MT 443-1995 General technical requirements for sensors used for underground coal mine environmental monitoring
Some standard content:
Coal Industry Standard of the People's Republic of China
General Technical Conditions for Sensors for Underground Environmental Monitoring in Coal Mines Subject Content and Scope of Application
MT443-1995
This standard specifies the general technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of sensors for underground environmental monitoring in coal mines (hereinafter referred to as sensors). This standard applies to various sensors for underground environmental monitoring in coal mines. 2 Referenced Standards
GB191 Graphical marking for packaging, storage and transportation
Basic environmental test procedures for electrical and electronic products Test A: Low temperature test method GB2423.1
GB2423.2 Basic environmental test procedures for electrical and electronic products Test B: High temperature test method GB/T 2423. 4
GB 2423. 5
Basic environmental test regulations for electric and electronic products Test Db: Alternating damp heat test method Basic environmental test regulations for electric and electronic products Test Ea: Impact test method GB2423.8 Basic environmental test regulations for electric and electronic products Test Ed: Free fall test method GB2423.10 Basic environmental test regulations for electric and electronic products Test Fc: Vibration (sinusoidal) test method GB3836.1 General requirements for explosion-proof electrical equipment for explosive atmospheres GB3836.2 Explosion-proof electrical equipment for explosive atmospheres GB3 836.3 Explosion-proof electrical equipment for explosive atmospheres GB3836.4 Explosion-proof electrical equipment for explosive atmospheres GB/T4942.2 Protection level of low-voltage electrical enclosures Flameproof electrical equipment ""
Increased safety electrical equipment\e"
Intrinsically safe circuits and electrical equipment "i" GB10111 Random sampling method using random numbers MT/T408 DC regulated power supply for coal mines
3 Terms
3.1 Environmental monitoring
envirornent monitor
Monitor, measure and process data of toxic and harmful gases, dust, temperature, humidity, air pressure, wind speed, air volume and other parameters in the atmospheric environment of coal mines.
3.2 Clean airfresh air
Air that does not contain the measured gas and other pollutants. 4. Technical requirements
4.1 The product shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 4.2 General requirements.
4.2.1 Working conditions
Temperature: 0~40℃;
Relative humidity: ≤98% (25℃);
Approved by the Ministry of Coal Industry of the People's Republic of China on March 8, 1996 and implemented on August 1, 1996
Atmospheric pressure: 80~110kPa;
Speed.0~8m/s.
4.2.2 Storage temperature is - 40～60℃.
MT443--1995
4.2.3 The sensor shall adopt intrinsically safe or intrinsically safe and flameproof explosion-proof structure and meet the relevant provisions of GB3836.1, GB3836.2, GB3836.3 and GB3836.4. 4.2.4 The power supply
shall meet the requirements of MT/T408.
4.2.5 Output signal format:
4.2.5.1 If the switch quantity sensor is mechanical contact type, its resistance when disconnected shall be greater than 100kQ2; if it is electronic type, its high level shall not be less than 3V and its low level shall not be higher than 0.5V. 4.2.5.2 The analog quantity sensor shall use the following signal format current: DC1～5mA (preferred), 4～20mA (load resistance 0～500Q). Frequency: 5~15Hz, 200~1000Hz (pulse width greater than 0.3ms). Digital coding: transmission rate is 300, 600, 1200, 2400, 4800, 9600b/s, and the level is less than 3V. 4.2.6 Analog sensors should give priority to using digital indicators to display measurement values, and their resolution should meet the accuracy requirements of the parameters measured by the sensor.
4.2.7 The sensor should have a suspension or support structure suitable for underground installation. 4.2.8 The protection performance of the sensor housing should comply with the IP54 protection level specified in GB4942.2. 4.2.9 The cross-sectional area of the sensor external cable should not be greater than 1.5mm; the transmission distance of the sensor should not be less than 1km. 4.2.10 Anti-corrosion measures should be taken for the sensor housing, connectors and parts, and the coating and plating should be uniform, firm and consistent in color. The printed circuit board should be coated with three-proof (anti-corrosion, anti-mildew, and moisture-proof) insulating paint at least twice. 4.2.11 Necessary accessories should be provided.
4.3 The basic error of the sensor should meet the technical requirements of the corresponding product. 4.4 When the load resistance of the sensor changes within the range of 0 to 5000, the change of its output signal value should not exceed the provisions of the basic error. 4.5 The stability of the sensor should meet the technical requirements of the corresponding product. 4.6 The response time of the sensor should meet the technical requirements of the corresponding product. 4.7 Alarm function:
4.7.1 Sensors with alarm function should be able to set alarm points arbitrarily within the measurement range, and the difference between the alarm value and the set value should meet the technical requirements of the corresponding product.
