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GB 12358-2006: Gas monitors and alarms for workplace -- General technical requirements
GB 12358-2006
GB
NATIONAL STANDARD OF THE
PEOPLE?€?S 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?€?s
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 e...