Serviceable assembled temperature probes
These probes use an assembled construction with ceramic-bead insulation and components that can be disassembled for maintenance or replacement. Choose a black plastic connection head or a water-resistant aluminum head. Thermocouple elements are exposed to air within this construction, so their temperature-to-output characteristics may change during extended service.
Thermocouple elements and protective tubes
| Sensor type | Element | Tube diameter | Tube material | Temperature range | Class I tolerance | Class II tolerance |
|---|
| Nickel-chromium-silicon / nickel-silicon-magnesium | N | 16mm | 06Cr18Ni11Ti | -40-950°C | ±1.5°C or ±0.4%t | ±2.5°C or ±0.75%t |
| 1Cr25Ni20 | 0-1000°C |
| GH3030 | 0-1100°C |
| Nickel-chromium / nickel-silicon | K | 0R1300 or K1230 | 0-1300°C |
| 3YC-52 | 0-1200°C |
| 20mm | High-alumina ceramic | 0-1300°C |
| Nickel-chromium / copper-nickel | E | 16mm | 06Cr18Ni11Ti | -40-900°C |
| Iron / copper-nickel | J | -40-750°C |
| Copper / copper-nickel | T | -40-350°C | ±0.5°C or ±0.4%t | ±1°C or ±0.75%t |
| Platinum-10% rhodium / platinum | S | High-alumina ceramic | 0-1300°C | ±1°C or ±[1+0.003(t-1100)]°C | ±1.5°C or ±0.25%t |
| Platinum-13% rhodium / platinum | R | 20mm | Corundum ceramic |
| Platinum-30% rhodium / platinum-6% rhodium | B | 25mm | 0-1600°C | Not specified |
Platinum and copper resistance elements
| Sensor type | Element | Protective tube | Temperature range | Tolerance | Maximum measuring current |
|---|
| Platinum RTD | Pt100 | 12mm or 16mm; 06Cr18Ni11Ti or 0Cr18Ni12Mo2Ti | -200-420°C | A: ±(0.15+0.002t); B: ±(0.30+0.005t) | ≤5mA |
| Copper RTD | Cu50 | -50-100°C | ±(0.30+0.006t) | ≤10mA |
Mounting, pressure, response and insertion
| Applicable element | Mounting | Protective tube | Nominal pressure | Response time t0.5 | Insertion length |
|---|
| RTD or base-metal thermocouple | Fixed threaded taper | Solid drilled tube | 30MPa | Less than 90s | Thermocouple: 75-1000mm; RTD: 150-1000mm |
| Fixed thread | 16mm metal or stepped tube | 10MPa | 150-2000mm |
| Fixed flange | Determined by flange design |
| No fixed mounting or sliding flange | Atmospheric pressure |
| RTD | Fixed thread | 12mm metal or stepped tube | 10MPa | 150-1000mm |
| Fixed flange | Determined by flange design |
| No fixed mounting or sliding flange | Atmospheric pressure |
| Noble-metal thermocouple | 16mm single ceramic tube | Less than 150s |
| 20mm single ceramic tube | Less than 240s | 150-2000mm |
| 25mm double ceramic tube | Less than 360s |
| Base-metal thermocouple | Right angle | 16mm metal tube | Less than 90s | 400-1000mm |
The 16mm metal and solid drilled protective tubes are specified for base-metal thermocouples with t0.5≤30s. Fixed flanges are welded to the probe body; sliding flanges use cast iron. Fixed threaded taper mounting is intended for media flowing at less than 80m/s.
