dMPBX

YieldPoint’s recognizes that in many mining situation fast deployment of an ungrouted borehole extensometer is preferable. The d-MPBX is a unique 1 to 6-Point Multiple Point Borehole eXtensometer (MPBX) based on a single rod design. The anchors are fitted with stainless steel torsion springs that secure the instrument in a 38-54mm borehole. The d-MPBX incorporates digital signal processing to result in dramatically improved accuracy compared to similar priced existing technology.

 

Design features of the d-MPBX involves a stiff hermetically sealed and potted central core that includes all of the electronics. The anchors are a simple aluminum tube to which are attached torsion springs that secure the anchor against the borehole wall.

 

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 (d-Logger), and wirelessly networked (dMesh) for transmission to cloud based servers. The signals themselves are robust and can be transmitted over 500m of lead-wire. If broken the lead-wire can be twisted and taped together.

 

Specifications:

 

'Robust' design with high strength filament wound fiber glass core

Up to 6 spring loaded anchors

Does not require grouting

150mm (6 inch) stroke length

High individual sensor accuracy (0.3%FS) and resolution (0.01mm)

Output in real world units

Unique instrument ID

Calibration Coeffs. in Flash memory

Smallest electronics head (25mm diameter 150mm long)

On-board digital temperature sensor for accurate compensation

High survivability following blasts and vibration even if toe is damaged

Easy to install and maintain—Arrives on site fully assembled

 

Features:

 

Key Feature: Fully integrated and preassembled borehole extensometer

Dimensions: 25mm diameter can be placed in 33-50mm 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 °C

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.