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MPBX - Multipoint Borehole Extensometers

InfrastructureGeotechnical Instrumentation

The MPBX, also known as multi-point rod extensometer, is designed to monitor changes in the distance between downhole anchors, each set at a specified depth in the borehole, and a measurement head at the surface. Rods extend upward from the anchors to the head, where measurements are made with a depth micrometer or displacement transducers. MPBX heads are sized to accommodate measurement ranges up to 100 mm (3.9”) or 200 mm (7.9”), the number of anchors (points) to be monitored, and the type of rod to be used. More info.↗

Quantity

Measurement principle	vibrating wire with built-in thermistor	Linear potentiometer
Range	10, 25, 50, 100, 150mm	25, 50, 100, 150, 200mm
Accuracy Pol. MPE	< ±0.50% FS (10mm) < ±0.50% FS (25mm) < ±0.30% FS (50mm) < ±0.30% FS (100mm) < ±0.30% FS (150mm)	< ±0.30% FS (25mm) < ±0.30% FS (50mm) < ±0.30% FS (100mm) < ±0.15% FS (150mm) < ±0.15% FS (200mm)
Output signal	frequency (displacement), Ohm (thermistor)	4-20 mA current loop (displacement)
Resolution	<0.0066% FS	<0.0060% FS
Typical frequency range	1500 - 2800 Hz
Power supply		12 - 24 V DC
Operating temperature	- 20°C +80°C	- 20°C +80°C
Material	stainless steel	stainless steel
Thermal coefficient of expansion	50 ppm / °C	50 ppm / °C

Downloads

MPBX	DownloadMPBX

MPBX - Multipoint Borehole Extensometers

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