| OPERATION | |||
Total pressure acting on the sensitive surface of the cell is transmitted to the oil inside the cell and measured by a VW pressure transducer. A vibrating wire readout or data logger excites the transducer and stores a reading in Hz. Calibration factors are applied to the reading to arrive at a pressure in bar or psi. | |||
| SHOCRETE INSTALLATION | |||
Radial cells are placed at the interface between the excavated ground surface and the shotcrete lining. Tangential cells are attached to the reinforcing cage or to some other support so they will be embedded in the shotcrete lining. After the cells are tied into place, shotcreting takes place. After the shotcrete cures, tangential cells are pressurized by crimping the cell’s pressurization tube, which forces oil from the tube into the cell. The influx of oil causes the cell to inflate, forcing the sensitive side of the cell into contact with the surrounding shotcrete material. | |||
| PRECAST INSTALLATION | |||
| Cells can be cast directly into lining segments at the casting yard. | |||
| ADVANTAGES | |||
| Superior Construction | |||
Cells are made from two oval stainless steel plates. The edges of the sensitive top plate are turned over the base plate and laser welded to form a sealed cavity, which is later filled with deaired oil. This construction minimizes tangential stiffness and prevents stiff weld joints and sharp edges. | |||
Small Height to Width Ratio | |||
The small height to width ratio of the cell provides superior performance, even in stiff media such as concrete. | |||
VW Sensor | |||
The VW pressure sensor eliminates hydraulic lines and provides consistent readings in harsh environments. | |||
Manual or Automatic Readout | |||
The VW transducer can be read manually with a vibrating wire readout or automatically with a data logger. | |||
| SPECIFICATIONS | |||
| Tangential cell | |||
| Sensor Type | Vibrating wire | ||
| Sensor Range | 200 bar. Lower pressure ranges are also available | ||
| Sensor Resolution | 0.025% FS | ||
| Sensor Accuracy | ±0.5% FS | ||
| Size | 222 x 101 x 3.5 mm (8.75 x 4 x 0.14 in.) | ||
| Pressurization Tube | 400mm (16 in.) long | ||
| Radial Cell | |||
| Sensor Type | Vibrating wire | ||
| Sensor Resolution | 0.025% FS | ||
| Sensor Accuracy | ±0.5% FS | ||
| Size | 283 x 151 x 3.5mm (11 x 6 x 0.14 in.) | ||
| CAT. NO. | DESCRIPTION |
| Tangential Cell | |
| SI52608270 | Tangential Cell, 200 bar (3000 psi) |
| SI50613524 | Signal cable |
| Radial Cell | |
| SI52608260 | Radial cell, 3.5 bar (50 psi) |
| SI52608262 | Radial cell, 7 bar (100 psi) |
| SI52608264 | Radial cell, 17 bar (250 psi) |
| SI52608266 | Radial cell, 35 bar (500 psi) |
| SI52608268 | Radial cell, 70 bar (1000 psi) |
| SI50613524 | Signal cable |
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