WIKA PSD-4 Mode D'emploi page 26

8. Dismounting, return
8.2 Return
Strictly observe the following when shipping the instrument:
All instruments delivered to WIKA must be free from any kind of hazardous substances (acids, bases, solutions, etc.)
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and must therefore be cleaned before being returned.
WARNING!
Physical injuries and damage to property and the environment through residual media
Residual media in the dismounted instrument can result in a risk to persons, the environment and
equipment.
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When returning the instrument, use the original packaging or a suitable transport packaging.
Information on returns can be found under the heading "Service" on our local website.
8.3 Disposal
Incorrect disposal can put the environment at risk.
Dispose of instrument components and packaging materials in an environmentally compatible way and in accordance
with the country-specific waste disposal regulations.
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With hazardous substances, attach the material safety data sheet for the corresponding medium.
Clean the instrument, see chapter 7.2 "Cleaning".
WIKA operating instructions pressure switch, model PSD-4