Digital Differential Pressure Sensor

High precision differential pressure transducer with an accuracy of 0.1% full scale including temperature errors over +10 to 40 deg C. Available in pressure ranges from 1 to 30 bar differential with a RS485 digital interface as standard plus an optional USB, Bluetooth or RS232 converter cable...

Product Details

High precision differential pressure transducer with an accuracy of 0.1% full scale including temperature errors over +10 to 40 deg C.  Available in pressure ranges from 1 to 30 bar differential with a RS485 digital interface as standard plus an optional USB, Bluetooth or RS232 converter cable for connecting to a desktop or laptop computer.



Product Parameters

Product Description

The PD33X differential digital pressure sensor incorporates semiconductor strain gauge sensing technology and digital compensation techniques to produce a highly precise pressure transducer over a wide temperature range.

The optional USB, Bluetooth or RS232 interface cable enables the PD33X digital differential pressure transducer to be used with the prog30 instrument configuration software and the read30 data reading software. The live pressure output signal can be read or a data logging procedure can be configured for recording pressure data at timed intervals. All data can be displayed in the form of graphs and printed out if necessary.

The PD33X differential digital pressure sensor also incorporates a temperature sensor which is located very close to the diaphragm in contact with the media. This temperature sensor is used to digitally correct the pressure transducer at different temperatures and it is also provided as an output signal via the RS485 interface.

Product Applications

Water system pre-filter

Measure the difference in pressure between pre-filter inlet and outlet for a water system.

Measuring line pressure and differential pressure

Is it possible to readout the line pressure from the PD33x digital dp sensor?

You cannot read line pressure with the PD33X but you can read the pressure from each pressure port with the PD39X digital dp sensor.  The PD39X has two absolute sensors inside, one for the positive and one for the negative side.  The line pressure can be monitored on both sides and the differential pressure is determined by subtracting the two readings.  However measurement of the line pressure is only possible with the digital interface.
Twin sensor and digi comp board pd39x

1 bar range accuracy & cal points

I am interested in a PD-33X/0-1bar/4-20mA+RS485, but I need a certificate of calibration of each one, and the maximum error of the pressure measurement must be less than 0.1% F.S., the points of calibration must include 0, 468, 537, 738 mbar?

The accuracy is 0.1% full scale for the RS485 and 0.15% full scale for the 4-20mA including thermal errors over -10 to +80°C.

If you will be operating over a narrower temperature range then the PD33X specification is 0.05% full scale for RS485 and 0.1% full scale for 4-20mA over 10 to 40 degC.

The standard calibration report shows performance at 6 points over 0 to 1 bar range, 0, 200, 400, 600, 800, 1000 mbar, and this is repeated at 4 different temperatures -10, 25, 50 and 80°C for a -10 to +80°C compensated range.

High resolution measurement of pressure drop along a pipe

I need to make a high resolution measurement of the pressure drop in a pipe that could have a pressure in the range of between 30 and 150 bar. I need to measure the variation for example from 40.999 to 50.000 psi.  Can you suggest any equipment able to measure in these conditions. If not what would be the minimum significant figure that could be achieved?

The best measurement resolution achievable with the PD33X is 0.002% full scale via the RS485 output which can be converted to USB, Bluetooth or RS232.

The PD33X has a 16 bit ADC, which will provide a resolution of approximately 20 ppm.  The resolution of the following standard ranges is:


The specification required is:



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