Hach NA5600 sc Na+ Maintenance Et Dépannage page 18

Problem
A channel is not
being measured.
"UNSTABLE
READING" warning
occurs.
"SAMPLE MISSING"
warning occurs.
18 English
Possible cause
The channel is not
activated.
The channel is not in
the channel
measurement
sequence.
The rinsing time
between channel
measurements is too
short.
The shut-off valve on
the sample line is
closed.
The sample line is not
plumbed correctly.
The sample flow valve
is closed.
The solenoid valve for
the channel does not
operate correctly.
Solution
Push menu, then select SETUP SYSTEM >
CONFIGURE ANALYZER > CONFIGURE
SEQUENCER > ACTIVATE CHANNELS. Add the
channel. Push the LEFT arrow to select or
unselect a checkbox.
Push menu, then select SETUP SYSTEM >
CONFIGURE ANALYZER > CONFIGURE
SEQUENCER > SEQUENCE CHANNELS.
Push the UP and DOWN arrows to select a row,
then push the LEFT or RIGHT arrow to select a
channel. S1 is the first channel measured
followed by S2, S3 and S4.
Note: Do not select channels that contain the symbol "~" (e.g., 4-
~SAMPLE4). Channels that contain the symbol "~" are not
measured.
Push menu, then select SETUP SYSTEM >
CONFIGURE ANALYZER > MEASUREMENT >
SET MEASURE CYCLE > MAX CYCLE TIME or
CYCLE TIME. Increase the MAX CYCLE TIME or
CYCLE TIME setting to increase the rinsing time.
Turn the shut-off valve to open.
Make sure that the sample line is connected to
the correct plumbing port. Refer to Plumbing ports
in the installation manual.
Start the startup wizard. Push menu, then select
SETUP SYSTEM > STARTUP ANALYZER.
Push enter until prompted to adjust the sample
flow rate. Turn the sample flow valve counter-
clockwise to increase the flow rate to 6–9 L/hour
on each channel.
Push diag, then select PERFORM TEST >
SAMPLE DRAIN to drain the overflow vessel.
Push diag, then select PERFORM TEST >
SAMPLE DELIVERY to open the sample valve. If
sample does not flow into the overflow vessel,
examine the sample valve wiring. Replace the
sample valve if necessary.