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DEX in-place extensometers

Dex extensometers are used in conjunction with flush-coupled ABS  inclinometer casings for automatic monitoring of settlement or heave. Strings of DEX extensometer are joined together with stainless steel wire or bars. DEX probes can be placed at different depths were the settlement occurs with reference points at the top or bottom of the casing. DEX-S model is also equipped with biaxial tilt sensors; it permits 3-D borehole profile monitoring. ADK-100 datalogger equipped with GSM module provides automatic monitoring of unattended locations.

Technical specifications

0DEX35010000    Range 100 mm, base 1000 mm
0DEX35050000    Range 500 mm, base 1000 mm
Sensor resolution    0.01mm
System accuracy    0.25% FS
Repeatability     0.02mm
Signal output    0-10V DC
Operating temperature    -20C +60C
Environmental    IP68 (up to 1.5 MPa)
Outer diameter    35mm

DEX-S probe with biaxial tilt sensor    
0DEX35S102B0    Tilt range ±100
0DEX35S202B0    Tilt range ±200
Extensometer range    100 mm
Measuring base     1000 mm
Probe length    1170 mm

Tilt sensor    
Type  Biaxial solid state accelerometer
Resolution  0.01% FS
Thermal sensitivity  ±0.01% FS/0C
Total accuracy  ˂0.4% FS.

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