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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
...