Hardy HI 1756-2WS - Manual (Page 53)

Chapter 5 - Calibration
5-1
CHAPTER 5 - CALIBRATION
A Brief Description of
Chapter 5 Chapter 5 provides the recommended calibration pro-
cedures for the HI 1756 (WS or 2WS) Weigh Scale
Module. For the module to work properly, it must be
calibrated prior to operation, and it should be re-cali-
brated periodically or when not in use for extended
periods of time. Be sure to follow all the procedures
completely to insure that the weights read by the mod-
ule are accurate. Users and service personnel should
be familiar with the procedures in this chapter before
installing or operating the Weigh Module.
NOTE: Do not perform a calibration while the application is
in operation.
Pre-Calibration
Procedures Step 1. Determine if the load cells have been
properly installed. See your load cell I&M
manual for proper installation instructions.
Step 2. An arrown on some sensors and cells indi-
cates the correct direction of the applied
load. If the arrow points in the wrong
direction, reposition the load cell.
Step 3. Check for Binding on the Load Cell or
other parts of the weighing system.
CAUTION: BINDING ON A SCALE/VESSEL OR LOAD
CELL CAN DENY THE LOAD CELL FREE
VERTICAL MOVEMENT AND PREVENT THE
INSTRUMENT FROM RETURNING TO THE
ORIGINAL ZERO REFERENCE POINT.
• Mount load cells so that 100% of the load (Vessel
w/Contents) passes vertically through a cell. (See
Fig. 5-1)
• Verify that nothing is binding the load cell. No,
hose, electrical cord, tube, or other object should
be draped across the scale/vessel or the load cell.
• Ensure that nothing contacts the scale/vessel
other than service wires and piping that have
been properly mounted with flexible connectors.