Mettler Toledo LJ16 Spécifications télécharger pdf (Page 159)

Chapter 14: Appendices

Appendix 11: Engineering Specifications

(12/99) 14-39

Centerlign Weigh Modules

The portions of this specification that have been left blank ( __________ ) should be

filled with information about the specific application. Information for the blanks in

Sections 1.1 and 5.3.11 can be found in Table 14-27 (Table 14-29 for OIML

applications). Information for the blanks in Sections 5.3.1 to 5.3.9 can be found in

Table 14-28 (Table 14-30 for OIML applications). If carbon steel weigh modules are

specified in Section 1.1, use the Material and Finish Specifications for carbon steel

weigh modules (Section 3). If stainless steel weigh modules are specified in Section

1.1, use the Material and Finish Specifications for stainless steel weigh modules

(Section 4).

General Provisions

1.1

Provide a complete system consisting of ______ (qty) ______ lb/kg

_______________ (carbon steel or 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 required installation tools.

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.

Mechanical Specifications

2.1

The system shall be completely self-checking. 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 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 rocker pin design constructed of hardened 17-4ph

stainless steel. The load pin shall have an O-ring seal at each 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.

2.4

Each module shall include an alignment tool to accurately position

the upper mounting plate relative to the load cell.

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).

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.

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