Specifications
Chapter 14: Appendices
Appendix 11: Engineering Specifications
(12/99) 14-57
Ultimate Overload: 300% of R.C.
Safe Side Load: 100% of R.C.
4.4
Load cells shall be constructed of 17-4ph stainless steel and shall
have an environmentally protected gauge cavity.
4.5
Each load cell shall have a sealed cable fitting on the cable entrance
into the load cell for enhanced moisture protection.
4.6
Each load cell shall have a data plate affixed to the load cell which
clearly shows:
4.6.1
Manufacturer
4.6.2
Capacity
4.6.3
Part Number
4.6.4
Serial Number
4.6.5
Class Number
4.6.6
NTEP Certificate of Conformance Number
4.6.7
Maximum Divisions (Nmax)
4.6.8
Load Cell Vmin
5
Junction Box Specifications
5.1
Junction box enclosure shall be constructed of type 304 stainless
steel and shall be designed to NEMA 4X/IP65 standards.
5.2
The junction box enclosure shall have washdown duty connectors,
one for each load cell cable, and one additional connector for the
instrument cable. Multiple cables using single box connectors are not
acceptable.
5.3
The junction box shall contain a printed circuit board for the purpose
of individual load cell wiring termination, summing of the output
signals from each load cell, trimming/balancing the load cell signals,
and wiring the interface to the digital instrument.
5.4
The printed circuit board shall have individual connectors for each of
the load cells, and the instrument interface cable. Each wire shall
have a single terminal connection. Doubling up or ganging of wires
to one terminal is not acceptable.
5.5
The summing printed circuit board shall have potentiometers, one per
load cell for the electrical trimming/balancing of the load cell signals
during calibration.
6
Warranty
6.1
The product shall be free from defects in workmanship and materials
for a period of 1 year from date of original installation, or 18 months
from the date of shipment to the original buyer, whichever occurs first.
Technician travel time and mileage costs shall be covered by the
manufacturer for the first 30 days after installation, with on-site labor
and replacement parts covered for the first 12 months after
installation.
7
Acceptable Manufacturers
7.1
Scale system shall be METTLER TOLEDO 0978 Tension Weigh
Modules.