Metrohm 930 Compact IC Flex Oven/SeS/Deg User Manual download pdf (Page 101)

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6 Troubleshooting

930 Compact IC Flex Oven/SeS/Deg (2.930.2460)

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Problem Cause Remedy

Extreme spread of

the peaks in the

chromatogram.

Splitting (dual

peaks)

Capillary connections –

dead volume in the system.

Check the capillary connections (see Chapter

3.2, page 13) (use PEEK capillaries with an

inner diameter of 0.25 mm between the injec-

tion valve and detector).

Guard column – Dimin-

ished efficiency.

￭ Replace the guard column (see Chapter

3.19, page 46).

Separation column – Dead

volume at the column

head.

￭ Install the separation column in the oppo-

site flow direction (if permitted by the leaf-

let) and rinse into a beaker.

￭ Replace the separation column (see "Con-

necting the separation column", page 50).

Precision problems -

the measured values

are highly scattered.

Injection valve – Sample

loop.

Inspect the installation of the sample loop (see

"Optional: Exchanging the sample loop",

page 26).

Sample – There are gas

bubbles in the sample.

Use the sample degasser .

Sample – The rinsing vol-

ume is too small.

Increase the rinsing time (see Chapter 5.15,

page 86).

Injection valve – Defective. Request Metrohm Service.

MCS – The vacuum is too

low.

￭ Check the connectors. If they are OK:

￭ Contact Metrohm Service.

Vacuum is not being

built

Eluent degasser – Vacuum

connection on the rear of

the instrument is not

(tightly) sealed.

￭ Seal the Vacuum connector tightly with a

threaded stopper (6.1446.040).

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Metrohm 930 Compact IC Flex Oven/SeS/Deg User Manual Page 101

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