Armored Thermocouple

Armored thermocouple with protective sheath for reliable temperature measurement in harsh industrial and outdoor environments.
Jay He

Product Application

The equipment is typically used in conjunction with display instruments, recording instruments, electronic computers, and similar devices. It is designed for the direct measurement of liquid, steam, and gas media, as well as solid surface temperatures in various production processes, with a measurement range of 0~1300°C.

Product Principle

The electrodes of the Armored Thermocouple consist of two different conductor materials. When a temperature difference exists between the measuring end and the reference end, a thermoelectric potential is generated, and the connected instrument then displays the temperature value corresponding to this potential.

Product Features

  • Short thermal response time, reducing dynamic errors.
  • Flexible mounting/installation.
  • Wide measuring range.
  • High mechanical strength and excellent pressure resistance.
  • Junction box protection rating: IP65, IP66.

Technical Parameters

1. Executive Standard of the Product

  • International standard IEC60584.
  • National standard GB/T18404, GB/T304292.

2. Room Temperature Insulation Resistance

The insulation resistance of the Armored Thermocouple between the electrode and the outer casing must be ≥ 1000 MΩ when measured at an ambient temperature of (20 ± 15)°C, a relative humidity of not more than 80%, and a test voltage of (500 ± 50)V DC. This minimum resistance applies to a 1m-long specimen (1000 MΩ). For a 10m-long specimen, the minimum insulation resistance is 100 MΩ.

3. Temperature measurement range and tolerance

ModelGraduationTolerance level
III
Tolerance valueTemperature rangeTolerance valueTemperature measurement range
WRNKK-40 ~ +375±1.5°C-40 ~ +333±2.5°C
375 ~ 1000±0.004|t|333 ~ 1200±0.0075|t|
WRMKN-40 ~ +375±1.5°C-40 ~ +333±2.5°C
375 ~ 1000±0.004|t|333 ~ 1200±0.0075|t|
WREKE-40 ~ +375±1.5°C-40 ~ +333±2.5°C
375 ~ 800±0.004|t|333 ~ 900±0.0075|t|
WRFKJ-40 ~ +375±1.5°C-40 ~ +333±2.5°C
375 ~ 750±0.004|t|333 ~ 750±0.0075|t|
WRCKT-40 ~ +125±0.5°C-40 ~ +133±1.0°C
125 ~ 350±0.004|t|133 ~ 350±0.0075|t|
WRPKS0 ~ +1100±1.0°C0 ~ 600±1.5°C
1100 ~ 1600±[1+0.003(t-1100)]600 ~ 1600±0.0025|t|
WRQKR0 ~ +1100±1.0°C0 ~ 600±1.5°C
1100 ~ 1600±[1+0.003(t-1100)]600 ~ 1600±0.0025|t|
WRRKB//600 ~ 1700±0.0025|t|

4. Sleeve Material, Outer Diameter, and Maximum Service Temperature

GraduationSleeve MaterialDiameterRecommended maximum service temperature
K0Cr18Ni9Ti0.25250
0.5、1.0400
1.5、2.0600
3.0、4.0、4.5、5.0、6.0、8.0800
GH3030 or Inconel6000.25300
0.5、1.0500
1.5、2.0、3.0800
4.0、4.5、5.0900
6.0、8.01000
N0Cr18Ni9Ti0.25250
0.5、1.0400
1.5、2.0600
3.0、4.0、4.5、5.0、6.0、8.0800
GH3030 or Inconel6000.25300
0.5、1.0500
1.5、2.0、3.0800
4.0、4.5、5.0900
6.0、8.01000
E0Cr18Ni9Ti0.5、1.0400
1.5、2.0500
3.0、4.0、4.5600
5.0、6.0、8.0700
J0Cr18Ni9Ti0.5、1.0300
1.5、2.0400
3.0、4.0、4.5500
5.0、6.0、8.0600
T0Cr18Ni9Ti0.5、1.0200
1.5、2.0、3.0、4.0、4.5250
5.0、6.0、8.0300
SGH30392.0、3.0、4.0、4.51000
5.0、6.0、8.01100
RGH30392.0、3.0、4.0、4.51000
5.0、6.0、8.01100
BGH30392.0、3.0、4.0、4.5、5.0、6.0、8.01200
The sleeve material can be specially customized according to customers' requirements.

5. Thermal Response Time (t0.5)

Measurement end formArmored thermocouple diameter (mm)
0.51.01.52.03.04.04.55.06.08.0
Exposed end type-0.10.20.30.40.50.60.70.81.0
Shell type0.20.20.30.40.60.81.01.22.04.0
Insulation type0.40.60.81.02.02.53.04.06.08.0

Measurement end form

  1. Shell type
  2. Insulation type

Terminal box form

  1. Waterproof
  2. Round plug-in type
  3. Plug-in type
  4. Handle type
  5. Compensating conductor type

6. Installation of fixed devices

  1. Fixed thread
  2. Adjustable ferrule thread
  3. Fixed flange
  4. Adjustable ferrule flange
  5. Welding
  6. Welding
  7. Welding

7. Additional installation form

Specify radian R-value (i.e., pipe wall or furnace opening diameter) when selecting a model.
  1. Contact block type (code M).
  2. Hoop type (code G)

Model Naming Method

W
Temperature Instruments
R
Thermocouples
Temperature sensing element material
NNickel-chromium-nickel-silicon
ENickel-chromium-copper-chromium
MNickel-chromium-silicon-nickel-silicon
JIron-copper-nickel
KCopper-copper-nickel
SPlatinum-rhodium 10-platinum
PPlatinum-rhodium 13-platinum
RPlatinum-rhodium 30-platinum-rhodium 6
K
Armored
Coupling wire pairs
2Double branch
-Single branch
Fixed installation
1No fixed installation
2Fixed thread
3Adjustable ferrule thread
4Fixed flange
5Adjustable ferrule flange
Terminal box type
3Waterproof
6Round plug-in type
7Flat plug-in type
8Handle type
9Compensating conductor type
0Sensing element
Protective tube diameter
2Φ2
3Φ3
4Φ4
5Φ5
6Φ6
8Φ8
Additional device
MContact block type
GHoop type
WRNK2132M
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Structure diagram

  1. WRNK-235 (Fixed thread)
  2. WRNK-435 (Fixed flange)

  1. WRNK-010
  2. WRNK-335 (Adjustable ferrule thread)
  3. WRNK-535 (Adjustable ferrule flange)

  1. WRNK-365
  2. WRNK-275
  3. WRNK-295
  4. WRNK-185

Installation form

  1. Welding of contact block to pipe
  2. Hoop fixing

Selection Instructions

  • Model.
  • Graduation number.
  • Accuracy level.
  • Installation and fixation form.
  • Protective tube material.
  • Length or insertion depth.
Example: Armored thermocouple, K-type, Class I, fixed ferrule thread, protective tube GH3030, length 450mm, insertion depth300mm, WRNK-236, L*| =450*300, Class I, protective tube GH 3030.

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