OCF 5.0 Open Channel Flow Monitor

  • Maximum Range​ of Sensor
    32 ft (10m)
  • Accuracy​
    ±0.25% of Range
  • Output​
    Isolated 4-20mA, 1000 ohm load maximum
  • Data Logger                                                                                                 Optional 2 million point Data Logger with USB output to Flash memory
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OCF 5.0 Open Channel Flow Monitor

Continuously monitor, display, totalize and data log flow through any flume or weir. The OCF 5.0 includes a non-contacting ultrasonic sensor that mounts just 8" (203.2 mm) above the flowing water. It is accurate (±0.25%) and reliable. There is no obstruction to flow and no fouling. Use the built-in Keypad/menu system to select your flume or weir from the Menu and to choose measurement units (gallons, liters etc.)

The Greyline OCF 5.0 includes built-in 2-million point Data Logger and flow reporting system. Connect a flash memory stick to the flowmeter's USB output to download log files and then view your data in graph and table formats with 'Greyline Logger' software – supplied free with each OCF 5.0. Daily flow reports including minimum, maximum, average and total daily flow can be viewed directly on the backlit OCF 5.0 LCD display.  

New! Logger Download to USB Flash Drive

Use the isolated 4-20mA to transmit flow to remote chart recorders or displays, and the control relays are programmable for level/flow alarm, and flow proportionate pulse (for samplers, chlorinators or remote totalizers). An Intrinsic Safety Barrier is optional for sensor and cable installation in hazardous rated locations. The separate, watertight electronics/display enclosure is mounted at a convenient location within 500 ft (150 m) of the sensor.

General Specification
Transmitter Enclosure 

Watertight and dust tight NEMA4X (IP 66) polycarbonate with clear, shatterproof cover

Transmitter operating temperature: -20°C to +60°C
Display White, backlit matrix - displays flow rate, totalizer, relay status, operating mode and calibration menu
Outputs Isolated 4-20mA/0-5V, 1000 ohm load maximum, programmable offset
Control Relays 2 form 'C' dry contacts rated 5 amp SPDT; programmable level alarm, pump control, pump alternation, failsafe/echo-loss, air temperature alarm
Accuracy ±0.25% of Range or 2 mm (0.08") whichever is greater
Repeatability and Linearity ±0.1%
Sensor Specification
Maximum range

15 ft (4.57 m) with standard PZ15 sensor

Deadband (Blanking) Programmable, Minimum 8 in (203.2 mm)
Beam angle
Operating Frequency 92 KHz
Operating temperature: -40°C to +65°C 
Exposed material PVC
Sensor cable RG62AU coaxial
Submersion Rating Protected for accidental submersion to 10 ft (3 m) maximum

Open channel Flow