Pendulums & Readouts

DIRECT AND INVERTED PENDULUMS

Geozone Geoservices_Geotechnical instrumentation_Direct & inverted pendulumHanging 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

Tank dimensions 415mm diam, 476mm high
Material stainless steel
Damping fluid (mineral oil) SAE 50-90 (not supplied)

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

Tank dimensions 615mm diam, 495mm high
Floating unit allows ±72mm movement in any direction
Groutable anchor diameter 75mm, adjustable from 80mm to 160mm by centralized pins
Material stainless steel
Damping fluid (mineral oil) SAE 10 (not supplied)

PENDULUM WIRE
(Product code 0WRAC200000)

Material stainless steel
Diameter 2mm

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REMOVABLE COORDINOMETER

Geozone Geoservices_Geotechnical instrumentation_Removable coordinometerSisgeo 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)

Measurement area X-axis: 0-150mm (±75mm)
Y-axis: 0-100mm (±50mm)
Gauge resolution 0.01 mm
Accuracy ±0.2 mm
Temp. operating range -20°C +50°C
Material aluminium
Dimensions 400x260x120mm
Weight 3.5 kg
Accessories
0S9RTPLT100 COORDINOMETER SUPPORT PLATE
0S9RTDG1000 REMOVABLE DIGITAL CALIPER

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TEL-310 TELECOORDINOMETER

Geozone Geoservices_Geotechnical instrumentation_Tel-310 TelecoordinometerTEL-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)

Measurement area X-axis: 0-100mm
Y-axis: 0-50mm
Execution time for measurement cycle 90 sec (100x50mm area)
Resolution ±0.01mm
Accuracy
–     Digital output X-axis: ±0.02mm; Y-axis: ±0.03mm
–     Analogic output X-axis: ±0.03mm; Y-axis: ±0.05mm
Repeatability 0.001% FS
Power supply 24/110/220V AC, 50-60Hz selectable by internal switch
Input current 60 VA typical
Communication
–     Local readings RS232
–     Remote monitoring RS422/485, 4-20mA (to ADK-100)
Temp. operating range -20°C +50°C
Humidity (UHR) 100% not condensed
Overall dimension
–     Sensor unit 530x220x140mm
–     Power supply box 230x200x120mm
Weight
– Sensor unit 14.5 kg
– Power supply box 6 kg
Detectable wire minimum 1.5mm diam.
Accessories
0S9TELPLT00 TEL-310 SUPPORT PLATE
0SWTELNET00 TEL-NET SOFTWARE for TEL-310

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