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Fisher 3661 electro-pneumatic single-acting positioners are used with various actuators on sliding-stem valves for throttling applications. These rugged positioners provide a valve position proportional to a pneumatic input or a standard millampere DC input signal received from a control device.

• Manufacturer: Fisher
• Valve Type: Positioners
• Sub-Type: Fisher Positioners
• Positioner design provides accurate, fast-responding instruments able to withstand the vibrations of most plant environments. Low steady-state air consumption contributes to efficient operation.
• Easily adjustable gain and damping adjustments fine tune the positioner stability to specific application requirements.
• Positioner accepts a standard milliampere DC input signal from a control device. This positioner provides split range capabilities and adjustable zero and spans.
• Most of the parts for 3661 positioners are interchangeable; requiring fewer spare parts to support these positioners.
• The case and cover are designed to withstand mechanical vibration and rough handling.
• Zero and span adjustments can be made with the cover in place.