The pressure measurement of the PTB330 is based on the Vaisala in-house, silicon capacitive, absolute pressure sensor - the Vaisala BAROCAP Sensor. It provides high measurement accuracy and excellent long-term stability. Fine-tuned and calibrated all the PTB330 barometers come with a NIST traceable, factory calibration certificate.
The PTB330 can incorporate one, two or three BAROCAP sensors according to requirements. When two or three sensors are used, the barometer continuously compares the readings of the pressure sensors against one another and provides information on whether these are within the set internal difference criteria. This unique feature provides redundancy in pressure measurement. Thus, users also get a stable and reliable pressure reading at all times as well as a pre-indication of when to service or recalibrate the barometer.