|
application
Usually used in conjunction with display instruments, recording instruments, electronic computers, etc., it outputs 4-20mA. It directly measures the temperature of liquid, steam, gas media and solid surfaces within the range of 0-1600 ℃ in various production processes
Working principle
The change in resistance measured by the thermistor during operation generates an unbalanced signal through the bridge of the temperature transmitter, which is amplified and converted into a 4-20mA DC signal for the working instrument to display the corresponding temperature value.
characteristic
·Two line output of 4-20mA, strong anti-interference ability;
·Save the cost of compensating wires and installing temperature transmitters;
·Large measurement range
·Cold end temperature self compensation, non-linear correction circuit
Main technical numbers
Product execution standards
IEC584
IEC751
IEC1515
JB/T7391-94
Temperature measurement range and allowable deviation
thermal resistance
|
model
|
Graduation
|
Measuring range
|
accuracy class
|
Allowable deviation
|
|
WZPB
|
Pt100
|
-200~+500
|
A-level
|
±（0.15+0.002│t│）
|
|
Grade B
|
±（0.30+0.005│t│）
|
|
WZCB
|
Cu50
Cu100
|
-50~+150
|
-
|
±（0.30+0.006│t│）
|
Output signal: 4~20mA, load resistance 250 Ω, transmission wire resistance 100 Ω
Output method: Two line system
Tolerance level: 0.1; 0.2； zero point five
Power supply: 24V DC ± 10%
Protection level: IP65
Insulation resistance: The insulation resistance between the instrument output terminal and the housing should not be less than 50 Ω
Thermal response time: When there is a step change in temperature, the time required for the current output signal of the instrument to change to 50% of the step, usually represented by t0.5. When the step response stabilization time of the temperature transmitter does not exceed one-fifth of the thermal response stabilization time t0.5 of the thermal resistance, the thermal response time of the thermal resistance is used as the thermal response time of the instrument; When the step response stability time of the temperature transmitter does not exceed half of the thermal response stability time t0.5 of the thermal resistance, the thermal response time of the temperature transmitter is used as the thermal response time of the instrument.
Basic error: The basic error of the instrument should not exceed the combined error of the basic errors of the thermistor and temperature transmitter
△ =△1+△2
△1Indicating the allowable deviation of thermal resistance;
△2Indicate the basic error of the transmitter;
work environment
|
Installation site level
|
Temperature ℃
|
Relative humidity%
|
Atmospheric pressure kPa
|
|
C×1
|
-25~+55
|
5~95
|
86~106
|
|
C×2
|
-25~+70
|
|
C×3
|
-40~+80
|
Model and specifications
Selection Notice:2. Model 2. Index number 3. Thermal resistance accuracy level 4. Installation and fixing form 5. Material of protective tube 2. Length or insertion depth
·No fixed device
|
model
|
Graduation
|
Temperature measurement range ℃
|
thermal response time
|
Protective tube material
