Hach NA5600 sc Na+ Maintenance Et Dépannage page 19

Problem
"PH TOO LOW"
warning occurs.
"CALIBRATION
FAIL" warning
occurs.
Possible cause
The cover was
removed from the right
chamber of the
measurement cell.
The conditioning
solution bottle is less
than 10% full or empty.
There is an air leak in
the conditioning bottle
cap.
There is an air leak in
the conditioning tubing.
The conditioning valve
does not operate
correctly.
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.
Solution
Install the cover on the right chamber of the
measurement cell.
Replace the conditioning solution. Refer to
Replace the conditioning solution
• Make sure that the conditioning bottle cap is on
tight.
• Examine the washer in the bottle cap. If wear
or damage is seen, replace the washer.
• Examine the plastic flange on the rim of the
bottle. If wear or damage is seen, replace the
conditioning solution bottle.
Look for a blockage or air leak in the conditioning
tubing. Replace tubing as necessary.
Note: The conditioning tubing contains gas, not solution.
Push diag, then select PERFORM TEST >
CONDITIONING VALVE to open the conditioning
valve. If conditioning gas does not flow into the
right chamber of the measurement cell (seen as
bubbles), replace the conditioning valve.
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
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 >
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.
on page 6.
Replace
English 19