When pressure sensors are used for depth readings of any fluid, the density becomes an important parameter. In
Australia a standard describes the relationship between force and water depth:
Australian Standard AS1376-1996 *
1kPa = 102.15 mm of pure water. @20degC
There is typically a 3% difference in the density between pure water and seawater. This difference should be
considered when particular measurement accuracy’s are required.
Another factor affecting calibration accuracy is gravity. The departure from standard gravity in Warwick, Qld is –
0.17%. at latitude 27.973 deg, height 458m above sea level.
The PS7000 has a feature to adjust the fluid density and gravity to suit specific applications.
*For conditions, see Clause 1.3.8.3 Australian Standard AS1376
Applications in which the Greenspan PS7000 can be used include:
Monitoring of streams and rivers.
Monitoring of water storage bodies including stratification studies.
Hydrological run off studies.
Ground and bore water analysis.
Industrial process monitoring.
The Greenspan PS7000 consists of the following primary elements:
Ceramic capacitance transducer with Acetal protective nose cone
22.5mm outer diameter
Stainless steel body material
Moulded cable entry
Power and
Data Cable
Moulded Cable Entry
22.5mm OD 316SS Body
Double O Ring connections
Ceramic capacitance
transducer Acetal
protective nose cone
