Granville-Phillips 270006 THERMOCOUPLE GAUGE Used

描述：

These Granville Phillips thermocouple gauge tubes are designed for 260, 270, 280, 307 controllers. These thermocouple tube sensors have standard 1/8 inch male NPT vacuum fitting and Granville Phillips part number 270006. They''re the same as DV-6M or DV-6R with 1/8 NPT fitting.

Thermocouple sensors (thermal conductivity gauges) rely on the fact that the ability of a gas to conduct heat decreases with pressure. In this type of gauge, a wire filament is heated by running current through it. A thermocouple or Resistance Temperature Detector (RTD) can then be used to measure the temperature of the filament. This temperature is dependent on the rate at which the filament loses heat to the surrounding gas, and therefore on the thermal conductivity. A common variant is the Pirani gauge which uses a single platinum filament as both the heated element and RTD. These gauges are accurate from 10 Torr to 10−3 Torr, but they are sensitive to the chemical composition of the gases being measured (from Wikipedia.org).