MULTIPLE ROD EXTENSOMETER – dExto

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.