GB 13486-2014Portable heating catalytic methane alarm detector (English PDF)

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 °C ~ 40 °C;

b) Relative humidity. <=95% (at 25 °C);

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 °C ~ 60 °C.

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, 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 50Mohm; after alternating hot and humid test, not less than 1.5Mohm.

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 1Gohm 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 °C.

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.

6.1 Test environment condition

Test normal atmospheric conditions.

a) Temperature. 15 °C ~ 35 °C;

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).

delta =

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).

I × 10

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 °C, duration 2h.

6.16.2 high temperature test according to GB/T 2423.2-2008 Test methods Bd. Severities. temperature 40 ± 2 °C, duration Between 2h.

Before the test, should be calibrated at 20 ± 2 °C 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 °C, duration 16h.

6.17.2 High temperature test according to GB/T 2423.2-2008 Test Bb methods. Severities. temperature 60 °C, 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 °C ± 2 °C, 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.

7.1 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 sqrt sqrt 2 charging function check 5.5 6.4 sqrt sqrt

3 The basic error 5.6 6.5 sqrt sqrt

Table 3 (Continued)

No. Test Item Technical requirements, test methods factory inspection type test 4 hours Test 5.7 6.8 sqrt sqrt 5 5.8 6.14 sqrt sqrt job stability

6 Response Time 5.9 6.7 sqrt sqrt

7 Alarm 5.10 6.6 sqrt sqrt Change 5.11 6.11 sqrt sqrt 8 working position 9 insulation resistance test 5.12 6.9 sqrt sqrt 10 dielectric strength test 5.13 6.10,6.22.7 sqrt sqrt Winds affect 11 5.14 6.15 - sqrt Working temperature test 12 5.15 6.16 - sqrt