Conditions On Site; Ambient Temperature; Moisture; Deposits - HBM S9M Montageanleitung

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CONDITIONS ON SITE

6.1

Ambient temperature

The temperature effects on the zero signal and on the sensitivity are compensated.
To obtain optimum measurement results, the nominal (rated) temperature range must be
observed. Constant or very slowly changing temperatures are optimal. Temperature-re­
lated measurement errors are caused by heating on one side (e.g. radiant heat) or by
cooling. A radiation shield and all-round thermal insulation produce noticeable improve­
ments, but must not be allowed to set up a force shunt.
6.2

Moisture

Series S9M force transducers are hermetically sealed and are therefore very insensitive
to moisture influence. The transducers reach protection class IP68 per DIN EN 60259
(test conditions: 100 hours under a 1-meter water column). Nevertheless, the force trans­
ducers must be protected against permanent moisture influence.
The transducer must be protected against chemicals that could attack the transducer
body steel or the cable. On stainless steel force transducers, it must be noted that acids
and all materials which release ions will also attack stainless steels and their seam
welds.
Any resulting corrosion could cause the force transducer to fail. In this case, appropriate
protective measures must be implemented.
6.3

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).
Notice
Measurement errors may be the result if dust or dirt is deposited inside the force trans­
ducer. The relevant areas are marked by arrows in Fig. 6.1.
S9M
CONDITIONS ON SITE
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