplaces (hereinafter referred to as "monitors and alarms").
This Standard is applicable to the production and use of monitors and alarms for flammable gas, toxic gas and oxygen in workplaces within the territory of the PEOPLE Republic of China. The monitors and alarms used in other special places shall also be implemented this Standard in addition to otherwise specified in the relevant standards. 2 Normative References
The provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.
GB/T 2421 Environmental Testing for Electric and Electronic Products - Part 1: General and Guidance
GB 3836.1 Explosive Atmospheres - Part 1: Equipment - General Requirements GB 3836.2 Electrical Apparatus for Explosive Atmosphere - Part 2: Flameproof Electrical Apparatus d
GB 3836.4 Explosive Atmospheres - Part 4: Equipment Protection by Intrinsic Safety i
GB/T 4798.10 Environmental Conditions Existing in the Application of Electric and Electronic Products ?€? Guidance
GB/T 4857.5 Packaging - Transport Packages - Vertical Impact Test Method by Dropping
GB 15322-2003 (all parts) Combustible Gas Detectors
5 Technical Requirements
5.1 General
The technical requirements and test methods of gas alarm instrument and gas detection and alarm instrument shall implement this Standard. Firstly, meet the technical requirements of this Clause; and then test according to the provisions of Clause 6; and meet the test requirements.
5.2 Requirements for structure and appearance
5.2.1 Gas alarm (hereinafter referred to as "alarm instrument" or "detection and alarm instrument") shall be composed of two parts: detection parts and alarm parts; gas detection and alarm instrument shall be composed of three parts: detection parts, indicator parts and alarm parts.
5.2.2 The portable alarm instrument shall be small in size, light in weight, and easy to carry or move.
5.2.3 The detection parts of the stationary alarm instrument shall have a weather-proof, sand-proof and insect-proof structure, and be easy to install; the alarm parts shall be easy to install, operate and monitor.
5.2.4 The instrument shall be made of corrosion-resistant materials or be treated with anti-corrosion on the surface of the instrument, and its coating and colouring shall not fall off easily.
5.2.5 The alarm instrument shall be easy to identify when it is in working condition. 5.2.6 The alarm instrument shall be easy to calibrate.
5.2.7 When the alarm instrument is used in a place with flammable and explosive gas, it shall have explosion-proof performance, comply with GB 3836.1, GB 3836.2 and GB 3836.4; and obtain an explosion-proof inspection certificate.
5.2.8 Alarm instrument, detection and alarm instrument shall have effective alarm devices.
5.3 Performance requirements
5.3.1 The detection and alarm instrument shall have the following functions: 5.3.1.1 The detection and alarm instrument shall be equipped with manual self- inspection function for the sound and light alarm devices.
5.3.1.2 For the detection and alarm instrument with output control function, when the detection and alarm instrument sends out an alarm signal, it shall be able to start the is ??5%.
6.1.5 The detection and alarm instrument (hereinafter referred to as "specimen") shall be inspected for appearance and structure according to 5.2 before the test, and the test can be carried out only when it meets the requirements.
6.1.6 When the specimen enters the working state and the specified stabilization time has passed, the test can be started. When calibrating the instrument, use zero gas and standard gas. The standard gas shall be that produced by a nationally recognized standard gas manufacturer. Different concentrations of standard gas can be prepared with a gas dilution device that has passed the measurement certification, but the gas concentration must meet the uncertainty of ???2.0%.
6.2 Function test
6.2.1 Purpose
Inspect the function of the specimen.
6.2.2 Requirements
The function of the specimen shall meet the requirements of 5.3.1.
6.2.3 Methods
Operate the self-inspection mechanism of the sample; observe and record the sound and light alarm conditions of the specimen.
6.3 Battery performance test
6.3.1 Purpose
Inspect the battery performance of the specimen.
6.3.2 Requirements
The battery performance of the specimen shall meet the requirements of 5.3.2. 6.3.3 Methods
6.3.3.1 Inspect the setting of the low battery indicator function of the specimen battery. 6.3.3.2 For a portable detection and alarm instrument, make the specimen work continuously until the battery indicates low and then work for another 15min. Then, according to methods in 6.4.3 and 6.5.3 to check the detection error and alarm error of the specimen. Then put a battery with sufficient power into the continuously working specimen make it in the normal monitoring state. After 8h, check the working condition of the specimen.
6.5.3.3 When inspecting the toxic gas alarm instrument, calibrate the instrument or device according to the manufacturer's provisions. Inject the tested gas below the setting alarm content into the detection parts; and then the content of the test gas shall be gradually increased until an alarm occurs. Calculate the error between the test gas content and the alarm setting value at this time.
6.6 Repeatability test
6.6.1 Purpose
Inspect the consistency of multiple alarms issued from the single detection and alarm instrument.
