Piezoresistive level probe PIEZO ST

for waternatural water2-wire

Description
The PIEZO ST piezometric probe provides continuous water level monitoring in wells, rivers, lakes and groundwater. The hydrostatic probe is also used for pump automation via a control relay.
The probe features a piezoresistive measuring cell that detects hydrostatic pressure proportional to water depth. Pressure data are converted into an electrical signal and conditioned into a 4-20 mA loop.

Operating principle
The probe is submerged at the bottom of a borehole, well or tank. The piezoresistive sensor measures the pressure exerted by the water column above the probe; this signal is converted into an electrical output proportional to water height and transmitted to a control unit, data logger or PLC.

Typical applications

• Monitoring of groundwater, wells, rivers and lakes
• Water resource management and agriculture
• Environmental engineering and construction works
• Pump automation and control (via control relay)

Recommended accessories

• FIX-CAB (cable clamp for fixation and height adjustment)
• Junction box for signal cable extension
• Surge protector for overvoltage protection

Technical characteristics / specifications

• Full-scale water column: adjustable from 1 mH2O to 500 m (full scale at 20 mA, factory-set to requested value)
• Output signal: 4-20 mA current loop (4 mA = 0 m ; 20 mA = full scale)
• Electrical supply: DC supply 6 to 38 V
• Consumption: signal value (mA)
• Measuring cell: Hastelloy C276
• Hysteresis: 0.05%
• Operating temperature: 0 °C to 40 °C
• Housing material: Stainless steel AISI 316L
• Cable: 2 conductors 0.22 mm², standard 10 m PU cable
• Probe weight: 370 g
• Dimensions: height 130 mm - diameter 25 mm