What Is an Angle Meter?
Angle meters are devices used to measure the angle of inclination. There are two types: the pendulum type, which uses a pendulum to estimate position, and the float type, which measures the amount of change in the electrostatic capacity of a float inside a container filled with fluid and gas. Angle meters are not suitable for use in environments subject to frequent vibration, as many products do not support changes in acceleration. When mounted on automobiles or other vehicles that experience acceleration, a gyro sensor should be used to ensure levelness.
Uses of Angle Meters
Angle meters are used in buildings, large facilities, and construction sites where work at heights is required. By measuring the level of the ground, they are used in determining the dimensions of building foundations and ensuring the level when installing the foundations of cranes and other vehicles that work at heights to prevent them from tipping over. When selecting an angle meter, it is necessary to consider the method of measuring inclination, accuracy, given time for measurement, operating environment such as temperature, and connectivity with other equipment.
Principle of Angle Meter
The measurement principle of angle meters is explained separately for the pendulum type and the float type. Angle meters consist of components that measure the horizontal, as well as connection terminals for outputting the measured value, a display unit, and a control panel.
1. Pendulum Type
The pendulum type consists of a pendulum with a magnet attached, a magnetic sensor to detect changes in magnetic force, and oil to suppress minute vibrations. During measurement, the pendulum is swinging toward the center of the earth due to gravity, and the value of the magnetic force, which changes according to the distance between the center of the oscillation and the position of the magnetic sensor, measures the degree of inclination of the angle meter’s installation site.
2. Float Type
The float type consists of a circular container with gas and liquid sealed inside it in the same volume, with two plates that serve as electrodes. During measurement, the liquid surface is inclined according to the inclination angle, and the inclination causes the capacitance of the plates to change, and the inclination angle is measured by measuring the amount of change. Care should be taken when measuring at very high temperatures, as the liquid may vaporize and accurate measurements may not be possible.