Elliptical gear flow meter

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Another beginner is asking a question. An elliptical gear flow meter is a (volumetric) type of flow meter, particularly suitable for measuring the flow rate of (high-viscosity) liquids. His perception of the annual changes in the liquid on the north side (unclear). The measurement accuracy can reach ±0.2%. Our factory has a workshop where, recently, there has been a need to measure a viscous substance used in the production of vitamins (or intermediates). At room temperature, this substance often crystallizes and blocks the flow meters; we have had to clean them around three times in one month. Generally, when in use, a higher temperature indicates that it is a fluid. How can the material inside be removed in a timely manner? What methods can be used to prevent the flow meter from getting clogged? My way of expressing this might not be very good. If there’s a way, could you teach it to me? :lol