What does it mean if my TSI Instruments Measuring Instruments displays a FLOW BLOCKED message?
J
Jimmy StewartAug 26, 2025
A FLOW BLOCKED message indicates that the inlet or outlet flow is obstructed, or the internal screen filter is plugged:
* Check for and remove any obstructions from the inlet flow and ensure the sample tube isn't pinched. Verify correct installation of the impactor inlet, if one is used.
* Remove any obstructions from the outlet flow fitting.
* The internal screen filter may be plugged, requiring factory servicing or replacement.
M
Michael HoltAug 23, 2025
Why does my TSI Instruments Measuring Instruments show an erratic zero reading?
A
Antonio MorganAug 25, 2025
An erratic zero reading can be caused by several factors:
* A leak: Check all connections and tighten sample inlet screws carefully. If using an impactor, clean and re-oil the impactor disc, ensuring the O-ring is in place and the disc is seated correctly.
* A dirty inlet or sample tube: Clean the inlet and either clean or replace the tubing.
* Extreme temperature swings: Zero the instrument at ambient temperature before starting and protect it from temperature fluctuations.
* Contamination of the internal optics chamber: The unit may need to be returned to the factory for cleaning and servicing.
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