Hach 2200 PCX Manuel D'utilisation page 24

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