HBM PW27A, Mounting Instructions

Page: 10 / 52

Conditions on site
8
A05201_02_Y00_00 HBM: public
PW27A
3 Conditions on site
Series PW27A load cells are hermetically encapsulated and are therefore not
at all sensitive to the influence of moisture and humidity. The transducers attain
protection class IP68 (test conditions: 100 hours under 1 m water column) and
IP69K (water at high pressure, steam cleaner), as per DIN EN60529.
Nevertheless, the load cells must be protected against constant humidity and
moisture.
3.1 Protection against corrosion
The load cell must be protected against chemicals that could attack the
transducer body steel, or the cable.
Notice
Acids and all substances that release ions also attack stainless steels and their
welded seams.
Should there be any corrosion, this could cause the transducer to fail. If this is
the case, you must provide appropriate means of protection.
3.2 Cleaning
The load cell has been designed according to the EHEDG design guidelines to
allow for easy, mild cleaning. When mounting the load cell, make certain it can
be reached from all sides for cleaning. Cleaning can be performed without dis­
mounting the load cell and should be done regularly. The surface of the load
cell must not be damaged with sharp-edged brushes during cleaning.
3.3 Deposits
Dust, dirt and other foreign matter must not be allowed to accumulate
sufficiently to divert some of the measuring force onto the housing, thus
invalidating the measured value (force shunt).