HBM U10M, Mounting Instructions, Page: 13 / 128

13
U10M, U10S
A1385-6.2 en/de/fr HBM
4 Conditions on site
Protect the transducer from weather conditions such as rain, snow, ice and
salt water.
4.1 Ambient temperature
The temperature effects on the zero signal and on the sensitivity are com­
pensated.
To obtain optimum measurement results, the nominal (rated) temperature
range must be complied with. The arrangement of the SG results in high
insensitivity to temperature gradients due to the construction. Nevertheless,
constant or very slowly changing temperatures are best. A radiation shield
and all‐round thermal insulation produce noticeable improvements, but must
not be allowed to set up a force shunt.
4.2 Moisture and corrosion protection
The force transducers are hermetically encapsulated and are therefore very
insensitive to moisture. The transducers reach the protection class IP67 per
DIN EN 60259 (test conditions: 0.5 hours under 1 m water column). Neverthe­
less, the force transducers must be protected against permanent moisture
influence.
Optionally, the force transducers are also available fitted with a fixed cable. In
this version, all U10 achieve degree of protection IP68 with a nominal (rated)
force equal to or greater than 12.5 kN.
The transducer must be protected against chemicals that could attack the
steel (nominal (rated) forces from 12.5 kN) or aluminum (nominal (rated)
forces up to 5 kN).
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 suffi­
ciently to divert some of the measuring force onto the housing, thus invalidat­
ing the measured value (force shunt). The relevant areas are marked in
Fig. 4.1.