GB 12791-2006 PDF in English
GB 12791-2006 (GB12791-2006) PDF English
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Point type ultraviolet flame detectors
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| GB 12791-1991 | English | 759 |
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Performance requirements and test methods for point ultraviolet flame detectors
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Standards related to (historical): GB 12791-2006
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GB 12791-2006: PDF in English 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 optical principles, the square of the distance D between the sample
response point and the light source is inversely proportional to the effective power S
radiated by the light source to the sample sensing surface, namely.
S = K/D2 (K is transformation constant)
For samples with random response characteristics, the response threshold must be
measured repeatedly for at least 6 times until the next change in the response
threshold does not exceed 10% of the average value of the response thresholds of the
previous measurements.
For samples with flicker frequency requirements, the modulator must be adjusted to
the flicker frequency specified by the manufacturer (including 0).
4.2.3.3 Calculation of the response threshold ratio
Compare the two measured response thresholds, the maximum value is Smax, the
minimum value is Smin; they correspond to Dmax and Dmin, respectively. The response
threshold ratio is Smax. Smin = D2 max. D2 min.
4.3 Conformance test
4.3.1 Purpose
Check the conformance of the response threshold distribution of the detector.
4.3.2 Test methods
According to the method specified in 4.2.3, measure the Value-D of the response
points of 10 samples, respectively; thereof, the maximum value is Dmax and the
minimum value is Dmin; calculate the response threshold ratio of Smax. Smin.
4.3.3 Requirements
The response threshold ratio of Smax. Smin shall be no greater than 2.0.
4.3.4 Equipment
Ultraviolet flame sample detection device.
4.4 Repeatability test
4.4.1 Purpose
Check the stability of the detector for continuous operation.
measure the Value-D of the response point of the sample according to the method
specified in 4.2.3; and compare it with the Value-D of the response point of the sample
in the consistency test; thereof, the maximum value is Dmax, while the minimum value
is Dmin; and calculate the response threshold ratio of Smax. Smin.
4.6.3 Requirements
During the test, the sample shall not emit a fire alarm signal or a fault signal; after the
test, the response threshold ratio of Smax. Smin shall be no greater than 1.3.
4.6.4 Test equipment
Ultraviolet flame sample detection device
4.7 Power parameter fluctuation test
4.7.1 Purpose
Check the adaptability of the detector to changes in power supply parameters.
4.7.2 Test method
Respectively, reduce 15% and increase 10% of the working voltage of the sample
against the rated voltage; and measure the Value-D of response point according to the
method specified in 4.2.3; compare it with the Value-D of the response point of the
sample in the conformance test, among the three of which, the maximum value is Dmax
and the minimum value is Dmin; and calculate the response threshold ratio of Smax. Smin.
4.7.3 Requirements
During the test, the sample shall not emit a fire alarm signal or a fault signal; after the
test, the response threshold ratio of Smax. Smin shall be no greater than 1.6.
4.7.4 Equipment
Ultraviolet flame sample detection device.
4.8 Environmental light interference test
4.8.1 Purpose
Check the stability of the detector performance under environmental light.
4.8.2 Test method
4.8.2.1 Installation of sample
Place the environmental light interference simulation device between the light source
response threshold ratio of Smax. Smin.
4.8.3 Requirements
During the test, the sample shall not emit a fire alarm signal or a fault signal; the
response threshold ratio of Smax. Smin shall be no greater than 1.6; after the test, the
sample response threshold ratio of Smax. Smin shall be no greater than 1.3.
4.8.4 Test equipment
Ultraviolet flame sample detection device, environmental light interference simulation
device.
4.9 High temperature (operation) test
4.9.1 Purpose
Check the adaptability of the detector used under high temperature conditions.
4.9.2 Test method
4.9.2.1 Place the sample and its base in the high-temperature test chamber, and switch
on the control and indication equipment to make it in the normal monitoring status.
4.9.2.2 Under the condition of a temperature at 23°C ± 5°C, raise the temperature to
55°C ± 2°C at a temperature-rise rate of no more than 0.5°C/min; and keep it under
this condition for 2h. During the test, observe and record the working state of the
sample.
4.9.2.3 After the test, take out the sample and place it under normal atmospheric
conditions for 1h. Then measure the Value-D of the response point according to the
method specified in 4.2.3, and compare it with the Value-D of the sample in the
conformance test; thereof, the maximum value is Dmax, and the minimum value is Dmin;
calculate the response threshold ratio of Smax. Smin.
4.9.3 Requirements
During the test, the sample shall not emit a fire alarm signal or a fault signal; after the
test, the sample shall be free of coating damage and corrosion; and the response
threshold ratio of Smax. Smin shall be no greater than 1.3.
