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Precision Liquid Level Sensing: Anytime. Anywhere. Your Way.
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EXCEPTIONAL RADAR PERFORMANCE

The TRUE ECHO® CR-L is a radar liquid level sensor, bringing reliable accuracy of radar sensors to industrial liquid level measurement. Our radar is engineered with you in mind so you can feel confident with your application.

RELIABLE ACCURACY

The Frequency Modulated Continuous Wave (FMCW) 80Ghz radar ensures precise and reliable measurement.  The 4 º half angle beam reduces side interference and simplifies the installation.

TRUE Echo bluetooth app


  • Experience seamless integration with the TRUE ECHO Bluetooth app, designed to simplify the setup and optimization of your TRUE ECHO CR-L sensors.

  • Ease-of-Setup

    Achieve exceptional precision in your liquid level measurements with accurate and easy-to-follow setup instructions directly through the app.

  • Versatile Functionality

    This TRUE ECHO Bluetooth app provides the flexibility to fine-tune your sensors to handle many applications.

  • Real-Time Monitoring

    Monitor sensor performance and receive real-time updates, ensuring that your system is always operating at peak efficiency.

product specifications

Performance

  • Range: 7.87" to 49.21 ft (0.3 to 15m)
  • Measuring Frequency: W Band, 76 to 81 GHz, 5GHz FMCW bandwidth
  • Update Rate:
    • 4-20mA: Automatic adjustment 1 to 3Hz
    • RS-485: 1.25Hz
  • Accuracy: ± 3mm
  • Beam Angle: 8° (4° half angle)

Environmental

  • Process Temperature: -40° to 158°F (-40° to 70°C)
  • Process Pressure: -14.5 to 43.51 psi
  • Dielectric Constant of Measured Medium: ≥ 2
  • Protection Rating: IP67

Electrical

  • Operating Voltage:
    • 4-20mA: 16-28 VDC
    • RS-485: 12-28 VDC (<16mA @ 24 VDC)
  • Reverse Voltage Protection: ≤30V
  • Spike Protection: <3kW
  • Cable: Polyurethane jacket with shielded 18awg wires

Connectivity

  • Output Signal:
    • 4-20mA: 2 wire + shield
    • RS-485: 4 wire + shield
  • Bluetooth Version: 5
  • Fault Output (4-20 only): 3.6mA, 22mA, or Last Value

Physical

  • Housing: Polyvinylidene Fluoride (PVDF) or Polyethylene (PE)
  • Mounting: 2" NPT process fitting, 3/4" NPT with nut top mount
  • Diameter: 2.72" (69mm)
  • Height: 5.39" (137mm)
  • Weight: 18.87 oz (535 g)

Certifications

  • FCC
  • ISED
  • CE

frequently asked questions

• Liquid Level Measurement: Used in tanks, wells, pits, or lakes.
• Open Channel Flow: Used in water treatment plants, environmental monitoring, and irrigation canals for flow calculation.
• Wastewater: Performs well in sludge and clarifier measurements.
• Chemical: Effective in harsh environments.
• Food and Beverages: Ideal for maintaining hygiene and precision.
Ultrasonic level sensors operate by emitting a burst of sound waves that travel to the target and bounce back to the sensor. It needs an unobstructed air column between the sensor and target. Temperature compensation is used to adjust for the speed of sound in air over the working temperature range.

Radar level sensors utilize electromagnetic waves that travel to the target and bounce back to the sensor. These waves travel much faster and are less affected by temperature. Radar can measure longer distances with more stable results. The radar's effectiveness depends on the target material’s dielectric constant.
Dielectrics are materials that don't allow current to flow. They are more often called insulators because they are the exact opposite of conductors. The dielectric constant is a measure of the amount of electric potential energy, in the form of induced polarization that is stored in a given volume of material under the action of an electric field. It is expressed as the ratio of the dielectric permittivity of the material to that of a vacuum or dry air. Here are a few examples of the dielectric constants of different materials. Additional information can be found on the web.

Air = 1.000586
Crude Oil = 2.428
Polyethelyne = 2.3 - 2.4
Water = 80
Yes, the sensor can look through most plastic containers and measure the liquid level inside.
The CR-L performs best with liquids. For solids, please contact APG to explore other options.
The CR-L is not rated for explosive environments. Please contact APG to explore other options.

Support

World Class Support

At APG, we are committed to providing exceptional product support to ensure that your experience with the TRUE ECHO CR-L is smooth, reliable, and hassle-free. Our dedicated support team is here to assist you throughout every step of your journey, from initial setup to ongoing operation and beyond.

WANT TO LEARN MORE?

View the TRUE ECHO product page for more details.
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