MT/T 782.2-1998Mechanical and electrical equipment temperature transducer for coal mine specification for ON/OFF output (English PDF)

3.1 Model

Should conform to MT Relevant provisions of 286.

3.2 Type

3.2.1 According to explosion-proof type. mine intrinsically safe type; general mine type.

3.2.2 According to measurement methods. contact type; non-contact type.

3.2.3 By action value. fixed value type; adjustable type

3.3 Specifications

3.3.1 According to operating temperature. from 0

Starting at °C every 5 °C a grade.

3.3.2 According to temperature adjustment range. The temperature adjustment range of the adjustable temperature sensor is regulated by the product standard.

4.2 Environmental conditions

4.2.1 The temperature sensor should work normally under the following conditions.

a) Ambient temperature. -5 ~ 40 °C, other temperature grades should meet MT Provision of 4.2 of 209-1990;

b) Average relative humidity. not more than 95% (25 °C);

c) Atmospheric pressure. 80 ~ 106 kPa;

d) Where there is no corrosive gas that destroys insulation in coal mines.

4.2.2 The worst storage and transportation conditions that the temperature sensor can withstand are.

a) High temperature. 60 °C;

b) Low temperature. -40 °C;

c) Average relative humidity. 95% (25 °C);

d) Vibration. acceleration 50 m/s2;

e) Shock. Peak acceleration 500 m/s2.

4.3 Basic performance

4.3.1 Operating temperature

The operating temperature of the fixed temperature sensor shall comply with the provisions of 3.3.1.

4.3.2 Recovery temperature

Specific by the product standard.

4.3.3 Temperature deviation

The temperature limit deviation of the operating temperature and the recovery temperature is generally selected from the following values. ± 0.5, ± 1.0, ± 1.5, ± 2.0, ± 2.5, ± 3.0 °C.

4.3.4 Operating temperature adjustment range

For the action value adjustable temperature sensor, the product standard should specify.

4.3.5 Response time

Generally not greater than 5 s, specified by the product standard.

4.3.6 Detection angle and detection distance

Non-contact temperature sensors are specified by product standards.

4.3.7 Output signal

Should conform to MT Provisions of 5.3.2 of 209-1990.

4.3.8 Supply voltage

AC power supply voltage level should conform to GB According to 156, the DC power supply voltage level should conform to MT/T Regulation 408, specifically Product standards.

4.4 Select performance

The temperature sensor can choose the following performance, but it should meet the requirements for use.

a) Multi-point measurement output function;

b) alarm function;

c) display function;

d) other properties.

4.5 Power fluctuation adaptability

When the supply voltage changes within the working voltage range specified in the product standard, the temperature sensor should be able to work normally and the technical performance conforms to the Provision of product standards.

4.6 Structure

4.6.1 Metal parts shall be treated with anti-rust and anti-corrosion.

4.6.2 Fasteners must have measures to prevent automatic release.

4.6.3 General requirements for electrical clearances and creepage distances, main parts and components, grounding and structures shall meet MT 209-1990 number 7 Chapter, Chapter 8, Chapter 9, 11.3 and GB/T 12173 relevant provisions.

4.6.4 Plastic components shall be made of non-combustible or non-combustible materials.

4.7 Appearance quality

4.7.1 The surface is flat, without damage and scars, and the metal parts have no rust.

4.7.2 Signs and nameplates shall be complete, clear and firm.

4.7.3 Moving parts shall be flexible and reliable.

4.7.4 There shall be no loosening of fasteners.

4.8 Shell protection

The protection capability of the enclosure should not be lower than IP54. For general temperature sensors used in mines without dripping water and dust intrusion, allow may reduce requirements, but must not be lower than IP21.

4.9 Electrical safety

4.9.1 Insulation resistance

Insulation resistance between live circuit and ground (or enclosure) should meet MT the provisions of 11.1 in 209-1990, the specific measurement location is Respective product standards.

4.9.2 Power frequency withstand voltage

1 between live circuit and ground (or enclosure) Min power frequency withstand voltage should meet MT 11.2 of 209-1990 and no fire Flowers, flashovers and breakdown phenomena, the specific test parts are specified by the respective product standards.

