Specifications

Chapter 7: Flexmount HD Weigh Modules
Weigh Module Orientation
(12/99) 7-3
Weigh Module
Orientation
In a typical tank scale application, three or four weigh modules would be used to
support the tank. To provide accurate weighing, this system of weigh modules must
allow for the thermal expansion and contraction of the tank. A Flexmount HD weigh
module system does this by incorporating three different top plate designs:
Fixed Pin: The opening in the underside of the top plate is sized to hold the load pin
securely. This anchors the weigh module system by providing a fixed point that allows
no horizontal movement.
Semi-Floating Pin: The opening in the underside of the top plate is sized to allow the
load pin to move in two directions. This accommodates expansion and contraction but
keeps the scale from rotating around the fixed pin.
Full-Floating Pin: The opening in the underside of the top plate is sized to allow the load
pin to move in any horizontal direction.
An installation should include one fixed-pin weigh module and one semi-floating pin
weigh module. The semi-floating pin module should be positioned directly across from
the fixed-pin module or at the support location farthest from the fixed-pin module. Full-
floating weigh modules should be used at all other support locations. Tank legs or
structural support lugs must be rigid enough so that the weight of the full tank does not
cause them to spread out.
Recommended mounting arrangements are shown in Figure 7-2.
NOTE: In each of the mounting examples above, the semi-floating module is located
and oriented to make full use of its expansion/contraction limits while providing
resistance to the rotational moment about the fixed pin. The semi-floating module must
be installed in this manner to provide optimum performance and system self-checking.
Figure 7-2: Plan View of Mounting Arrangements
Fixed Pin
Semi-Floating Pin
Full Floating Pin
Rectangular or Square Mounting
Longest Side
Circular Mounting
90
°
90
°
120
°
FULL FLOATING
FIXED
SEMI-FLOATING