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GB 12791-2006: Point type ultraviolet flame detectors
GB 12791-2006
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.220.20
C 81
Replacing GB 12791-1991
Point Type Ultraviolet Flame Detectors
ISSUED ON. JULY 17, 2006
IMPLEMENTED ON. APRIL 01, 2007
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 General Requirements... 5
4 Requirements and Test Methods... 7
5 Inspection Rules... 32
6 Markings... 33
Point Type Ultraviolet Flame Detectors
1 Scope
This Standard specifies the general requirements, requirements and test methods,
inspection rules and markings for point type ultraviolet flame detectors.
This Standard is applicable to point type ultraviolet flame detectors with a wavelength
range below 300 nm installed in general industrial and civil buildings. For point type
ultraviolet flame detectors with special properties installed in other environments, this
standard shall be implemented except that the special properties are specified
separately by 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 9969.1 General Principles for Preparation of Instructions for Use of Industrial
Products
GB 12978 Rules for Test of Fire Electronic Products
GB 16838 Environmental Test Methods and Severities for Fire Electronic Products
GB/T 17626.2-1998 Electromagnetic Compatibility - Testing and Measurement
Techniques - Electrostatic Discharge Immunity Test (idt IEC 61000-4-2.1995)
GB/T 17626.3-1998 Electromagnetic Compatibility - Testing and Measurement
Techniques - Radiated, Radio-Frequency, Electromagnetic Field Immunity Test (idt
IEC 61000-4-3.1995)
GB/T 17626.4-1998 Electromagnetic Compatibility - Testing and Measurement
Techniques - Electrical Fast Transient/Burst Immunity Test (idt IEC 61000-4-
4.1995)
GB/T 17626.5-1998 Electromagnetic Compatibility - Testing and Measurement
tools, ciphers or disconnection between probes and bases, and the like
measures.
b) When the manufacturer declares that a setting does not meet the requirements
of this Standard, such setting shall only be implemented by means of special
tools and ciphers; and it shall be clearly indicated on the detector or related
documents that such setting cannot meet the requirements of this Standard.
3.6 Detachable detector
When the probe of the detachable detector is separated from the base, it shall provide
identification means for the control and indication equipment to send out fault signals.
3.7 Requirements for control software
3.7.1 General
For detector that rely on software control and meet the requirements of this Standard,
it shall meet the requirements of 3.7.2, 3.7.3, and 3,7.4.
3.7.2 Software files
3.7.2.1 The manufacturer shall submit software design information. The information
shall have sufficient content to prove that the software design meets the requirements
of this Standard and shall include at least the following.
a) Functional description of main program (such as flow chart or structure diagram),
including.
--- Main description of each module and its function;
--- The way in which the modules interact;
--- All levels of the program;
--- The way the software interacts with the detector hardware;
--- The way the module is called, including the interrupt process.
b) Memory address allocation (such as program, specific data and operation data).
c) The unique identification of the software and its version.
3.7.2.2 If the inspection requires, the manufacturer shall be able to provide detailed
design documents containing at least the following.
a) Overview of the overall system configuration, including all software and hardware
components.
4.1.1 Atmospheric conditions of the test
Unless otherwise stated in the relevant provisions, all tests are conducted under the
following atmospheric conditions.
--- Temperature. 15°C ~ 35°C;
--- Humidity. 25% RH ~ 75% RH;
--- Atmospheric pressure. 86 kPa ~ 106 kPa.
4.1.2 Normal monitoring status of the test
If the test method requires the detector to work under normal monitoring status, the
sample shall be connected to the control and indication equipment provided by the
manufacturer; when there are no special requirements in the relevant provisions, the
working voltage of the detector should be guaranteed to be rated working voltage, and
keep the working voltage stable during the test.
NOTE. The test report of the detector shall indicate the type and manufacturer of the control
and indication equipment that the detector is connected to during the test.
4.1.3 Installation of the detector
The detector shall be installed according to the normal installation method specified by
the manufacturer. If the instruction manual gives a variety of installation methods, the
most unfavorable installation method shall be used in the test.
4.1.4 Tolerance
Unless otherwise stated in the relevant provisions, the tolerance of each test data is
±5%; the deviation of environmental condition parameters shall meet the relevant
provisions of GB 16838.
4.1.5 Test sample (hereinafter referred to as sample)
10 sets of detectors, which are numbered before the test.
4.1.6 Inspect before test
4.1.6.1 The sample shall be conducted the appearance inspection before the test, and
shall meet the following requirements.
a) No corrosion, peeling and blistering on the surface, no obvious scratches, cracks,
burrs and other mechanical damage;
b) There is no looseness in the fastening part.
4.2 Measurement of response threshold
4.2.1 Purpose
Measure the response threshold of the detector.
4.2.2 Equipment
The ultraviolet flame sample detection device is a special equipment, which is
composed of optical orbit, ultraviolet light source, dimmer glass, shutter, modulator,
sample holder and other related components (as shown in Figure 1). The equipment
should meet the test requirements of 4.2, 4.4 ~ 4.8.
4.2.2.1 Optical orbit
The main technical parameters.
Length. 2m;
Straightness. less than 0.04mm.
4.2.2.2 Ultraviolet light source
The ultraviolet light source uses a flame produced by the combustion of methane with
a purity of no less than 99.9%. During the test, the variation of the radiant energy of
the light source shall be no greater than ± 5%.
4.2.2.3 Dimmer glass
The dimmer glass plays the role of attenuating ultraviolet radiation. Neutral ultraviolet
dimmer glass is used in this detection device, which can pass ultraviolet radiation with
a wavelength greater than 200nm and less than 300nm, and its transmittance depends
on the specific test requirements.
4.2.2.4 Modulator (optional)
The modulator is composed of a chopper and a DC motor. The DC motor drives the
chopper to rotate at a desired frequency to modulate the radiation generated by the
flame combustion (as shown in Figure 2).
this point and the light source, that is, the Value-D of the sample response point.
According to opt...