Stafford, Texas

EchoTREK, Ultrasonic Level Transmitter for Solids

EchoTREK, Ultrasonic Level Transmitter for Solids

The 4-wire EchoTREK Series compact ultrasonic level transmitters are designed for solids level monitoring tasks where previously only more complex, two part systems have performed adequately. These ultrasonic level sensors have high efficiency SenSonic narrow beam angle transducers, which gives superb signal transmission and allows the EchoTREK Series to overcome filling noise, dusting, and irregular surface formations (in most cases). This high performance, compact, powder and solids level measurement transmitter is equipped with QUEST+ software, which uses advanced process adaptive signal processing for reliable echo monitoring.

  • Non-contact level measurement with IP65 protection
  • 4-wire integrated (blind) level transmitters, HART communication
  • Maximum 200 feet measuring range
  • Narrow (5°) beam angle
  • Full temperature compensation
  • Dust Ex version
  • Plug-in display unit


  • 4-wire transmitter
  • Non-contact level metering
  • Narrow 5° beam angle, 32-point linearization
  • Excellent signal processing and temperature compensation
  • Secondary lightning protection
  • PP and aluminum housing transducers with PVC foam
  • Joystick aiming device
  • Plug-in display module
  • Powder-coated aliminum housing
  • Explosion-proof variants available
  • Level and volume measurement
  • Fail-safe indication
  • 5 year warranty


  • Measurement of normal and explosive dust hazardous powders and bulk solids
  • Level measurement of free flowing solids, light powders, coarse bulk solid materials
  • Level, volume, and weight calculation
  • Long distance measurement
  • Light dust during filling
  • Chemical industry
  • Food and beverage
  • Mining industry

Ultrasonic Level Sensors Measuring an Echo

Ultrasonic level metering technology is based on the principle of measuring the time required for the ultrasound pulses to cover the distance from the sensor to the surface of the medium and back. The echoes bounced back from the surface reach the face of the sensor after the time of flight of the ultrasonic impulse. The time of flight of the reflected signal is measured and processed by the electronics, and then this is converted to distance, level, volume or mass proportional data with the help of the customizable tank shape and dimensions. The intelligent QUEST+ process adaptive signal processing software system ensures that the electronics identifies and validates the solids surface signal, giving reliable level monitoring.

Coning or arching caused by the filling and emptying process can result in an adversely weak echo when the transducer is installed vertically. The joystick aiming device, an important part of the EchoTREK Series ultrasonic level transmitters offers a suitable solution to minimize most of the these unfavorable effects. The optimal tilting position can be adjusted during operation and is recommended to be checked at multiple levels during the filling and emptying process. As a general rule, the best result is obtained by the transducer aimed towards the center of the tank bottom.

Easy to Mount and Retrofit Ultrasonic Level Sensor

Coning or arching is a general feature of solid material storage is caused by the filling and emptying process. Optimizing the aiming by the joystick is recommended in these situations. The drawing on the right shows a special flange that provides easy and fast mounting on the silo top. In case the entire tilting range of the aiming arm is required, the diameter of the opening “D” and the thickness of the roof “V” is to be taken into account.

Ultrasonic Level Transmitter in HART Multidrop Loop

The MultiCONT processes and displays measurement data supplied by HART equipped level transmitters connected to a Multidrop loop. Up to 15 transmitters (also mixed models) can be connected, and remote programming can be also performed through the MultiCONT. Re-transmission of the data is possible via RS485 communication line to a PC or PLC when needed. Instruments with HART output can be connected to a PC interfaced by a UNICOMM HART-USB modem. All measured values can be visualized and/or the transmitters can be remote programmed by the PC. Applicable software: EView2 configuration software or NIVISION process visualization software.

EchoTREK Ultrasonic Level Transmitter Specifications

Supply voltage 85…255 V AC; 11.4…40 V DC; 11.4…28 V AC
Ambient temperature −22…140°F
Process temperature −22…140°F
Measuring range 2…200 feet
Output 4…20 mA, HART, relay
Process connection joystick aiming device
Ingress protection IP65
Approvals ATEX

EchoTREK Ultrasonic Level Transmitter Model Line-Up

EchoTREK SCD-300
System 4-wire
Accuracy* ± (0.2% of measured distance + 0.1% of range)
Resolution 10 mm (0.4 inch)
Analog 4 – 20 mA
Relay SPDT, 250 V AC / 3 A, AC1
Digital communication HART
Ambient temperature -22°F…140°F,
with display: -13°F…140°F
Process temperature -22°F…167°F
Process pressure 0.7 – 1.1 bar (0.07 – 0.11 MPa [10 – 16 psi g])
Pabsolute and ±0.1 bar (0.01 MPa [1.45 psi g]) difference between ambient and tank pressure
Power supply I. version: 85 – 255 V AC / 6.8 VA
II. version: 11.4 – 40 V DC / 4.1 W and 11.4 – 28 V AC / 4.6 VA
Electrical protection Class I
Housing Paint coated aluminum
Electrical connection 2x M20x1.5 plastic cable glands for Ø6 – Ø12 mm (0.25 – 0.45 in) cable, 3x terminal blocks for max. 2.5 mm2 (AWG16) wire cross section, 2x 1⁄2″ NPT internal threads for cable protective pipes.
Ex version: See: “Ex Certified” table below
Ingress protection IP65
Explosion protection See: “Ex Certified” table below
Mass ~15.4 lb or 22 lb

*under optimum conditions and stabilized transducer temperature

Ex Certified Level Transmitter Model Line-Up

EchoTREK SCD-300
Protection type Dust Ex
Ex marking II 1/2 D Ex ma ta/tb IIIC T85°C…T130 °C Da/Db
Ambient temperature -22°F…140°F,
with display: -13°F…140°F
Process temperature -22°F…167°F
Electrical connection 2x M20x1.5 cable glands with Ex ta IIIC protecion type for Ø7 – Ø12 mm cable,
3x terminal blocks for maximum 2.5 mm2 wire cross section, 2x 1⁄2″ NPT internal threads for cable protective pipes
Output relay: SPDT, 250 V AC / 3 A, AC1