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Assembled thermocouple
The assembled thermocouple, also known as an industrial thermocouple, is used together with indicating instruments and can measure temperatures in the range of -200 to 1600 °C. It is widely used in aerospace, atomic energy, petroleum, chemical, metallurgical and mechanical sectors as well as in science and technology. Structurally, it consists of a thermocouple element made of thermocouple wires, insulating tubes (beads) and terminals, fitted with various protection tubes, terminal heads and mounting fittings.
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| Code Segment | Meaning & Options | Value in This Example |
|---|---|---|
| W | Temperature instrument | W |
| R | Thermocouple | R |
| N | Thermocouple Type （P:Type S，Q:Type R，R:Type B，N:Type K M:Type N，E:Type E，F:Type J，C:Type T） | N |
| ₂ | No. of Thermocouples (Unmarked: single, 2: dual) | ₂ |
| 2 | Mounting Fitting （1:Without fixing device 2:Fixed thread 3:Loose flange 4:Fixed flange 5:Swivel union 6:Tapered fixed thread 7:Straight union） | 2 |
| 3 | Terminal Head Type （1:Simplified 2:Splash-proof head 3:Waterproof head 4:Flameproof head） | 3 |
| 1 | Protection Tube O.D. （0:φ16mm，1:φ20mm， 2:φ16mm（High-alumina tube） 3:φ25mm（High-alumina tube，Corundum tube marked separately）） | 1 |
| Ⅱ | Accuracy Class （Ⅰ:Class I，Ⅱ:Class II，Ⅲ:Class III） | Ⅱ |
| 650×500 | Total Length × Insertion Length | 650×500 |
| C | Protection Tube Material (1Cr18Ni9Ti unmarked) | C |
| Thermocouple types | Model | Graduation No. | Class I | Class II | Class III | |||
| Measuring Range ℃ | Tolerance °C | Measuring Range ℃ | Tolerance °C | Measuring Range ℃ | Tolerance °C | |||
| PtRh10-Pt (S) | WRP | S | 300～1600 | 1.0 or ±[1+0.003(t-1100)] |
300～1600 | ±1.5 or ±0.25%t |
/ | / |
| PtRh13-Pt (R) | WRQ | R | ||||||
| PtRh30-PtRh6 (B) | WRR | B | / | / | 600～1700 | 600～1700 | ±4.0 or ±0.5%t | |
| NiCr-NiSi (K) | WRN | K | -40～1100 | ±1.5 or ±4.0%t |
-40～1300 | ±2.5 or ±0.75%t |
-200～40 | ±2.5 or ±1.5%t |
| NiCrSi-NiSiMg (N) | WRM | N | ||||||
| NiCr-Constantan (E) | WRE | E | -40～800 | -40～900 | ||||
| Fe-Constantan (J) | WRF | J | -40～750 | -40～750 | / | / | ||
| Cu-Constantan (T) | WRC | T | -40～350 | ±0.5 or ±0.4%t | -40～350 | ±1.0or ±0.75%t | -200～40 | ±1.0 or ±1.5%t |
| Applicable standards | GB/T 16839.1-1997 “Thermocouples — Part 1: Reference tables” GB/T 16839.2-1997 “Thermocouples — Part 2: Tolerances”, JB/T 9238-1999 “Industrial Thermocouples” |
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| Insulation Resistance at Room Temperature | Insulation resistance at high temp. | Test voltage | ||||||
| L≤1m | >1m | ≥100℃ <300℃ |
≥300℃ <500℃ |
≥500℃ <850℃ |
≥850℃ <1000℃ |
≥1000℃ <1300℃ |
≥1300 | 500±50V |
| 100MΩ | 10MΩ | 2MΩ | 0.5MΩ | 0.08MΩ | 0.02MΩ | |||
| Material | Outer dia. (mm) | Thermal Response Time τ 0.5s | Standard length L (mm) |
| Non-metallic | Ø16 | ≤240 | 300，350，400，450，550，650，900，1150，1650，2150 |
| Ø25 | ≤300 | 550，650，900，1150，1650，2150 | |
| Metal | Ø16 | ≤180 | 300，350，400，450，550，650，900，1150，1650，2150，2650 |
| Ø20 | ≤240 | ||
| φ3 | ≤3 | 250，275，300，350，400，450，550，650，750，900，1150 | |
| φ4 | ≤5 | ||
| φ5 | ≤8 | ||
| φ6 | ≤12 | ||
| φ8 | ≤15 | ||
| Tapered | ≤300 | 225，250，300，350，400 | |
| Right angle | 500×500，750×750，500×750，750×500 |
| Code | General purpose type | Special type | |||||||
| A | B | C | Q | R | F | G | H | I | |
| Material | 20#Carbon steel | 1Cr18Ni9Ti | 0Cr25N20 | High-alumina | Corundum | Molybdenum disilicide | Wear-resistant alloy | Heat-resistant alloy | Corrosion-resistant alloy |
| Applicable temperature | ≤500℃ | ≤1000℃ | ≤1100℃ | ≤1300℃ | ≤1600℃ | ≤1100℃ | ≤1300℃ | ≤900℃ | |
| Matching thermoelement wire | K，N，E，J，T | K，N，R，S | R，S，B | K，N，R，S | K，N，E，J，T | ||||
| Remarks | Generally 1Cr18Ni9Ti | Select | Select | Select | Select | Select | Select | ||
For selection guidance, specification confirmation or quotation, please call 0512-57892201, Mobile 13451695112, or submit an online order. Suzhou Dingluxuan Sensor Technology Co., Ltd. provides a complete matching service from temperature sensing elements to complementary ceramic insulation parts.
To order this product or get selection guidance, please call +86 512-57892201 or submit an online order.