Marine Mechanical Swichgages

The 20T-250-12-1/2 is a 2″ Temperature Swichgage. This very popular design features a diaphragm-actuated, temperature-indicating gauge, with a built-in electrical switch for tripping alarms and/or shutdown devices. This model has a 12 foot capillary length with a standard 1/2-14 NPT threading, and a temperature range from 130-250˚F (54-121˚C).

The gauge mechanism is enclosed in a steel case coated to resist corrosion. A polycarbonate, break-resistant lens and a polished, stainless steel bezel help protect this rugged, built-to-last instrument. This vapour actuated gauge features a sealed capillary tube and a sensing bulb. When subjected to heat, the liquid in the sensing bulb changes to vapour creating pressure against the diaphragm mechanism. The diaphragm translates this vapour pressure into a mechanical gauge reading.