Rotary Positioner - R99E | OMC

OMC R99E – Electro-Pneumatic Positioner for Rotary Actuators

The OMC R99E is an analog electro-pneumatic positioner designed for single or double acting rotary pneumatic actuators. It accepts a 4–20 mA control signal from PLC, DCS, or controller. The device compares the input signal to the actuator shaft rotation using a force-balance mechanism. Output is a modulated pneumatic pressure to the actuator.

Technical Data

• Input signal: 4–20 mA
• Supply air pressure: 3–10 bar
• Pneumatic connections: 1/4" NPT
• Output pressure: 0–100% of supply pressure
• Operating angles: 0–90° / 0–60° standard; 0–20°, 0–180°, 0–270°, 0–360° on request
• Repeatability: ±0.2% F.S.
• Hysteresis: ±1% F.S.
• Ambient temperature: -40 to +70 °C (see datasheet)
• Enclosure: IP55, optional IP65
• Electrical connection: PG9, others on request
• Impedance: <250 Ω
• Body: cast aluminum with anti-corrosive coating

Adjustment Functions

R99E 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, suitable for large-volume actuators or applications requiring defined open/close times.

Applications

Suitable for rotary control valves, butterfly, ball, and plug valves in:

• Steam, hot water, condensate
• Cooling water, HVAC circuits
• Instrument air, process utility networks
• Analog flow control, bypass, mixing, or diverting duties

Variants and Options

Available with 4–20 mA position transmitter, limit switches, pressure gauges, and aluminum cover. ATEX version 2014/34/EU, II 1G Ex ia IIC Ga T6/T5 Ga for hazardous areas.

FAQ

When to select R99E vs R99P?
The R99E is used when the control signal is 4–20 mA. The R99P is for pneumatic signals 3–15 psi / 0.2–1 bar.

What should be checked before selection?
Rotation angle, single/double acting actuator, air supply pressure, ATEX requirements, response time, need for limit switches or 4–20 mA feedback.