4.7.2 For sensors with sound and light alarm function, the sound pressure level of the sound signal at a distance of 1m should not be less than 80dB(A), and the light signal should be clearly visible at 20m in a dark environment. 4.8 The drift of the indicated value of the sensor under the wind speed of 8m/s should meet the technical requirements of the corresponding product. 4.9 During the working temperature test, the performance of the sensor should meet the technical requirements of the corresponding product. 4.10 After the storage temperature test, the performance of the sensor shall meet the technical conditions of the corresponding product. 4.11 After the humidity and heat test, the performance of the sensor shall meet the technical conditions of the corresponding product. 4.12 After the vibration test, the connectors and parts of the sensor shall not be loose or fall off; its performance shall meet the technical conditions of the corresponding product. 4.13 After the impact test, the sensor shall have no signs of damage, and the connectors and parts shall not be loose or fall off; its performance shall meet the technical conditions of the corresponding product.
4.14 After the drop test, the connectors and parts of the sensor shall not be loose or fall off; its performance shall meet the technical conditions of the corresponding product. 5 Test method
5.1 Environmental conditions:
Unless otherwise specified in the environmental test or relevant standards, the test shall be carried out under the following environmental conditions: 276
Degrees: 15~～35℃;
Relative humidity: 45%～75%;
Atmospheric pressure: 86～106kPa.
5.2 Load characteristic test:
MT 443-1995
Make the sensor stably display the measured value, record the difference between the output signal value when the external load resistance is 500Ω and 0Ω, and convert it into the measured value. 5.3 The determination method of basic error shall be carried out in accordance with the method specified in the corresponding product standards. 5.4 The determination method of stability shall be carried out in accordance with the method specified in the corresponding product standards. 5.5 The determination method of response time shall be carried out in accordance with the method specified in the corresponding product standards. 5.6 Alarm function test:
5.6.1 Determination of the difference between the alarm value and the set value. Set the alarm point of the sensor to the value specified at the factory. After the zero point of the sensor is stable, slowly pass the test medium slightly larger than the alarm point, record the sensor indication value at the moment when the sound and light signals appear, and calculate the difference between the alarm point and the indication value. 5.6.2 Measurement of alarm sound level intensity.
The alarm sound performance is measured with a sound level meter, and the environmental noise should be less than 50dB (A). Place the sound level meter 1m in front of the axis of the alarm sounder of the sensor, measure 3 times, and take the arithmetic mean. 5.6.3 Alarm light signal.
The test is observed in a dark environment at a distance of 20m from the sensor. 5.7 Wind speed influence test:
Hang the sensor in the test wind tunnel, and adjust the reference point of the sensor when the wind speed is zero. Then adjust the wind speed to 8+°5m/s, and artificially rotate the sensor around the hanging axis to find the position affected by the wind speed. Fix it in this position, record the display value once every 30s, and record it 3 times in total. Take the difference between the arithmetic mean and the reference point as the drift. 5.8 Working temperature test: bZxz.net
When the medium needs to be passed into the sensor during the test, its temperature should be consistent with the test requirement temperature. 5.8.1 Low temperature working test.
Perform according to the test Ab method in GB2423.1. At a temperature of 0±3℃, the sensor is powered on and stabilized for 2h, then the basic error is measured. Then the basic error is measured once every 1h, for a total of 3 times. The arithmetic mean is taken as the measured value. 5.8.2 High temperature working test.
Perform according to the test Bb method in GB2423.2. At a temperature of 40±2℃, the sensor is powered on and stabilized for 2h, then the basic error is measured. Then the basic error is measured once every 1h, for a total of 3 times. The arithmetic mean is taken as the measured value. 5.9 Storage temperature test.
5.9.1 Low temperature storage test:
Perform according to the test method Ab in GB2423.1. The duration is 16 hours at a temperature of -40±3°C (for sensors with liquid electrolyte electrochemical components, it is determined separately). The sensor is not packaged, not powered, and no intermediate detection is performed. After the test, it is restored to the conditions specified in 5.1 in the test box for 2 hours, and then the basic error is measured. 5.9.2 High temperature storage test.
