High resolution pressure transducers with an analog voltage output for detecting very small changes in pressure or measuring pressure to a high precision.
Typically a 16 bit digital amplifier is utilised to provide a high resolution output to make the most of the available resolution from analog to digital converters in data acquisition cards and other ADC instrumentation devices.
- DMP331i High Accuracy Pressure Transmitter - High precision pressure transmitter with an accuracy of 0.1%FS BSL NLHR and digitally adjustable pressure ranges from 400mb up to 40 bar gauge & absolute.
What is the resolution of a pressure transducer
How do I determine the resolution of a transducer, since I am looking for a pressure transducer that is granular enough to read one pascal change or better? The measured change in pressure has to be below 0.00004 psi at 20 psi.
Most pressure transducer data sheets don’t speak about the resolution of the output, and it is not something you can work out without requesting it from the manufacturer.
Pressure transducers without signal conditioning such as the millivolt strain gauge output pressure transducers are considered to have infinite resolution theoretically. However because the noise level becomes prominent at high resolution, this normally limits the practical measurement resolution of a sensor. The level of noise will depend on the sensor technology. For example lower output sensitivity thick film or bonded foil strain gauges pressure transducers have low signal to noise ratios compared to higher output sensitivity semiconductor strain gauge pressure transducers, and both are used extensively in the build of pressure transducers.
0.00004 psi of a 20 psi range is 0.0002 % FS resolution, for which you would need around 23 bit resolution output signal conditioning, and that is much greater than anything typically available.
If they have 23 bit or better data acquisition then you could try a millivolt output semiconductor strain gauge technology which normally has very high signal/noise ratio in theory.