Conditions On Site; Ambient Temperature; Moisture And Corrosion Protection; Deposits - HBM PWS Mounting Instructions

Conditions on site

5 Conditions on site
Protect the sensor from weather conditions such as rain, snow, ice and salt
water.
5.1

Ambient temperature

The effects of temperature on the zero signal and on sensitivity are compen­
sated.
To obtain optimum measurement results, the nominal (rated) temperature
range must be complied with. The strain gauge arrangement results in extreme
insensitivity to temperature gradients, due to the construction (radially symmet­
ric shear force transducer). Nevertheless, constant or very slowly changing
temperatures are best. A radiation shield and all-round thermal insulation pro­
duce noticeable improvements. However, they must not be allowed to set up a
force shunt, i.e. the slight movement of the force transducer must not be pre­
vented.
5.2

Moisture and corrosion protection

Despite the careful encapsulation, it makes sense to protect the transducers
against permanent exposure to moisture. PWS series force transducers
achieve protection class IP67. Nevertheless, the force transducer must be pro­
tected against permanent exposure to moisture.
The sensor must be protected against chemicals that could attack the alu­
minum, potting material or cable.
Corrosion can cause the transducer to fail. A means of protection must be
devised if this danger exists.
5.3

Deposits

Dust, dirt and other foreign matter must not be allowed to accumulate suffi­
ciently to conduct or load any of the measuring force around the transducer,
thus invalidating the measured value (force shunt).
10
A05750_02_XA0_00 HBM: public
PWS