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.
To Next Page
Loading...
Need help?
General