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                                                      Type:Explosion-proof Thermocouple

                                                      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 0℃ to 1300℃ with explosives such as hydrocarbon on production spot.

                                                      Explosion-proof Thermocouple

                                                       

                                                      Application
                                                      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 0℃ to 1300℃ with explosives such as hydrocarbon on production spot.

                                                      Features
                                                      Various explosion-proof types, good explosion-proof performance
                                                      Spring thermal element with good shock-proof performance
                                                      Wide measuring range
                                                      High mechanical strength, good pressure-resistant performance

                                                      Operation Theory
                                                      Explosion-proof thermocouple 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 with the gap. Thus, explosion separation could be realized.
                                                       
                                                      Main Technical Parameters
                                                      Executive Standard
                                                      IEC584
                                                      GB/T16839-1997
                                                      JB/T5518-1991
                                                      GB3836
                                                       
                                                      Insulation Resistance at Normal Temperature
                                                      The insulation resistance between electrode and protection tube of the thermocouple shall be no less than 1000MΩ m under condition that environment temperature is 20±15℃,relative humidity is more than 80%, and testing voltage is D.C.500V ±50V.
                                                       

                                                      Certificates List 

                                                      Explosion-proof Class Certificate No. Certifying institution 
                                                      d ⅡBT4 GTB96450 NEPSI
                                                      d ⅡBT4 GTB96453 NEPSI
                                                      d ⅡCT5 GTB98339 NEPSI
                                                      d ⅡCT5 GTB97197 NEPSI
                                                      iaⅡCT6 GTB99412 NEPSI

                                                      Remarks: NEPSI National Explosion-Proof Security Inspection 
                                                       
                                                       
                                                      Measuring Range & Tolerance


                                                       

                                                      Type Graduation Tolerance Class
                                                      I II
                                                      Tolerance Value Measuring Range °C Tolerance Value Measuring Range °C
                                                      WRN K ±1.5°C -40~+375 ±2.5 °C -40~+333
                                                      ±0.004ltl 375~1000 ±0.0075 ltl 333~1200
                                                      WRM N ±1.5°C -40~+375 ±2.5°C -40~+333
                                                      ±0.004 ltl 375~1000 ±0.0075 ltl 333~1200
                                                      WRE E ±1.5°C -40~+375 ±1.5°C -40~+333
                                                      ±0.004 ltl 375~800 ±0.004 ltl 333~900
                                                      WRF J ±1.5°C -40~+375 ±1.5°C -40~+333
                                                      ±0.004 ltl 375~750 ±0.004 ltl 333~750
                                                      WRC T ±1.5°C -40~+125 ±1°C -40~+133
                                                      ±0.004 ltl 125~350 ±0.0075 ltl 133~350

                                                       
                                                      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
                                                      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

                                                       
                                                      Explosion-proof Class
                                                      EXd II □ T □
                                                      EXia II □T □
                                                       
                                                      Protection Class
                                                      IP65
                                                      Junction Box 
                                                       
                                                       
                                                      Terminal
                                                       
                                                       
                                                       
                                                      Type Naming Method 
                                                       

                                                      W Temperature instrument
                                                        R Thermocouple
                                                          Thermal Element Material
                                                      M NiCrSi-NiSi
                                                      N NiCr-NiSi
                                                      E NiCr-CuNi 
                                                      F Fe- CuNi
                                                      C Cu- CuNi
                                                         
                                                       
                                                      Filament
                                                      blank Simplex  
                                                      2       2 Duplex  
                                                       
                                                       
                                                      Mounting &fixing
                                                      1 Without fixing device
                                                      2 Threaded connector
                                                      4 Fixed flange
                                                      5 Elbow tube connector
                                                      7 Straight tube connector
                                                      8 Fixed threaded tube connector
                                                      9 Movable threaded tube connector
                                                        Junction box
                                                      4 Explosion-proof Type
                                                       
                                                       
                                                      Protection Tube Diameter
                                                        0Φ16 
                                                        Measuring End 
                                                      G Variable cross section
                                                      W R N 2 2 4 0 G Model example


                                                       

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                                                      Contact Us

                                                      Office Address: Room 402, No. 650, Xinzhuan Rd., Jiuting Town, Songjiang District, Shanghai, China (Mainland)

                                                      Phone:021-57635022

                                                      E-mail:info@gnflowmeter.com

                                                      E-mail:sales@gninstruments.com

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