GE Monitor UPC-900 Operating Instructions Manual page 100

7 Troubleshooting
7.1 Fault actions
Conductivity measurement
Component Problem
Conductivity Incorrect or unstable
measurement reading
Baseline drift or noisy sig-
nal
Conductivity measure-
ment with the same
buffer appears over time
100
Corrective action
Check that the conductivity flow cell cable is con-
•
nected properly to the reading rear of the module.
Check that the pump operates correctly.
•
If temperature compensation is being used, check
•
that the temperature sensor is calibrated, and that
the correct temperature compensation factor is in
use.
Check that the column is equilibrated. If necessary,
•
clean the column.
Check the operation of the mixer.
•
There may be air in the flow cell. Use a flow restric-
•
tor after the flow cell and check that the flow restric-
tor gives a back-pressure of 0.2 MPa.
Check for leaking tubing connections.
•
Check that the column is equilibrated. If necessary,
•
clean the column.
Check the operation of the mixer and the pump.
•
Clean the flow cell according to the procedure in
•
Section 6.3.2 Clean UV flow cell, on page 86.
Clean the flow cell according to the procedure in
•
Section 6.3.2 Clean UV flow cell, on page 86.
The ambient temperature may have changed. Use
•
a temperature compensation factor, see Setup
conductivity temperature compensation, on page72.
Monitor UPC-900 Operating Instructions 29-0567-16 AB