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Sensors paired to measure differential pressure with high overload5th May 2008 The PD-39X Differential Pressure Transmitter uses two absolute pressure transducers to measure the pressure on the positive and negative side ports. Digital compensation techniques are then employed to provide two highly accurate pressure readings via the built-in microprocessor. The two high precision pressure sensor measurements are subsequently subtracted by the digital electronics and converted into an analogue differential pressure signal output of 4-20mA or 0-10Vdc. The PD39X digital differential pressure sensor can withstand overpressures on either port of 1.5 to 3.3 times the maximum static line pressure without degrading the performance of the sensor. Since there is no differential sensing diaphragm there is no need for mechanical protection stops to protect the sensor from accidental overpressure on one side. This simpler mechanical design provides a very cost effective alternative to more conventional differential pressure transmitters. The PD39X dp cell comes in 5 standard pressure ranges 3 bar, 10 bar, 25 bar, 100 bar and 300 bar differential. Each range can be digitally turned down to the desired differential range. It is recommended not to exceed a 20 to 1 turn down ratio in order to maintain a practical accuracy tolerance. The accuracy of the PD-39X differential pressure transducer is typically 0.5% FS of the standard range which includes linearity, hysteresis, repeatability and thermal errors over a compensated temperature range of -10 to 80 Deg C. Any trade off in accuracy due to pressure range turndown will result in an improvement of overpressure, so both parameters should be considered in order to achieve the optimal differential pressure performance. The PD-39X rangeable differential pressure transmitter is fully programmable via a RS485 half duplex interface and you can configure the RS485 interface to readout the absolute pressures and temperatures of both sensors simultaneously with the analogue differential pressure output. The RS485 communications also provides the ability to adjust zero & span settings at calibration intervals, set up special scaling for the analogue output, adjustment of the low pass filter damping, sample rate & bus addresses, and readout of product information such as range and serial number. The analogue output can also be configured for flow measurements if you require a square root signal output. Related Products PD39X differential pressure transmitter detailed product information DP sensors and instrumentation Pressure sensors with high over-range capability Absolute pressure transducers and transmitters Associated Topics What to consider when choosing a DP pressure sensor Protecting a pressure sensor from high overpressure Understanding the different types of pressure reference Resources Guide to pressure sensor specifications Differential pressure explained Convert a differential pressure into other engineering units
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