The Convectron® ATM Transducer combines control electronics with a piezo-resistive diaphragm sensor and the proven Convectron sensor to provide a continuous measurement from low vacuum to atmosphere. The compact design is easy to install and operate and includes a set point relay activation at a defined differential pressure from atmosphere. The Convectron ATM Transducer eliminates the need for two sensors in those applications that require low pressure measurement and an accurate indication of differential pressure at atmosphere, such as vacuum system loadlocks.
The Series 385 Convectron Module contains a piezoresitive diaphragm gauge which has silicone and epoxy seals that can be susceptible to permeation by helium gas. If a helium leak detector is used, it will register helium due to the permeation of the gas through these seals. When the module is saturated with helium, this permeation can contribute to base pressure readings below 10-7 Torr. For other common gases, including air, the leak rate is not measureable on a common leak detector.