Radar Liquid Level Sensor
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Radar Liquid Level Sensor

TRUE ECHO® CR-L

Precision Liquid Level Sensing: Anytime. Anywhere. Your Way

The TRUE ECHO® CR-L Radar Liquid Level Sensor delivers precise, reliable measurements in a variety of industrial liquid applications. With a range up to 49.2 feet (15 m) and a minimum blind zone of just 7.87 inches (0.2 m), this sensor ensures accurate readings even in challenging environments. The narrow radar beam detects small targets, providing high-resolution measurements. The TRUE ECHO® CR-L is chemical resistant and features both 4-20mA and RS-485 outputs. It is easy to install, field calibrate, and adjust through the TRUE ECHO app, streamlining setup and operation.

  • Precision Measurement: Offers high-resolution readings with a range of up to 49.2 feet (15 m).
  • Versatile Applications: The narrow radar beam detects small targets, suitable for a wide range of industrial environments.
  • Chemical Resistant: Built for durability in harsh environments.
  • Easy Calibration: Field-calibratable and programmable via the TRUE ECHO app for simplified operation.
  • Reliable Performance: Quick readings with automatic updates, and high accuracy of ±3mm.

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TRUE ECHO CR-L
Datasheet

TRUE ECHO CR-L
User Manual

TRUE ECHO CR-L
Install Guide
  • Range: 7.87″ to 49.21 ft. (0.2 to 15m)
  • Measuring Frequency: W Band, 76 to 81 GHz, 5 GHz FMCW bandwidth
  • Update Range:
    • 4-20mA: Automatic adjustment 1 to 3Hz
    • RS-485: 3Hz
  • Power on to 1st Reading*:
    • 4-20mA: 7 seconds
    • RS-485: 7 seconds

*times to first reading is determined by the Damping setting, as explained in the User Manual.

  • Accuracy: ± 3mm
  • Beam Angle: 8º (4º half angle)
  • Process Temp: -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
  • Operating Voltage:
    • 4-20mA: 16-28 VDC
    • RS-485: 12-28 VDC (<10mA @ 24 VDC)
  • Reverse Voltage Protection: ≤30V
  • Spike Protection: <3kW
  • Cable: Polyurethane jacket with shielded 18awg wires
  • Output Signal:
    • 4-20mA: 2 wire + shield
    • RS-485: 4 wire + shield
  • Bluetooth Version: 5
  • Fault Output (4-20 only): 3.6, 22mA, or Last Value
  • Housing: PVDF or PE
  • Process Fitting: 2” NPT
  • Diameter: 2.72” (69mm)
  • Height: 5.39” (137mm)
  • Weight: 18.87 oz (535g)
  • FCC
  • ISED
  • CE
What are common applications for the TRUE ECHO® CR-L Radar Level Sensor?
  • 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

No, it maintains long-term accuracy with minimal recalibration. However, it is field-calibratable and can be easily adjusted via the TRUE ECHO app.

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.

CERTIFICATION

CE, FCC, ISED
ENCLOSURE PROTECTION

IP67
RANGE

1' – 15', 1' – 25', 1' – 30', 1' – 50'
OUTPUT

4-20 mA, Modbus
INDUSTRY

Chemical, Industrial Automation, Marine, Oil & Gas, Water & Wastewater
MOUNT

2", 3/4"

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WARRANTY

APG warrants its products to be free from defects in material and workmanship under normal use and service of the product for 24 months from the date of shipment from APG, unless otherwise specified by APG in writing. Read our full warranty policy HERE.

RETURNS

Returns and allowances must be authorized by APG in advance, which authorization may be granted or withheld by APG in APG’s sole and absolute discretion. Read our full return policy HERE.

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