1 Scope
This program of pattern evaluation applies to the combustible-gas alarm detectors (including combustible gas detector, hereinafter referred to as "detector") used in non-shaft operating environment and civil place.
2 Normative References
JJG 693-2011 "Alarm Detectors of Combustible Gas"
GB 12358-2006 "Gas Monitors and Alarms for Workplace-General Technical Requirements"
GB 15322-2003 "Combustible Gas Detector"
GB 16808-2008 "Combustible Gas Alarm Control Units"
GB/T 17626.2-2006 "Electromagnetic Compatibility(EMC) -- Testing and Measurement Techniques -- Electrostatic Discharge Immunity Test"
GB/T 17626.3-2006 "Electromagnetic Compatibility-Testing and Measurement Techniques-Radiated Radio-frequency Electromagnetic Field Immunity Test"
GB/T 17626.4-2008 "Electromagnetic Compatibility-Testing and Measurement Techniques-Electrical Fast Transient/Burst Immunity Test"
The following normative documents contain provisions which, through reference in this program, constitute provisions of this program. For dated references, subsequent amendments to (excluding any correction), or revisions of, any of these publications do not apply. However, parties to agreements based on this program are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
3 General
The detector is divided into catalytic combustion type, thermal conductivity type, semiconductor type and infrared absorption type according to the test principle or diffusion type and inhalation type according to sampling type or portable type and fixed type according to usage mode. The detector mainly consists of detecting element, amplifying circuit, alarm system and displayer and is used to monitor the concentration of combustible gas exist in the environment.
4 Technical Data and Experimental Prototype Submitted by Application Unit
4.1 Technical Data
a) Prototype photo;
b) Product standard (including inspection method);
c) General assembly drawing, drawing of vital parts and circuit diagram;
d) Instruction for use;
e) Test report by manufacturer or technical organization;
f) Explosion proof certificate.
4.2 Experimental Prototype
The application unit shall provide the prototypes it produced and file an application for a single product or series products. In case of application for a single product, three prototypes shall be provided generally and six fixed prototypes shall be provided, in which any three is used for the long-term stability test. In case of application for series product, one third of the products with representative specifications are sampled out of each series of products; the experimental prototypes provided for each specification shall comply with the principle of one application form to one product; the excess prototypes may be decreased when using the principle above.
5 Legal Management Requirements
5.1 Requirements for Measurement Unit
The detector shall adopt the legal measurement units.
5.2 Requirements for Accuracy (Maximum Permissible Error)
The maximum permissible error of the detector shall comply with JJG 693-2011 "Alarm Detectors of Combustible Gas".
5.3 Requirements for Legal Measurement Marking and Measuring Devices Identification
The legal measurement marking and measuring device identification shall be indicated on the detector which can be easily seen, such as nameplate, panel and gauge-head and the marking, serial number and description must be clearly distinguishable and firmly reliable.
5.3.1 The legal measurement marking generally includes:
——License marking and serial number for manufacturing and measuring devices (the position shall be reserved for the experimental prototype of domestic detector);
——Approved marking and serial number for measuring devices type (the position may be reserved for the experimental prototype, which is optional).
5.3.2 The measuring device identification generally includes:
——Detector name, manufacturer name, specification (model), manufacturing date, delivery number;
——Blast-proof Ex marking and serial number.
5.4 Requirements for Installation Marking
The detector whose accuracy will be affected by the improper installation, shall be provided with the installation instructions marking.
5.5 Other Requirements
Comply with other relevant legal management requirements.
6 Measuring Requirements
The measuring requirements are detailed in Table 1.
Introduction I
1 Scope
2 Normative References
3 General
4 Technical Data and Experimental Prototype Submitted by Application Unit
4.1 Technical Data
4.2 Experimental Prototype
5 Legal Management Requirements
5.1 Requirements for Measurement Unit
5.2 Requirements for Accuracy (Maximum Permissible Error)
5.3 Requirements for Legal Measurement Marking and Measuring Devices Identification
5.4 Requirements for Installation Marking
5.5 Other Requirements
6 Measuring Requirements
7 General Technical Requirements
7.1 Appearance
7.2 Alarm Function and Alarm Operate Value
7.3 Long Term Stability (Applicable only to Detector with Fixed Installation)
7.4 Adaptability of Supply Voltage
7.5 Requirements for Secure Environment
7.6 Requirements for Climatic Environment
7.7 Requirements for Mechanical Environment
7.8 Requirements for Electromagnetic Compatibility
8 List of Pattern Evaluation Items
9 Test Methods and Condition for Test Items
9.1 Measuring Requirements
9.2 General Technical Requirements
10 Judgment and Treatment of Pattern Evaluation Result
11 Original Records Form for Pattern Evaluation
Appendix A Original Records Form for Pattern Evaluation of Combustible-gas Detectors
