RTDs / Probe RTD Assemblies
Series 21 - Wide Range 1/4” Probes
Complete family of 1/4" diameter probes including hermetic designs. Operating temperature range –320°F to 900°F (–196°C to 480°C).
Every platinum element type in wire or thin film, single or dual is available.
21A - Straight probe
21B - Rigid probe with welded double 1/2 NPT hex mount
21C - Hermetically sealed rigid probe with 1/2 NPT hex mount & connector
21D - Spring-loaded probe with universal spring inside any style pipe mount
21H - Hermetically sealed straight probe with transition and cable
Series 218 - Wide Range 1/8” Probes
1/8" diameter probes with faster response time. Operating temperature range –320°F to 900°F (–196°C to 480°C).
Platinum element options with TCR per IEC 60751 and Reference grade.
218A - Straight probe
218T - Straight probe with 1/4” dia. transition to larger gauge leads
Series 22 - Explosion Proof Wide Range RTD Probes
Explosion proof probe assemblies with all platinum element types and hardware styles. Probe sheaths available in stainless steel or Inconel. Operating temperatures ranging –320°F to 1200°F (–196°C to 649°C).
22B - Rigid probe with welded double 1/2 NPT hex mount
22D - Spring-loaded probe with universal spring inside any stainless steel mount
Series 23 - Mid Range 1/4” Spring-loaded RTD Probes
Optimized mid-range probe RTDs with fast response, immersible design. The 1/4" diameter probes feature low-cost spring-loaded mount choices. Operating temperature range –60°F to 500°F (-50°C to 260°C).
23A - Straight Probe (Can be cut or bent)
23B - Rigid Probe with welded double 1/2 NPT hex mount
23D - Spring-loaded probe with universal spring inside any style 1/2” pipe mount
RTD Probe Assemblies with Fail-Safe Pressure Seal
Exclusive seal at mounting withstands 1500 PSI if probe tube is severed. Recommended for pipeline or any applications specifying a back-up seal.
22314 - Rigid probe, welded header inside welded double 1/2 NPT mount
22421 - Spring-loaded probe, welded header above spring in the mount