Conditions On Site; Ambient Temperature; Moisture And Humidity; Deposits - HBM S9M Notice De Montage

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Conditions on site

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
thermal insulation produces noticeable improvements, but must not be al­
lowed to set up a force shunt.

4.2 Moisture and humidity

Series S9M force transducers are hermetically encapsulated and are there­
fore very insensitive to moisture influence. The transducers reach the protec­
tion class IP68 per DIN EN 60259 (test conditions: 100 hours under 1 m water
column). Nevertheless, the force transducers must be protected against per­
manent moisture influence.
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.

4.3 Deposits

Dust, dirt and other foreign matter must not be allowed to accumulate
sufficiently to divert some of the measuring force, thus invalidating the
measured value (force shunt).
NOTE
Measurement errors may be the result if dust or dirt is deposited inside the
force transducer. The relevant areas are marked by arrows in Fig. 4.1.
HBM
S9M
A3019-5.0 en/de/fr