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As a temperature sensor, thermocouple assembly is usually used with display instruments, recording instruments and signal conditioners.
1. Thermocouple temperature range chart
| Category | Type of sensing element | Relationship between wire diameter and temperature | ||
| Thermo wire diameter (mm) | Long-term temperature (℃) | Short-tem temperature (℃) | ||
| Platinum Rhodium 30 - Platinum Rhodium 6 | B type | Φ0.5 | 1600 | 1800 |
| Platinum Rhodium 13 - Platinum | R type | Φ0.5 | 1300 | 1600 |
| Platinum Rhodium 10 - Platinum | S type | Φ0.5 | 1300 | 1600 |
| Nickel chromium silicon - Nickel silicon magnesium | N type | Φ0.3 | 700 | 800 |
| Φ0.5 | 800 | 900 | ||
| Φ0.8, Φ1.0 | 900 | 1000 | ||
| Φ1.2, Φ1.6 | 1000 | 1100 | ||
| Φ2.0, Φ2.5 | 1100 | 1200 | ||
| Φ3.2 | 1200 | 1300 | ||
| Nickel chromium - Nickel silicon | K type | Φ0.3 | 700 | 800 |
| Φ0.5 | 800 | 900 | ||
| Φ0.8, Φ1.0 | 900 | 1000 | ||
| Φ1.2, Φ1.6 | 1000 | 1100 | ||
| Φ2.0, Φ2.5 | 1100 | 1200 | ||
| Φ3.2 | 1200 | 1300 | ||
| Nickel chromium - Copper nickel | E type | Φ0.3 | 350 | 450 |
| Φ0.5 | 450 | 550 | ||
| Φ0.8, Φ1.0 | 550 | 650 | ||
| Φ1.2, Φ1.6 | 650 | 750 | ||
| Φ2.0, Φ2.5 | 750 | 900 | ||
| Iron - Constantan | J type | Φ0.3, Φ0.5 | 300 | 400 |
| Φ0.8, Φ1.0 | 400 | 500 | ||
| Φ1.2, Φ1.6 | 500 | 600 | ||
| Φ2.0, Φ2.5 | 600 | 750 | ||
| Copper - Copper nickel | T type | Φ0.2 | 150 | 200 |
| Φ0.3, Φ0.5 | 200 | 250 | ||
| Φ1.0 | 250 | 300 | ||
| Φ1.6 | 350 | 400 | ||
2. Thermowell application temperature range chart
| Thermowell material | Long-term temperature | Short-term temperature |
| Corundum CT1 | 1600 | 1800 |
| High alumina CT2 | 1300 | 1600 |
| Nickel base wrought superalloys 3YC52 | 1300 | 1350 |
| Nickel base wrought superalloys GH3039 | 1250 | 1320 |
| Nickel base superalloys GH3030 | 1200 | 1250 |
| Heat resistant stainless steel 2Cr25Ni20 | 1200 | 1250 |
| Silicon carbide | 1100 | 1150 |
| Stainless steel 316L | 900 | 950 |
| Stainless steel 1Cr18Ni9Ti | 800 | 900 |
3. Thermowell installing form (unit: mm)
4. Selection chart
| Total length of thermowell (L or L*L1) | Branch number | Thermowell installing form | Protection head form | Diameter and material of thermowell |
| 300~2150mm (for I1, I2, I3, I4); 500*500mm, 750*500mm, 750*750mm (for I5); 225~450mm (for I6) | B1: Single branch; B2: Double branch | I0: No thermowell; I1: No fixed device; I2: Fixing thread; I3: Movable flange; I4: Fixed flange; I5: Rectangular movable flange; I6: Taper thermowell and fixing thread | C1: No protection head; C2: All stainless steel protection head; C3: Waterproof protection head; C4: Explosion-proof protection head | D0: Φ16mm; D1: Φ25mm, double-deck; D2: Φ16mm high quality aluminum; D3: Φ20mm high quality aluminum |
Tips: Troubleshooting for thermocouple secondary treatment
Secondary instrument is to compare the introduced millivolt voltage signal with temperature and compensate temperature of the cold side of thermocouple. If model of thermocouple selected in the secondary instrument configuration is not consistent with that of the field, temperature measured through conversion will have errors. If environment temperature measured by temperature measurement thermistor of secondary instrument is not accurate, field temperature through conversion will also have errors. In addition, if secondary instrument is a temperature transmitter which outputs current, temperature range of the output current signals should be consistent with the displayed configuration in the control room.