4.9.4 Test equipment
The test equipment shall comply with the relevant provisions of GB 16838.
4.10 Low temperature (operation) test
4.10.1 Purpose
conformance test; thereof, the maximum value is Dmax, and the minimum value is Dmin;
and calculate the response threshold ratio of Smax. Smin.
4.11.3 Requirements
During the test, the sample shall not emit a fire alarm signal or a fault signal; after the
test, the sample shall be free of coating damage and corrosion; and the response
threshold ratio of Smax. Smin shall be no greater than 1.3.
4.11.4 Test equipment
The test equipment shall comply with the relevant provisions of GB 16838.
4.12 Constant damp heat (durability) test
4.12.1 Purpose
Check the ability of the detector to withstand high humidity environment.
4.12.2 Test method
4.12.2.1 Place the sample and its base in the damp heat test chamber.
4.12.2.2 Adjust the damp heat test chamber, and keep the sample for 21d under the
conditions of temperature at 40°C ± 2°C and relative humidity 93% ± 3%.
4.12.2.3 After the test, take out the sample and place it under normal atmospheric
conditions for 1h. Then measure the Value-D of the response point according to the
method specified in 4.2.3; and compare it with the Value-D of the sample in the
conformance test; thereof, the maximum value is Dmax, and the minimum value is Dmin;
calculate the response threshold ratio of Smax. Smin.
4.12.3 Requirements
The sample shall meet the following requirements.
a) When returning to the normal monitoring state, the sample shall not issue a fire
alarm signal or a fault multiple;
b) After the test, the sample shall be free of coating damage and corrosion; and the
response threshold ratio of Smax. Smin shall be no greater than 1.6.
4.12.4 Test equipment
The test equipment shall comply with the relevant provisions of GB 16838.
4.13 Corrosion test
DC voltage between the short-circuit position and the metal plate for 60s ± 5s. Then
measure the insulation resistance.
4.14.2.2 Place the sample in a drying cabinet at a temperature of 40°C ± 2°C and dry
it for 6h; Keep it in the damp heat test chamber for 4d at the temperature of 40°C ±
2°C and relative humidity of 93% ± 3%. Then place it under normal atmospheric
conditions for 1h, and measure the insulation resistance as described above.
4.14.3 Requirements
The insulation resistance between the externally charged terminal of the sample and
the enclosure shall be no less than 100MΩ under normal atmospheric conditions; and
it shall be no less than 1MΩ in an environment with a temperature of 40°C ± 2°C and
a relative humidity of 93% ± 3%.
4.14.4 Test equipment
Main technical parameters of insulation resistance test device are as follows.
a) Test voltage. DC 500 × (1 ± 0.1) V (the ground is a metal plate);
b) Measuring range. 0 ~ 500MΩ;
c) Minimum division. 0.1MΩ;
d) Timing time. 60s ± 5s.
NOTE. When there is no special test device, it may also be measured by a megohmmeter or a
megger.
4.15 Withstand voltage test
4.15.1 Purpose
Check the withstand voltage performance of the detector.
4.15.2 Test method
4.15.2.1 Place the sample in a damp heat test chamber with a temperature of 25°C ±
2°C and a relative humidity of no more than 70% for 24 h.
4.15.2.2 After taking out, install the sample and its base on a metal plate (voltage
ground) of the withstand voltage test equipment; and then short-circuit all the contacts
of the sample to each other; and apply test voltage between the short-circuit position
and the metal plate according to the following requirements.
a) When the effective value of the rated working voltage of the sample does not
exceed 50V. the test voltage rises from 0V to 500 × (1 ± 0.1) V at a boost rate of
4.16.4 Test equipment
The test equipment shall comply with the provisions of GB 16838
4.17 Vibration (sinusoidal) (durability) test
4.17.1 Purpose
Check the ability of the detector to withstand the effects of vibration for a long time.
4.17.2 Test method
4.17.2.1 Fix the sample and its base on the vibration test bench.
4.17.2.2 Separately conduct 20 times of sweep-frequency cycle on three mutually
perpendicular axes in turn, within the frequency cycle range of 10Hz~150Hz, with an
acceleration amplitude of 10 m/s2 and a sweep rate of 1 oct/min.
4.17.2.3 After the test, measure the Value-D of the response point according to the
method specified in 4.2.3; compare it with the Value-D of the sample in the
conformance test; thereof, the maximum value is Dmax, and the minimum value is Dmin;
and calculate the response threshold ratio of Samx. Smin.
