Immersion RTD Probes —Pt100 with Lead Wire & Connector

Thermometrics RTD-11 and RTD-12 immersion probes deliver high-accuracy Pt100 temperature measurement in a direct-immersion format. Thin stainless or Inconel sheath, MgO insulation, and field-replaceable design. Available with PTFE lead wire (RTD-11) or quick-disconnect connector (RTD-12).

RTD-11 Lead WireRTD-12 ConnectorPt100 IEC 60751Class A / B / AA316SS / Inconel Sheath2, 3, 4-Wire

Model Selection

RTD Probe Model Guide

Model	Name	Termination	Process Connection	Best For
RTD-11	Pt100 Immersion Probe — PTFE Lead Wire	2, 3, or 4-wire PTFE leads, 24 AWG	None (bare probe)	OEM integration, laboratory, DAQ systems
RTD-12	Pt100 Probe — Industrial Connector	4-pin M12 or standard RTD mini connector	None (bare probe)	Panel instruments, analyzers, quick-disconnect
RTD-13	Pt100 Probe — Tube & Wire, Cut-to-Length	Bare conductors, customer length	None	High-volume OEM; custom sensor harnesses
RTD-14	Pt100 Probe — Threaded Fitting & Lead Wire	PTFE or fibreglass leads	1/2" NPT (standard)	Process pipes, vessels, general immersion
RTD-15	Replacement Pt100 Element — Spring-Loaded	Bare leads or connector	Hex head for thermowell / industrial housing	Drop-in replacement for RTD-70/RTD-80 assemblies

Specifications

RTD Probe Technical Data

Parameter	Specification
Element Type	Pt100 (100 Ω @ 0°C) · Pt1000 on request
Temp Coefficient	α = 0.00385 Ω/Ω/°C (IEC 60751)
Accuracy Class	Class AA (±0.1°C) · Class A (±0.15°C) · Class B (±0.3°C)
Wire Config	2-wire · 3-wire · 4-wire (Kelvin)
Temperature Range	−200°C to 600°C standard; to 850°C with ceramic insulation
Sheath OD	1/8" (3.2mm) · 3/16" (4.8mm) · 1/4" (6.4mm) · custom
Sheath Material	316SS standard · 304SS · Inconel 600 · Hastelloy C276 · Titanium
Insulation	MgO (standard) · Ceramic bead for high-temp
Lead Wire	PTFE 24 AWG standard · Fibreglass · Ceramic-fiber
Response Time (t63)	1–5 sec typical (sheath OD dependent)
Self-Heating Error	<0.1°C at 1 mA excitation (3.2mm OD typical)
Calibration	NIST-traceable R vs T table on request

Accuracy Class at Key Temperatures

Class AA at 0°C±0.10°C
Class A at 0°C±0.15°C
Class B at 0°C±0.30°C
Class AA at 100°C±0.27°C
Class A at 100°C±0.35°C
Class B at 100°C±0.80°C

4-Wire vs 3-Wire

4-wire (Kelvin) configuration eliminates lead resistance entirely, providing the highest measurement accuracy regardless of cable length. 3-wire compensates for lead resistance assuming balanced leads — suitable for most industrial DCS and PLC applications. Use 4-wire for laboratory, metrology, and any application where lead length exceeds 10 meters.