GE AKTA avant User Manual page 255

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Table of Contents

Possible causes of a failed test

The table below describes possible causes of a failed test. When possible sources of error

have been checked and taken care of, run the test once again.

Disturbances caused by

air trapped in Quater-

nary valve or any of the

System pumps

Disturbances caused by

damaged pump piston

Unstable or incorrect UV

signal, or drifting base

line - faulty UV monitor

Wrong mixer chamber

size or faulty mixer

Faulty Quaternary valve

Faulty System pumps

Incorrect preparation of

buffer and tubing

ÄKTA avant User Manual 29035184 AE

Make sure to prime all Q inlets and purge the System

pumps before method start, see Section 5.4.3 Prime Q in-

lets, on page 178.

Replace piston seals. See ÄKTA avant Operating

Instructions, Maintenance chapter.

See UV monitor U9-M and UV detector unit, on page 363

Change mixer chamber or replace the Mixer. See Sec-

tion 7.8.2 Replace the Mixer, on page 338.

See Quaternary valve, on page 383

See Section 8.6 Troubleshooting: Pumps, on page 397

Make sure that the system was correctly prepared, see

Prepare the Q valve test, on page 253.

6 Performance tests

6.5 Quaternary valve test

Troubleshooting