Troubleshooting
Problem
Possible cause
Solution
Clean sensor indicator
light is on.
The flow cell is contaminated or
stained.
Complete the cell cleaning procedure. Refer to
Clean the cell
on page 21.
Laser became weak.
Contact technical support to replace the laser.
The flow is stopped. Air bubbles can
cause a light beam blockage, which
causes a calibration to fail.
Make sure that the flow rate is at 100 mL/min
+/-10%.
Application has too much turbidity.
Install a small or large mesh filter to decrease
sample turbidity or find a different sampling
location.
Dangerous electrical incidents can
cause the instrument to be set back
to the default settings.
Make sure that software item #3 in the "load"
menu is set to 800 to 1200.
Instrument does not
communicate to the
computer.
Lightning or a power surge can blow
communications chips.
Connect directly to the PCX with
RS232 programming kit cable, disconnect from
RS485 network, cycle power and scan with
advanced CRTS.
RS485 converter or computer COM
port is not connected correctly.
If the instrument is the last one in the network
daisy chain, make sure that jp1 on the
interconnect card is shorted.
The instrument is disabled in the
vista location setup screen. If the
software identifies the instrument as
location 32, the instrument is set
back to default.
Make sure that the instrument is enabled in the
vista location setup screen.
Program the instrument completely on the high
level and on the low level again.
The instrument is locked up.
Unplug all instruments on the network, except
the defective instrument. Set the power to off
and then to on again and scan with the
software program again.
RS485 is not wired correctly in the
instrument or connectors are not
seated tightly.
Examine all wiring and connectors.
The drivers for the RS485 adapter
are not installed correctly.
Download and install the drivers for the
RS485 converter from the converter
manufacturer's website.
For Windows versions of 7 and
higher: VISTA is not installed in the
correct program files folder.
Uninstall the software and install the software
again. Make sure that the software is installed
in the folder "Program Files (x86)"
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