DETECTOR-3EX

Reduces deployment costs by 50 to 75 %
High accuracy (0.5% FS) +resolution (0.01% FS) using DETECT technology
Single rod design enhances accuracy and reduces manufacturing costs
Inherently digital
Microcontroller provides output in real world units
Microcontroller stores sensor ID & Calibration Coeffs. in FLASH memory
Smallest electronics head (25mm diameter 150mm long)
On-board digital temperature sensor for accurate compensation
Non contact technology provides immunity to hostile environment
High survivability following blasts and vibration
Easy to install and maintain. Arrives on site fully assembled

Low cost readout unit for output in mm and ^oC

Guaranteed lowest cost in class

YieldPoint’s 3-Point Extensometer (DETECTOR – Digital Extensometer Technology using Eddy Current Transducer – Optionally Retrievable) is a major breakthrough in ground monitoring technology for mining. Unlike civil engineering where a location may require monitoring for many years, for mining the critical locations change frequently as mining progresses. In many cases extensometers provide useful information for only a few weeks or months.

The DETECTOR-3EX involves grouting a low cost disposable plastic tube with conductive aluminum anchors/targets into a borehole. The electronics probe extensometer is then inserted into the tube to monitor relative displacement of the aluminum targets. During monitoring the response is identical to a permanently installed extensometer (eg.DETECT-3EX). Following the monitoring period the retrievable electronics can be recovered  from the borehole and installed elsewhere. The single rod design means that displacement measurements are made at the point of ground movement, and do not depend on translation of a mechanical rod between the point of ground movement and the linear displacement sensor.

The inherently digital nature of the signals eliminates the necessity for expensive analog-to-digital conversion. The sensor output is a 1-wire frequency modulated (CMOS  and TTL compatible) digital signal which can be read by a low cost electronic meter or tachometer, and can  be routinely interfaced with digital channels on PLCs. The output frequency is directly related to real world units (mm and ^oC) so that meaningful results can be obtained by even unskilled personnel.  The signals themselves are robust (0-5V square waves) can be transmitted over 1000ft of lead-wire, and if broken the lead-wire can be twisted and taped together. Frequency modulation is widely recognized as preferable for the harsh mining environment where amplitude signals are prone to inaccuracies.

As a result both the resolution (<0.01mm)  and  accuracy  (<0.50% )  are an order of magnitude better than for similarly priced alternatives. An on-board digital temperature sensor provides accurate compensation (T_c=0.01%FS/^oC over 0-50^oC).

Since  DETECT technology involves non-contact sensing the design is inherently waterproof; therefore it is especially suited for monitoring the displacement of backfill or pastefill. The DETECTOR-3EX  is suitable for embedment in  concrete structures.

Click here to download product sheet as an Abobe Acrobat PDF file.

Click here to download Borehole Extensometer Interpretation Note as an Abobe Acrobat PDF file.

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