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Bi-color water level gauges is designed for all types of pressure vessel and industrial steam boilers and steam locomotive boiler. It can indicate water level by showing red color in steam phase and green in liquid phase. 
1.Characteristic
-/- intuitive, reliable, large observation distance, clear.
-/-simple structure,easy to maintainance
-/- use is not influenced by the water quality, water clear interface.
-/-easy for sampling and washing with drain valve
2.Principle
Bicolor water level gauge is presented by using optical index of refraction and reflection characteristics in different media, and with the help of a color filter so that the liquid phase is green, the gas phase is red color. The gas-liquid interface is very clear.
3.Instruction
(1) Before use the gauge should be preheated 20-30 minutes in advance. Then open the valves at both ends to inlet medium after the glass plate is heated.
(2) To avoid flase water level we should drain timely to preven sewage blocking channels.