|
specifications
|
|
d
|
L×1
|
|
WRMB-122
|
N
|
0~1100
|
<120S
|
High alumina
|
φ16
|
300×150
350×200
400×250
450×300
500×400
650×500
900×750
1150×1000
1650×1500
3150×2000
|
|
WRNB-122
|
K
|
|
WRMB-123
|
N
|
φ20
|
|
WRNB-123
|
K
|
|
WRMB-120
WRMB-120G
|
N
|
0~1000
|
<90S
|
0Cr25Ni20
|
φ16
|
|
0~800
|
<24S
|
1Cr18Ni9Ti
|
|
WRNB-120
WRNB-120G
|
K
|
0~1000
|
<90S
|
0Cr25Ni20
|
|
0~800
|
<24S
|
1Cr18Ni9Ti
|
|
WREB-120
WREB-120G
|
E
|
0~600
|
<90S
|
1Cr18Ni9Ti
|
|
<24S
|
|
WRCB-120
WRCB-120G
|
T
|
0~350
|
<90S
|
|
<24S
|
|
WRFB-120
WRFB-120G
|
J
|
0~500
|
<90S
|
|
<24S
|
|
WZPB-121
WZPB-121G
|
Pt100
|
-200~500
|
<120S
|
1Cr18Ni9Ti
|
φ12
|
|
<24S
|
|
WZCB-121
WZCB-121G
|
Cu50
Cu100
|
-50~150
|
<120S
|
|
<24S
|
·Fixed thread type
|
model
|
Graduation
|
Temperature measurement range ℃
|
thermal response time
|
Protective tube material
|
specifications
|
|
d
|
L×1
|
|
WRMB-120
WRMB-120G
|
N
|
0~1000
|
<90S
|
0Cr25Ni20
|
φ16
|
300×150
350×200
400×250
450×300
500×400
650×500
900×750
1150×1000
1650×1500
3150×2000
|
|
0~800
|
<24S
|
1Cr18Ni9Ti
|
|
WRNB-120
WRNB-120G
|
K
|
0~1000
|
<90S
|
0Cr25Ni20
|
|
0~800
|
<24S
|
1Cr18Ni9Ti
|
|
WREB-120
WREB-120G
|
E
|
0~600
|
<90S
|
1Cr18Ni9Ti
|
|
<24S
|
|
WRCB-120
WRCB-120G
|
T
|
0~350
|
<90S
|
|
<24S
|
|
WRFB-120
WRFB-120G
|
J
|
0~500
|
<90S
|
|
<24S
|
|
WZPB-121
WZPB-121G
|
Pt100
|
-200~500
|
<120S
|
1Cr18Ni9Ti
|
φ12
|
|
<24S
|
|
WZCB-121
WZCB-121G
|
Cu50
Cu100
|
-50~150
|
<120S
|
|
<24S
|
|
|
|
|
|
|
|
|
·Activity flange type
|
model
|
Graduation
|
Temperature measurement range ℃
|
thermal response time
|
Protective tube material
|
specifications
|
|
d
|
L
|
|
WRMB-320
WRMB-320G
|
N
|
0~1000
|
<90S
|
0Cr25Ni20
|
φ16
|
300
350
400
450
500
650
900
1150
1650
2150
|
|
0~800
|
<24S
|
1Cr18Ni9Ti
|
|
WRNB-320
WRNB-320G
|
K
|
0~1000
|
<90S
|
0Cr25Ni20
|
|
0~800
|
<24S
|
1Cr18Ni9Ti
|
|
WREB-320
WREB-320G
|
E
|
0~600
|
<90S
|
1Cr18Ni9Ti
|
|
<24S
|
|
WRCB-320
WRCB-320G
|
T
|
0~350
|
<90S
|
|
<24S
|
|
WRFB-320
WRFB-320G
|
J
|
0~500
|
<90S
|
|
<24S
|
|
WZPB-321
WZPB-321G
|
Pt100
|
-200~500
|
<120S
|
1Cr18Ni9Ti
|
φ12
|
|
<24S
|
|
WZCB-321
WZCB-321G
|
Cu50
Cu100
|
-50~150
|
<120S
|
|
<24S
|
|
|
|
|
|
|
|
|
·Fixed flange type
|
model
|
Graduation
|
Temperature measurement range ℃
|
thermal response time
|
Protective tube material
|
specifications
|
|
d
|
L×1
|
|
WRMB-420
WRMB-420G
|
N
|
0~1000
|
<90S
|
0Cr25Ni20
|
φ16
|
300×150
350×200
400×250
450×300
500×400
650×500
900×750
1150×1000
1650×1500
3150×2000
|
|
0~800
|
<24S
|
1Cr18Ni9Ti
|
|
WRNB-420
WRNB-420G
|
K
|
0~1000
|
<90S
|
0Cr25Ni20
|
|
0~800
|
<24S
|
1Cr18Ni9Ti
|
|
WREB-420
WREB-420G
|
E
|
0~600
|
<90S
|
1Cr18Ni9Ti
|
|
<24S
|
|
WRCB-420
WRCB-420G
|
T
|
0~350
|
<90S
|
|
<24S
|
|
WRFB-420
WRFB-420G
|
J
|
0~500
|
<90S
|
|
<24S
|
|
WZPB-421
WZPB-421G
|
Pt100
|
-200~500
|
<120S
|
1Cr18Ni9Ti
|
φ12
|
|
<24S
|
|
WZCB-421
WZCB-421G
|
Cu50
Cu100
|
-50~150
|
<120S
|
|
<24S
|
|
|
|
|
|
|
|
|
·Fixed thread conical blue type
|
model
|
Graduation
|
Temperature measurement range ℃
|
thermal response time
|
Protective tube material
|
specifications
