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SURVEYDurham Geo
2175 West Park Court |
The vented pressure transducer is designed for low pressures and has a range
of 0 to 1.5 bar (22 psi). The large diameter vent tube provides quick response
to changes in atmospheric pressure and cannot be blocked by condensation.
The large capacity, low maintenance desiccant chamber (optional) keeps vent
tube dry for 3 to 6 months.
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Monitoring
water level in wells and standpipes, and stilling basins
installed in reservoirs and streams.
The
VW pressure transducer converts water pressure to a frequency signal via a
patented arrangement of diaphragm, a tensioned steel wire, and an electromagnetic
coil. The pressure transducer is designed so that a change in pressure on
the diaphragm causes a change in tension of the wire. An electromagnetic coil
is used to excite the wire, which then vibrates at its natural frequency.
The vibration of the wire in the proximity of the coil generates a frequency
signal that is transmitted to the readout device. The readout or data logger
stores the reading in Hz. Calibration factors are then applied to the reading
to arrive at a pressure in engineering units. 
