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Compact transmitter measures differential pressure with high accuracy
25th October 2008
The PD33X high precision differential pressure transducer can measure with an accuracy of ±0.15% full scale over a temperature range of -10 to +80°C with the analogue signal output and ±0.1% with the RS485 digital output signal.The small size and low mass of the PD33X differential pressure sensor compared with more conventional process dp cells allows it to be used in applications where there is limited space and no convenient mounting point.
The PD33X high accuracy differential pressure transmitter is best suited for medium differential pressure applications for flow or filter condition monitoring from 0.2 Bar up to 50 Bar differential. The standard maximum static line pressure is 200 Bar but higher static line pressures can be specified up to 600 bar if needed.
It is important to note that due to the small size construction there is no mechanical stops built into the design to prevent unintentional high overload pressures being applied to one side only. If you need high overload protection on one side, the PD39X or DRS differential pressure transmitters would be more appropriate.
The sensing technology used in the PD33X precision differential pressure transmitter is an all stainless steel 316L oil filled semiconductor strain gauge capsule which has a good over-pressure rating in the positive direction of two times. Since the accuracy of this digital differential pressure transmitter is so high it is possible to trade some of this accuracy for higher over-pressure by selecting a higher base pressure range and down-ranging the electronics to the desired pressure scaling.
Inside the electronics housing of this high accuracy dp sensor is a microprocessor with an integrated 16 bit A to D converter. A 0-10 volt amplified voltage output or a 4-20mA current loop output signal can be chosen and each has the RS485 communications interface for configuring the pressure sensor or supplying a digital output signal.
The high accuracy over a wide temperature range is achieved by mapping the differential pressure readings of each transducer over the compensated temperature range during manufacture. The results of the mapping are mathematically modelled to produce polynomial compensation coefficients which are then stored in the differential sensors non-volatile EEPROM memory.
For hazardous area environments the ATEX approved version of PD33X Ei high accuracy dp sensor can be used with an appropriate IS barrier.
Related Products
PD33X high accuracy differential pressure sensor product page
Other high accuracy differential pressure sensors
Differential pressure instrumentation
Associated Topics
Accuracy of pressure sensors explained
Difference between TSL an BSL accuracy
Calibrating with a high accuracy digital pressure sensor
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