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1. Application
Usually used in conjunction with display instruments, recording instruments, electronic computing, etc. Directly measure the temperature of liquid, vapor, gas media, and solid surfaces within the range of 0 ° C to 1300 ° C in the presence of hydrocarbons and other explosives on the production site.
2. Characteristics
·Multiple explosion-proof forms with good explosion-proof performance;
·Pressure spring type temperature sensing element with good anti vibration performance;
·Large temperature measurement range;
·High mechanical strength and good pressure resistance;
3. Working principle
Explosion proof thermocouple utilizes the principle of gap explosion-proof to design junction boxes and other components with sufficient strength. All components that can generate sparks, arcs, and dangerous temperatures are sealed inside the junction box cavity. When an explosion occurs inside the cavity, it can be extinguished and cooled through the gap between the joint surfaces, preventing the flame and temperature after the explosion from being transmitted outside the cavity, thus achieving explosion-proof.
4. Main technical parameters
Product execution standards
IEC584
IEC1515
GB/T16839-1997
JB/T5518-91
GB3836
5. Room temperature insulation resistance
Thermocouples are tested at an ambient temperature of 20 ± 15 ° C, relative humidity not exceeding 80%, and a test voltage of 500 ± 50V (DC). The insulation resistance between the electrode and the outer sheath is greater than 1000 Ω. m
6. List of Evidence Collection
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Explosion proof level
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Explosion proof certificate number
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Certification body
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d‖BT4
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GYB96450
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NEPSI
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d‖BT4
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GYB96453
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NEPSI
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d‖CT5
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GYB98339
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NEPSI
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d‖CT5
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GYB97197
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NEPSI
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ia‖CT6
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GYB99412
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NEPSI
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7. Measurement range and tolerance
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model
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graduation mark
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Tolerance level
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I
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II
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tolerance value
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Temperature measurement range ° C
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tolerance value
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Temperature measurement range ° C
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WRN
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K
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±1.5°C
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-40~+375
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±2.5 °C
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-40~+333
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±0.004ltl
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375~1000
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±0.0075 liters
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333~1200
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WRM
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N
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±1.5°C
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-40~+375
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±2.5°C
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-40~+333
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±0.004 liters
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375~1000
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±0.0075 liters
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333~1200
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WRE
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E
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±1.5°C
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-40~+375
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±1.5°C
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-40~+333
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±0.004 liters
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375~800
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±0.004 liters
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333~900
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WRF
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J
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±1.5°C
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-40~+375
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±1.5°C
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-40~+333
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±0.004 liters
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375~750
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±0.004 liters
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333~750
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WRC
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T
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±1.5°C
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-40~+125
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±1°C
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-40~+133
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±0.004 liters
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125~350
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±0.0075 liters
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133~350
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8. Explosion proof grouping form
9. Types of electrical equipment
Class I - Electrical equipment for underground coal mines
Class II - Factory Electrical Equipment
10. Explosion proof grade
The explosion-proof rating of explosion-proof thermocouples is divided into three levels: A, B, and C, based on their maximum safe clearance for use in explosive gas mixtures.
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Category
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Level
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Maximum Test Safety Gap (MESG) mm
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II
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A
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0.9≤MESG
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B
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0.5
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C
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MESG≤0.5
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11. Temperature group
The temperature group of explosion-proof thermocouples is divided into T1-T6 according to the maximum allowable surface temperature of their exposed parts
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Temperature group
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Maximum allowable surface temperature ℃
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T1
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450
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T2
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300
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T3
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200
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T4
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135
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T5
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100
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T6
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85
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12. Explosion proof level
EXdII□T□
EXiaII □T□
Protection level: IP65
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