Hardy Instruments A Series - Load Check

Chapter 5 - Calibration
5-3
c. A zero reference point will vary from
system to system depending on the
“Dead Load” of the vessel. “Dead Load”
is the weight of the vessel and appurte
-
nances only, with no product loaded. In
our example we will assume the dead
load to be 500 pounds. (See Fig. 5-2)
FIG. 5-2 MILLIVOLTS/WEIGHT SCALE
Based on the example, the operating range for this
scale is 5-10 mVDC with a 500 pound weight range.
Understand that after zeroing the instrument, the 0
reading refers to the zero reference point and not
absolute 0 mVDC or absolute 0 weight.
NOTE: Load cell/point measurements are checked with a dig-
ital volt meter at the J2 connector on the front of the
module or by using I
NTEGRATED TECHNICIAN with the
HI 215IT Junction Box.
Load Check Step 1. Place a load (weight) on the scale or vessel
and check to see if the weight reading
changes on the ladder logic display in the
proper direction.