The YT-3303L is a digital electro-pneumatic positioner for linear control valves equipped with pneumatic actuators, supporting both single and double acting configurations. It accepts a 4–20 mA DC input from PLC, DCS, or controller, converting the signal into pneumatic pressure to modulate actuator position and valve stroke. Features include auto calibration, PID control, alarm functions, and HART protocol support.
YT-3303L is available in Non-Explosion and Ex ia IIC T6/T5 certified versions. Options include HART, position transmitter (PTM), local control via 4 keys, LCD, A/M switch, and limit switches. Lever kits cover strokes of 10–40, 20–70, 50–100, and 100–150 mm.
Supports linear, equal percentage, quick open and custom 16-point characterization. PID tuning and auto calibration are used for loop stability under varying Δp, stem friction, or actuator hysteresis.
Suitable for steam, condensate, hot water, chilled water, instrument air, and auxiliary process networks. Used in heat exchangers, bypass lines, manifolds, and control loops for flow, pressure, or temperature regulation.
What should be checked before selection?
Valve stroke, actuator type, available air supply, PT/NPT connection, HART requirement, feedback, and Ex classification.
Does seat tightness depend on the positioner?
The positioner affects actuator position and force. Final seat tightness depends on seat/plug design, packing, Δp, and valve maintenance condition.
YT-3303L Smart Valve Positioner accurately controls valve stroke, according to input signal of 4-20mA, which is being input from the controller. In addition, built-in micro-processing operator optimizes the positioner's performance and provides unique functions such as Auto calibration, PID control, Alarm, and Hart protocol.
Accessories & Compatibility
