6 x 2.25 x 2.12in/150 x 57 x 54mm Flanged Sighting Tube
Sighting tubes are made from metal or refractory materials and are either open ended (Type STO) or closed (Type STC).
Type STO tubes are used when viewing a solid target through flame, smoke, fumes etc. The closed end of the type STC tube is used as the target. A thermometer used with an STC tube can replace a sheathed thermocouple.
To attach the sighting tubes to a mounting plate a steel adapter (Type STA) is cemented into refractory
sighting tubes.
Replacement Sighting Tubes can be purchased without the STA adapter fitted. Contact Land for details.
