Pendulums & Readouts

DIRECT AND INVERTED PENDULUMS

Hanging pendulums are designed to monitor horizontal movements. They are commonly used in concrete dams to measure change of verticality of the structure. The direct pendulum is a gravity-referenced instrument. It consists of a steel wire anchored at a fixed point and a damping tank containing damping fluid. The inverted pendulum provides a fixed datum from which structural movements can be measured. It utilizes the identical wire anchored in borehole beneath the structure, with a floating unit fixed to its upper end. The floating unit is free to move in a fluid tank, keeping the wire vertically suspended. Pendulums are often installed in shafts in the concrete of the dam starting with an inverted pendulum anchored in foundation to obtain a complete profile of the change in verticality of the dam.

Technical Specifications
DIRECT PENDULUM
(Product code 0S911002500)
Direct pendulum assembly includes:
- stainless steel cylindrical fluid tank with cover
- wire tensioning weight and damping unit
- upper wire anchor system with rail and sliding block
- turnbuckle for trimming the damping unit position

INVERTED PENDULUM
(Product code 0S912006000)
Inverted pendulum assembly includes:
-     stainless steel anular damping chamber with cover
-     stainless steel floating unit
-     adjustable tie bar with 100mm vertical stroke
-     external tube for liquid level survey
- steel ballast for borehole wire anchoring

PENDULUM WIRE
(Product code 0WRAC200000)

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REMOVABLE COORDINOMETER

Sisgeo pendulum optical readout (coordinometer) is a reliable and simple equipment for manual readings of direct and inverted pendulums. The coordinates of the pendulum steel wire are measured by means of two pairs of photocells mounted on a high-accuracy sliding unit. It permits to calculate the horizontal movements of the wire both in the upstream-downstream directions and left bank-.right bank directions. It can be used either for in-place installation or removed for measurements in different locations. Pendulum reading locations are equipped with support plates. The plates mount calibrated ball supports for accurate and repeatable positioning of the pendulum optical readout.

Technical Specifications
PENDULUM OPTICAL READOUT
(OPTICAL COORDINOMETER)
(Product code 0S9RTB15000)

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TEL-310 TELECOORDINOMETER

TEL-310 Sisgeo Telependulum is an optical device designed for automatic measurements of the coordinates of the pendulum plumb lines. TEL-310 permits high accuracy continuous monitoring. It consists of two separate units:
- sensor optical unit “non-contact type” equipped with stepper motor assembly and electronic mother board;
- power supply box which also includes RS232 port for local communication and the wiring board for long distance data transmission and network applications. TEL-310 is also supplied with its own protective cover, the support device for accurate positioning and the calibration checking frame.

Technical Specifications
TELEPENDULUM TEL-310
(TELE-COORDINOMETER)
(Product code 0S9TEL31000)

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