MKS 252 Exhaust Valve Controller

The MKS Type 252E Exhaust Valve Controller controls a stepper motor powered exhaust valve (MKS Type 253) to maintain a constant pressure in a vacuum system by varying the pumping speed. The 252 controller can provide a ±15 VDC output and will accept pressure inputs from a variety of transducers. The front panel controls allow selection of the input range, control loop tuning, and automatic and manual valve control. An error meter is provided to assist you in tuning the control loop. External signals can be used to command the external set point and open or close the valve.