Conditions On Site; Ambient Temperature; Moisture And Humidity - HBM U93 Montageanleitung

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Conditions on site

Protect the transducer from extreme moisture and dampness, weather condi­
tions such as rain, snow and ice, and salt water.

4.1 Ambient temperature

The temperature effects on the zero signal and on the sensitivity are compen­
sated.
To obtain optimum measurement results, the nominal (rated) temperature
range must be observed. Constant, or very slowly changing temperatures are
optimal. Temperature‐related measurement errors are caused by heating on
one side (e.g. radiant heat) or by cooling. A radiation shield and all‐round ther­
mal insulation produce noticeable improvements, but must not be allowed to
set up a force shunt.

4.2 Moisture and humidity

Series U93 force transducers are hermetically weld‐sealed, giving them de­
gree of protection IP67 per DIN EN 60529 (test conditions: 100 hours under
1 m water column). Nevertheless, the force transducers must be protected
against permanent moisture influence.
NOTE
Moisture must not be allowed to penetrate the free end of the connection
cable. Otherwise the characteristic values of the transducer could vary, and
cause measurement errors.
The transducer must be protected against chemicals that could attack the
transducer body steel or the cable. With stainless steel force 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 force transducer to fail. In
this case, appropriate protective measures must be implemented.
HBM
U93
A2081-2.2 en/de/fr