Differential Pressure Measurement with Even Better Zero-Point Accuracy  

Sensirion’s (Switzerland) digital differential pressure sensors in the SDP600 series have been used successfully in medical equipment and HVAC applications since 2009. The results from practical experience and tests exceed even the ambitious expectations. In particular, the zero-point accuracy specification has been improved significantly and is now stated as a maximum deviation of 0.2 Pa.

The first dynamic digital differential pressure sensor from Sensirion, the SDP600 series, was awaited with great anticipation. This was hardly surprising, since the advance specifications of the small, fully calibrated sensor included outstanding long-term stability and a short response time along with high accuracy and sensitivity, even with very small differential pressures (less than 10 Pa).

Accumulated practical experience with the sensor and test results now show that the performance exceeds the high standard of the advance specifications. In particular, the range of zero-point variation is three times less than expected. The maximum deviation from the zero point was originally specified as 0.5 Pa, but now it has been restated as 0.2 Pa. The SPD600 series also solidly fulfils its expectations with regard to reliability and other specifications. With this, the new sensor achieves the level of more expensive reference products.