Hardy HI 2151/30WC Single-Scale Controller - Manual (Page 79)

Chapter 6 - Calibration
6-1
CHAPTER 6 - CALIBRATION
Chapter 6 covers calibration procedures for the HI 2151/30WC weight
controller. Users and service personnel should be familiar with these
procedures before installing or operating the HI2151/30WC.
For the weight controller to work properly, it must be calibrated prior to
operation. We also recommend that the instrument be re-calibrated
periodically or when not in use for extended periods. Be sure to follow
the procedures completely to ensure that the weights read by the con-
troller are accurate.
All calibration should be done in the Gross mode.
Pre-Calibration Procedures
Mechanical Check
Procedures Step 1. Check to determine if the load cells have been installed prop-
erly.
• Refer to your load cell I&M manual for proper installation
instructions.
• On some single and double ended shear beam load cells
there is an arrow (
↓) that indicates the direction of the
applied load. If the arrow is pointing in the wrong direction,
change the position of the load cell so that it is mounted in
the direction of the applied load.
Step 2. Check for Binding on the Load Cell or other parts of the sys-
tem.
CAUTION BINDING ON A SCALE/VESSEL OR LOAD CELL DOES NOT ALLOW THE
LOAD CELL FREE VERTICAL MOVEMENT AND MAY PREVENT THE
INSTRUMENT FROM RETURNING TO THE ORIGINAL ZERO REFER-
ENCE POINT.
• A load cell must be mounted in such a way that 100% of the
load (Vessel w/Contents) is vertically passed through a load
cell. (See Fig. 6-1)
• Check to see that nothing is binding the load cell. This
means that nothing is draped across the scale/vessel or the
load cell, such as a hose, electrical cord, tubes, or other
objects.