Thermometrics thermowell-mounted RTD assemblies consist of a spring-loaded Pt100 element sized to fit inside a thermowell bore. The separable design allows element replacement and recalibration without breaking the process connection — reducing maintenance cost and eliminating the need for process shutdown during calibration.
| Parameter | Specification |
|---|---|
| Element Type | Pt100 wire-wound, IEC 60751 |
| Accuracy Class | Class A standard; Class B or AA available |
| Wire Config | 3-wire standard; 4-wire available |
| Tip OD | Matched to thermowell bore: 0.260", 0.385", 0.500", custom |
| Spring Force | Matched to ensure tip contact at all temperatures |
| Sheath OD | 1/4" (6.4mm) standard; custom for non-standard thermowell bores |
| Sheath Material | 316SS standard; Inconel 600 for high-temperature service |
| Process Temp Range | −200°C to 600°C standard; to 850°C with ceramic insulation |
| Connection Head | Aluminum Form B NEMA 4X standard; explosion-proof available |
| Quick-Disconnect | Spring-loaded bayonet or threaded lock ring head options |
| Transmitter Insert | 4–20mA HART head-mount transmitter available |
| Calibration | NIST-traceable certificate; element serial number tracked |
A thermowell protects the sensor from process flow, pressure, and corrosion. The separable RTD element slides into the thermowell bore and is held in contact at the closed end by the spring. When recalibration or replacement is required, the element is removed from the head — the thermowell (and the process seal) remains undisturbed. No process shutdown. No valve isolation. No permit-to-work for process entry.
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