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GB 13486-2014: [GB/T 13486-2014] Portable heating catalytic methane alarm detector
Status: Valid GB 13486: Evolution and historical versions
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PDF similar to GB 13486-2014
Basic data | Standard ID | GB 13486-2014 (GB13486-2014) | | Description (Translated English) | [GB/T 13486-2014] Portable heating catalytic methane alarm detector | | Sector / Industry | National Standard | | Classification of Chinese Standard | N21 | | Classification of International Standard | 13.320 | | Word Count Estimation | 14,145 | | Date of Issue | 12/12/2014 | | Date of Implementation | 11/1/2015 | | Older Standard (superseded by this standard) | GB 13486-2000 | | Quoted Standard | GB/T 191; GB/T 2423.1-2008; GB/T 2423.2-2008; GB/T 2423.4-2008; GB/T 2423.5; GB/T 2423.8; GB/T 2423.10-2008; GB/T 2829; GB 3836.1-2010; GB 3836.2-2010; GB 3836.4-2010; GB 4208-2008; GB/T 9969; AQ 1043-2007; MT 210 | | Regulation (derived from) | National Standards Bulletin 2014 No. 30 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Standard specifies the use of portable thermal catalytic coal mine methane detection alarm terms and definitions, types, classification, models, basic parameters and conditions, technical requirements, test methods, inspection rules, marking, packagi | GB 13486-2014: [GB/T 13486-2014] Portable heating catalytic methane alarm detector---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Portable heating catalytic methane alarm detector
ICS 13.320
N21
National Standards of People's Republic of China
Replacing GB 13486-2000
Portable thermal catalytic methane detection alarm
Issued on. 2014-12-22
2015-11-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
All technical contents of this standard is mandatory.
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
This standard replaces GB 13486-2000 "portable thermal catalytic methane detection alarm."
This standard compared with GB 13486-2000, the main technical changes are as follows.
--- Increased security provisions content explosion, and explosion-proof security provisions are classified and refinement (see 5.21);
--- Add "display value stability" clause (see 5.10.1);
--- Increasing the "insulation resistance" and "dielectric strength" clause (see 5.12 and 5.13);
--- Remove the "instrument category" (see 2000 edition 4.1);
--- Remove the instrument measuring range "(0 ~ 3)% CH4" [see 2000 edition of 4.3.1a)];
--- "Instrument run continuously 7d (working day 9h)," adjusted to "alarm continuously 15d (working day 10h)," (see
. 58, 2000 edition of 5.14);
--- Instrument response time by "30s" adjusted "20s" (see 59, 2000 edition 5.11.);
--- Alarm "alarm sound level intensity from its 1m distance should not be less than 80dB (A)" adjusted "alarm sound level intensity from its
1m distance should not be less than 75dB (A) "[see 5102, 2000 edition of 5.12b)..];
--- Alarm error test "(0.50 ~ 1.00)% CH4 error. ± 0.10, ( > 1.00 ~ 2.00)% CH4 error. true value
± 10% "adjustment" Delta Alarm display value and set value should not exceed ± 0.05% CH4 "requirement (see 5.10 1, 2000 edition
5.9);
--- Working Hours Test Method Central Plains "Last 10min check the instrument zero" to "run 9.5h, check the instrument zero
Point "(see 68, 2000 edition 6.12.);
--- Damp heat test cycle consists of "2d" to "6d" (see 618, 2000 edition 6.17.);
--- Winds affect the test method has been modified (see 6.15, 6.14, 2000 edition).
Please note that some of the content of this document may involve patents. Release mechanism of the present document does not assume responsibility for the identification of these patents.
This standard is proposed and managed by the China Coal Industry Association.
This standard by the Institute of Shenyang Coal Group Co., Ltd. Yangzhong City Nanfang Mine Electric Co., Ltd., Shandong Longtai Mining Equipment Co.
Division is responsible for drafting.
The main drafters of this standard. Fu Shuling, Tang Yong, Lee's, Fu Wenjun, Lizhong Jiang, Li Zhen West, Yuan Liqing, Wang, Yi Liu Ping, Liu Yajun,
Zhang Fang and so on.
This standard replaces the standards previously issued as follows.
