Swan Analytical Instruments AMI Codes-II CC Operator's Manual page 69

AMI Codes-II CC
Troubleshooting
7.
7.1.
Diagnostic
values
Frequently
asked
questions
A-96.250.581 / 181120
Troubleshooting
This chapter provides some hints to make troubleshooting easier.
For any detailed information how to handle or clean parts please see
Maintenance, p. 47. For any detailed information how to program the
instrument please see
General Instructions
Note: The sample for the manual measurement (with DPD) must
be taken directly from the flow cell.
If you need further help please contact your dealer. Note serial
number of instrument and all diagnostic values before doing so.
Zero photometry: 10'000–16'000 Hz (mostly near 16 000 Hz)
Slope photometry: 0.8–1.2
pH offset: new pH sensor: near 0, old pH sensor >  50 mV
pH slope: typically: 55–62 mV/pH unit.
Problem
Unstable values
Codes display
higher or lower than
manual measure-
ment
Sample flow alarm,
but there is sample
Program List and Explanations, p.
Possible Reasons
 Sample taken too close to feeding line
 Sample flow too irregular or too low
 Wrong manual measurement or old chemi-
cals have been used. Repeat the verifica-
tion.
 Reagents of AMI Codes mixed wrongly or
not completely
 Check sample flow at photometer outlet.
It must be at least 100 ml/min. For that
place the photometer outlet tube into a
measuring cup for 1 minute.
 Check sample line for pressure fluctuation.
 Check for regular air bubble pattern.
 Check flow alarm values in menu
p. 97)
84.
5.3.1.3,
69