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Pressure measurement


The Grand Canal and the Rialto Bridge in Venice


networked with one another and equipped with intelligent control and monitoring systems. Data from throughout the system is sent to a control centre. Information on weather conditions and sea currents is also analysed and used as a basis for decisions on when to close the flood gates.


KELLER tRansmittERs in thE foundation


Secured by giant hinges set in concrete, the steel gates are 20 metres wide, five metres thick and up to 30 metres high. When there is a danger of flooding, air is pumped into the gates, which causes them to rise up to form a protective barrier against the Adriatic Sea and block off the lagoon like a floodwall. When the water is at a normal level, the gates lie retracted beneath it. Extremely precise data is needed to control


and monitor the gates. In order to monitor the structure of the caissons, geotechnical specialists at Agisco s.r.l. therefore installed


digital (bus) profilometers in the concrete elements. The profilometers work with highly accurate KELLER X series transmitters with IP-68 protection. This solution guarantees impressively high precision – down to one- tenth of a millimetre over a length of several kilometres.


high-pREcision pREssuRE tRansmittERs thE X sERiEs


The pressure transmitter’s extremely high accuracy of 0.01%FS is available as an option; the standard precision of the X series (33X, 35X and 36X) is 0.05%FS. This high degree of measurement precision is achieved by combining a stable, floating, built-in piezoresistive transducer with an XEMICS microprocessor with an integrated 16-bit A/D conver ter. The latter uses mathematical com- pensation to eliminate the temperature dependencies and non-linearity of the sensor. The transducer registers even the tiniest pressure fluctuations. In order to ensure that


Caissons made of reinforced


concrete form the foundation of the flood protection system


this high sensitivity is effectively exploited, the measuring element must be well shielded from disruptive external influences. For example, the floating installation setup com- pletely decouples the transducer from mechanical tension in the outer housing.


Keller www.keller-druck.com


M.O.S.E gate system Instrumentation Monthly May 2019 37

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