TERRANOVA® is a group gathering the oldest and most historical Italian Brands of Process Instrumentation: Spriano® (1923), Valcom® (1974) and Mec-Rela® (1976).

Head Office
Via Rosso Medardo 16, 20159 Milano, Italy
Operative Office
Via Gramsci 1, 26827 Terranova dei Passerini (LO), Italy

Tel. +39 0377 911066
Fax +39 0377 919156


Join our Newsletter


    This type of indicators display the level of the fluid through a transparent surface, being part of a column that is connected to the vessel by on-off cock gauges. They are composed of one or more opposed pairs from smooth borosilicate glass (crystal) that are tightened inside a steel box.

    Categories: , Tags: ,



    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.

    Additional information

    Application Cases


    Measuring Range

    Process Connection

    Process Temperature

    Accuracy Class