Rice Lake BenchMark CW-80 Base - Manual (Page 6)

2 Benchmark HD Series
2.0 Installation
Remove the scale from the shipping container and place it in the desired location. Select a location for the CW-80B
that is reasonably level and free of unnecessary vibrations and air currents.
2.1 Leveling
CAUTION
Do not lift the scale by the spider assembly that supports the platter. Lifting by the spider can damage the
load cell. Always lift under the base when moving the scale.
Remove the scale platter and locate the bubble level. Adjust the four corner feet on the base until the bubble level
on the inside frame of the unit reads level. When level, the base should not rock and all four feet should have solid
contact with the support surface. If using a column with the scale, adjust the two column feet until they make solid
contact with the support surface.
2.2 Grounding
Bench scales can build up a charge of static electricity during weighing operations. If powerful enough, this charge
can travel through the load cell cable to the indicator. To prevent this, all bench scales should be grounded so that
static charges and transient electrical surges can drain directly to ground.
A chassis ground screw is located on the bottom of the platform (number 26 on the parts diagrams shown on pages
4 and 5) to facilitate grounding. Use a ground wire of at least 18 gauge copper to connect this screw to the same
earth ground as the attached indicator.
2.3 Load Cell Wiring and Specifications
Use the wiring code shown in Table1-1 when connecting the CW-80B bench scale to your indicator. Refer to the
indicator manual for information about indicator connections and calibration.
Table 2-1. RL1380 load cell wiring code
Color Function
Green +Excitation
Black –Excitation
White +Signal
Red –Signal
Yellow Shield
Table 2-2. Load cell specifications
RL1380 Load cell specifications
Full scale output 2.0 mv/V
Bridge resistance 350

Material Stainless steel
Temperature 14°F–104°F / -10°C to 40°C
(compensated range)
Safe overload 150% full scale
Rated excitation 10V AC/DC (15V maximum)
Combined error 0.03% full scale
Insulation resistance 1000 M

Seal type Environmentally protected
Cable length 10 ft/3.1 m