|
application
Usually used in conjunction with display instruments, recording instruments, electronic computers, etc. Directly measure the temperature of liquid, vapor, gas media, and solid surfaces within the range of 0-1300 ℃ in the presence of hydrocarbon explosions on the production site.
characteristic
·Multiple explosion-proof forms with good explosion-proof performance;
·Pressure spring type temperature sensing element with good anti vibration performance;
·Large measurement range;
·High mechanical strength and good pressure resistance.
Working principle
Explosion proof thermocouples use the principle of gap 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 enabling temperature measurement.
Main technical numbers
Product execution standards
IEC584
IEC1515
GB/T16839-1997
GB3836-2000
JB/T5518-91
Temperature measurement range and allowable deviation
|
model
|
Graduation
|
Tolerance level
|
|
Ⅰ
|
Ⅱ
|
|
Allowable deviation
|
Temperature measurement range ℃
|
Allowable deviation
|
Temperature measurement range ℃
|
|
WRN
|
K
|
±1.5℃
|
-40~+375
|
±2.5℃
|
-40~+333
|
|
±0.004│t│
|
375~1000
|
±0.0075│t│
|
333~1200
|
|
WRM
|
N
|
±1.5℃
|
-40~+375
|
±2.5℃
|
-40~+333
|
|
±0.004│t│
|
375~1000
|
±0.0075│t│
|
333~1200
|
|
WRE
|
E
|
±1.5℃
|
-40~+375
|
±2.5℃
|
-40~+333
|
|
±0.004│t│
|
375~800
|
±0.0075│t│
|
333~900
|
|
WRF
|
J
|
±1.5℃
|
-40~+375
|
±2.5℃
|
-40~+333
|
|
±0.004│t│
|
375~750
|
±0.0075│t│
|
333~750
|
|
WRC
|
T
|
±1.5℃
|
-40~+125
|
±1℃
|
-40~+133
|
|
±0.004│t│
|
125~350
|
±0.0075│t│
|
133~350
|
Note: t is the measured temperature of the tested thermocouple.
Room temperature insulation resistance
The armored couple is tested at an ambient temperature of 15-35 ℃, with a relative temperature not exceeding 80%, and a test voltage of 500 ± 50V (DC). The insulation resistance between the electrode and the outer sleeve is ≥ 100 M Ω· m.
List of Evidence Collection
|
Explosion proof grade
|
Explosion proof certificate number
|
certificate authority
|
|
dⅡBT4
|
GYB02544
|
NEPSI
|
|
dⅡBT5
|
GYB02562
|
NEPSI
|
|
dⅡCT4
|
GYB02621
|
NEPSI
|
|
dⅡCT5
|
GYB02632
|
NEPSI
|
|
iaⅡCT5
|
GYB02653
|
NEPSI
|
Note: NEPSI Explosion proof Certification System ****** Instrument Explosion proof Safety Supervision Station
Electrical equipment category
I - Electrical equipment for underground coal mines
II - Electrical equipment for factories
Explosion proof grade
The explosion-proof grade of explosion-proof thermocouples is divided into three levels: A, B, and C according to their safety clearance for use in explosive gas mixtures.
|
category
|
level
|
****Test safety gap (MESG) mm
|
|
Ⅱ
|
A
|
0.9≤MESG
|
|
B
|
0.5<><>< div=''>
|
|
C
|
MESG≤0.5
|
Temperature group
The temperature group of explosion-proof hotspots is divided into T1-T6 according to the allowable high surface temperature of their exposed parts.
