Hach NA5600 sc Na+, Maintenance And Troubleshooting Manual

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Problem Possible cause Solution
The instrument
readings are not stable. The analyzer was started
less than 2 hours ago. Let the analyzer operate for 2 hours to become stable.
The electrode cable(s) are
cross-threaded on the
electrodes. Disconnect the cable from the electrode. Push the
connector fully down on the electrode connector, then turn
the connector until finger tight.
The electrode cables are
connected to the wrong
electrodes. Connect the blue cable to the reference electrode.
Connect the black cable to the sodium electrode.
The KCl electrolyte flow
rate is too fast. Remove the reference electrode from the measurement
cell.
Push the collar down and turn the collar less than 1/4 of a
turn to lock the collar. When the collar is locked, the collar
does not turn. If the collar is not locked, the KCl electrolyte
will flow too fast from the reference electrode into the
measurement cell.
The measurements are
not accurate. The analyzer is not
calibrated. Calibrate the analyzer. Refer to Do a calibration in the
operations manual. For the best accuracy, calibrate the
analyzer at 7-day intervals (weekly).
Auto reactivation is
disabled or the interval
between reactivations is
more than 24 hours. Start an auto reactivation. Push diag , then select
SENSOR REACTIVATION.
Note: For the best accuracy, set auto reactivation to on. Set the
interval to 24 hours. Refer to the operations manual.
The reactivation solution
bottle is empty. Replace the reactivation solution. Refer to Replace the
calibration and reactivation solutions on page 4.
There is a leak or
blockage in the
reactivation solution
tubing. Look for a blockage or leak in the tubing. Replace the
tubing as necessary.
The reactivation solution
pump does not operate
correctly. Push diag , then select PERFORM TEST > REACT SOL
DELIVERY > HIGH to set the reactivation solution pump
to a high flow rate. If reactivation solution does not flow to
the middle chamber of the measurement cell, replace the
reactivation solution pump.
The stir bar in the
overflow vessel does
not turn. The mixer does not
operate correctly.
Note: The stir bar turns
intermittently.
Push diag , then select PERFORM TEST > MIXER to set
the mixer motor to on. If the stir bar does not move,
replace the mixer motor.
The KCl electrolyte
consumption is too
fast
1
.
The collar on the glass
part of the reference
electrode is not locked. Remove the reference electrode.
Push the collar up. Push the collar down and turn the
collar less than 1/4 of a turn to lock the collar. Refer to the
illustrated steps in
Install the reference electrode in the
installation manual.
When the collar is locked, the collar does not turn. If the
collar is not locked, the KCl electrolyte will flow too fast
from the reference electrode into the measurement cell.
1
The KCl electrolyte consumption is too fast if the level of the reservoir decreases by more than
3 mm (1/8 in.) in two days
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