ChannelFlo™ OCRA, Flocorp-Radar Open Channel Flow Meter

The ChannelFlo™ OCRA Radar Open Channel Flow Meter is an all-in-one solution preconfigured for open channel flow. The OCRA can provide accurate measurements in a wide variety of applications such as small streams, sewers, large rivers, V-notch weirs, and flumes. Our technology allows precision continuous measurement that allows the user to monitor remotely at the convenience of a PC or locally at the display. All of our ChannelFlo™ systems are calibrated for your specific application before leaving our factory for easy setup and installation in the field. In an Open Channel application, it is very important to have a quality, durable, and accurate level measurement sensor. Our Tracer Air™ Radar Level Transmitter measures up to 98 feet, has no moving parts, and can measure solids or liquids. The next component in the OCRA is an intuitive, reliable monitoring device. Our CONNEX 3D™ is a high performance, industrial-grade analog I/O device with digital communications that offer flexibility, reliability, and affordability on a DIN mount platform. The CONNEX 3D™ is supplied with remote monitoring software that can remotely monitor, receive e-mail alerts, data log, and much more. If you require a pump to control the eXmod™ Relay Expansion module is recommended. The eXmod connects to the CONNEX 3D™ via RS-485 serial communication (4-wire) and provides a 10 AMP AC/DC rated relay to maximize the system's capabilities.

Features & Benefits

  • Small antenna size, non-contact radar, rugged design
  • Pre-calibrated for easy installation and setup
  • No moving parts
  • Measures solids or liquids
  • Ideal for difficult levels measurement applications such as vapor, steam, pressure, change of temperature, dust, and foam.
  • High SNR, even in the case of fluctuations results in the accurate performance
  • High frequency, the best choice to measure solids, and low dielectric media



Measuring Range


SS 304: 98 feet (30 meters)

PTFE: 65 feet (20 meters)

Process Connection1½ NPT
Antenna MaterialSS 304 or PTFE
Application Temperature-40ºF to 482ºF (-40ºC to 250ºC)
Process Pressure-0.1 ~ 4.0 Mpa
Frequency Range26GHz


Signal Output

4-20mA / HART®(Two-wire / Four) RS485/


Cable Entry1/2 NPT
Hazardous LocationIntrinsically Safe (Exia IIC T6 Ga)
Display Type6-digit, Red LED
Display UnitsEngineering
Decimal PointUp to 5 places
Display Output-99999 to 999999


Status Indicators

(1) Totalizer, Yellow LED

(4) Relay, Red LED

Display Height0.6” (15 mm)
Over RangeThe display flashes HIGH and Max. Display Value
Under RangeDisplay flashes LOW and Min. Display Value
User InterfaceFour touch screen buttons or DigaLink PC Windows® Software
Display Refresh Rate


Once Per Second (1/s)



Programmable, restricts modification of settings
Operating TemperatureF: 32º to 140º C: 0º to 60º
Storage TemperatureF: -40º to 185º C: -40º to 85º
Relative Humidity0 to 90º non-condensing
Accuracy±0.1% of calibrated span ± count


Temperature Drift

0.005% of calibrated span/º C max from 0 to 65ºC ambient; 0.01% of calibrated span/ºC max from -40 to 0º C ambient



Supply Voltage

AC Supply: 90-265 VAC @ 50-60 Hz, 15W


DC Supply: 12-28 VDC @ 0.5A

(Fuse protected via 0.5A slow blow)



Transmitter Power

120 mA @ 24 VDC

24 VDC for AC powered units;

For DC powered units, supply voltage equals the DC input voltage

Pulse Input1 to 24 VDC, 1 to 3000 Hz
Frequency Input125 mV to 12 VAC, 1 to 30 KHz
Digital InputRemote total reset
Analog Input4-20 mA current loop, 0-5 VDC, 1-5 VDC, 0-10 VDC
Analog OutputIsolated 4-20 mA current loop

Download Datasheet: ChannelFlo™ OCRA Radar Open Channel Flow Meter