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4
Conditions on site
4.1 Ambient temperature
Temperature changes lead to an expansion of the structure and therefore to a
change in the zero point. The strain transducers are therefore compensated
so that they can equalize and not display the thermal strain of the structure.
This compensation is implemented for standard construction and tool steels ,
e. g. C45, 1.1730, with a thermal expansion coefficient of 12 10
If mounted on a structure with a different thermal expansion coefficient, a tem-
perature-dependent signal is output that corresponds to the temperature ex-
pansion of the material less 12 10
Tip
If it is possible to reset (zero setting) the zero signal at short intervals, the in-
fluence of the temperature change on the zero signal can be ignored.
The influence of the temperature on the sensitivity is low. The influence re-
sults mainly from the change in the E modulus of the object on which the
strain transducer is mounted. The E modulus becomes smaller under the in-
fluence of heat and therefore a greater strain and higher measured value will
result when the same force is applied to the component. The reverse effect
occurs under the influence of cold.
To obtain optimum measurement results, the nominal (rated) temperature
range must be complied with.
4.2 Moisture and chemical effects
The transducers reach the protection class IP65 as per DIN EN 60529 (test
conditions: 0.5 hours under 1 m water column) and are therefore briefly wa-
tertight. Nevertheless, the transducers must be protected against long-term
effects of moisture or weather such as rain, snow, etc.
The transducers must be protected against chemicals that could attack the
transducer body steel, silicone or the cable.
With stainless steel transducers, please note that acids and all materials
which release ions will also attack stainless steels and their welded seams.
Should there be any corrosion, this could cause the transducer to fail. In this
case, appropriate protective measures should be implemented.
HBM
SLB700A/06VA1, SLB700A/06VA2
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A3253-2.0 en/de/fr
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