Linear Positioner - RE01 | OMC

OMC RE01 – Linear Electro-Pneumatic Positioner

The OMC RE01 is an analog electro-pneumatic positioner designed for linear control valves. It accepts a 4–20 mA input signal, compares the control signal with mechanical position feedback, and modulates pneumatic pressure to the actuator to ensure valve stroke follows the controller setpoint. The positioner compensates for differential pressure changes, stem friction, and actuator diaphragm hysteresis, maintaining accurate valve positioning in process control loops.

Technical Data

• Input signal: 4–20 mA
• Instrument air supply: 2–10 bar
• Pneumatic connection: 1/4" NPT
• Output air: 0–100% of supply pressure
• Nominal stroke: 3–7, 6–18, 9–33, 14–53, 53–100 mm; custom strokes available
• Ambient temperature: -40 to +70 °C
• Ingress protection: IP55, optional IP65 (EN 60529)
• Repeatability: ≤0.2% F.S.
• Hysteresis: ≤1% F.S.
• Electrical entry: PG9; other options on request

Adjustment Functions

RE01 provides independent zero/span adjustment, split-range capability, action reversal, and valve speed control. Air supply is adjustable from 1 to 34 Nm³/h depending on supply pressure, critical for large actuator response times.

Applications

Suitable for control valves in:

• Steam, condensate, and thermal networks
• Cooling water, hot water, and HVAC systems
• Instrument air and auxiliary industrial circuits
• Chemical processes requiring proportional flow or pressure control

Versions and Certifications

Mounting per IEC 60534 / IEC 534 NAMUR standards. Options include 4–20 mA position transmitter, limit switches, pressure gauges, and aluminum cover. RE01.1 ATEX 2014/34/EU, II 1G Ex ia IIC Ga T6/T5 Ga version available for hazardous areas.

FAQ

When to select RE01 over pneumatic RP01?
Use RE01 when the control loop provides a 4–20 mA electrical signal instead of a 3–15 psi pneumatic signal.

What should be checked before selection?
Valve stroke, available air supply, actuator type, ATEX requirements, response time, and need for position feedback.