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¦ | PART II | - OPERATION | ¦ |
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| LOAD CELL | CALIBRATION |
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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). |
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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. |
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To do so: |
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BE SURE | the weigh bin | is EMPTY. |
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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. |
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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: |
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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: | ¦ | ||
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| 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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