4.10 Surface temperature

Temperature sensor in normal working and fault state, the maximum surface temperature of its components, wires and casing must not exceed 150 °C.

4.11 Work stability

The temperature sensor should be tested for working stability.

d. Its technical performance shall meet the requirements of the respective product standards.

4.12 Reliability

The MT BF of the temperature sensor should not be less than 4000 h.

4.13 Environmental adaptability

4.13.1 The temperature sensor should be able to pass the high-temperature working test when it is powered on, and its technical performance and appearance quality should meet the respective product standards.

Provisions.

4.13.2 The temperature sensor should be able to pass the low temperature working test when it is powered on, and its technical performance and appearance quality should meet the respective product standards.

Provisions.

4.13.3 The temperature sensor should be able to pass the high-temperature storage test in the non-working state, and the technical performance and appearance quality of the temperature sensor after recovery should conform to the respective Provision of product standards.

4.13.4 The temperature sensor should be able to pass the low-temperature storage test in the non-working state, and the technical performance and appearance quality of the temperature sensor should be consistent with the respective Provision of product standards.

4.13.5 The temperature sensor shall be able to pass the alternating humidity and heat test, and its technical performance, electrical safety performance and appearance quality shall comply with the respective product standards.

Regulations.

4.13.6 The temperature sensor shall be able to pass the vibration test, and its technical performance and appearance quality shall meet the requirements of the respective product standards.

4.13.7 The temperature sensor shall be able to pass the impact test, and its technical performance and appearance quality shall meet the requirements of the respective product standards.

4.13.8 The temperature sensor shall be able to pass the drop test in a non-working state, and its technical performance and appearance quality shall meet the requirements of the respective product standards.

Regulations.

4.13.9 The packaged temperature sensor shall be able to withstand simulated automobile transportation tests. After the test, the packaging box should be free of damage and obvious deformation.

The technical performance and appearance quality of the temperature sensor shall meet the requirements of the respective product standards.

4.14 Mine and explosion-proof performance

4.14.1 Mine-used intrinsically safe temperature sensors must comply with GB

3836.1 and GB

3836.4 required to pass the required tests the designated explosion-proof inspection unit passed the inspection and passed the inspection and obtained the "Explosion-proof Inspection Certificate".

4.14.2 General temperature sensors for mining shall comply with GB/T

According to the requirements of 12173, it has passed the prescribed tests and passed the national explosion-proof inspection.

The inspection unit passed the inspection and obtained the "Mining Qualification Certificate."

5.1 Test conditions

5.1.1 Environmental conditions

5.1.1.1 Reference atmospheric conditions.

a) Temperature. (20 ± 2) °C;

b) Relative humidity. 60% ~ 70%;

c) Atmospheric pressure. 86 ~ 106 kPa.

5.1.1.2 Tests under reference atmospheric conditions are not required.The following general test atmospheric conditions are recommended.

a) Temperature. 15 ~ 35 °C;

b) Relative humidity. 45% ~ 75%;

c) Atmospheric pressure. 86 ~ 106 kPa.

5.1.2 Power conditions

Unless otherwise specified in the relevant standards, the power supply must meet the following requirements.

a) The tolerance of the supply voltage must not exceed ± 1% of its nominal value;

b) The period and random deviation of the supply voltage must not exceed 0.2% of its nominal value.

5.2 Measuring instruments and equipment

5.2.1 General requirements for measuring instruments and equipment

a) The accuracy and measurement range of measuring instruments and equipment should ensure the requirements of the measured indicators;

b) The selection of measuring instruments and equipment should meet the characteristics of the measured performance.

5.2.2 Standard temperature generating device

a) It can generate equipment temperature that meets the requirements of product standards, the temperature field is stable, and the uniform temperature area should meet the test requirements;

b) Equipped with a standard thermometer, the basic error should not be greater than 1/3 of the basic error of the measured temperature sensor.

5.2.3 Electronic stopwatch.

a) Average error. not more than 0.5 s/d;

b) Resolution. 0.01

5.2.4 DC Voltmeter and DC Ammeter.

a) Accuracy. no less than 2.5;

b) range. should meet the measurement requirements;

c) Internal resistance. The internal resistance of the voltmeter is not less than 30 times the measured resistance, and the internal resistance of the ammeter is not more than 1/30 times the measured resistance.

