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What is the filtration accuracy of an FH series hydraulic line filter with #150 mesh?

The “mesh” indicates the number of openings in 1 inch.
The higher the number, the finer the filtration accuracy.
The adaptation with the nominal filtration rating of SMC elements is as follows: #100 mesh ― 149 μm, #150 mesh ― 105 μm, and #200 mesh ― 74 μm.

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://smccatalog.partbuilder.smcpneumatics.com/support/faq/en-jp/?ca_id=hydraulic-filters&fa_id=10620

SMC VPW2155-065T-FH valve media 3/4 pt 24vdc, VP*/VT* 2/3-WAY MEDIA VALVE

This is a legacy product. Please contact us for the latest version.sales@ocaire.com

https://www.smcpneumatics.com/VPW2155-065T-FH.html

What are the possible causes of the red ring in the differential pressure indicator window of an FH series hydraulic filter floating each time the cylinder operates, even after the element has been replaced? Also, what can be done to remedy this?

A large differential pressure may have been generated momentarily during cylinder operation.
Factors that cause a large differential pressure include changes in speed and an increase in hydraulic oil viscosity due to changes in temperature (in winter), which may also cause aging of the pump. Check the situation and contact SMC if you require further assistance.

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://smccatalog.partbuilder.smcpneumatics.com/support/faq/en-jp/?ca_id=hydraulic-filters&fa_id=10615