The MSS Servo Process Controllers are suitable for use in a wide range of industrial applications. They operate by comparing the demand signal set on the control panel with the value of a reply or feedback signal, which is obtained from the process being controlled. If two signals vary by more than a pre-set amount the controller will produce an output by energising a 'high' or a 'low' relay. The output may be used to drive a suitable actuator which in turn, will adjust the level of the process variable until the demand and feedback signals are equal.

With this type of control system, processes may be set to operate at desired values and be maintained there automatically.

The feedback transducer may be a variable resistor or any other device capable of producing a suitable electrical signal. A power supply suitable for operation from three phase mains with a reversing contactor assembly can also be supplied.

Applications include: Speed control via variable speed gearboxes, Valve position control, Automatic voltage control, Damper control, Out of limits detector, Positioning of hydraulic or pneumatic actuators, Control of temperature, pressure, level, speed, etc.

Internal trimming facilities are available as standard.

Features of the MSS8 Include:

• Input voltage or current scaling
• Deadband adjustment
• Upper and lower unit setting
• Offset control
• Transducer range matching
• Ration control of multiple systems

£228