horiba OM-71G, Instruction Manual

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Troubleshooting
51
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The indicated value does not change/No response
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The measured value blinks
The measured value blinks when it is out of the measurement range.
• How to check for instrument defect
Short the metal part of the outer tube to the center pin of the electrode
connector of the corresponding channel of the instrument. If the
measured value does not blink, the instrument is normal. If the
measured value blinks, consult your dealer.
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Repeatability of the measured value is poor
Cause How to solve problem
The responsive membrane is
damaged or worn out.
Replace the electrode chip.
The electrode is not connected
correctly.
Connect the electrode correctly.
Keys are locked.
Turn off the power, remove the batteries, and then turn
on the power again.
The instrument is in HOLD state. Cancel the HOLD state.
Instrument defect
Consult your dealer.
Cause How to solve problem
Sample is out of the
measurement range.
Use a sample within the measurement range.
The electrode cable is broken. Replace the electrode.
Calibration is not performed or
performed incorrectly.
Perform the calibration correctly.
Instrument defect Check as explained below.
Cause How to solve problem
Effect of the sample solution
Repeatability becomes poor when the dissolved oxygen
of the sample changes over time.
The responsive membrane is
dirty.
Wash the responsive membrane.
The responsive membrane is
damaged or worn out.
Replace the electrode chip.