RTD & PT100 Sensors

Choosing the Wiring Configuration and Resistance Value

The choice between a pt100 sensor and a pt1000 sensor depends on your instrument input and lead wire length. A 3-wire configuration helps compensate for lead wire resistance over longer distances, which prevents measurement drift. For standard industrial controllers and PLC inputs, the 100-ohm platinum resistance probe is the industry baseline.

• 3-Wire Systems: Best for cancelling out lead wire resistance in long runs up to 5 meters or more.
• PT100 vs PT1000: PT100 is standard for industrial PLCs, while PT1000 offers higher resistance changes per degree, often preferred for battery-powered or high-impedance devices.

Selecting Mounting Threads and Probe Dimensions

Mechanical fit ensures proper heat transfer and pressure sealing. We stock probes with standard threaded heads, including 1/2 inch NPT, M6, M8, and copper M3/M4 screws. For deep wells or thick insulation, choose a stainless steel sheath with up to 420mm in probe length.

• Threaded Connections: NPT options from 1/8 to 3/4 inch for process piping, or metric bolts for machinery blocks.
• Surface Mounting: Pasted surface end sensors for quick attachment directly to flat or curved metal faces.

Cable Insulation and Temperature Limits

Matching the cable material to your environment prevents early sensor failure. Silicone cables offer excellent flexibility and moisture protection for moderate temperatures. Metal braided cables protect against physical abrasion in machinery, while PTFE cables withstand chemical exposure and moderate heat.

• Silicone Insulation: Rated for wet environments and temperatures up to 260 degrees Celsius.
• Metal Braid Shielding: Excellent mechanical protection in high-wear areas near moving parts.