Indicator

It is mainly used for oil line filter. When the element is blocked up in hydraulic system, the differential pressure is caused by the resistance between the in-let and out-let port. When the different pressure is up to rated valve, it will be is combined electric indicator with a visible indicator.

If the electric part happens fault for un-indicating, the visible indicator will be signalledWhen the element is blocked up, the differential pressure is up to rated value. They will be signalled for cleaning or exchanging the element.