6.6.2 Requirements
The repeatability of the specimen shall meet the requirements of 5.3.5. 6.6.3 Methods
Calibrate the instrument or device according to the manufacturer's provisions. Perform 6 consecutive tests on any orientation and content of the specimen's normal working position; and use at least one content to calculate its error.
6.7 Orientation test
6.7.1 Purpose
Inspect the air intake performance of the detection and alarm instrument in different orientations.
6.7.2 Requirements
The orientation performance of the specimen shall meet the requirements of 5.3.6. 6.7.3 Methods
Keep the sample in a normal monitoring state for 20min; increase the test gas content at a certain rate; and detect the 0?? indication value of the specimen above the Z axis; afterwards, perform a test every 45?? rotation and measure the indication value for each orientation on the Z axis. Measure the indication values of each orientation on the Y and X axes, respectively. If the external structure and internal component structure of the detection parts on the Y and X axes have no effect on the airflow velocity, the Y and X axis tests may be exempted from being carried out.
6.8 Voltage fluctuation test
6.8.1 Purpose
6.10 Full-scale indication deviation test
6.10.1 Purpose
Inspect the full-scale indication deviation of the specimen.
6.10.2 Requirements
The full-scale indication deviation of the specimen shall meet the requirements of 5.3.9. 6.10.3 Methods
6.10.3.1 Connect the specimen to the power supply and put it in a normal monitoring state for 20min.
6.10.3.2 Respectively adjust the flow rates of combustible gas and clean air entering the gas diluter to prepare a flow rate of 500mL/min; and respectively reach the test gas with specimen full scale of 10%, 25%, 50%, 75%, 90% contents. Then deliver the prepared test gas to the sensor element of the specimen for at least 1min through the calibration cover; and record the indication of the specimen in each case. 6.11 High-speed airflow test
6.11.1 Purpose
Inspect the adaptability of the specimen to high-speed airflow.
6.11.2 Requirements
The high-speed airflow performance of the specimen shall meet the requirements of 5.3.9.
6.11.3 Methods
6.11.3.1 Install the specimen in the test chamber according to the requirements of the normal working state; turn on the power, and keep the specimen in the normal monitoring state for 20min.
6.11.3.2 Start the ventilator to stabilize the airflow velocity in the test chamber at 6m/s??0.5m/s; and check the detection error and alarm error of the specimen according to the methods in 6.4.3 and 6.5.3.
6.12 Long-term stability test (only applicable to stationary installation of detection and alarm instrument)
6.12.1 Purpose
Inspect the long-term stability of the specimen under normal atmospheric conditions. The withstand voltage performance of the specimen shall meet the requirements of 5.3.12.
6.14.3 Methods
6.14.3.1 Use a withstand voltage test device to apply 50Hz and 1500 (1??10%) V (rated voltage exceeding 50V) to the test part of the specimen at a boost rate of 100V/s~500V/s; or apply 50 (1??1%) Hz, 500 (1??10%) V (rated voltage not exceeding 50V) A.C. voltage for 60s??5s; observe and record the phenomenon that occurs during the test, The parts to be tested include:
a) Between the external live terminal and the shell with insulation requirements; b) Between the power plug and the shell (the power switch is placed in the disconnecting position, and the power is not connected).
6.14.3.2 After the test, conduct a power-on inspection on the specimen. 6.15 Radiated electromagnetic field test
6.15.1 Purpose
Inspect the adaptability of the specimen to work in the radiated electromagnetic field environment.
6.15.2 Requirements
The anti-radiation electromagnetic field performance of the specimen shall meet the requirements of 5.3.13.
6.15.3 Methods
6.15.3.1 Place the specimen on the insulation bench; turn on the power supply; and make the specimen in a normal monitoring state for 20min.
6.15.3.2 Arrange the test equipment according to Figure 1; place the transmitting antenna in the middle; and place the specimen and the electromagnetic interference alarm at 1m away from each side of the transmitting antenna.
detection error and alarm error of the specimen.
6.16 Electrostatic discharge test
6.16.1 Purpose
Inspect the adaptability of the specimen to electrostatic discharge caused by persons and objects with static electricity.
6.16.2 Requirements
The anti-static discharge performance of the specimen shall meet the requirements of 5.3.14.
6.16.3 Methods
6.16.3.1 Place the specimen on the insulation bench; and the distance from the periphery of the grounding plate is no less than 100mm. Turn on the power to make the specimen in normal monitoring state for 20min.
6.16.3.2 Adjust the output voltage of the electrostatic generator to 8000V; and touch the surface of the specimen as soon as possible after charging with the ball-shaped discharge head; and make sure to contact it (but not damaging the specimen). After each discharge, the electrostatic generator shall be removed and charged. A total of 8 discharges are applied to the surface of the specimen; and two discharges are applied to the grounding plate 100mm around the specimen. The time interval between each discharge is at least 1s. During the test, observe and record the working state of the specimen.
