The Model 40 pneumatic indicating controller from AMETEK PMT Products is designed to sense pressure and transmit an air signal that is precisely proportional to the measured variable. The output signal from its transmitter can be fed to a valve positioner or another remotely located final-control device. The Model 40 offers the safety of a fully pneumatic device while reducing both operating cost and environmental impact, limiting fugitive emissions when operating on natural gas. In addition, the device provides for the operation of a single low-bleed controller with a high-capacity relay that will provide process indication even in the event of a loss of power or air supply. The Model 40 can operate for extended periods in inaccessible locales without attention and has a wide selection of process–measuring elements available for pressure, differential pressure, flow, and level. Its accuracy is within ±1% of full scale of indication, and ±0.5% is available on most ranges. As a receiving controller, it can control any process variable transmitted as a pneumatic signal. Its transmitters are designed in appearance to match the indicating pneumatic controller. The transmitters measure many different variables and provide standard 3- to 15-psi output, 100% linear to the process-measurement range.
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