Location -> Products -> Temperature -> Thermocouple and Thermal Resistance -> Armored Thermocouple
Type：armored thermocouple
Illustrate：It is usually connected with display meter, recording meter and computer, etc. to display measuring temperature of liquid, vapor gas and solid surface ranging from 0℃ to 1300℃ during various production process.
Armored thermocouple
Feature
- With quick response, reducing dynamic error.
- Optional installation methods
- Wide measuring range
- High mechanical strength, good pressure-resistant performance.
Operation Theory
The electrodes of armored thermocouple are made of two different materials. The temperature
difference between measuring end and reference and result in pyroelectric potential, then the
meter indicates the corresponding temperature to the pyroelectric potential.
Main technical parameter
Executive standard
IEC584
GB/T18404-2001
Measuring Range and Tolerance
|
Type |
Graduation |
Tolerance class | |||||
| Ⅰ | Ⅱ | ||||||
| Tolerance value | Measuring range C | Tolerance value | Measuring range C | ||||
| WRNK | K | ± 1.5C | -40~+375 | ± 2.5C | -40~+333 | ||
| ± 0.004|t| | 375~1000 | ± 0.0075|t| | 333~1200 | ||||
| WRMK | N | ± 1.5C | -40~+375 | ± 2.5C | -40~+333 | ||
| ± 0.004|t| | 375~1000 | ± 0.0075|t| | 333~1200 | ||||
| WREK | E | ± 1.5C | -40~+375 | ± 1.5C | -40~+333 | ||
| ± 0.004|t| | 375~800 | ± 0.004|t| | 333~900 | ||||
| WRFK | J | ± 1.5C | -40~+375 | ± 2.5C | -40~+333 | ||
| ± 0.004|t| | 375~750 | ± 0.004|t| | 333~750 | ||||
| WRCK | T | ± 0.5C | -40~+125 | ± 1.0C | -40~+133 | ||
| ± 0.004|t| | 125~350 | ± 0.0075|t| | 133~350 | ||||
| WRPK | S | ± 1C | 0~+1100C | ± 2.5C | 0~600 | ||
| ±[0.003(t-1100)]C | 1100~1600C | ± 0.0025|t| | 600~1600 | ||||
Insulation resistance at normal temperature
The insulation resistance between electrode and protection tube of armored thermocouple is no less
than 1000 MΩ.m under condition that environment temperature is 20 ± 15 C, relative humidity is more
than 80%, and testing voltage is D.C. 500 ± 50V.The insulation resistance of 1M long tested sample is
1000 MΩ.m, and that of 10 M long tested sample is 100 MΩ.m.
Filament Diameter and Material
| Filament form | simplex | duplex | |
| tube diameter | Φ2 Φ3 Φ4 Φ5 Φ6 Φ8 | Φ3 Φ4 Φ5 Φ6 Φ8 | |
|
tube material |
E,J,T | 1Cr18Ni9Ti | 1Cr18Ni9Ti |
| K,N | 1Cr18Ni9Ti GH3030 | 1Cr18Ni9Ti GH3030 | |
| S | GH3039 | GH3039 | |
Threaded head with sleeve type joint
| Code and size |
Outer diameter of armored thermocouple |
|
| Φ8 Φ6 Φ5 | Φ4 Φ3 Φ2 | |
| M | M16*1.5 | M12*1.5 |
| S | 22 | 19 |
Flange with sleeve type joint
| Code and size |
Outer diameter of armored thermocouple |
|
| Φ8 Φ6 Φ5 | Φ4 Φ3 Φ2 | |
| D | Φ60 | Φ50 |
| D0 | Φ42 | Φ36 |
| D1 | Φ24 | Φ20 |
| S | Φ22 | Φ19 |
| d0 | Φ9 | Φ7 |
Operation temperature recommended of armored thermocouple
| Name | Tube material | Outer diameter | Operation temperature | |
| long term | short term | |||
| NiCr-NiSi | 1Cr18Ni9Ti | 2.0 | 600 | 700 |
| 3.0,4.0,5.0,6.0,8.0 | 800 | 900 | ||
| GH3030 | 2.0,3.0 | 800 | 900 | |
| 4.0,5.0 | 900 | 1000 | ||
| 6.0,8.0 | 1000 | 1100 | ||
| NiCrSi-NiSi | 1Cr18Ni9Ti | 2.0 | 600 | 700 |
| 3.0,4.0,5.0,6.0,8.0 | 800 | 900 | ||
| GH3030 | 2.0,3.0 | 900 | 1000 | |
| 4.0,5.0 | 1000 | 1100 | ||
| 6.0,8.0 | 1100 | 1200 | ||
| GH3039 | 2.0,3.0,4.0 | 1000 | 1100 | |
| 5.0,6.0,8.0 | 1100 | 1200 | ||
| NiCr-CuNi | 1Cr18Ni9Ti | 2.0 | 500 | 600 |
| 3.0,4.0,5.0 | 600 | 700 | ||
| 6.0,8.0 | 700 | 800 | ||
| Fe- CuNi | 1Cr18Ni9Ti | 2.0 | 400 | 500 |
| 3.0,4.0,5.0 | 500 | 600 | ||
| 6.0,8.0 | 600 | 750 | ||
| Cu-CuNi | 1Cr18Ni9Ti | 2.0,3.0,4.0,5.0 | 250 | 300 |
| 6.0,8.0 | 300 | 2350 | ||
| PtRh10-Pt | GH3039 | 2.0,3.0,4.0 | 1000 | 1100 |
| 5.0,6.0,8.0 | 1100 | 1200 | ||
Remarks: size R should be indicated in ordering. ( diameter of tube wall or boiler wall)
Type naming method
| W | Temperature instrument | ||||||||
| R | R thermocouple | ||||||||
| Thermal element materials | |||||||||
| P | RtRh10-Pt | ||||||||
| M | NiCrSi-NiSi | ||||||||
| N | NiCr-NiSi | ||||||||
| E | NiCr-CuNi | ||||||||
| C | Cu-CuNi | ||||||||
| F | Fe-CuNi | ||||||||
| K | Armored type | ||||||||
| Filament | |||||||||
| Blank | simplex | ||||||||
| 2 | Duplex | ||||||||
| Mounting &fixing | |||||||||
| 1 | Without fixing device | ||||||||
| 2 | threaded head with fixed fastener | ||||||||
| 3 | threaded head with movable fastener | ||||||||
| 4 | flange with fixed fastener | ||||||||
| 5 | flange with movable fastener | ||||||||
| junction box type | |||||||||
| 2 | Anti-spray type | ||||||||
| 3 | Water-proof type | ||||||||
| 6 | round plug type | ||||||||
| 7 | flat plug type | ||||||||
| 8 | handle type | ||||||||
| 9 | with compensation wire | ||||||||
| measuring end | |||||||||
| 1 | Insulation type | ||||||||
| Attached devices | |||||||||
| M | Contacting block type | ||||||||
| G | hoop type | ||||||||
| W | R | N | K | 2 | 2 | 3 | 1 | M | Model example |
Last：Without the Next：handle type armored thermocouple