Perform according to the test method Bb in GB2423.2. The duration is 16 hours at a temperature of +60±2°C (for sensors with liquid electrolyte electrochemical components, it is determined separately). The sensor is not packaged, not powered, and no intermediate detection is performed. After the test, it is restored to the conditions specified in 5.1 in the test box for 2 hours, and then the basic error is measured. 5.10 Humidity test:
Perform according to the test method Db in GB2423.4. The temperature is 40±2℃, the relative humidity is 93%±3%, and the duration is 12d. The sensor is not packaged, not powered, and no intermediate detection is performed. After the test, it is restored for 2h under the conditions specified in Article 5.1, and then the basic error is measured. 5.11 Vibration test:
Performed according to the test Fc method in GB2423.10. Severity level: sweep frequency range 10~150Hz, acceleration amplitude 50m/s2, 277
MT443—1995
Vibration times 5 times. The sensor is not packaged. The fixed sensor is not powered, and no intermediate detection is performed; the airborne mobile sensor is powered and intermediate detection is performed. After the test, the appearance inspection and basic error are measured. 5.12 Impact test:
Performed according to the test Ea method in GB2423.5. Severity level: peak acceleration is 500m/s2, pulse duration is 11±1ms, 3 axes are impacted continuously in each direction for 3 times (18 times in total), and the sensor is not packaged. The fixed sensor is not powered on, and no intermediate detection is performed; the airborne mobile sensor is powered on and intermediate detection is performed. After the test, the appearance inspection and basic error determination are performed again. 5.13 Drop test:
Performed according to the test Ed method in GB2423.8. Severity level: Drop height is 0.5m, free fall in the normal use direction onto a smooth, hard concrete surface for a total of 2 times. The sensor is not packaged, powered on, and no intermediate detection is performed. After the test, the appearance inspection is performed, and the basic error is determined again.
5.145.9~5.13 After each test, before checking the function, it is allowed to recalibrate the sensor. 5.15 The explosion-proof performance test method of the sensor shall be carried out by the authorized explosion-proof inspection agency in accordance with the provisions of GB3836.1, GB3836.2, GB3836.3 and GB3836.4.
6 Inspection rules
6.1 Factory inspection
6.1.1 The quality inspection department of the manufacturer shall conduct the inspection on each unit. The product may leave the factory only after passing the inspection and issuing the certificate of conformity. 6.1.2 The factory inspection items are shown in Table 1 and the provisions of the corresponding product technical conditions. 6.2 Type inspection
Type inspection shall be carried out in any of the following situations: when a new product or old product is transferred to the factory for trial production and type identification; after formal production, if there are major changes in structure, materials, and processes that may affect product performance, the normal production of sensors shall be conducted once every two years;
When production is resumed after being suspended for more than two years;
When the results of the factory inspection are significantly different from the last type inspection; when the national quality supervision and inspection agency makes a request. The type inspection items are shown in Table 1 and the provisions of the corresponding product technical conditions. Type inspection shall be conducted by the quality supervision and inspection agency authorized by the Ministry of Coal Industry. 6.3 Sampling
Technical requirements clause
Factory inspection
Type inspection
MT 443—1995
Continued Table 1
Technical requirements clause
Type inspection
Note: ○ indicates items that must be conducted.
From the sensors that have passed the factory inspection, the method specified in GB10111 shall be used. The sampling base shall not be less than 10 units, and the sampling quantity shall not be less than 3 units.
6.4 Judgment rules
The number of sensors to be inspected is 3. Execute in accordance with the provisions of the corresponding sensor technical conditions. >
Marking, packaging, transportation, storage
7.1 Marking
The housing of the sensor should be marked with "Ex", "MA" and measuring instrument markings. 7. 1. 1
The nameplate of the sensor should have the following contents: product model and name;
"Ex" mark in the upper right corner,
explosion-proof mark;
explosion-proof inspection certificate number;
coal mine safety mark number;
manufacturing measuring instrument license number;
related equipment model;
main technical parameters;
protection level;
manufacturer name;
factory number or date.
Packing marking:
Shipping markings should comply with relevant transportation regulations; operation markings should comply with the provisions of GB191.
7.2 Packaging
The packaging should be a composite protective packaging type, with rainproof, moisture-proof, dustproof and vibration-proof capabilities. The following documents should be included in the packaging box:
Product certificate;
Product instruction manual;
Packing list.
7.3 Transportation
The packaged sensor should be suitable for road, rail, water and air transportation279
7.4 Storage
MT4431995
It should be stored in a well-ventilated warehouse without corrosive gas. Additional notes:
This standard was proposed by the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry, and this standard is under the jurisdiction of the Gas Detection and Rescue Equipment Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard was drafted by the Fushun Branch of the China Coal Research Institute. The main drafter of this standard is Miao Yaxin.
This standard is entrusted to the Fushun Branch of the China Coal Research Institute for interpretation. 2801 Factory inspection
6.1.1 The quality inspection department of the manufacturer shall conduct factory inspection on each unit. The product may leave the factory only after passing the inspection and issuing the certificate of conformity. 6.1.2 The factory inspection items are shown in Table 1 and the provisions of the corresponding product technical conditions. 6.2 Type inspection
Type inspection shall be conducted in any of the following situations: when a new product or old product is transferred to the factory for trial production and type identification; after formal production, if there are major changes in structure, materials, and processes that may affect product performance, the normal production of sensors shall be conducted once every two years;
When production is resumed after being suspended for more than two years;
When the factory inspection results are significantly different from the last type inspection; when the national quality supervision and inspection agency makes a request. The type inspection items are shown in Table 1 and the provisions of the corresponding product technical conditions. Type inspection shall be conducted by the quality supervision and inspection agency authorized by the Ministry of Coal Industry. 6.3 Sampling
Technical requirements clause
Factory inspection
Type inspection
MT 443—1995
Continued Table 1
Technical requirements clause
Type inspection
Note: ○ indicates items that must be carried out.