--- GB 13486-1992, GB 13486-2000.
Portable thermal catalytic methane detection alarm
1 Scope
This standard specifies a portable hot catalytic coal mine methane detection alarm of terms and definitions, type, category, type, basic parameters and make
Condition, technical requirements, test methods, inspection rules, marking, packaging, storage and so on.
Note. Mine portable thermal catalytic methane alarm detector applicable to the coal mine methane and coal dust explosive gas mixtures.
This standard applies to class Ⅰ explosive environments portable thermal catalytic methane alarm detector (hereinafter referred to as Alarm).
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 191 Packaging - Pictorial signs
GB/T 2423.1-2008 Environmental testing for electric and electronic products Part 2. Test methods Test A. Cold
GB/T 2423.2-2008 Environmental testing for electric and electronic products Part 2. Test methods Test B. Dry heat
GB/T 2423.4-2008 Environmental testing for electric and electronic products Part 2. Test methods - Test Db. Damp heat (12h
12h cycle)
GB/T 2423.5 Environmental testing for electric and electronic products Part 2. Test methods Test Ea and guidance. Shock
GB/T 2423.8 Environmental testing for electric and electronic products Part 2. Test methods Test Ed. Free fall
GB/T 2423.10-2008 Environmental testing for electric and electronic products Part 2. Test methods Test Fc. Vibration (sinusoidal)
GB/T 2829 periodic inspection Sampling procedures and tables (suitable for process stability test)
GB 3836.1-2010 explosive atmospheres - Part 1. General requirements for equipment
GB 3836.2-2010 explosive atmospheres - Part 2. the flameproof enclosure "d" protection equipment
GB 3836.4-2010 Explosive atmospheres - Part 4. the intrinsically safe "i" protection equipment
GB 4208-2008 shell protection (IP code)
GB/T 9969 General Instructions industrial products
AQ1043-2007 mining product safety signs logo
MT210 Coal communication, detection, control the basic test methods for electric and electronic products
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
Display value displayvalue
Measured value by the alarm of the monitor display.
3.2
Zero zeropoint
Alarm display value work in the fresh air when.
3.3
Calibration points demarcationpoint
Alarm to meet the measurement accuracy of the selected sample calibration gas concentration display.
3.4
Alarm alarmpoint
Alarm activated alarm value based on the requirements set in advance.
3.5
Basic error basicerror
Under normal test conditions determined Alarm measured error value.
3.6
Stability of stability
In the working conditions and the time specified, the instrument zero calibration point and alarm point maintain performance within the allowable variation range.
4 model named
Alarm named the following manner.
JCB 4 (*)
Reference design changes. The A, B, C represents
Measuring range. 0 ~ 4% CH4
Structural features. Portable
Measuring method. thermal catalytic
Product Type. Methane
5 Technical requirements
5.1 General Requirements
5.1.1 Alarm shall comply with the provisions of this standard, in accordance with prescribed procedures approved manufacturing drawings and technical documents.
5.1.2 Alarm measuring range. 0.00% CH4 ~ 4.00% CH4.
5.1.3 Alarm mine explosion-proof type is intrinsically safe and explosion-proof.
5.2 Working conditions
Alarm should be able to work under the following conditions.
a) Ambient temperature. 0 ℃ ~ 40 ℃;
b) Relative humidity. ≤95% (at 25 ℃);
c) Atmospheric pressure. 80kPa ~ 106kPa;
d) Winds. ≤8m/s;
e) use in explosive gas mixture of methane and coal dust ﹑ but no damage to the insulation of the corrosive gas environments.
5.3 Storage temperature
Storage temperature is -40 ℃ ~ 60 ℃.
5.4 Appearance and structure
5.4.1 Alarm should display the value of the polarity flag.
5.4.2 Alarm proper voltage automatic power off function and anti-shock measures high concentration of methane.
5.4.3 Alarm should be reasonable structure, durable, easy to operate and adjust, ease of maintenance and portable, and can effectively resist dust, moisture,
interference.
5.4.4 alarm meter surface, plating or coating should not have bubbles, cracks, flaking and obvious spots. Alarm internal components should be installed welding
Solid, reasonable neat layout.
