Specifications

Chapter 14: Appendices
Appendix 11: Engineering Specifications
(12/99) 14-29
to be out of a vertical position. Load cells which allow movement of
the load point on the load cell are not acceptable.
2.6 The load introduction mechanism between the top plate and the load
cell shall be a pin design constructed of hardened 17-4ph stainless
steel. The load pin shall have an O-ring seal at one end to prevent dirt
and other foreign material from entering the load cell bearing surface.
Direct bolt connections between the top mounting plate and the load
cell are not acceptable.
2.7 Each module shall be equipped with an integral hold-down bolt
designed to prevent the vessel from being uplifted off the weigh
module.
2.8 The hold-down bolt shall serve as an alignment tool to correctly
position the top mounting plate over the load cell during installation.
2.9 The hold-down bolt shall secure the top plate during shipping and
installation. It 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 bolt shall facilitate load cell
replacement by serving as a jacking device for the empty vessel.
3 Material and Finish Specification (for Carbon Steel Weigh Modules)
3.1 Load cells and load pins shall be made of hardened 17-4ph
stainless steel.
3.2 Top and bottom mounting plates shall be abrasive blasted to 1.5 to
2.5 mils profile per SSPC-SP10 (Near White Blast).
3.3 Mounting plates shall be painted with Carboline 890 high-build epoxy
enamel. Coating must be cured to 3-6 mils DFT.
3.4 Coating must meet USDA regulations for incidental food contact.
3.5 Coating shall be lead and chromate free and cannot contain any
substance defined as carcinogenic by the U.S. EPA.
3.6 Coating must be suitable for salt solution immersion.
3.7 Coating must be chemical resistant per ASTM D3912 (Splash,
Spillage, and Fumes).
4 Material and Finish Specification (for Stainless Steel Weigh Modules)
4.1 Load cells and load pins shall be made of hardened 17-4ph
stainless steel.
4.2 Top and bottom mounting plates shall be made of type 304 stainless
steel and have an electro-polished finish.
5 Load Cell Specifications
5.1 All load cells shall meet or exceed the National Institute of Standards
and Technology (NIST) Handbook 44 for Class III weighing devices
and shall be certified by the National Type Evaluation Program
(NTEP) for 3,000 division Class III accuracy.
5.2 OIML load cells can be offered as an option.
5.3 Load cells shall have the following individual characteristics:
5.3.1 Rated Capacity (R.C.): ____________
5.3.2 Rated Output: ____________
5.3.3 Zero Balance: ____________
5.3.4 Combined Error Due To
Non-Linearity & Hysteresis: ____________
5.3.5 Non-Repeatability: ____________
5.3.6 Temperature Compensation: ____________
5.3.7 Terminal Resistance
Input: ____________
Signal: ____________