Maintenance and Troubleshooting
5-3
To change the flow calibration, the internally stored calibration set
point must be changed. A computer running a terminal emulation
program as described in Chapter 4 must be connected to the
UWCPC. Entering the command SFS (Set Flow Set Point) will echo
the current set point value to the terminal screen. The flow set point
value can be changed by entering a new value using the same
command followed by a comma and the value. Increasing the set
point value will increase the flow. Changes to the value of 10 or more
may be necessary to see changes in the flow meter reading
depending on its sensitivity. The sheath flow calibration set point
value can be queried and changed in a like manner using the SHS
(Set sHeath Set point) command.
For example:
Command
Response
SFS
1250
UWCPC returns current flow set point
value.
SFS,1260
OK
UWCPC accepts new set point and
increases flow rate.
SFS
1260
UWCPC returns new flow set point.
The set point value should be adjusted until a flow meter reading of
0.6 L/min is obtained.
T r o u b l e s h o o t i n g
This section provides information on troubleshooting the following:
•
Water in the sample inlet.
•
Little or no water flows during drain cycle.
•
Water spurts out of pump exhaust.
•
High or low photometric readings.
•
Rapidly flashing status indicator—laser.
