9
U2B
HBM 24.5.2000
2.4
Compensating for disturbance variables
The geometry of the measuring body and the positioning of the SGs ensure
that the output signal from the transducer suffers only minimal distortion if the
force being measured is affected by superimposed lateral forces and/or tor-
sional and bending moments. The specifications for this can be found in the
Technical Data. In the interests of greater accuracy, however, it is generally
better to try to prevent spurious loadings of this kind altogether. The U2B also
has separate lateral force compensation which reduces lateral force in-
fluences to a minimum (see Technical Data).
The influence of temperature on the zero signal and sensitivity are compen-
sated. Changes in ambient pressure have the same effect as additive (sub-
stractive) forces (see Section 3.3).
3
Operation on site
3.1
Ambient temperature
For optimum measurement results, keep to the rated temperature range. The
best conditions are constant or very slowly changing temperatures. Measure-
ment errors due to temperature are the result of uneven warming (e.g. radiant
heat) or cooling. A radiation shield and all-round heat insulation provide no-
ticeable improvements. However, they should not be allowed to form any kind
of force leakage.
3.2
Humidity
Extremes of humidity or tropical conditions have no effect on the measure-
ment capability of the transducer, provided they are within the specified limit
values (protection system IP67 in accordance with DIN EN 60529).
Note:
Moisture should not be allowed to penetrate the free end of the connector
cable.
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