|
|
d
|
L×1
|
|
WRMB-420
WRMB-420G
|
N
|
0~1000
|
<90S
|
0Cr25Ni20
|
φ15
|
300×150
350×200
400×250
450×300
500×400
|
|
0~800
|
1Cr18Ni9Ti
|
|
WRNB-420
WRNB-420G
|
K
|
0~1000
|
0Cr25Ni20
|
|
0~800
|
1Cr18Ni9Ti
|
|
WREB-420
WREB-420G
|
E
|
0~600
|
1Cr18Ni9Ti
|
|
WRCB-420
WRCB-420G
|
T
|
0~350
|
|
WRFB-420
WRFB-420G
|
J
|
0~500
|
|
WZPB-421
WZPB-421G
|
Pt100
|
-200~500
|
<90S
|
1Cr18Ni9Ti
|
|
WZCB-421
WZCB-421G
|
Cu50
Cu100
|
-50~150
|
·Flexible tube connector type
|
model
|
Graduation
|
Temperature measurement range ℃
|
thread specification
|
Protective tube material
|
specifications
|
|
d
|
L1
|
|
WRMB-52
WRMB-52A
|
N
|
0~1000
|
M20×1.5
|
1Cr18Ni9Ti
|
φ3
φ4
φ5
φ6
φ8
|
245
270
295
345
395
445
545
645
745
899
1149
|
|
NPT1/2
|
|
WRNB-52
WRNB-52A
|
K
|
M20×1.5
|
|
NPT1/2
|
|
WREB-52
WREB-52A
|
E
|
0~600
|
M20×1.5
|
|
NPT1/2
|
|
WRCB-52
WRCB-52A
|
T
|
0~350
|
M20×1.5
|
|
NPT1/2
|
|
WRFB-52
WRFB-52A
|
J
|
0~500
|
M20×1.5
|
|
NPT1/2
|
|
WZPB-52
WZPB-52A
|
Pt100
|
-200~500
|
M20×1.5
|
1Cr18Ni9Ti
|
φ5
φ6
φ8
|
|
NPT1/2
|
|
WZCB-52
WZCB-52A
|
Cu50
Cu100
|
-50~150
|
M20×1.5
|
|
NPT1/2
|
·Straight pipe joint type
|
model
|
Graduation
|
Temperature measurement range ℃
|
thread specification
|
Protective tube material
|
specifications
|
|
d
|
L1
|
|
WRMB-72
WRMB-72A
|
N
|
0~1000
|
M20×1.5
|
1Cr18Ni9Ti
|
φ3
φ4
φ5
φ6
φ8
|
245
270
295
345
395
445
545
645
745
899
1149
|
|
NPT1/2
|
|
WRNB-72
WRNB-72A
|
K
|
M20×1.5
|
|
NPT1/2
|
|
WREB-72
WREB-72A
|
E
|
0~600
|
M20×1.5
|
|
NPT1/2
|
|
WRCB-72
WRCB-72A
|
T
|
0~350
|
M20×1.5
|
|
NPT1/2
|
|
WRFB-72
WRFB-72A
|
J
|
0~500
|
M20×1.5
|
|
NPT1/2
|
|
WZPB-72
WZPB-72A
|
Pt100
|
-200~500
|
M20×1.5
|
1Cr18Ni9Ti
|
φ5
φ6
φ8
|
|
NPT1/2
|
|
WZCB-72
WZCB-72A
|
Cu50
Cu100
|
-50~150
|
M20×1.5
|
|
NPT1/2
|
·Fixed threaded pipe joint type
|
model
|
Graduation
|
Temperature measurement range ℃
|
thread specification
|
Protective tube material
|
specifications
|
|
d
|
L1
|
|
WRMB-82
WRMB-82A
|
N
|
0~1000
|
M20×1.5
|
1Cr18Ni9Ti
|
φ3
φ4
φ5
φ6
φ8
|
245
270
295
345
395
445
545
645
745
899
1149
|
|
NPT1/2
|
|
WRNB-82
WRNB-82A
|
K
|
M20×1.5
|
|
NPT1/2
|
|
WREB-82
WREB-82A
|
E
|
0~600
|
M20×1.5
|
|
NPT1/2
|
|
WRCB-82
WRCB-82A
|
T
|
0~350
|
M20×1.5
|
|
NPT1/2
|
|
WRFB-82
WRFB-82A
|
J
|
0~500
|
M20×1.5
|
|
NPT1/2
|
|
WZPB-82
WZPB-82A
|
Pt100
|
-200~500
|
M20×1.5
|
1Cr18Ni9Ti
|
φ5
φ6
φ8
|
|
NPT1/2
|
|
WZCB-82
WZCB-82A
|
Cu50
Cu100
|
-50~150
|
M20×1.5
|
|
NPT1/2
|
·Active threaded pipe joint type
|
model
|
Graduation
|
Temperature measurement range ℃
|
thread specification
|
Protective tube material
|
specifications
|
|
d
|
L1
|
|
WRMB-92
WRMB-92A
|
N
|
0~1000
|
M20×1.5
|
1Cr18Ni9Ti
|
φ3
φ4
φ5
φ6
φ8
|
245
270
295
345
395
445
545
645
745
899
1146
|
|
NPT1/2
|
|
WRNB-92
WRNB-92A
|
K
|
M20×1.5
|
|
NPT1/2
|
|
WREB-92
WREB-92A
|
E
|
0~600
|
M20×1.5
|
|
NPT1/2
|
|
WRCB-92
WRCB-92A
|
T
|
0~350
|
M20×1.5
|
|
NPT1/2
|
|
WRFB-92
WRFB-92A
|
J
|
0~500
|
M20×1.5
|
|
NPT1/2
|
|
WZPB-92
WZPB-92A
|
Pt100
|
-200~500
|
M20×1.5
|
1Cr18Ni9Ti
|
φ5
φ6
φ8
|
|
NPT1/2
|
|
WZCB-92
WZCB-92A
|
Cu50
Cu100
|
-50~150
|
M20×1.5
|
|
NPT1/2
|
|
