GEMS RotorFlow RFO Type Electronic Flow Sensor – 1/2″ NPT, 10′ Cable- 155481

The GEMS RotorFlow RFO Flow Sensor (Part #155481) delivers reliable flow detection with high visibility and precise pulse output. Its compact, panel-mount polypropylene body houses a transparent rotor chamber for visual confirmation, while solid-state electronics provide accurate pulsed flow signals.

Engineered for performance, the RFO operates over a 4–20 GPM range (standard), with a low-flow option (1.5–12 GPM) and a ±7% accuracy at low flow. Rated for up to 100 psi and temperatures −20 °F to 180 °F, it's corrosion-resistant and ideal for harsh environments. Compatible with 4.5–24 VDC power supplies, it outputs a pulsed signal suitable for flow controllers or PLC integration.

Widely used in water treatment, chemical metering, HVAC, and industrial process systems, the RFO provides dependable and visually confirmed flow monitoring.

Key Features

• Visual rotor chamber for easy flow verification

• Pulsed VDC output (4.5–24 V DC input) for accurate flow measurement

• Flow range: 4–20 GPM standard; low-flow version 1.5–12 GPM

• Port size: ½″ female NPT

• Body material: Polypropylene, chemically resistant

• Operating pressure: up to 100 psi

• Temperature: −20 °F to 180 °F

• Cable: 10 ft (3 m), 22 AWG, 3-conductor PVC

• Accuracy: ±15% standard; ±7% low-flow

• Ideal for rotary flow switch applications, OEM systems, and retrofit kits

Specifications

• Model: RFO (RotorFlow® series), Part #155481

• Flow ranges:
  – Standard: 4–20 GPM @ ±15%
  – Low-flow: 1.5–12 GPM @ ±7%

• Pressure rating: max 100 psi (6.9 bar)

• Materials: Polypropylene body; ceramic/PPS rotor; Buna N o-rings

• Electrical: 4.5–24 V DC supply; 8 mA typical; pulsed output

• Cable: 24″, 22 AWG, 3-conductor PVC

• Operating temp: –20 °F to 180 °F (–29 °C to 82 °C)

• Connection: ½″ female NPT

• Compliance: Panel mount ready; datasheet and manuals available

• Warranty: Standard 1-year manufacturer warranty