TRANSPARENT LEVEL INDICATOR
The level reading is based on a different transparency of the fluid and the gas or vapor. In heavy-duty applications, the glass is protected by means of a mica shield, which however reduces the reading transparency. To remedy this phenomenon, special illuminators are used which exploit the total refraction / reflection effect in the fluid / gas or vapor separation surface. Reflection indicators are successfully used up to 250 bars and with temperatures up to 538° C.