|
Temperature group
|
Allow * high surface temperature ℃
|
|
T1
|
450
|
|
T2
|
300
|
|
T3
|
200
|
|
T4
|
135
|
|
T5
|
100
|
|
T6
|
85
|
Explosion proof level
EXdⅡ□T□
ExiaⅡ□T□
Protection level:IP65
Model and specifications
Selection Notice:1. Model; 2. Division number; Explosion proof rating; 4. Accuracy level; 5. Fixed installation form; ⒍ Material of protective tube; 7. Length or insertion depth
·Fixed thread thermocouple
|
model
|
Graduation
|
Temperature measurement range ℃
|
thermal response time
|
Protective tube material
|
specifications
|
|
d
|
L×1
|
|
WRM-240
WRM 2-240
|
N
|
0~800
|
<90S
|
1Cr18Ni9Ti
|
φ16
|
300×150
350×200
400×250
450×300
500×350
550×400
650×500
900×700
1150×1000
1650×1500
2150×2000
|
|
0~1000
|
0Cr25Ni20
|
|
WRM-240A
WRM 2-240A
|
0~800
|
<24S
|
1Cr18Ni9Ti
|
|
0~1000
|
0Cr25Ni20
|
|
WRN-240
WRN 2-240
|
K
|
0~800
|
<90S
|
1Cr18Ni9Ti
|
|
0~1000
|
0Cr25Ni20
|
|
WRN-240A
WRN 2-240A
|
0~800
|
<24S
|
1Cr18Ni9Ti
|
|
0~1000
|
0Cr25Ni20
|
|
WRE-240
WRE 2-240
|
E
|
0~700
|
<90S
|
1Cr18Ni9Ti
|
|
WRE-240A
WRE 2-240A
|
<24S
|
|
WRC-240
WRC 2-240
|
T
|
0~350
|
<90S
|
1Cr18Ni9Ti
|
|
WRC-240A
WRC 2-240A
|
<24S
|
|
WRF-240
WRF 2-240
|
J
|
0~600
|
<90S
|
1Cr18Ni9Ti
|
|
WRF-240A
WRF 2-240A
|
<24S
|
·No fixed device thermocouple
|
model
|
Graduation
|
Temperature measurement range ℃
|
Protective tube material
|
specifications
|
|
d
|
L
|
|
WRM-140
WRM 2-140
|
N
|
0~800
|
1Cr18Ni9Ti
|
φ16
|
150
200
250
300
350
400
500
750
1000
1500
2000
|
|
0~1000
|
0Cr25Ni20
|
|
WRM-140A
WRM 2-140A
|
0~800
|
1Cr18Ni9Ti
|
|
0~1000
|
0Cr25Ni20
|
|
WRN-140
WRN 2-140
|
K
|
0~800
|
1Cr18Ni9Ti
|
|
0~1000
|
0Cr25Ni20
|
|
WRN-140A
WRN 2-140A
|
0~800
|
1Cr18Ni9Ti
|
|
0~1000
|
0Cr25Ni20
|
|
WRE-140
WRE 2-140
|
E
|
0~700
|
1Cr18Ni9Ti
|
|
WRE-140A
WRE 2-140A
|
|
WRC-140
WRC 2-140
|
T
|
0~350
|
1Cr18Ni9Ti
|
|
WRC-140A
WRC 2-140A
|
|
WRF-140
WRF 2-140
|
J
|
0~600
|
1Cr18Ni9Ti
|
|
WRF-140A
WRF 2-140A
|
·Fixed flange thermocouple
|
model
|
Graduation
|
Temperature measurement range ℃
|
thermal response time
|
Protective tube material
|
specifications
|
|
d
|
L×1
|
|
WRM-440
WRM 2-440
|
N
|
0~800
|
<90S
|
1Cr18Ni9Ti
|
φ16
|
300×150
350×200
400×250
450×300
500×350
550×400
650×500
900×700
1150×1000
1650×1500
2150×2000
|
|
0~1000
|
0Cr25Ni20
|
|
WRM-440A
WRM 2-440A
|
0~800
|
<24S
|
1Cr18Ni9Ti
|
|
0~1000
|
0Cr25Ni20
|
|
WRN-440
WRN 2-440
|
K
|
0~800
|
<90S
|
1Cr18Ni9Ti
|
|
0~1000
|
0Cr25Ni20
|
|
WRN-440A
WRN 2-440A
|
0~800
|
<24S
|
1Cr18Ni9Ti
|
|
0~1000
|
0Cr25Ni20
|
|
WRE-440
WRE 2-440
|
E
|
0~700
|
<90S
|
1Cr18Ni9Ti
|
|
WRE-440A
WRE 2-440A
|
<24S
|
|
WRC-440
WRC 2-440
|
T
|
0~350
|
<90S
|
1Cr18Ni9Ti
|
|
WRC-440A
WRC 2-440A
|
