The Bristol Series 5457-70G Remote Electronic Setpoint Transmitter is designed for performance and durability while providing cost-effective operation due to very low air consumption. This transmitter is explosion-proof (Class 1, Division 1) and can be adjusted  by either discrete or analog inputs from remote locations and/or from a computer.  This unit is not a controller, but effectively transmits a 3-15 psi signal to another device such as a 5453 or 5457 controller.