Gauge pressure sensor OTT PLS for the precise and reliable measurement of water levels in ground-and surface waters. The PLS features a long-term stable, highly precise, capacitive ceramic pressure cell. This cell is extremely robust and insensitive against mechanical overload as well as against aggressive media. The sensor electronics measure pressure and temperature values. Compensating for temperature effects, water density and the specific gravitational force at the measuring site, the sensor delivers highly precise and repeatable actual water levels. The OTT PLS can be supplied with various outputs for transferring the values to an attached datalogger - the analog 4 ... 20 mA output or the digital SDI-12 or RS-485 outputs. In addition to the waterlevel also the water temperature can be output via the serial interface. Finally, the OTT PLS is supplied with a high quality and particularly tough stainless steel housing and even the cable for the probe is extraordinarily tough due to Kevlar fibers incorporated.
Advantages
Insensitive against mechanical overload or aggressive media
Capacitive ceramic pressure cell for long-term precision
Flexible due to various outputs, 4 … 20mA Signal or serial SDI-12 interface (output of water level and water temperature) and RS-485
Incorporated intelligent controller compensates for temperature and adjusted influencing factors /gravitational force, water density at different temperatures
Probe cable with compensating capillary, Kevlar core, and connection wires
Robust design IP68
Resolution can be increased by allocating the 4 ... 20 mA-signal to an individually downscaled measuring range
Humidity absorber protects the pressure cell from condensate due to variation of the barometric pressure
Examples of use
As the OTT PLS is relatively easy and rapid to install even without a stilling well, it is especially suitable for new measuring sites and for locations where float-operated units aren't applicable for example:
small diameter pipes or holes (from 1')
stations with sloping bottom, e.g. banks
waterways that do not contain water throughout the year (e.g. retaining basins or wadis)
