Kistler-Morse KM LD3xi Load Cell - Manual (Page 7)

Chapter 1. Description
1-1
Chapter 1:
Description of the Load Disc
This chapter describes the Load Disc 3xi/3xiC/3xiMJ
Compression Load Cell and its installation options.
Introduction
General Description of Measurement System
The deflection of the load cell by the vessel weight is measured by the foil
gage sensor, which is entirely sealed within the watertight cavity of the
transducer. The sensor converts the deflection into an electrical signal which is
directly proportional to the increase or decrease of the vessel contents.
Material movement and changes in material repose will not affect the accuracy
of the system. Accurate weight information is then sent to a signal processor
for display, information transmission and storage (See Figure 1-2).
Figure 1-1:
LD3xi Compression Load Cell
with optional NEMA-6P cable
system
The Load Disc 3xi/3xiC/3xiMJ is a low profile load cell that is bolted to both
the support surface and the vessel supports, and is used to measure the
weight of materials in vessels and tanks. The sealed, stainless steel construc-
tion--IP68 rated unit with an optional NEMA-6P watertight cable system and
cable entry–makes the LD3xi/3xiC/3xiMJ ideal for use in high-pressure wash
down and occasionally submerged environments. The LD3xi/LD3xiC/3xiMJ
offers system performance accuracy of 0.03%.
The low-profile design for low clearance installations also keeps the vessel’s
center of gravity low and stable. Vessel tipping, walking or overturning while
agitating is eliminated. Installation and setup is simplified with less hardware.
No external vessel hold-downs are necessary, even in areas of high wind or
seismic activity. There are no moving parts that can wear out or require
replacement.
In bakery, pasta, confectionary and spice processing to resins, concrete/
aggregate, sand, pulp, minerals and other dry-to-wet operating conditions,
the LD3xiC offers very specific advantages not available in most higher
priced load cells. Standards include a tough “cage” mounting fixture into
which the 17-4 stainless steel LD3xiC cell securely locks in place. Since the
LD3xiC cell can be loaded before or after the tank is installed onto the “cage”
fixture, you have more flexibility in mounting procedures. If ever the cell
needs to be replaced, it can be unloaded without having to remove the
“cage” fixture itself. The LD3xiC is available in virtually all popular weight
capacities from 220 lbs to 22,000 lbs. and is easy to specify due to identical
dimensions and price.
Applications Description
The watertight design of the load cell makes it ideal for measuring bulk
material in the sanitary and clean-in-place environments. It is particularly
suitable for use on mixing and blending vessels, surge hoppers, and agitated
vessels. Rugged, solid, bolt-in-place mounting assures vessel stability in
outdoor storage vessels with gussets or legs used in all process industries.
weight/4
weight/4
weight/4 weight/4
LD3 xi/
LD3xiC
(x4)
signal
processor
junction box
Signal
transmission/
Serial Output
Setpoints for
signaling a
change in staus,
such as high and
low alarms
Figure 1-2:
General installation layout for LD3xi/
LD3xiC using a junction box.