SISGEO

Hydraulic Pressure Cells

InfrastructureGeotechnical Instrumentation

The hydraulic pressure cells are designed to measure stresses in shotcrete tunnel linings, contact pressures on structures, and stresses in rock walls. The cell consists of two steel plates welded at the edges to form a cavity, which is then filled under vacuum with de-aired oil. A length of high-pressure tubing connects the cavity of the cell to the pressure pad to the pressure transducer. To accommodate shrinkage of the concrete after curing, a repressuring device can be used to expand the cells and restore good contact. More info.↗

Quantity

Specification

Model	PK45H MODEL	P252A MODEL
Model description	VW pressure transducer	piezo-resistive pressure transducer
Full scales (FS)	0-350 kPa up to 0-20.0 MPa 0-50 psi up to 0-2900 psi	0-200 kPa up to 0-20.0 MPa 0-29 psi up to 0-2900 psi
Sensitivity	0.03% FS	0.002% FS
Total accuracy	< ±0.25% FS < ±0.1% FS on request	< ±0.20% FS (for 200kPa FS) < ±0.15% FS (all other FS)
Typical frequency range	2250 - 3000 Hz
Output signal	frequency	4-20 mA current loop
Electrical supply		12-24 VDC
Operating temperature range	-20°C +80°C	-20°C +80°C
Transducer Material	stainless steel	stainless steel