5.4.5 Alarm escutcheon should observe good light transmission, meter, digital, symbols should be clear and intact.
5.4.6 Alarm with jacket, jacket openings shall apply reasonable, easy to operate and from different directions to observe the optical signal alarm
And outgoing alarm signal.
5.5 charging function
Alarm and supporting the use of the charger, charging indicator shall function and overcharge protection.
5.6 basic error
Basic error alarm should meet the requirements in Table 1.
Table 1 basic error
Measuring gas
Measuring range
% CH4
Basic error
% CH4
Methane in air 0.00 ~ 1.00 ± 0.10
Methane in air 1.00 to 3.00 true value ± 10%
Methane in air 3.00 ~ 4.00 ± 0.30
5.7 Working Time Test
Working time alarm should charge less than 10h. During normal working hours, alarm undervoltage shutdown, zero, alarm point should not be
5.6,5.10.1 of compliance.
5.8 job stability
Alarm continuously 15d (daily working 10h), which shall conform to the basic error of 5.6.
5.9 Response Time
Alarm methane response time should not exceed 20s.
5.10 Alarm
5.10.1 Alarm should be able to arbitrarily set the methane gas alarm points within 0.50% CH4 ~ 2.00% CH4 range, alarm display value with the set value
The difference shall not exceed ± 0.05% CH4.
5.10.2 alarm sound level intensity from its 1m distance should not be less than 75dB (A).
5.10.3 alarm signal light in the dark visibility shall not be less than 20m.
5.11 Change work location
Alarm when deviation from the normal operating position of a predetermined state, an additional error of the displayed value or alarm point arising in the range ± 0.03% CH4
Around inside.
5.12 Insulation resistance
Alarm between intrinsically safe circuits and housing, under normal insulation resistance should be not less than 50MΩ; after alternating hot and humid test, not less than
1.5MΩ.
5.13 Dielectric strength
Alarm should be able to withstand between intrinsically safe circuits and housing 500V, 50Hz, lasted 1min power frequency voltage test without breakdown and flashover
Phenomenon, leakage current less than 5mA.
5.14 Effect of wind speed
When the alarm test at 8m/s wind speed conditions, which shows the amount of drift value shall not exceed ± 0.10% CH4.
5.15 Operating Temperature
Alarm After working temperature test, the basic error should be consistent with the provisions of 5.6.
5.16 Storage temperature
Alarm After storage temperature test, the basic error should be consistent with the provisions of 5.6.
5.17 Damp heat
After the alarm by alternating hot and humid test, the insulation resistance, dielectric strength and fundamental error should be consistent with the provisions of 5.12, 5.13 and 5.6.
5.18 Vibration Test
Alarm After the vibration test, connectors, parts should be no loose and fall off, and shall comply with the provisions of the basic error of 5.6.
5.19 Impact test
Alarm After the impact test, should be no damage, connectors, parts should be no loose and fall off, and shall comply with the provisions of the basic error of 5.6.
5.20 Drop Test
After the alarm after the drop test, connectors, parts should be no loose and fall off, and shall comply with the basic error of 5.6, and should not be
Affect any deformation and damage of the explosion-proof performance.
5.21 Explosion-proof requirements
5.21.1 Alarm should be mine explosion-proof and intrinsically safe explosion-proof structure, and satisfy GB 3836.1-2010, GB 3836.2-2010,
The provisions of GB 3836.4-2010.
5.21.2 Alarm in any element and intrinsic safety related, should comply with GB 3836.4-2010 in Chapter 7.
5.21.3 Alarm shell protection performance should be consistent with the provisions of GB 4208-2008 in the degree of protection IP54.
5.21.4 Alarm If non-metallic materials for the housing, and the maximum surface area greater than 100cm2, its surface should be anti-static treatment to
Surface insulation resistance should not exceed 1GΩ or animal wearing a holster when underground use.
5.21.5 Alarm should be prescribed by GB 3836.4-2010 spark ignition tests.
5.21.6 Alarm under normal and fault conditions, the shell, wires and components maximum surface temperature should not exceed 150 ℃.
5.21.7 Alarm shell (battery encapsulation) structure, creepage distances, clearances and spacing in line with GB 3836.4-2010 in Chapter 6
Provisions.
