Conair WSB - Manual (Page 14)

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¦ PART II - OPERATION ¦
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LOAD CELL CALIBRATION
NOTE: Display examples shown here are in tenths of grams as displayed
On 100 and 200 series models. 400, 900 and 1800 series models
display full grams, no decimal.
If your load cells are displaying a weight close to ( 0.0), plus or
minus 5 grams, you may skip this section and go directly to
RATE CALIBRATION (next page).
If your unit DOES NOT display a weight of ( 0.0) grams, plus or
minus 5 grams, you should recalibrate them, that is reset ZERO weight,
at this time.
To do so:
BE SURE the weigh bin is EMPTY.
BE SURE the load cell plug is plugged into the side of the controller.
BE SURE the weigh bin is resting on the load cells freely.
BE SURE the air line to the dump valve is connected as it would be
during normal operation. (A disconnected air line adds weight.)
BE SURE The load cells and bin are not jammed in any way. To test for
this see that a light touch on the bin causes the display to
change. When the pressure is removed the display must return
to exactly where it was, plus or minus 0.1 gram.
If this does not happen, something is touching something and
the bin is not entirely free to move. Check EVERYTHING around
the bin.
LOAD CELL CALIBRATION:
The sequence of keystrokes is as follows:
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¦ Press: * Display will say: (PASSWORD) ¦
¦ Press: 22222 Display will say: (P x.x) ¦
¦ Press: *99 Display will say: (CAL OFF) ¦
¦ Press: * Display will say: (CAL ON ) ¦
¦ Press: EXIT Display will say: (P x.x) ¦
¦ Press: ZERO WT Display will say: (--WAIT--) ¦
¦ followed by: (P 0.0) ¦
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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. ZERO weight
calibration resets the full range of the cells and, therefore, corrects
FULL weight readings as well. For information on FULL weight
calibration, see RECALIBRATION OF LOAD CELLS section.
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¦ PROCEED TO: RATE CALIBRATION NEXT PAGE ¦
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Page 15