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Check the 310 II probe filter

Inspect and replace the specified particle filter.

testo 310 II

Applies to: testo 310 II probe shown in the illustration.

Before you start: Stop sampling and let the probe cool. The chamber may hold condensate.

Inspect the chamber

Check the filter through its window.

Transparent filter chamber on the testo 310 II flue gas probe, with the manual arrow showing an anticlockwise opening turn.
Filter chamber and opening direction. Testo manual, page 64 ↗ · Select image to enlarge.

Replace a dirty filter

Turn gently anticlockwise to open; fit the specified 0554 0040 filter.

Close the chamber

Turn clockwise to lock it before returning to the operating instructions.

If the issue continues: If flow remains weak, include the probe in your QRM service request and describe the checks completed.

Still need help with your device?

Include the model, serial number, exact error and checks already completed.

Start a service request

Source and applicability

testo 310 II - Flue gas analyser (0632 3104, 0632 3106): Instruction manual — §10.8, p. 64. 0970 3102 en 08 - 06.2025

Open the complete Testo operating manual ↗ · Find this model in the manual list

QRM wording summarizes the checks. Diagram excerpts © Testo SE & Co. KGaA. Follow the complete manual and warnings for your instrument. Source checked 7 September 2026.