5.21.8 Alarm power cell or battery shall comply with the provisions in 7.4 GB 3836.4-2010.
6 Test methods
6.1 test environment condition
Test normal atmospheric conditions.
a) Temperature. 15 ℃ ~ 35 ℃;
b) Relative humidity. 45% ~ 75%;
c) Atmospheric pressure. 86kPa ~ 106kPa.
6.2 Test of measuring instruments
6.2.1 The level of accuracy is not less than 4.0 meter; sound level meter resolution is not less than 1dB (A); stopwatch division value not greater than 0.1s.
6.2.2 Test sample gas sample gas should be used by the national metrology department assessment certification unit provided with an uncertainty of less than 3%. The test
The gas sample shall conform to the requirements of Table 2. Test, the instrument warm-up time, charging time, and the flow of gas samples according to instrument technology file
Seek OK.
Table 2 Test gas sample
Pilot projects
And the range of the desired gas sample
% CH4
Basic error test 0.50,1.00,1.50,3.50
Response time test 2.00 ± 0.10
Alarm error test 1.20
Note. The value of the standard gas and allow departing from the value specified in Table gas shall not exceed ± 10%.
6.3 Appearance and structure
With sensory test.
6.4 charging function tests
First alarm to discharge critical voltage condition, and then the charging instrument. After charging, check the charging and charging effect.
6.5 Basic error test
Its zero point calibration and calibration point (hereinafter referred to as calibration alarm). Press the appropriate sample gas alarm device selection range listed in Table 2 by the low
Followed by concentration to high concentration tested. Each gas sample measured 4 times (each measurement 1min, recovery time in the air less than 1min), take
Three times as the arithmetic average of the measured values and the difference between the gas sample, that is, the basic error. Automatic intermittent operation Alarm their prescribed week
Of testing.
Test apparatus Appendix A. Error according to equation (1).
δ =
i = 2
Di
n-1-
D (1)
Where.
D --- standard gas samples,% CH4;
DI --- a measured value,% CH4;
n --- number of measurements.
6.6 Alarm error test
Are first set point to 1.0% CH4 alarm and 1.5% CH4, successively pass into the gas samples specified in Table 2, recording the corresponding alarm alarm
The gas samples. Each gas sample measured 4 times (each measurement 1min, recovery time in the air less than 1min), 3 times the arithmetic average
The difference between value and set the alarm as an alarm error.
6.7 Response Time Trial
Response time test as follows.
a) Calibration alarm, access set forth in Table 2, the gas sample, recording alarm stable value;
b) After washing with fresh air alarm device, quickly passed into said gas sample, and start the timer, alarm display original recording stable value of 90%
time;
c) measuring 4 (1min each measurement, the recovery time of less than 1min in air), the arithmetic average of three times after taking, namely ring
It should be time.
6.8 Working Time Test
6.8.1 After the rechargeable battery is fully charged after normal working 9.5h, the test measurement point and alarm indication error.
6.8.2 Disposable batteries can be replaced by a day of work 10h, according to equation (2).
D =
I × 10
(2)
Where.
D --- working time in days (d);
C --- battery capacity in ampere hours (A · h);
I --- operating current in amperes (A).
6.8.3 Calibration Alarm, Alarm run 9.5h. Zero, alarm, undervoltage condition, showing error checking instrument. Indication error calculation
Carried out according to the method specified in 6.5.
6.9 Insulation resistance test
Insulation resistance according to the method specified in MT210 performed.
6.10 Dielectric strength test
MT210 according to the method prescribed conduct.
6.11 working position change test
Alarm use their position calibration predetermined alarm zero, which leads to 2.00% CH4 gas sample, 1min was recorded after the alarm is working correctly
For the position of the display. Then, the alarm deviation from the normal operating position 45 °, and 45 ° along the rotation axis, the recording and the normal operating position
The maximum difference between the displayed value, additional error alarm as working position of influence.
6.12 sound level strength test
Under conditions of ambient noise is not greater than 30dB (A), so alarm the alarm, at a distance of 1m far from the center of the instrument Xiangqi measure the sound level
Strength, measured three times and averaged.