5.2.5 Regulated Power Supply

a) Output voltage. The adjustable range should be greater than the supply voltage range of the temperature sensor;

b) Output power. should meet the measurement requirements;

c) Accuracy. no less than 2.5.

5.2.6 Adjustable resistor

a) The range of resistance change should meet the measurement requirements;

b) The power shall meet the measurement requirements.

5.2.7 Multimeter

a) Accuracy. no less than 2.5;

b) The measuring range should meet the measurement requirements.

5.3 Basic performance test method

5.3.1 General test requirements

5.3.1.1 The test shall be carried out under reference working conditions. In addition to arbitration, it is necessary to correctly determine whether the operating temperature of the temperature sensor is qualified.

Under the premise, the test is allowed to be carried out under normal test atmospheric conditions.

5.3.1.2 The measured temperature sensor shall be installed in accordance with the specified working conditions. The non-contact temperature sensor test should be at the maximum detection distance get on.

5.3.2 Operating temperature, recovery temperature and temperature deviation test

5.3.2.1 The temperature change rate should not be greater than 1 °C/min.

5.3.2.2 Adjust the standard temperature generating device to make the temperature increase steadily until the output signal of the temperature sensor changes, and then decrease smoothly.

As low as the temperature sensor output signal is restored, the corresponding operating temperature and restoration temperature are measured respectively.

5.3.2.3 The test shall be performed 3 times.

5.3.2.4 The maximum deviation between the measured operating temperature and the recovery temperature minus the standard value is the temperature deviation.

5.3.3 Test of operating temperature adjustment range

5.3.3.1 The test shall not be less than 5 test points.The test points shall include the upper and lower limits of the adjustment range and be evenly distributed throughout the adjustment range.

Within.

5.3.3.2 At each test point, test according to 5.3.2.

5.3.4 Response time test

Place the temperature sensor under test on a standard temperature generator that has been adjusted to the operating temperature from room temperature, and test the temperature sensor output signal.

The time required for the number to change is the response time.

5.3.5 Detection angle and detection distance test

Place the measured temperature sensor in front of the standard temperature generating device with a distance equal to the specified detection distance and an angle of the specified detection temperature.

Angle measurement. The temperature sensor should have a signal output corresponding to the temperature, and its deviation should be within the specified range.

The test was repeated at least 4 times. During the test, the detection angles should be in different directions evenly distributed.

5.3.6 Output signal test

5.3.6.1 Passive switch output signal test

5.3.6.1.1 Test of output disconnection state. Use a multimeter to measure the resistance between the two output terminals.

Leakage resistance in the state.

5.3.6.1.2 Test of output closed state

a) The temperature sensor input and output terminals are connected according to Figure 1;

figure 1

b) Make the temperature sensor output closed, adjust resistor R to make ammeter A display as 2 mA, the indication of voltmeter V2 Value should be no greater than 0.5 V.

5.3.6.2 Active switch output signal test

5.3.6.2.1 Output high level test.

a) The temperature sensor input and output terminals are connected according to Figure 2;

b) Make the temperature sensor output high level, adjust resistor R to make ammeter A display as 2 mA, the voltmeter V2 figure 2 the displayed value is the measured value of the output high state.

5.3.6.2.2 Output low level test.

a) The temperature sensor input and output terminals are connected according to Figure 1;

b) Make the temperature sensor output low level, adjust resistor R to make ammeter A display as 2 mA, the voltmeter V2 the displayed value is the actual measured value of the output low state.

5.4 Select performance test

Defined by respective product standards.

5.5 Power fluctuation adaptability test

Press MT

210-1990 Chapter 10.

5.6 Structural inspection

Press MT

210-1990 Chapter 5 relevant provisions.

5.7 Visual inspection

Press MT

210-1990 Chapter 5 relevant provisions.

5.8 Shell protection performance test

Press MT

210-1990 Chapter 16.

5.9 Insulation resistance measurement

Press MT

210-1990 Chapter 7.

