Because pressure transducers consist of different materials, extreme temperature fluctuations may influence the transducer’s output signal even though pressure remains constant. The rate of expansion or contraction of these different materials creates stresses within the transducer which may change the transducer’s mechanical properties or electrical characteristics. Taber transducers are designed to minimize this influence and are compensated by electrically adjusting the transducer’s output circuit.
High-level transducers (0-5Vdc isolated output) have a range of -65°F to +250°F for both the maximum CTR and OTR. This limitation is due to the active electronics, which cannot be subjected to temperatures beyond those ranges. The Taber 0-5Vdc non-isolated and the 4-20mA circuit has a maximum CTR and OTR which is -40°F to +250°F. The standard Compensated Temperature Range for these transducers is -30°F to +170°F.
There are several solutions to utilize a bonded-foil pressure transducer beyond its temperature limitations:
IMPORTANT: Thermal errors are typically accounted for and specified separately from other errors that can affect transducer accuracy (e.g. linearity, repeatability, and hysteresis).