Level Glass for Refrigerant Low Temp Measurement


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Please I need to see refrigerant Propane C3 liquid level in a scrubber inlet to a refrigerant compressor. The Problem the temp. of this Ref. is very low, near -20C. There is no level indicated in the existing level glass as it is not thermally insulated, so C3 direct evaporate due to environment temp touching the level glass. we cannot insulate the glass as how we will see the level if we insulate the glass?