ERI Fill Extensometer
CONTINUOUS AND ACCURATE MEASUREMENT
RESISTANT TO SHOCKS AND VIBRATIONS
WIDE MEASURING RANGE
The ERI is a telescopic extensometer used to measure longitudinal displacements and axial deformations over long base lengths.
The fill extensometer Model ERI consists of a telescopic outer PVC pipe fitted with two end flanges and an inner stainless steel rod. One end of the rod is attached to a flange, while the other end of the rod is attached to a displacement sensor, which is attached to the other flange. A signal cable attached to the sensor links the sensor to a readout at the surface. As displacement occurs, the telescoping outer pipe moves with the soil, causing the rod to compress or extend the displacement sensor.
These fill extensometers are generally installed horizontally in trenches, but sometimes vertically in boreholes. The standard lengths of the fill extensometer Model ERI are between 3 meters and 6 meters. Extensometers can be assembled in series using threaded rods inserted in the holes on each.
Specifications
| Range | 25, 100, 150, 200 and 300 mm |
| Sensor type | Vibrating wire |
| Accuracy | ±0.25% F.S. |
| Resolution | 0.02% F.S. (MB-3TL) |
| Cable | IRC-41A(P), IRC-390 |
| Thermistor (optional) | 3kΩ |
| Operating temperature | −20 to +80°C |
| Base length | 3m (longer upon request) |
| Outside diamete | |
| Stainless steel extension rod | 6.35 mm |
| End flange | 150 mm |
| PVC telescoping coupling | 42 mm |
| PVC sensor housing | 48 mm |
| PVC casing | 33 mm |
| Readout unit | MB-3TL |
| Data acquisition system | SENSLOG |
Ordering Info
Please specify:
- Base length and range
- Electrical cable length
Optional accessories:
- 1m rod and tube Readout instruments
- Readout instruments
