
Order no.
031-1CA20
Environmental conditions
Operating temperature
0 °C to 60 °C
Storage temperature
-25 °C to 70 °C
Certifications
UL certification
in preparation
KC certification
in preparation
3.16.4
Functionality
3.16.4.1
Basics - Strain gauge DMS
Strain gauge DMS are fixed directly on a body or part of a sensor and serve for the fol-
lowing possibilities:
n
Measurement of strains, compressions or torsions
n
Measurement of forces and movements
There are the following strain gauge DMS types:
n
electrical strain gauge DMS
–
An
electrical strain gauge DMS
consists of a carrier material (e.g. stretchable
plastic film) with applied metal film. From this a grid of electrically conductive
resistive material is created. During the measurement the behavior is used, that
e.g. at the elongation of a metallic conductor resistance its length increases and
its diameter decreases. Here the electrical resistance increases proportionally.
n
optical strain gauge DMS
–
An
optical strain gauge DMS
consists of a fibre used as a sensor, with a laser-
applied grid in the fibre. During the measurement the behavior is used, that with
mechanical load the optical properties of the sensor are changed. Light is passed
with a certain wavelength into the sensor. Depending on the deformation of the
laser-applied grid of the sensor, a part of the light is reflected and evaluated with a
suitable sensor (interrogator).
n
Nominal load
–
Maximum permissible load for normal operation.
–
The
nominal load
is preset unit-free.
n
Rated output
–
The rated output is a measure of the sensitivity of the resistance bridge in
dependence of the used excitation voltage.
–
A typical value for a full bridge is 2mV/V, this means at nominal load with an exci-
tation voltage of 12V the bridge differential voltage is ±24mV.
–
The common area is 0.5...4mV/V, depending on the bridge and sensor type.
Strain gauge DMS
Characteristics of an
strain gauge DMS
VIPA System SLIO
Analog Input
031-1CA20 - AI 1x16(24)Bit Strain gauge (DMS) > Functionality
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