Resistance Temperature Detector Specifications
ARi ARiDET® consists of a specially installed platinum resistance element completely encased in compacted metallic oxide insulation of high thermoconductivity to insure minimum temperature differential between the sensor surface and the element. Standard sensors have 3 constantan equi-resistance lead wires in the lead portion with compacted MgO insulation. Sheath material is 316 L ST/ST in fully annealed condition. Performance specifications are shown for the element portion and the lead portion.
Typical 3-wire measuring circuit for RTD'S
A 3-wire system may be used to eliminate the effect of lead wire resistance changes by introducing RL (lead wire resistance) into each leg of the bridge. The third lead wire is added to the detector circuit without effecting bridge balance. The resultant circuit is sensitive only to resistance element temperature changes.