6.13 optical signal observation
Alarm warning light signals observed visibility in the dark.
6.14 stability test
Alarm stability test, according to the following methods.
a) Calibration Alarm, recording zero calibration point and alarm indication alarm device. Calibrated alarm, is not allowed during the trial
Xu recalibrated;
b) Alarm at 0.5% CH4 ± 0.20% CH4 gas samples successive test 15 days. After the test every day, according to the provisions of the Alarm
Charging;
c) Alarm test 10h a day, in the final test and record 10min alarm and display the value of index points. Measured four times, after taking
The arithmetic mean of 3 times. Error calculation according to equation (1).
6.15 Effect of wind speed
The alarm device into the ventilation test apparatus, adjust the alarm when Merry zero reference point, records show value, start the fan and adjust
Winds of 8 0.5 0 m/s, so that alarm about the man hanging pumping line direction, wind speed by looking for the location of its impact, and this fixed position. each
30s record 1 indication value, recording a total of 3 times the mean difference between the arithmetic mean and the reference point as the drift amount.
6.16 Working temperature test
6.16.1 low temperature test according to GB/T 2423.1-2008 Test Ad methods. Severities. Temperature 0 ± 3 ℃, duration
2h.
6.16.2 high temperature test according to GB/T 2423.2-2008 Test methods Bd. Severities. temperature 40 ± 2 ℃, duration
Between 2h.
Before the test, should be calibrated at 20 ± 2 ℃ temperature alarm; test, the sample gas temperature must be consistent with the test temperature, alarm has been energized;
After the temperature stabilized 2h, the test according to 6.5.
6.17 Storage Temperature Test
6.17.1 Low temperature test according to GB/T 2423.1-2008 Test Ab methods. Severities. Temperature -40 ℃, duration
16h.
6.17.2 High temperature test according to GB/T 2423.2-2008 Test Bb methods. Severities. temperature 60 ℃, duration 16h.
6.17.3 high and low temperature test, recovered 2h under normal ambient conditions, then 6.5 for testing.
6.18 Damp heat test
According to GB/T 2423.4-2008 Test Db methods. Severities. temperature of 40 ℃ ± 2 ℃, period 6d. Test, like
Machine no electricity, no intermediate testing. After the test, under normal environmental conditions return 2h, then 6.5 for testing.
6.19 Vibration Test
According to GB/T 2423.10-2008 Test Fc method. Severities as follows.
a) Frequency range. 10Hz ~ 150Hz, acceleration amplitude 20m/s2 (2g);
b) sweep cycles per axis 20 times;
c) When the alarm do the vibration test, non-working, non-packaged state;
d) three axial tests were done after the test according to 6.5 for testing.
6.20 Impact test
According to GB/T 2423.5 Test Ea method. Severity.
a) peak acceleration. 500m/s2 (5g);
b) pulse duration. 11ms;
c) Pulse wave. half sine wave;
d) continuous impact times. three times in three axes on each axis, a total of 18 times;
e) After the test according to 6.5 for testing.
6.21 Drop Test
According to GB/T 2423.8 Test Ed methods. Test table for the smooth concrete countertops, dropped four times, drop height
1m, with a coat of Alarm, Alarm should be loaded into the test jacket. After the test according to 6.5 for testing. Drop-proof performance test
Test according to the method specified in GB 3836.1-2010 performed.
6.22 Explosion Test
According to GB 3836.1-2010, GB 3836.2-2010 prescribed method of explosion-proof performance test 6.22.1 alarm device, GB 3836.4-2010 of
Conducted by the State inspection agency authorized by the explosion.
6.22.2 and intrinsic safety-related component inspection method according to the provisions in Chapter 7 GB 3836.4-2010 performed.
6.22.3 shell protection performance test method according to GB 4208-2008 in protection class IP54 requirements were.
6.22.4 Non-metallic shell surface insulation resistance test method according to GB 3836.1-2010 be specified in 26.13.
6.22.5 Alarm spark ignition test method according to GB 3836.4-2010 be specified in 10.1.
6.22.6 The maximum surface temperature test method according to GB 3836.4-2010 be specified in 10.2.
6.22.7 dielectric strength test according to the method specified in GB 3836.4-2010 10.3 carried.
