Horiba Scientific LAQUAact D-72G, Instruction Manual

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Troubleshooting
60
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Repeatability of the measured value is poor
●
Nothing appears when the power is turned ON
●
Swelling of operation key sheet
Cause How to solve problem
Effect of the sample solution
Repeatability becomes poor when the pH of the sample
changes over time.
The electrode is dirty.
Clean the electrode. (Electrode cleaning solution 220 or
250 is recommended.)
The electrode is cracked. Replace the electrode.
The internal solution of the
electrode runs out or
contaminated.
Replace the internal solution with new one.
The level of internal solution in
reference electrode is low. Replenish the internal solution of the reference electrode
until it is higher than the level of the sample.
Cause How to solve problem
Power is not supplied. Insert batteries or connect the AC adapter (option).
Battery polarity (+,

) is
reversed.
Insert the batteries with the polarity (+,

) correctly
oriented.
Battery life is low. Replace the batteries or connect the AC adapter (option).
Instrument defect Consult your dealer.
Cause How to solve problem
Using the instrument at high
elevation or other location where
the air pressure is different from
sea level. To eliminate the pressure difference between the inside
and outside of the instrument, briefly open and then close
the AC adapter cover. After opening, correctly close the
cover to maintain dust and water proofing.
Instrument defect Consult your dealer.