I/P Converter - PC18 | OMC

I/P Signal Converter OMC PC18

The OMC PC18 is a two-wire field-mounted electro-pneumatic converter designed to convert a DC electrical signal into a proportional pneumatic output up to 8 bar. It is intended for pneumatic actuators requiring higher control pressures, where standard 3–15 psi ranges are insufficient for process requirements.

Integration in Control Loops

The PC18 is installed between a PLC, DCS, or electronic controller and a pneumatic valve actuator. It is used in flow, pressure, temperature, or level control applications where the actuator requires a higher operating pressure than what PC13/PC15 models provide.

Technical Selection Data

• Input: 4–20 mA standard; 0–20 mA, 1–5 V, or 0–10 V available on request
• Output: 0–4 bar minimum range, 0–8 bar maximum range
• Supply air pressure: up to 9 bar
• Pneumatic connections: 1/8" NPT standard, 1/4" NPT optional
• Electrical connection: PG9 standard, PG13.5 optional, 2-wire terminal 0.5–1.5 mm²
• Enclosure: IP55 standard, IP65 optional
• Ambient temperature: -20 to +70 °C
• Linearity ≤2%, hysteresis ≤0.8%, repeatability ≤0.2%

Variants and Certifications

Standard version features a cast aluminum body with anti-corrosive coating and polycarbonate cover. The PC18.1 variant is certified for intrinsic safety ATEX II 1G Ex ia IIC T6/T5 Ga and must be powered via a certified circuit per EN 60079.

Installation and Maintenance

Mounts on 35 mm DIN rail. Vertical installation with electrical connection upwards minimizes zero drift. Instrument air must be clean and dry, with a filter-regulator (≤25 μm) upstream of the device.

FAQ

When is PC18 selected over PC15?
When the actuator requires a control signal in bar rather than low-range psi.

Is output range adjustable?
Yes. Span is set using a 20 mA input and monitoring output pressure with a gauge.