Linear Smart Positioner - YT3300L | OMC

OMC YT3300L – Smart Positioner for Linear Valves

The YT3300L is a digital electro-pneumatic positioner designed for linear pneumatic actuators. It accepts a 4–20 mA DC input signal and modulates output air pressure to the actuator, ensuring valve travel matches the controller setpoint. Product documentation lists it as single-acting, but the series manual specifies both single and double acting configurations depending on model selection.

Technical Data

• Input: 4–20 mA DC
• Minimum current: 3.2 mA, or 3.8 mA with HART
• Supply pressure: 1.4–7 bar
• Air connection: 1/4" NPT
• Electrical entry: PF 1/2 / G1/2
• Enclosure: IP66, EN 60529
• Linearity: ±0.5% F.S.
• Hysteresis: ±0.5% F.S.
• Repeatability: ±0.3% F.S.
• Air capacity: 70 L/min at 1.4 bar
• Air consumption: 2 L/min at 1.4 bar
• Housing: aluminum, corrosion-resistant coating
• Certification: II 2 G D Ex ia IIC T5/T6, ATEX 2014/34/EU

Valve Stroke Range

Technical datasheet specifies stroke 20–150 mm for YT3300L/YT3350L; the series manual lists 10–150 mm for YT-3300L. Confirm final code, lever type, and actual actuator stroke during selection.

Control Functions

Supports auto calibration, PID tuning, alarms, HART, analog feedback 4–20 mA, characteristic curves linear / quick open / equal percentage, and custom 16-point curve. A/M switch available for bypass, and variable orifice for hunting reduction on small-volume actuators.

Applications

Used on control valves for steam, condensate, hot water, chilled water, instrument air, and auxiliary process circuits. Suitable for flow, pressure, or temperature control loops in heat exchangers, bypass lines, and manifolds.

FAQ

What should be checked before selection?
Stroke, actuator fail action, air supply pressure, Ex zone, HART requirement, feedback or limit switches.

Does it affect valve tightness?
The positioner controls actuator position and force. Tightness depends on seat/plug design, packing, Δp, and valve maintenance condition.