6.22.8 creepage distances, clearances and spacing is measured by the method of the relevant provisions of the measure.
6.22.9 cell or battery explosion-proof performance test method according to GB 3836.4-2010 be specified in 10.5.
6.22.10 casting compound mechanical tests according to the method specified in GB 3836.4-2010 10.6 carried.
7 Inspection rules
7.1 Inspection classification
Inspection is divided into the factory inspection and type testing. Before mass production after the type inspection and obtain inspection certificate.
7.2 factory inspection
7.2.1 factory inspection by the factory quality inspection departments, inspection and issued before the factory after certification.
7.2.2 Test items specified in Table 3.
Table 3 Test items
No. Test Item Technical requirements, test methods factory inspection type test
1 appearance and structure 5.4 6.3 √ √
2 charging function check 5.5 6.4 √ √
3 The basic error 5.6 6.5 √ √
Table 3 (Continued)
No. Test Item Technical requirements, test methods factory inspection type test
4 hours Test 5.7 6.8 √ √
5 5.8 6.14 √ √ job stability
6 Response Time 5.9 6.7 √ √
7 Alarm 5.10 6.6 √ √
Change 5.11 6.11 √ √ 8 working position
9 insulation resistance test 5.12 6.9 √ √
10 dielectric strength test 5.13 6.10,6.22.7 √ √
Winds affect 11 5.14 6.15 - √
Working temperature test 12 5.15 6.16 - √
13 Storage temperature test 5.16 6.17 - √
14 Damp heat test 5.17 6.18 - √
15 vibration test 5.18 6.19 - √
16 impact test 5.19 6.20 - √
17 drop test 5.20 6.21 - √
18 elements intrinsic safety checks 5.21.2 6.22.2 - √
19 shell protection performance test 5.21.3 6.22.3 - √
20 non-metallic housing member surface insulation resistance test 5.21.4 6.22.4 - √
21 spark ignition test 5.21.5 6.22.5 - √
22 maximum surface temperature test 5.21.6 6.22.6 - √
23 clearances and creepage distances 5.21.7 6.22.8 * √
24 cell or battery explosion-proof performance test 5.21.8 6.22.9 - √
25 casting compound mechanical tests 5.21.8 6.22.10 - √
Note. "√" indicates should be examined; "-" indicates no test; "*" for the sampling project.
7.3 Type inspection
7.3.1 The instrument has one of the following circumstances, the type of inspection should be carried out.
a) new products or old products to the plant production trial to identify stereotypes;
B) after the official production, such as structure, materials, processes are greater when changes may affect product performance;
c) Normal production, regular or accumulated a certain number, it should be tested periodically, at least once a year, each less than three;
d) discontinued after one year to resume production when the product;
e) factory inspection results are quite different when the last type inspection;
f) the relevant national agencies when requested.
7.3.2 Type test items shown in Table 3.
7.3.3 type test according to the provisions sampling method GB/T 2829 will be (at least 3 samples). Using a sampling program, in which.
DL = Ⅰ, RQL = 30.
7.3.4 decision rule. when the subject sample test items 5.6 ~ 5.21.8 ~ 5.13,5.21.2 there is a failure, or there are two other projects
Item unqualified, it is determined that the product failed; does not include other items such as the above terms, there is a failure, then the whole project doubles draw
Kind of re-examination, re-examination is still unsatisfactory, it is determined that the product failed.
8 signs, packaging, transportation and storage
8.1 mark
8.1.1 Alarm should have "MA" symbol, "MA" symbol shall comply with the provisions of AQ1043-2007.
8.1.2 shell obvious place to set the rating plate should be clear, there should be the following.
a) Model, name;
b) proof mark;
c) Explosion-proof certificate number;
d) No safety signs;
e) battery parameters;
f) battery specifications, the number of the section;
g) inspection units flag;
h) the date of manufacture or product number.
8.2 Packaging
8.2.1 Alarm factory packaging, should ensure alarm during long-distance transport to prevent moisture, rain and sand intrusion.
Shall bear the following logos on the box 8.2.2 Alarm, and shall comply with the provisions of GB/T 191 is.
a) trademark...
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