ISPRA Istituto Superiore per la Ricerca e la Protezione Ambientale





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National Tidegauge Network

General information




Anomalus waves

Tidegauge stations

Ondametric stations


Air temp. & rh% transducer

Barometric sensor

Hydrometric staff

Level pressure

Multi parameter probe

Ondametric buoy

Radar level transducer

Ultrasonic sensor wind intensity and direction

Ultrasonic tidegauge

Water level sensor

Water temperature transducer

Stations comparison

RMN Levelling

Data/analysis archive




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 -4060 C: Humidity 10100 %
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