sensors

Normal Plumbline System

Precise verticality monitoring system for measuring relative horizontal displacement in dams and tall structures.

Range (Manual)
±50 mm or ±100 mm
Range (Automated)
50 x 50 mm / 100 x 100 mm
Accuracy
±0.05 mm

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Overview

Precise verticality monitoring system for measuring relative horizontal displacement in dams and tall structures.

The Geolook Normal Plumbline System is a high-precision instrument designed to monitor the horizontal displacement of large structures such as concrete dams, skyscrapers, and nuclear cooling towers relative to their vertical axis. The system relies on gravity to establish a true vertical reference line. A heavy weight (plumb bob) is suspended by a steel wire from a fixed point at the top of the structure. The position of the wire is measured at various elevations using a contactless Telecoordinometer (RX-TX) or a manual optical coordinometer. This provides a direct, drift-free measurement of how much the top of the structure has moved relative to the monitoring station.

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Benefits & Features

  • Absolute vertical reference established by gravity
  • Extremely high accuracy (±0.05 mm)
  • Contactless measurement options (Telecoordinometer)
  • Long-term stability with zero drift
  • Stainless steel signal wire
  • Fluid-damped tank to reduce wire oscillation
  • Simple, robust mechanical design

Detailed Description

Normal vs. Inverted Plumblines

It is crucial to select the correct orientation for your project:

  • Normal Plumbline (G76-M970): Fixed at the TOP, weight at the BOTTOM. Measures movement of the top relative to the bottom station. Used when the monitoring gallery is accessible at the base.
  • Inverted Plumbline: Fixed at the BOTTOM (in bedrock), float at the TOP. Measures absolute movement of the structure relative to the stable foundation rock.

Damping System

To prevent the wire from acting like a pendulum due to wind or structural vibrations, the plumb bob is suspended in a tank filled with high-viscosity oil.

This damping ensures the wire remains steady, allowing for high-precision static measurements even in active construction environments.

Readout Methods

The position of the wire can be read in two ways:

  • Manual: An operator uses a sliding Optical Coordinometer with a micrometer gauge to visually align crosshairs with the wire.
  • Automated (Telecoordinometer): A contactless optical sensor (CCD or Inductive) continuously tracks the wire's X-Y position and sends data to a central logger.

Available Models

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Specifications

Range (Manual)
±50 mm or ±100 mm
Range (Automated)
50 x 50 mm / 100 x 100 mm
Accuracy
±0.05 mm
Wire Type
Stainless Steel / Invar
Plumb Bob Weight
10kg - 60kg (Height dependent)
Damping Fluid
High-viscosity Oil
Operating Temp
-20°C to +80°C