These pneumatic regulators feature motor assemblies that are enclosed in an explosion-proof housing. In the event of power failure, the output pressure automatically locks in its last position. The 24CC and 24XC models have an AC control unit available with a continuous operation 115VAC motor. In the 24CS unit, the control assembly is a stepper motor with an integral translator board capable of converting 23-26VDC digital pulse inputs entered by the user into control logic. These models also have a feedback potentiometer option. For the 24XS model, the DC pulse input assembly is a clock generator and translator board for pulse inputs of 12-24VDC. The maximum and minimum pressure values can be selected by the user.