Hach NA5600 sc Na+ Maintenance Et Dépannage page 22

Problem
The KCl electrolyte
consumption is too
1
fast .
The KCl electrolyte
consumption is too
2
slow .
A relay indicator on
the measurement
screen is flashing.
4.1 Reset the overfeed timer for relays
The overfeed timer setting for the relays prevents a condition that keeps the measurement value
higher than the setpoint or deadband setting (e.g., damaged electrode or a process upset) from
keeping a relay switched on continuously. The overfeed timer limits how long the relays and their
connected control element stay on independent of the conditions.
When the select time interval for the overfeed timer expires, the relay status flashes on the top-right
corner of the measurement screen until the overfeed timer is reset. Push diag, then select
OVERFEED RESET to reset the overfeed timer.
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
2
The KCl electrolyte consumption is too slow if the level of the reservoir decreases less than
1 mm in two days
22 English
Possible cause
The collar on the glass
part of the reference
electrode is not locked.
The collar on the glass
part of the reference
electrode was not
turned to break the
seal.
The overfeed timer has
expired.
Solution
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.
Remove the reference electrode.
Carefully turn the collar to break the seal. When
the collar turns easily, the seal is broken. Refer to
the illustrated steps in Install the reference
electrode in the installation manual.
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.
Reset the overfeed timer. Refer to
overfeed timer for relays
Note: The overfeed timer setting is only enabled when the relay
SET FUNCTION setting is set to FEEDER CONTROL.
Reset the
on page 22.