Download AVL OMNI 1-9

9 Troubleshooting
FMS Volume error +
additional information
(tn)
If an FMS volume error is signaled, the cause of the error can be detected with
the aid of the automatic test procedure.
Scenario 1:
Troubleshooting comprises several individual diagnostic cycles which can
activated under "System - Util - Troubleshooting - FMS Volume Error".
During the diagnostics of the FMS volume error, the following components are
tested by the main control:
•
aspiration path FMS - sample distributor
•
FMS ventilation
•
BG measuring chamber
•
Converting line
• PP cartridge valve 17
More detailed information on possible causes and remedies can be displayed
upon completion of the test procedure by pressing the "More Details" key.
Follow the instructions on the screen!
The FMS time (tn) (see also page 9-109) indicated with an FMS volume error
provides information on the cause of the error.
Before each calibration of the FMS, solution B is aspirated and the time until
the sample closes the contact path in the BG measuring chamber is measured.
From this time the FMS time (tn) is calculated.
If this time is too long or too short a FMS volume error occurs.
Possible causes for a tn < -0.30 (sample enters measuring chamber too soon):
•
peristaltic pump too fast
•
Air tubing at V19 is blocked.
•
fluid volume is changed by valve malfunction (e.g. V3)
•
Tubings used in the FMS path are not original. (i.e. of wrong dimensions)
Possible causes for a tn > 1.70 (sample enters measuring chamber too late):
•
peristaltic pump too slow
•
leakage or clog
•
Rinse solution (Solution A) used instead of Solution B
If the error cannot be located with the aid of the automatic test procedure,
please continue with the steps described below.
The following scenarios are built up logically and are to be performed
successively until the error source has been identified.
Service Manual, AVL OMNI, Rev. 9.0, May 2000
9-7