Carry out the sampling according to the method specified in GB10111 from the sensors that have passed the factory inspection. The sampling base shall not be less than 10 units, and the sampling quantity shall not be less than 3 units.
6.4 Judgment rules
The number of sensors to be inspected shall be 3 units. Carry out in accordance with the provisions of the corresponding sensor technical conditions. >
Marking, packaging, transportation, storage
7.1 Marking
The housing of the sensor shall be marked with "Ex", "MA" and the measuring instrument mark in an obvious place. 7. 1. 1
The nameplate of the sensor should have the following information: product model and name;
There is an "Ex" mark in the upper right corner,
explosion-proof mark;
explosion-proof inspection certificate number;
coal mine safety mark number;
manufacturing measuring instrument license number;
related equipment model;
main technical parameters;
protection level;
manufacturer name;
factory number or date.
Packing mark:
The shipping mark should comply with the relevant transportation regulations; the operation mark should comply with the provisions of GB191.
7.2 Packaging
The packaging should adopt a composite protective packaging type with rainproof, moisture-proof, dustproof and vibration-proof capabilities. The following documents should be included in the packaging box:
Product certificate;
Product instruction manual;
Packing list.
7.3 Transportation
The packaged sensor should be suitable for road, rail, water and air transportation279
7.4 Storage
MT4431995
Should be stored in a well-ventilated warehouse without corrosive gas. Additional notes:
This standard was proposed by the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry, and this standard is under the jurisdiction of the Gas Detection and Rescue Equipment Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard was drafted by the Fushun Branch of the China Coal Research Institute. The main drafter of this standard is Miao Yaxin.
This standard is entrusted to the Fushun Branch of the China Coal Research Institute for interpretation. 2801 Factory inspection
6.1.1 The quality inspection department of the manufacturer shall conduct factory inspection on each unit. The product may leave the factory only after passing the inspection and issuing the certificate of conformity. 6.1.2 The factory inspection items are shown in Table 1 and the provisions of the corresponding product technical conditions. 6.2 Type inspection
Type inspection shall be conducted in any of the following situations: when a new product or old product is transferred to the factory for trial production and type identification; after formal production, if there are major changes in structure, materials, and processes that may affect product performance, the normal production of sensors shall be conducted once every two years;
When production is resumed after being suspended for more than two years;
When the factory inspection results are significantly different from the last type inspection; when the national quality supervision and inspection agency makes a request. The type inspection items are shown in Table 1 and the provisions of the corresponding product technical conditions. Type inspection shall be conducted by the quality supervision and inspection agency authorized by the Ministry of Coal Industry. 6.3 Sampling
Technical requirements clause
Factory inspection
Type inspection
MT 443—1995
Continued Table 1
Technical requirements clause
Type inspection
Note: ○ indicates items that must be carried out.
Carry out the sampling according to the method specified in GB10111 from the sensors that have passed the factory inspection. The sampling base shall not be less than 10 units, and the sampling quantity shall not be less than 3 units.
6.4 Judgment rules
The number of sensors to be inspected shall be 3 units. Carry out in accordance with the provisions of the corresponding sensor technical conditions. >
Marking, packaging, transportation, storage
7.1 Marking
The housing of the sensor shall be marked with "Ex", "MA" and the measuring instrument mark in an obvious place. 7. 1. 1
The nameplate of the sensor should have the following information: product model and name;
There is an "Ex" mark in the upper right corner,
explosion-proof mark;
explosion-proof inspection certificate number;
coal mine safety mark number;
manufacturing measuring instrument license number;
related equipment model;
main technical parameters;
protection level;
manufacturer name;
factory number or date.
Packing mark:
The shipping mark should comply with the relevant transportation regulations; the operation mark should comply with the provisions of GB191.
7.2 Packaging
The packaging should adopt a composite protective packaging type with rainproof, moisture-proof, dustproof and vibration-proof capabilities. The following documents should be included in the packaging box:
Product certificate;
Product instruction manual;
Packing list.
7.3 Transportation
The packaged sensor should be suitable for road, rail, water and air transportation279
7.4 Storage
MT4431995
Should be stored in a well-ventilated warehouse without corrosive gas. Additional notes:
This standard was proposed by the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry, and this standard is under the jurisdiction of the Gas Detection and Rescue Equipment Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard was drafted by the Fushun Branch of the China Coal Research Institute. The main drafter of this standard is Miao Yaxin.
This standard is entrusted to the Fushun Branch of the China Coal Research Institute for interpretation. 280
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