The 1249 Control Valve Driver provides the drive signal required to operate the MKS 148 and 248 Proportioning Solenoid Valves used for pressure or flow control. It is intended for use with PCs, PLCs, or other controllers that provide the necessary PID control functions, but which do not have the current output necessary to drive these valves. (Open-loop control of these valves, i.e. no PID control, is not recommended.) The 1249 can be powered by common power supplies of ±15 VDC or 24 VDC, consuming less than one Watt of power (not including the valve). It accepts control signal inputs of 0-5 VDC, 0-10 VDC, or 4-20 mA from a PC, PLC, or another system controller. The output signal of the 1249 is tailored to match the requirements of the 148 or 248 Proportioning Control Valve.