Hach POCKET COLORIMETER II Instruction Manual page 54

Analysis systems, sulfate (so4), silica (sio2)
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Error Codes,
8. Underrange—flashing number below stated test range
• Verify instrument cap is correctly seated.
• Check zero by measuring a blank. If error recurs, re-zero the instrument.
• If the problem persists, contact a Service Center
Note:
See
Maximum/Minimum Displayed Value on page 2—26
9. Overrange—flashing number above stated test range
Flashing value will be 10% over the upper test limit.
Note:
• Check for light blockage.
• Dilute and retest sample.
Note:
See
Maximum/Minimum Displayed Value on page 2—26
continued
2—12
(page
2—37).
for more information.
for more information.

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