The content of refrigerant in the line of the system;
The content of water in the refrigerant;
Indicates the oil level of compressor crooked.
SG-series have indicator paper whose color changes can indicate the content of water in the refrigerant;
The glasses and the "O" ring can make sure there is no leak of the refrigerant;
Max. Working Pressure: 35bar (500psig);
The temperature of the medium: -50 +110;
The content of water is low, the color will change blue while high it will change pink which shows that filter dryer in the system needs to be changed.
SG-series sight glass(moisture indicator) is a kind of element which shows the moistur and the flow of refrigerant.