MULTIPLE ROD EXTENSOMETER – dExto
YieldPoint’s unique 1 to 6-Point Multiple Rod Extensometer (d-Exto) combines a traditional Multi-Rod design ( robust torsionally straightened stainless steel) and digital signal processing to result in dramatically improved accuracy and reliability compared to similarly priced existing technology. This highly accurate digital instrument comprises up to six (6) Linear Variable Induction Transducers (LVITs) and an on-board digital temperature sensor.
Design features of the d-Exto include a tough fiber glass tube, an internal rubber spacer to ensure that central core which will not be damaged by shear movements of up to 10mm all inside a strong and durable than polyethylene sheath. The hermetically sealed (double potted on request) electronics operate indefinitely when submerged in water.
The inherently digital nature of the signals eliminates the necessity for expensive analog-to-digital conversion and results in low cost readout unit that reads data directly in real world units (mm and °C). The sensor output is an ASCII (9600,8,N,1) digital signal which can be read by a low cost readout unit (d-Reader), dataloggers (BluLink and BluLoggers), and backhauled using (i) Ethernet/Wifi, (ii) LTE-M cellular or (iii) 900MHz(ISM) d-Mesh for transmission to cloud based storage and visualization (VantagePoint).
SPECIFICATIONS:
- Key Feature: Fully integrated and preassembled borehole extensometer
- Dimensions: 25mm diameter can be placed in 50mm hole.
- Dimensions: Up to 6 Anchor points over lengths up to 30m
- Disp. Range: 125, 150 (standard), 200 and 250mm.
- Disp. Accuracy: typically 0.5% F.S(<10m) and 1% linearity (>10m). Depends on distance between anchor point and head.
- Temp. range: -40 to 125 oC
- Output Signal: RS485 with transmission up to 500m over 2 x tp.
- Output Signal: Asynchronous serial signal – 9600,8,N,1. ASCII encoded. Values and units transmitted.
| Brands | Yieldpoint |
|---|---|
| Anchor points | 1 ~ 6 |
| Range | 150-250mm |
| Resolution | 0.01 mm |
| Overall Accuracy | 0.35%FS or 0.5mm |
| Temp. range | -40 to 125 °C |
| Temp Resolution | 0.1°C |
| Output in real world units | mm |
| Output | RS485 |
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