Model 8007 and 8008 electro-pneumatic transducers convert a low-power DC signal into a proportional pneumatic signal in the 207-to-1035 mbar (3-to-15 psi),or 414-to-2070 mbar (6-to-30psi) range, as appropriate.They are of the force balance type.

Generally speaking, a signal from the Model 8007 is used by a pneumatic positioner or a supply relay of the volume

booster type.

Model 8008 is fitted with a relay, which allows the transducer output signal to directly control a valve pneumatic actuator.

These transducers are either direct or reverse action. Action direction can be changed very easily, reversing the connections of the signal leads on the terminal board.These transducers can be installed in several positions without affecting their operation, and they are not sensitive to radio waves.

Method of Operation:

Any variation in the control input signal through the coil changes the gap between flapper and nozzle, causing a change in nozzle back pressure. This change in pressure counteracts beam movement until equilibrium is restored. Output pressure is the same as nozzle circuit pressure in Model 8007 transducers.With direct action, any increase in the input signal brings

about an increase in output air pressure. With reverse action, any increase in the input signal brings about a decrease in output air pressure