Hach NA5600 sc Na+ Maintenance And Troubleshooting Manual page 19

Problem
"CALIBRATION FAIL"
warning occurs.
"REACT VOLTAGE
LOW" warning occurs.
Possible cause
The value of the
calibration solution in the
auto calibration settings is
different from the value on
the calibration solution
bottle.
The calibration solution
bottle is empty.
There is a leak or
blockage in the calibration
solution tubing.
The calibration solution
pump does not operate
correctly.
The stir bar does not turn.
Note: The stir bar turns
intermittently.
The stir bar is not in the
overflow vessel.
The reactivation solution
bottle is empty.
The sodium electrode
does not operate correctly.
The reference electrode
does not operate correctly.
There is a leak or
blockage in the
reactivation solution
tubing.
The reactivation solution
pump does not operate
correctly.
Change the calibration solution value in the calibration
menu to the value on the calibration solution bottle. Refer
to Set the auto calibration settings in the operations
manual.
Replace the calibration solution. Refer to
calibration and reactivation solutions
Look for a blockage or leak in the tubing. Replace the
tubing as necessary.
Push diag, then select PERFORM TEST > SAMPLE
DRAIN to fully drain the overflow vessel.
Push diag, then select PERFORM TEST > CAL STD
DELIVERY to set the calibration solution pump to on. If
calibration solution does not flow to the overflow vessel,
replace the calibration 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.
Make sure that the stir bar is in the overflow vessel.
Make sure that the end of the reactivation solution tube is
at the bottom of the bottle.
Replace the reactivation solution. Refer to
calibration and reactivation solutions
• Make sure that the sodium electrode is installed
correctly. Refer to the installation manual.
• Make sure that there is no air in the glass bulb of the
sodium electrode.
• Remove the reference electrode from the measurement
cell. Lift the collar that is on the glass part to let some
KCl electrolyte flow out. 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. Install the
reference electrode in the measurement cell.
• Make sure that the reference electrode is installed
correctly. Refer to the installation manual.
• To identify if the problem is fixed, push diag, then
select SENSOR REACTIVATION to do a reactivation.
Look for a blockage or leak in the tubing. Replace 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.
Solution
Replace the
on page 4.
Replace the
on page 4.
English 19