Maguire Products, Inc.
81
LineMaster
Load Cell Zero Weight Calibration
This unit was properly calibrated for zero and full weight at the factory to match the load cells
specific to the LIW model. It should not be necessary to re-calibrate during installation.
Recommended calibration interval is about every 6 months of operation.
To zero the load cells, do the following:
BE SURE
the weigh hopper is EMPTY.
BE SURE
the load cell plug is plugged into the side of the controller.
BE SURE
the weigh hopper is resting on the load cells freely.
BE SURE
The load cells and weigh hopper are not jammed in any way. To test for this, press the CE key to
display the raw load cell and grams of weight within the hopper. An empty hopper should display
zero grams (to the upper-right of the display) and the raw load cell number (to the upper left of the
display). While observing the grams in the upper-right of the display, apply pressure to the weigh
hopper. The grams should increase when pressure is applied and decrease when pressure is
removed. The display must return to exactly where it was, plus or minus 1 gram. Note: the pressing
the CE will display the grams and raw count for 30 seconds before returning to the normal display.
If this does not happen, there is interference and the weigh hopper is not entirely free to move.
Check EVERYTHING around the weigh hopper.
LOAD CELL CALIBRATION:
The sequence of keystrokes is as follows:
Load Cell Zero Calibration Keypad Sequence:
Press
Display will say:
ENTER PASSWORD
Press
Display will say:
PROGRAM MODE, INSTRUCTION [ ]
Press
Display will say:
CALIBRATION MODE DISABLED
Press
Display will say:
CALIBRATION MODE, LIW LOAD CELLS
Press
Display will say:
PROGRAM
Press
Display will say:
LIW CELL ZERO -- WAIT --
Followed by:
SUCCESSFUL
The display will then show the
raw load cell count
and a gram weight of
0
After 30 second the display will return to
PROGRAM
Press
To exit program mode and return to normal operation
The ZERO point of the load cells is now set properly. FULL weight calibration may also be done at this time,
however, it probably is NOT NECESSARY. When load cell readings shift due to rough handling, the entire
range of readings from ZERO to FULL shift together. The ZERO weight calibration routine resets the full
range of the cells and, therefore, corrects FULL weight readings as well. For information on FULL weight
calibration, see the next page, RECALIBRATION OF LOAD CELLS.
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