Model 40 Pneumatic Indicating Controllers meet QUAD "O" standards' requirement of an exhaust rate not to exceed 6.0 scfh. Models also comply with EPA's "Go Green" Initiative under the new Clean Air Act Standards.
They sense pressure and transmit an air signal precisely proportional to measured variable. Output signal from its transmitter can be fed to a valve positioner or other remotely located final control device.
Model 40 offers safety of a fully pneumatic device while it reduces both operating cost and environmental impact. It limits fugitive emissions when operating on natural gas.