6.16.3.3 After the test, use the methods in 6.4.3 and 6.5.3 to detect the detection error and alarm error of the specimen.
6.17 Electrical transient pulse test (Alarm instrument with A.C. power supply only)
6.17.1 Purpose
Inspect the ability of the specimen to resist electrical transient pulse interference. 6.17.2 Requirements
The ability of the specimen to resist electrical transient pulse interference shall meet the requirements of 5.3.13.
6.17.3 Methods
6.17.3.1 Make the specimen in the normal monitoring state; and apply 2000 ?? (1??10%) V, frequency of 2.5 ?? (1 ??20%) kHz of polar transient pulse voltage (see Figure 3 for temperature environmental conditions.
6.18.2 Requirements
The performance of the specimen under high temperature environmental conditions shall meet the requirements of 5.3.16.
6.18.3 Methods
6.18.3.1 Install the specimen in the test chamber according to the normal working state; turn on the power; and make the specimen in the normal monitoring state for 20min. 6.18.3.2 Start the ventilator to stabilize the airflow velocity in the test chamber at 0.8m/s??0.2 m/s; and increase the temperature in the test chamber at a temperature rise rate of no more than 1??C/min stably for 2h to 55??C??2??C. Observe and record the state of the specimen.
6.18.3.3 According to the methods in 6.4.3 and 6.5.3 to detect the detection error and alarm error of the specimen.
6.19 Low temperature test
6.19.1 Purpose
Inspect the stability of the performance of the specimen when working under low- temperature environmental conditions.
6.19.2 Requirements
The performance of the specimen under low-temperature environmental conditions shall meet the requirements of 5.3.16.
6.19.3 Methods
6.19.3.1 Install the specimen in the test chamber according to the normal working state, turn on the power supply; and keep the specimen in the normal monitoring state for 20min.
6.19.3.2 Start the ventilator to stabilize the airflow velocity in the test chamber at 0.8m/s??0.2m/s; and set the temperature in the test chamber at a cooling rate of no more than 1??C/min to reduce to -10??C??2??C and keep it for 2h. Observe and record the state of the specimen.
6.19.3.3 According to the methods in 6.4.3 and 6.5.3 to detect the detection error and alarm error of the specimen.
6.20 Constant damp heat test
6.22 Drop test
6.22.1 Purpose
Inspect the adaptability of the specimen to withstand a drop.
6.22.2 Requirements
The performance of the specimen to withstand the drop shall meet the requirements of 5.3.18.
6.22.3 Methods
6.22.3.1 Drop the unpackaged specimen freely on a smooth, hard concrete surface. The drop height shall meet the following requirements:
a) The sample with a mass less than 1kg is 250 mm;
b) The sample with a mass of 1kg~10kg is 100 mm;
c) The sample with a mass of 10kg above is 50mm.
6.22.3.2 After the test, inspect the appearance of the specimen and the condition of the fastening part.
6.22.3.3 After the test, according to the methods in 6.4.3 and 6.5.3, detect the detection error and alarm error of the specimen.
7 Markings
7.1 Product markings
Each detection and alarm instrument shall have a clear and durable product marking, which shall include the following:
a) The name of the manufacturer;
b) Product name;
c) Product model;
d) The main technical parameters of the product (suitable for gas type, detection range, alarm setting value, etc.);
e) The mark of explosion-proof certificate;
f) The mark of the measurement certificate;
d) The results of the exit-factory inspection are quite different from the results of the previous type inspection;
e) A major quality accident occurred;
f) Requirements made by the quality supervision agency.
8.2.3 Two supplements are allowed in the type inspection, and the number of single supplements shall not exceed two.
9 Packaging, Transportation and Storage
9.1 Packaging
9.1.1 The product packaging shall meet the requirements of GB 4857.5. The instrument must be protected from mechanical damage during transportation and storage, and protected from moisture and dust.
9.1.2 The following technical documents shall be included in the packing box: a) Product qualification certificate;
b) Product instruction manual;
c) A list of product spare parts and accessories.
9.2 Transportation
The product shall be protected from rain, moisture, and strong vibration and impact during transportation.
9.3 Storage
The product shall be placed in a ventilated, dry, and non-corrosive room. The storage temperature is 0~40??C; and the relative humidity is lower than 85%.
10 Instruction Manual
Each detection and alarm instrument shall have a corresponding manual.
The manual shall have complete, clear and accurate safety instructions, installation and service instructions, and shall include the following:
a) Description of the implemented standards;
b) Measurement instructions;

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