These probes expose the sheathed sensing element directly to the measured medium. Compact water-resistant heads provide terminal connections. Choose an adjustable compression fitting, a fixed process thread or a probe without a fixed mounting device. Aluminum heads are available throughout the range; the fixed-thread configuration also offers a stainless steel head.
| Sensor type | Element | Sheath material | Diameter | Range | Mounting availability | Accuracy options |
|---|---|---|---|---|---|---|
| WRNK Nickel-chromium / nickel-silicon | K | 06Cr18Ni11Ti | 2mm | 0-600°C | Fixed thread | I: ±1.5°C or ±0.4%t; II: ±2.5°C or ±0.75%t |
| 3mm, 4mm, 5mm, 6mm or 8mm | 0-800°C | All three mounting types | ||||
| GH3030 | 3mm, 4mm or 5mm | 0-900°C | ||||
| 6mm or 8mm | 0-1100°C | |||||
| WREK Nickel-chromium / copper-nickel | E | 06Cr18Ni11Ti | 2mm | 0-500°C | Fixed thread | |
| 3mm, 4mm, 5mm, 6mm or 8mm | 0-700°C | All three mounting types | ||||
| WRFK Iron / copper-nickel | J | 2mm | 0-400°C | Fixed thread | ||
| 3mm | All three mounting types | |||||
| 4mm, 5mm, 6mm or 8mm | 0-600°C | |||||
| WRCK Copper / copper-nickel | T | 2mm | -200-300°C | Fixed thread | I: ±0.5°C or ±0.4%t; II: ±1°C or ±0.75%t | |
| 3mm, 4mm, 5mm, 6mm or 8mm | All three mounting types |
| Sensor type | Element | Sheath material | Diameter | Range options | Accuracy | Maximum measuring current | Mounting availability |
|---|---|---|---|---|---|---|---|
| WZPK Platinum RTD | Pt100 | 06Cr18Ni11Ti | 3mm | -200-250°C or -200-420°C | A or B | A: ≤2mA; B: ≤5mA | All three mounting types |
| 4mm, 5mm, 6mm or 8mm | -200-420°C or 0-500°C | ||||||
| 3YC-52 alloy | 0-650°C | ||||||
| WZCK Copper RTD | Cu50 or Cu100 | 06Cr18Ni11Ti | 5mm, 6mm or 8mm | -50-150°C | ±(0.30+0.006t)°C | ≤5mA | Fixed thread |
Pt500 and Pt1000 elements are also listed for the fixed-thread probes; their individual temperature ranges and accuracy values are not specified here.
In the RTD tolerance expressions, t is the absolute temperature magnitude in °C.
| Mounting | Fitting or connection | Head | Electrical entry |
|---|---|---|---|
| Adjustable compression fitting | Stainless steel | Small aluminum head | M20x1.5 |
| Brass | |||
| No fixed mounting | Hex-pressed cold end | ||
| Fixed double-ended threaded fitting | M10x1.5, M16x1.5, M20x1.5 or specified thread; length as required | Aluminum alloy head | M20x1.5 or M24x1.5 |
| NPT1/2, G1/2 or M20x1.5; length as required | Small stainless steel head |
| Sheath diameter | Thread | Thread length | Hexagon across flats | Fitting material |
|---|---|---|---|---|
| 4mm, 5mm, 6mm or 8mm | M16x1.5 | 15mm | 22mm | Stainless steel or brass |
| 3mm | M12x1.5 | 19mm |
| Sheath diameter | Thermocouple insertion length | RTD insertion length | Mounting availability |
|---|---|---|---|
| 8mm | 100-2500mm | All three mounting types | |
| 6mm | 75-4000mm | 75-2000mm | |
| 5mm | 50-4000mm | 75-1500mm | |
| 4mm | 50-10000mm | 50-1000mm | |
| 3mm | 50-15000mm | 50-750mm | |
| 2mm | Specified for the application | Not listed | Fixed thread |
