Chapter 412

Signal conditioning for platinum temperature transducers

Jim Williams

Abstract

Methods for signal conditioning platinum resistance temperature detectors (RTDs) are described.

Keywords

Platinum temperature transducer

resistance temperature detector

RTD

signal conditioning

High accuracy, stability, and wide operating range make platinum RTDs (resistance temperature detectors) popular temperature transducers. Signal conditioning these devices requires care to utilize their desirable characteristics. Figure 412.1’s bridge-based circuit is highly accurate and features a ground referred RTD. The ground connection is often desirable for noise rejection. The bridge’s RTD leg is driven by a current source while the opposing bridge ...

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