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COMPENDIUM INCLINATION MEASUREMENT
WYLER AG, WINTERTHUR / SWITZERLAND

7.3 LONG-TERM MEASUREMENTS / MONITORING WITH ZEROMATIC

Inclination measuring devices and sensors
operate according to Newton‘s law of gravitation
(gravitational acceleration). Thanks to this law, it
is possible to identify the absolute zero with a so-
called reversal measurement.
Thanks to this reversal measurement, that is
due to the calculated zero offset, the sensor can
be calibrated. Based on this finding, the so-called
automatic reversal probe ZEROMATIC was deve-
loped. The determined zero offset is considered
for the following measurements.
The biggest challenge in the development pha-
se was the mechanics necessary with regard to repetition accuracy and reliability. The heart of the instru-
ment consists of two digital inclination sensors that constantly output an inclination in X and Y axes.
The limit of error of the entire system with a measurement range of ±1 degree is less than ± 1 Arcsec
for several months. The new inclinometer has sucessfully passed an extensive series of tests in varying
conditions.
The ZEROMATIC 2/1 and 2/2 instruments are ideal for long-term monitoring of objects such as buildings,
bridges, dams, and so on. The principle is based on the just-described reversal measurement to determine
the zero offset. The timing and frequency of such a reversal measurement can be defined by the user.

The difference between the two instruments are as follows:
• ZEROMATIC 2/1 is equipped with one inclination sensor. Every rever-
sal measurement results in a set of values in the X and Y direction.
• ZEROMATIC 2/2 is equipped with two inclination sensors. This allows
continuously receive values in the X and Y direction. After a pre-set
time, an automatic reversal measurement is done in order to compen-
sate a possible zero point offset.

SUMMARY
Measurements for which the position of the object is essential must be taken in absolute mode. Abso-
lute mode means that the zero point deviation (also known as ZERO-offset) of the inclination sensor has
to be compensated for or eliminated. This compensation is done through a reversal measurement, which
is part of the software, before proceeding with the actual measurement.

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