DS Europe 500QD Series, Instructions Manual

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13
The body of the cell can rotate, about ±10 degrees, on its axis. Before the final
clamping of the screws of the lid rotate the measuring body so to obtain the
maximum electrical signal output from the cell: this maximum value means the
coincidence of the weighing and of the measuring axes. Now make the final
clamping of the fixing screws of the lid and of the grub screw on the central body.
Important: during the transport and the installation, the cell has not to be submitted to
overloads that can destroy it.
Where possible, it is imperative to settle overload protectors (= blocks) in all the
directions (x-y-z) between shaft or cylinder and frame or other fix points of the
machine.
The overload protectors (blocks) have to be taken away in normal operation.
For the electrical connection of the not amplified cell: see chapter 7.
Series BC 300:
Central pin:
The measuring force has to be applied only on the pin and not on the diaphragm, also
for the models BC 301 – BC 305 with screwed pin.
Moreover the weighing force has to coincide with the pin axis without any
transversal component of the applied force.
External circular bearer:
The support and the fixing have to be limited only to the external circular crown
without extending to the internal area of the cell.
The setting can be done in several ways: by epoxy cements or by a housing without
cement.
Housing: by a hollow with diameter 0,3÷0,6 mm larger than the cell.
Important: assure at least 0,2÷0,3 mm gap for the deformation of the measuring
diaphragm).
Mod.922 and 942 - Liftsentry:
Fasten the link on a surface stressed to flexion (from 10 to 20 Kg/mm² ), if necessary,
reduce the section of the structure.
Choose a measuring point far from junctions by screws or rivets (weld them) the two
fixing surfaces must be coplanar and finely machined without paint.
Smear on them a thin layer of epoxy cement. Tighten diagramally the screws by
means of a dynamometric wrench.
The hysteresis and the non-return to zero of the measure show a slipping of the
surfaces. Do not use elastic washers.
Do not take care of a high residual out-of-zero: set it to zero by software or by the
zero regulation.
Perform a small mechanical cycling, after having fixed the strain links, before
calibration with external electronics.