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As a temperature sensor, thermocouple is usually used with display instruments, recording instruments and signal conditioners. Sheath thermocouple also can be used as a temperature sensing element for assembly thermocouple.
1. S/E/K/J/T type thermocouple temperature range and accuracy chart
| Category | Type of sensing element | Sheath diameter | Normal working temperature | Highest working temperature | Allowable deviation Δt | |
| Measuring range | Permissible deviation | |||||
| Platinum Rhodium 10 - Platinum | S type | ≥Φ3mm | 1100℃ | 1300℃ | 0~1300℃ | ±2.5℃ or ±0.75%t |
| Nickelchromium - Copper nickel | E type | ≥Φ3mm | 600℃ | 700℃ | 0~700℃ | ±2.5℃ or ±0.75%t |
| Nickel chromium - Nickel silicon | K type | ≥Φ3mm | 800℃ | 950℃ | 0~900℃ | ±2.5℃ or ±0.75%t |
| Iron - constantan | J type | ≥Φ3mm | 500℃ | 600℃ | 0~600℃ | Not specified |
| Copper - Copper nickel | T type | ≥Φ3mm | 350℃ | 400℃ | ＜-200℃ | Not specified |
| -40~350℃ | ±1.0℃ or ±0.75%t | |||||
2. Thermal response time of thermocouple
| Sheath diameter (mm) | Thermal response time (s) | |
| Shell type | Insulation type | |
| 2.0 | 0.4 | 0.5 |
| 3.0 | 0.6 | 1.2 |
| 4.0 | 0.8 | 2.5 |
| 5.0 | 1.2 | 4.0 |
| 6.0 | 2.0 | 6.0 |
| 8.0 | 4.0 | 8.0 |
3. Thermocouple wire structure chart
4. Selection chart
| Branch number | Installing form | Mode of connection | Working end form | Multipoint type | Additional device | Sheath diameter | Sheath length |
| B1: Single branch; B2: Double branch | I1: No fixed device; I2: Fixed card sets of thread joint; I3: Movable card sets of thread joint; I4: Fixed card sets of flange; I5: Movable card sets of flange | C0: Simple terminals; C3: Standard waterproof protection head; C4: Explosion-proof protection head; C5: Standard plug; C6: Aviation plug; C7: Handheld; C8: Small waterproof protection head; C9: Direct lead wire | W1: Insulation type; W2: Shell type; W3: Open end type | M3: 3 points; M4: 4 points; M5: 5 points; M6: 6 points | S: Sanitary chuck; H: Heat collector | D3: Φ3; D4: Φ4; D5: Φ5; D6: Φ6; D8: Φ8 | Φ3: 50~15000mm; Φ4: 50~10000mm; Φ5: 50~4000mm; Φ6: 50~2000mm; Φ8: 50~1000mm |
5. Thermocouple installation diagram
Tips: How to select and connect extension wire?
Extension wire is a cheap opened thermocouple which is of the same model with field thermocouple. Its property is basically consistent with standard thermocouple. Model of field extension wire must be consistent with the installed thermocouple. And the specific model can be found from the surface of extension wire by distinguishing color of insulated leather of protective bush within extension wire. If model of extension wire is not correct, there will be errors of temperature measurement. If K type thermocouple is connected with E type extension wire, temperature displayed in the control room will be higher. In a similar way, if E type thermocouple is connected with K type extension wire, the displayed temperature will be lower.