The Keller PD39X series differential pressure transducer is designed to indirectly measure differential pressure by using two absolute pressure sensors providing a more robust sensor in relation to unbalanced pressures that transducers using a single sensor. Differential pressure ranges between 0-3 and 0-300 bar are available with output signal options of 4-20mA and 0-10V. These units also have an RS485 output in addition to the standard analogue outputs. Typical error band ≤0,05 %FS typ. (linearity, hysteresis, repeatability and temperature effect
Piezoresistive Differential Pressure Transmitters based on two Absolute Sensors
In applications where the differential pressure is more than 5% of the maximum standard pressure range, differential pressure measurement with two absolute pressure sensors offers major advantages over conventional methods of differential pressure measurement (such as the Series PD-10).
The Series PD-39 X does not measure the differential pressure directly – instead, it uses two absolute pressure sensors to take the measurement indirectly. As well as reducing costs, this differential pressure transmitter is also more robust in relation to unbalanced (one-sided) overloading. The differential pressure range should be at least 5% of the standard pressure range. Each pressure side has two pressure connections, so the PD-39 X is easy to use in pressure lines.
| Specification | |
| Standard Pressure Ranges | see data sheet |
| Output | 4…20 mA (2-Wire) 0…10 V (3-Wire) |
| Error Band | typ. < 0,05 %FS, max. < 0,1 %FS |
| Long Term Stability typ. | 0,1 % |
| Storage-/Operating Temperature Range | -40…100°C |
| Compensated Temperature Range | -10…80°C |
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