<24S
|
|
WRF-440
WRF 2-440
|
J
|
0~600
|
<90S
|
1Cr18Ni9Ti
|
|
WRF-440A
WRF 2-440A
|
<24S
|
·Flexible tube joint thermocouple
|
model
|
Graduation
|
Temperature measurement range ℃
|
thermal response time
|
specifications
|
|
d
|
L×1
|
|
WRM-54
WRM 2-54
|
N
|
0~1000
|
<90S
|
φ16
|
300×150
350×200
400×250
450×300
500×350
550×400
650×500
900×700
1150×1000
1650×1500
2150×2000
|
|
0~800
|
|
WRM-54A
WRM 2-54A
|
0~1000
|
<24S
|
|
0~800
|
|
WRN-54
WRN 2-54
|
K
|
0~1000
|
<90S
|
|
0~800
|
|
WRN-54A
WRN 2-54A
|
0~1000
|
<24S
|
|
0~800
|
|
WRE-54
WRE 2-54
|
E
|
0~600
|
<90S
|
|
WRE-54A
WRE 2-54A
|
<24S
|
|
WRC-54
WRC 2-54
|
T
|
0~350
|
<90S
|
|
WRC-54A
WRC 2-54A
|
<24S
|
|
WRF-54
WRF 2-54
|
J
|
0~600
|
<90S
|
|
WRF-54A
WRF 2-54A
|
<24S
|
·Straight tube joint thermocouple
|
model
|
Graduation
|
Temperature measurement range ℃
|
thermal response time
|
specifications
|
|
d
|
L
|
|
WRM-74
WRM 2-74
|
N
|
0~1000
|
M20×1.5
|
φ3
φ4
φ5
φ6
φ8
|
250
275
300
350
400
450
550
650
750
900
1150
|
|
0~800
|
|
WRM-74A
WRM 2-74A
|
0~1000
|
NPT1/2
|
|
0~800
|
|
WRN-74
WRN 2-74
|
K
|
0~1000
|
M20×1.5
|
|
0~800
|
|
WRN-74A
WRN 2-74A
|
0~1000
|
NPT1/2
|
|
0~800
|
|
WRE-74
WRE 2-74
|
E
|
0~600
|
M20×1.5
|
|
WRE-74A
WRE 2-74A
|
NPT1/2
|
|
WRC-74
WRC 2-74
|
T
|
0~350
|
M20×1.5
|
|
WRC-74A
WRC 2-74A
|
NPT1/2
|
|
WRF-74
WRF 2-74
|
J
|
0~600
|
M20×1.5
|
|
WRF-74A
WRF 2-74A
|
NPT1/2
|
·Fixed threaded pipe joint thermocouple
|
model
|
Graduation
|
Temperature measurement range ℃
|
thermal response time
|
specifications
|
|
d
|
L
|
|
WRM-84
WRM 2-84
|
N
|
0~1000
|
M20×1.5
|
φ3
φ4
φ5
φ6
φ8
|
250
275
300
350
400
450
550
650
750
900
1150
|
|
0~800
|
|
WRM-84A
WRM 2-84A
|
0~1000
|
NPT1/2
|
|
0~800
|
|
WRN-84
WRN 2-84
|
K
|
0~1000
|
M20×1.5
|
|
0~800
|
|
WRN-84A
WRN 2-84A
|
0~1000
|
NPT1/2
|
|
0~800
|
|
WRE-84
WRE 2-84
|
E
|
0~600
|
M20×1.5
|
|
WRE-84A
WRE 2-84A
|
NPT1/2
|
|
WRC-84
WRC 2-84
|
T
|
0~350
|
M20×1.5
|
|
WRC-84A
WRC 2-84A
|
NPT1/2
|
|
WRF-84
WRF 2-84
|
J
|
0~500
|
M20×1.5
|
|
WRF-84A
WRF 2-84A
|
NPT1/2
|
·Active threaded pipe joint thermocouple
|
model
|
Graduation
|
Temperature measurement range ℃
|
thermal response time
|
specifications
|
|
d
|
L
|
|
WRM-94
WRM 2-94
|
N
|
0~1000
|
M20×1.5
|
φ3
φ4
φ5
φ6
φ8
|
250
275
300
350
400
450
550
650
750
900
1150
|
|
0~800
|
|
WRM-94A
WRM 2-94A
|
0~1000
|
NPT1/2
|
|
0~800
|
|
WRN-94
WRN 2-94
|
K
|
0~1000
|
M20×1.5
|
|
0~800
|
|
WRN-94A
WRN 2-94A
|
0~1000
|
NPT1/2
|
|
0~800
|
|
WRE-94
WRE 2-94
|
E
|
0~600
|
M20×1.5
|
|
WRE-94A
WRE 2-94A
|
NPT1/2
|
|
WRC-94
WRC 2-94
|
T
|
0~350
|
M20×1.5
|
|
WRC-94A
WRC 2-94A
|
NPT1/2
|
|
WRF-94
WRF 2-94
|
J
|
0~500
|
M20×1.5
|
|
WRF-94A
WRF 2-94A
|
NPT1/2
|
|
