Fisher 3660 pneumatic and 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.
Accurate, Efficient, Vibration-Resistant
Operation—Positioner design provides accurate,
fast-responding instruments able to withstand the
vibrations of most plant environments. Low
steady-state air consumption contributes to
Variable Gain—Easily adjustable gain and damping adjustments fine tune the positioner stability to specific application requirements.
Versatility—Positioner accepts a standard
pneumatic input signal (3660) or a standard
milliampere DC input signal (3661) from a control
device. This positioner provides split range
capabilities and adjustable zero and spans.
Rugged Construction—The case and cover are
designed to withstand mechanical vibration and
Easy Positioner Adjustments—Zero and span
adjustments can be made with the cover in place.