Industrial RdF 21D-10-S-12.5-A-3 4-A-B Temperature Control Sensor Probe Explosion Proof

Industrial RdF 21D-10-S-12.5-A-3 4-A-B Temperature Control Sensor Probe Explosion Proof is an RdF industrial RTD temperature sensor designed for hazardous environments, featuring a rigid-probe configuration in the 21-series family. The RdF 21-series includes straight and rigid probe options (for example, 21B is a rigid probe with welded double 1/2 NPT hex mount), and RdF’s compact aluminum connection head is FM-approved for explosion-proof service up to 260°C, enhancing ruggedness in harsh locations. For integration with control systems, the probe can be extended with aluminum housings and extensions (EX) and can be paired with a transmitter to provide a 4–20 mA output, as demonstrated in RdF’s ordering guidance for explosion-proof RTD assemblies. The combination of a robust rigid probe and explosion-proof housing makes this sensor well-suited to continuous temperature monitoring in chemical plants, refineries, and other facilities where safe, reliable RTD sensors are required in hazardous areas.