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Betriebsanleitung/Operating manual
F3301/F33C1/F33S1
4
Design and method of operation
4.1
Measuring element
Innovative manufacturing methods using the DMS principle have re-
cently been developed. Etched wire strain gauges are not used in this
case. The entire Wheatstone bridge with the necessary equalisation re-
sistances and temperature compensation is realised using a thin-film
method on a metallic, pot-shaped body. The bridge circuitry of the sen-
sors is actively calibrated during the manufacturing process using laser
calibration. This thin-film sensor is then welded into in an appropriately
shaped measuring spring with the aid of a laser welding method. The
thin-film sensor and the optional electronics are sealed against moisture
and dust.
4.2
Measuring procedure and output signal
The force acting in the measuring direction causes the measuring
spring to become elastically deformed and therefore also the welded-in
thin-film cell. This deformation generates a resistance change in the in-
dividual bridge resistors. If the measuring bridge is now supplied with a
feed voltage, a measuring signal that is proportional to the force occurs
at the bridge output. This signal can be output provided with the aid of
integrated amplifiers as standardised 4-20 mA, 0-10 V or as a CANo-
®
pen
output signal.
For the use in combination with the ELMS1 overload protection
only an opposing 4 ... 20 mA signal (redundant) is approved.
Therefore please note the instructions in the original operating
manual for ELMS1 overload protection.
5
Deployment location conditions
5.1
Ambient temperature
The temperature range of -20° C to +80° C that is specified in the data
sheet applies with regard to deployment. The specified error limits are
not guaranteed outside this temperature range. Temperature gradients
in the load cell must be avoided if possible. One-sided or local heating
of the load cell can cause large measuring errors.
The temperature errors specified in the data sheet always relate
to the entire measuring device up to the plug or the end of the
cable (including the integrated amplifier).
26
BD_BE_973 b
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