Conditions On Site; Ambient Temperature; Moisture And Exposure To Chemicals - HBM SLB-700A/06 Notice De Montage

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Conditions on site

4.1 Ambient temperature

Changes in temperature cause the construction to expand, which will vary the
zero point. Strain transducers are therefore compensated, so that they equal­
ize the thermal strain of the construction rather than displaying it.
For common structural and tool steels such as C45, 1.1730, this compensa­
tion occurs with a thermal expansion coefficient α of 12 ⋅ 10
If the device is mounted on a construction with a different thermal expansion
coefficient, a temperature‐dependent signal is produced that corresponds to
the temperature strain of the materials less 12 ⋅ 10
Tip
If it is possible to reset the zero signal at frequent intervals (zeroing), the ef­
fect of temperature change on the zero signal can be ignored.
Temperature has little effect on sensitivity. Basically, the effect is produced by
the change in the modulus of elasticity of the object on which the strain trans­
ducer is mounted. Heat reduces the modulus of elasticity, so that the same
force acting on the component will produce greater strain, and thus a higher
measured value. Similarly, cold produces the reverse effect.
To obtain optimum measurement results, the nominal (rated) temperature
range must be complied with.

4.2 Moisture and exposure to chemicals

The transducers attain protection class IP65 per DIN EN 60529 (test condi­
tions: 0.5 hours under 1 m water column) and are thus waterproof for a short
time. Despite this, the transducers should be protected against long‐term ex­
posure to moisture or weather conditions such as rain, snow, etc.
The transducers must be protected against chemicals that could attack the
transducer body steel, the silicone, or the cable.
With stainless steel transducers, please note that acids and all materials
which release ions will also attack stainless steels. Should there be any corro­
sion, this could cause the transducer to fail. If this is the case, you must pro­
vide appropriate means of protection.
HBM
SLB-700A/06, SLB-700A/12
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/°C.
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/°C.
A2112-3.0 en/de/fr