✔︎ R2 series is the standard low pressure level gauge designed for multiple applications under wide variety of pressure and temperature conditions. The structure of the gauge is simple compared with the other gauges, it is rather economical and no possibilities of trouble. It is necessary to take care of this model when it is used for corrosive liquid to glass. When used in chemical services, coating glass must be employed, and when used in steam services, the transparent type gauge is recommendable.

✔︎ R4 series is the standard medium pressure level gauge and the up-grade model of R2 series. To hold the pressure tight of the gauge, heavy tithing is required on the cover, which is therefore made of forged carbon steel with two ribs at it’s both ends not so as to deform by tightening stress.

✔︎ R6 series is the standard high pressure revel gauge for use of further more high pressure than the model of R4 series.

The gauge is built to fasten up a reflective glass, which is a long thick flat tempered glass with provided some grooves on one side of it, in between a gauge body and cover with bolts, facing the grooved side to liquid in the body. The gaseous part appears silvery white as the incident light is reflected on the grooves, while the liquid part appears black as the light goes into the liquid without reflection. Therefore, liquid level can be indicated distinctly even if the gauge is applicable for a clear transparent liquid.