Specifications

METTLER TOLEDO Weigh Module Systems Handbook
(12/99)14-48
Ultramount Weigh
Modules
Dynamic Ball-and-Cup Suspension
The portions of this specification that have been left blank ( __________ ) should be
filled with information about the specific application. Information for the blanks in
Section 1.1 can be found in Table 14-33. Information for the blanks in Sections 4.3.1 to
4.3.9 can be found in Table 14-34.
1 General Provisions
1.1 Provide a complete system consisting of ______ (qty) ______ kg
stainless steel weigh modules to convert a freestanding structure into
a scale.
1.2 Each module shall include load cell, top and bottom mounting plates,
self-aligning suspension, and anti-lift restraints.
1.3 The system shall include a stainless steel NEMA 4X/IP65 summing
junction box.
1.4 Each weigh module shall be completely factory assembled.
2 Mechanical Specifications
2.1 The system shall be completely self-checking and self-aligning. No
additional check rods, links, or stays are required.
2.2 The load point on each load cell shall remain stationary. Modules
shall be designed to allow lateral movement of the module top
mounting plate without changing the load point on the load cell, or
allowing the load introduction mechanism between the top plate and
the load cell to be out of a vertical position. Load cells which allow
movement of the load point on the load cell are not acceptable.
2.3 The load introduction mechanism between the top plate and the load
cell shall be a ball bearing constructed of hardened 17-4ph stainless
steel. The ball bearing shall make point contact against the hardened
stainless steel bearing cups. One bearing cup shall be installed in the
top mounting plate and one bearing cup shall be installed in the load
cell. The ball bearing suspension shall cause the top plate to realign
with the load cell after encountering side loads. Direct bolt
connections between the top mounting plate and the load cell are not
acceptable.
2.4 Each module shall be equipped with two integral hold-down bolts
designed to prevent the vessel from being uplifted off the weigh
module.
2.5 The hold-down bolts shall serve as alignment tools to correctly
position the top mounting plate over the load cell during installation.
2.6 The hold-down bolts shall secure the top plate during shipping and
installation. They shall be capable of taking the load off the load cell
to protect the load cell from possible shock during shipping and
installation. In addition, the hold-down bolts shall facilitate load cell
replacement by serving as jacking devices for the empty vessel.
3 Material and Finish Specification
3.1 Load cells and bearing cups shall be made of hardened 17-4ph
stainless steel. Ball bearings shall be made of hardened 440
stainless steel.
3.2 Top and bottom mounting plates shall be made of type 304 stainless
steel and have an electro-polished finish.