Location -> Products -> Temperature -> Thermocouple and Thermal Resistance -> Explosion-proof Thermal Resistance
Type：explosion-proof thermal resistance2
Illustrate： It is usually connected with display meter, recording meter and computer, etc. to directly measure temperature of liquid, vapor, gas and solid surface ranging from -200℃ to 500℃ with exploxives such as hydrocarbon on production spot.
Explosion-proof Thermal Resistance
It is usually connected with display meter, recording meter and computer, etc. to directly measure temperature of liquid, vapor, gas and solid surface ranging from -200℃ to 500℃ with exploxives such as hydrocarbon on production spot.
Features
Spring thermal element with good shock-proof performance;
High measuring accuracy;
No compensational wire, spare cost;
Imported film resistor with high reliability and stability
Operation Theory
Explosion-proof thermal resistance has a junction box of enough strength with gaps inside it. All spare parts which might produce spark, electric arc, and dangerous high temperature are sealed in the junction box. When explosion within the box happens, fire and high temperature caused by explosion could be extincted and cooled. Thus, explosion separation could be realized.
Main Technical Parameters
Executive Standard
IEC751
JB/T8622-1997
JB/T8623-1997
JB/T5518-1991
Insulation Resistance at Normal Temperature
The insulation resistance between electrode and protection tube of the thermocouple shall be no less than 100 MΩ under condition that environment temperature is 15~35℃, relative humidity is no more than 80%, and testing voltage is D.C.10~100V.
Measuring Range & Tolerance
| Type | Graduation | Measuring Range ℃ | Accuracy | Tolerance |
| WZP | Pt100 | -200~+500 | A | ±(0.15+0.002) ltl |
| WZC |
Cu50 Cu100 |
-50~+100 | B | ±(0.30+0.005) ltl |
| --- | ±(0.30+0.005) ltl |
Remarks: t is absolute value actually tested with thermal sensor.
Certificates List
| Explosion-proof Class | Certificate No. | Certifying institution |
| d ⅡBT4 | GYB96451 | NEPSI |
| d ⅡBT4 | GYB96452 | NEPSI |
| d ⅡCT5 | GYB98338 | NEPSI |
| d ⅡCT5 | GYB97178 | NEPSI |
| iaⅡCT6 | GYB99413 | NEPSI |
Remarks: NEPSI National Explosion-Proof Security Inspection
Indication of Explosion-proof Function
| d Ⅱ □ T□ | |||||||
| Temperature Group: T1-T6 | |||||||
| Explosion-proof Class: A, B, C | |||||||
| Electric Equipment for plant | |||||||
| Explosion Separation Type | |||||||
| Intrinsic Safety Type | |||||||
Electric Equipment Category
I –Electric Equipment for Coal Mine Well
II –Electric Equipment for Plant
Explosion-proof Class
It is divided into Class A, B, and C according to maximum test safety gap in explosive gas compound.
| Category | Class | Max.Test Safety Gap |
| Ⅱ | A | 0.9≤MESG |
| B | 0.5＜MESG＜0.9 | |
| C | MESG≤0.5 |
Temperature Group
It includes T1-T6 according to maximum surface temperature allowed of open part.
| Temperature Group | Max. Surface Temperature Allowed |
| T1 | 450 |
| T2 | 300 |
| T3 | 200 |
| T4 | 135 |
| T5 | 100 |
| T6 | 85 |
Junction Box Figure
Class d II BT Class d II CT
Terminal Figure
Type Naming Method
| W | Temperature Instrument | |||||||
| z | Thermal Resistance | |||||||
| Thermal Element Material | ||||||||
| P | P Pt | |||||||
| C | C Cu | |||||||
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Filament | |||||||
| blank Simplex | ||||||||
| 2 Duplex | ||||||||
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Mounting &fixing | |||||||
| 1 Without fixing device | ||||||||
| 2 Threaded connector | ||||||||
| 3 Movable Flange | ||||||||
| 4 Fixed flange | ||||||||
| 5 Elbow tube connector | ||||||||
| 6 Fixed threaded Cone connector | ||||||||
| 7 Straight tube connector | ||||||||
| 8 Fixed threaded tube connector | ||||||||
| 9 Movable threaded tube connector | ||||||||
| Junction box | ||||||||
| 4 Explosion-proof Type | ||||||||
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Protection Tube Diameter | |||||||
| 0Φ16 | ||||||||
| 1Φ12 | ||||||||
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Measuring End G Variable cross section |
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| W | Z | P | 2 | 2 | 4 | 1 | G | Model example |
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