4.17.3 Requirements
The sample shall meet the following requirements.
a) When returning to the normal monitoring state, the sample shall not emit a fire
alarm signal or a fault signal;
b) After the test, the sample shall be free of mechanical damage and looseness of
the fastening parts. The response threshold ratio of Samx. Smin shall be no greater
than 1.3.
4.17.4 Test equipment
The test equipment shall comply with the provisions of GB 16838.
4.18 Shock test
4.18.1 Purpose
Check the anti-interference ability of the detector against non-recurring mechanical
shock.
4.18.2 Test method
4.18.2.1 Fix the sample and its base on the impact test bench, and switch on the control
4.19.4 Test equipment
The main body of the collision test device (shown in Figure 4) is a pendulum
mechanism. The hammer head of the pendulum is made of hard aluminum alloy
AlCu4SiMg (after solid solution and aging treatment); and the shape is a hexahedron
with an inclined collision surface. The swing bar of the hammer head is fixed on a steel
hub with a ball bearing; and the ball bearing is mounted on a fixed steel shaft of a hard
steel frame. The structure of the hard steel frame shall ensure that the pendulum may
rotate freely when the sample is not installed.
The external dimensions of the hammer head are 94mm long, 76mm wide and 50mm
high; and the mass is about 0.79kg. The angle between the diagonal plane of the
hammer head and the longitudinal axis is 60° ± 1°. The outer diameter of the swing bar
of the hammer head is 25mm ± 0.1mm, and the wall thickness is 1.6mm ± 0.1mm.
The radial distance of the longitudinal axis of the hammer head from the rotation axis
is 305mm; and the axis of the swing rod of the hammer head must be perpendicular to
the axis of rotation. Steel wheel hubs with an outer diameter of 102mm and a length of
200mm are assembled concentrically on a steel shaft with a diameter of 25mm. The
accuracy of the steel shaft diameter depends on the dimensional tolerances of the
used bearings.
Two steel counterweight arms with an outer diameter of 20mm and a length of 185mm
are installed in the opposite direction of the steel wheel hub and the swing bar; and the
extension length is 150mm. Install an adjustable counterweight block on the two
counterweight arms to balance the hammer head and the counterweight arm. Install
an aluminum alloy pulley with a thickness of 12mm and a diameter of 150mm on one
end of the steel wheel hub. Wrap a cable around the pulley. One end of the cable is
fixed to the pulley and the other end is attached with a working hammer; the mass of
the working hammer is about 0.55 kg.
The horizontal mounting plate for mounting the sample is supported by the steel frame;
and the mounting plate can be adjusted up and down, so that the center of the collision
surface of the hammer head hits the sample from the horizontal direction.
When using the test equipment, first adjust the positions of the sample and mounting
plate according to Figure 4.After adjustment, fix the mounting plate on the steel frame;
then take off the working hammer; and balance the pendulum mechanism by adjusting
the counterweight block. After adjusting the balance, pull the swing bar to a horizontal
position and attach a working hammer. When the pendulum mechanism is released,
the working hammer rotates the hammer head by 270° to hit the sample.
During the test, the sample shall not emit an alarm signal or an unrecoverable fault
signal; after the test, the sample response threshold ratio of Smax. Smin shall be no
greater than 1.3.
4.24.4 Test equipment
The test equipment shall meet the relevant provisions of GB/T 17626.5-1999.
4.25 Fire sensitivity test
4.25.1 Purpose
Check the response performance of the detector under test fire conditions.
4.25.2 Test method
4.25.2.1 Fix the four samples in parallel at a height of 1.5m ± 0.1m, and isolated from
the test fire; switch on the control and indicating equipment to make them under normal
monitoring state.
Ignite the test fire, after a period of stable radiation, remove the spacer and start timing.
The distance between the sample and the test fire center, during the test, is 12m, 17m
and 25m, respectively.
4.25.2.2 N-heptane fire
a) Fuel. N-heptane (analytical reagent grade), add 3% (V / V) toluene;
b) Mass. 650g;
c) Arrangement. Place the fuel in a container made of 2mm-thick steel plate, with a
bottom size of 33 cm × 33 cm and a height of 5 cm.
d) Ignition method. flame or electric spark.
4.25.2.3 Open flame of ethanol
a) Fuel. Industrial ethanol (ethanol content above 90%, with a small amount of
methanol);
b) Mass. 2000g;
c) Arrangement. Place the fuel in a container made of 2-mm thick steel plate, with
a bottom size of 33 cm × 33 cm and a height of 5 cm;
d) Ignition method. flame or electric spark.
4.25.3 Requirements
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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