AMI Codes-II TC
Troubleshooting
A-96.250.631 / 280219
65
7.
Troubleshooting
This chapter provides some hints to make troubleshooting easier.
For any detailed information how to handle or clean parts please
see
. For any detailed information how to pro-
gram the instrument please see
Program List and Explanations, p.
.
7.1.
General Instructions
NOTICE:
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.
Diagnostic
values
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.
Frequently
asked
questions
Problem
Possible Reasons
Unstable values
Sample taken too close to feeding line
Sample flow too irregular or too low
Codes display
higher or lower than
manual measure-
ment
Wrong manual measurement or old
chemicals have been used. Repeat the
verification.
Reagents of AMI Codes mixed wrongly or
not completely
Sample flow alarm,
but there is sample
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 fluctua-
tion.
Check for regular air bubble pattern.
