BAROMETRIC SENSOR - SIAP+MICROS PA9880

The digital barometer is the VAISALA model PTB220B.
The sensing element of PA9880 pressure sensors is a symmetrical silicon capsule that deforms depending on the atmospheric pressure. The transducer is characterised by a very low thermal expansion coefficient and a negligible mechanical hysteresis: both the above characteristics allow high performances mainly in terms of long time stability.
Two gold electrodes are soldered onto the internal surfaces of the capsule in order to create a variable capacitor. An atmospheric pressure increase induces an approach of the electrodes that causes an increase in the capacitance value. The capacitance value is then converted into a voltage by an integrated circuit included in the sensor.
The sensor includes also a digital circuit whose function is to linearize the transducer response and to compensate the pressure data in all the operating temperature range.

Technical data

Transducer: Silicon Capacitor
MeasurementRange: 500 ÷ 1100 hPa
OverallAccuracy: (± 0.3 hPa maximum)
Resolution: + 0.1 hPa
Linearity: ± 0.05 hPa
Hysteresis: ± 0.01% FS
ResponseTime(transducer): < 10 ms
AcquisitionInterval: Programmable
AvailableData: instantaneous
Output: serial RS232/TTL
Operatingconditions: Temperature -40÷60 °C: Humidity 10¸100 %
Dimensions: 145x1138x65 mm
Weight: 0,95 Kg

This sensor is installed into these stations:

Ancona, Anzio, Bari, Cagliari, Carloforte, Catania, Civitavecchia, Crotone, Gaeta, Genova, Ginostra, Imperia, La Spezia, Lampedusa, Livorno, Marina Di Campo, Messina, Napoli, Ortona, Otranto, Palermo, Palinuro, Ponza, Porto Empedocle, Porto Torres, Ravenna, Reggio Calabria, Salerno, San Benedetto Del Tronto, Sciacca, Strombolicchio, Taranto, Tremiti, Trieste, Venezia, Vieste