Hach NA5600 Manual De Instrucciones página 21

Problem
The instrument
readings are not
stable.
The measurements
are not accurate.
The stir bar in the
overflow vessel does
not turn.
Possible cause
The analyzer was
started less than
2 hours ago.
The electrode cable(s)
are cross-threaded on
the electrodes.
The electrode cables
are connected to the
wrong electrodes.
The KCl electrolyte flow
rate is too fast.
The analyzer is not
calibrated.
Auto reactivation is
disabled or the interval
between reactivations
is more than 24 hours.
The reactivation
solution bottle is empty.
There is a leak or
blockage in the
reactivation solution
tubing.
The reactivation
solution pump does not
operate correctly.
The mixer does not
operate correctly.
Note: The stir bar turns
intermittently.
Solution
Let the analyzer operate for 2 hours to become
stable.
Disconnect the cable from the electrode. Push the
connector fully down on the electrode connector,
then turn the connector until finger tight.
Connect the blue cable to the reference
electrode. Connect the black cable to the sodium
electrode.
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.
Calibrate the analyzer. Refer to Do a calibration in
the operations manual. For the best accuracy,
calibrate the analyzer at 7-day intervals (weekly).
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.
Replace the reactivation solution. Refer to
Replace the calibration and reactivation solutions
on page 4.
Look for a blockage or leak in the tubing. Replace
the tubing as necessary.
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.
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.
English 21