5.10 Power frequency withstand voltage test

Press MT

210-1990 Chapter 8

5.11 Surface temperature measurement

Press MT

210-1990 Chapter 11.

5.12 Work stability test

The temperature sensor is in the power-on state, and the power-on time should meet the requirements of the respective product standards.

h test once the operating temperature, recovery Temperature and temperature deviation. At the end of the test, check the technical performance according to the specifications of the respective product.

5.13 High temperature work test

Press MT

The relevant provisions of Chapter 23 of 210-1990 are carried out. The device under test is powered on, and the severity level is. the temperature is the highest environment Temperature, duration 2 h.

5.14 Low temperature working test

Press MT

The relevant provisions of Chapter 23 of 210-1990 are carried out. The equipment under test is powered on, and the severity level is. the temperature is the minimum environment Temperature, duration 2 h.

5.15 High temperature storage test

Press MT

210-1990 Chapter 24. The device under test is in a non-energized state, and the severity level is. temperature 60 °C, Duration 16 h, recovery time is not less than 1 h.

5.16 Low temperature storage test

Press MT

210-1990 Chapter 24. The device under test is in a non-powered state, and the severity level is. temperature -40 °C, Duration 16 h, recovery time is not less than 1 h.

5.17 Damp heat test

Press MT

210-1990 Chapter 28. Severity rating. Temperature 40 °C, period 12 d.

5.18 Vibration test

Press MT

210-1990 Chapter 25. The device under test is in a non-powered state, and the severity level is. frequency 10 ~ 150 Hz, Acceleration amplitude 50 m/s2, no less than 5 sweeps per axis.

5.19 Impact test

Press MT

210-1990 Chapter 26. The device under test is in a non-energized state, and the severity level is. peak acceleration m/s2, pulse duration 11 ms, 3 times in each direction perpendicular to the axis (total 18 times).

5.20 Drop test

Press MT

210-1990 in accordance with 5.2.1. The equipment under test is in a non-energized state, and the severity level should meet the requirements in Table 1.

Table 1

Temperature sensor weight W, kg drop height, mm drop times W<=2 1000

2 W<=5 500

5 W<=10.200

5.21 Transport test

Press MT

210-1990 Chapter 27. The equipment under test shall be packed in accordance with the provisions of the respective product standards, and the tests shall be rigorous.

Level is. frequency 4 Hz, acceleration 30 m/s2, test time 2 h.

5.22 Reliability test

Press GB/T

5080.7 relevant provisions. If no other standards provide otherwise, a timed censoring test scheme is used. Failure determination shall Meet GB/T 5080.1-1986 provisions of 9.2.

5.23 Mine and explosion-proof performance test

Press GB

3836.1, GB

3836.4 and GB/T

12173 relevant provisions.

6.1 Inspection classification

Inspection is generally divided into two types. factory inspection and type inspection.

6.2 Factory inspection

6.2.1 Each temperature sensor must be inspected at the factory. The factory inspection is carried out by the quality inspection department of the manufacturer.

Pass.

6.2.2 The test items shall meet the requirements in Table 2.

6.2.3 During the factory inspection, each index must meet the requirements of the respective product standards. If there is a failure, the product is unqualified. If Class C appears Unqualified, allowed to be repaired into qualified products. If Class A and B fail, they should be reworked and retested.

6.3 Type inspection

6.3.1 Type inspection shall be carried out in any of the following cases

a) When new or old products are transferred to the factory for finalization;

b) After formal production, when there are major changes in structure, materials and processes that may affect performance;

c) 2 years of normal production (except for mining and explosion-proof performance);

d) When production is suspended for 1 year and production resumes;

e) When the factory inspection results are significantly different from the last type inspection results;

f) When the national quality supervision agency proposes to carry out type inspection.

6.3.2 The test items shall meet the requirements in Table 2.

Table 2

Serial number of test items failed classification test items require factory inspection type inspection

1 Basic performance B 4.3 - -

2 Select Performance B 4.4

3 Power fluctuation adaptability B 4.5--

4 Structure C 4.6 - -

5 Appearance quality C 4.7 - -

6 Housing protection performance B 4.8 -