Page 45 - Lehrbuch Neigungsmessung deutsch 2018.indd

COMPENDIUM INCLINATION MEASUREMENT
WYLER AG, WINTERTHUR / SWITZERLAND

Our SEALTEC technology was developed in response
to demand for instruments that perform under extreme
environmental conditions such as high humidity and lar- Wireless
ge temperature ranges. The sensor cells of the instru- Housing welded to transmission
ments are filled with nitrogen, and laser welded to be be gastight module
gastight.
Thanks to this engineering advancement, the BlueLE-
VEL and BlueLEVEL BASIC can be used in very difficult
climatic conditions.

Sensor with electrodes Processor
and pendulum Prints

The picture shows a blue level with view of the
sensor and the prints with wireless module

The deflection of the pendu- X = Gravitation of pendelum
lum follows a sine function. For Y = f (sin , X)
small inclinations up to about Z = Deflection of pendulum
±1 degree we are in the line-
ar range of the sine curve (see
right). The magnitude of the de-
flection depends of course on
the material (module of elastici-
ty), the thickness of the pendu-
lum, the length and the air gap
of the spiral.
For larger inclinations the curve
corresponds to the sine function
and is no longer linear. Accordin-
gly, devices with greater measu- Sine of angle in a range Sine of angle in a range
ring range have to be calibrated up to 90 degrees from 0...10 Arcmin
with so-called calibration points.
In measuring instruments with a smaller range, for example ±1 degree, the pendulum has to be more
sensitive to the slightest inclination in order to achieve optimal resolution. This sensitivity is achieved in
this case by a thin membrane with a long spiral spring. For larger ranges, a thicker pendulum with a shorter
spiral length is selected.
Variable as a function of the measuring range: Deflection of the pendulum with a measuring range
• Thickness of the pendulum from of ±10 degrees:
50 up to 100 μm
• Length of the spiral from 300° up to 630° Deflection at an inclination of 1 μm/m: approx. 10 nm

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