Stafford, Texas

EchoTREK Series, Ultrasonic Level Transmitter for Liquids

EchoTREK Series, Ultrasonic Level Transmitter for Liquids

The EchoTREK Series Ultrasonic Level Transmitter for Liquids are high performance level transmitters for liquid level measurement in sumps or tanks, for tank contents measurement, or open channel flow measurement. Installed on the tank roof or above the liquid surface to be measured, these transmitters give analog output proportional to liquid level or transmit HART digital data. The EchoTREK Series are intelligent, compact ultrasonic level transmitters with 4 – 20 mA output and HART protocol communication. Local reading is ensured by a plug-in display which can be removed if displaying is not needed. Four keys provide for programming, both display and keys are located under a removable cover. The unit is tank-top mountable only.

  • 2-wire, 4-wire compact, 2-wire integrated level transmitters
  • Non-contact level measurement with narrow (5°) beam angle
  • Maximum 82 feet measuring range
  • 12 V battery and HART communication option
  • Full temperature compensation
  • IP68 rated integrated (blind) type
  • Plug-in display unit for the compact types
  • Ex version and handheld compatibility option


  • 2-wire or 4-wire transmitter
  • Non-contact level metering
  • Narrow 5° beam angle
  • Excellent signal processing
  • Temperature compensated
  • Secondary lightning protection
  • 32-point linearization
  • PP, PVDF, PTFE housing and transducers
  • Plug-in display module
  • Plastic, aluminum, or stainless steel housing
  • Explosion-proof variants available
  • Level and volume measurement and display
  • Open channel flow measurement
  • Fail-safe indication
  • 5 year warranty


  • Level measurement of most liquids and slurries
  • Flammable liquids and corrosive chemicals
  • Agriculture
  • Construction materials
  • Chemical industry
  • Food and beverage
  • Oil industry
  • Paper mill
  • Water and wastewater industry
  • Vapor, fume, mixing blades, and light foam
  • Open channel flow metering
  • Level measurement in basins, wells, sumps, lift-stations
  • Level measurement of hydrocarbons, acids, aggressive liquids, any water based medium

Ultrasonic Level Sensor Technology Using Echo Detection

The 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 level to be measured and back. The echoes bounced back from the surface of the medium to be measured reach the sensor surface 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 flow proportional data with the help of the customizable tank dimensions or the pre-programmed flume / weir parameters. The intelligent QUEST+ process adaptive signal processing software system ensures that the electronics identifies and validates the liquid surface signal, giving reliable level monitoring.

EchoTREK for Liquids Ultrasonic Level Transmitter

The EchoTREK Series can be used in multi-drop systems connected to MultiCONT process controller and display, or to a PC with the help of the UNICOMM HART USB and RS485 modem or similar. The EchoTREK Series is available with measurement ranges up to 82 feet, providing wide application possibilities. These ultrasonic level transmitters are use SenSonic range transducers with a full beam angle of 5 to 7 degrees connected to intelligent electronics featuring the QUEST+ advanced signal processing algorithm.

HART Protocol and PC Communications

The instruments with HART output can be connected to a PC using a UNICOMM SAK-305 HART-USB modem. All measured values of the EchoTREK ultrasonic level transmitters can be visualized and/or the instruments can be remotely programmed via digital HART communication. Applicable software for PC: EView2 configuration software or NIVISION process visualization software. The level sensors with HART output can be connected to a PC via Bluetooth wireless connection using a UNICOMM HART- USB-Bluetooth modem (SAT-504). Power supply can be provided for the system with a USB power bank connected to the UNICOMM modem.

Ultrasonic Level Transmitters in HART Multidrop Loop

The MultiCONT multichannel process controller processes and displays measurement data supplied by HART equipped transmitters connected to a Multidrop loop. The transmitters (also mixed models) can be connected and remote programming can be also performed through theMultiCONT. Re-transmission of the data is possible via RS485 communication line to a PC or PLC when needed. The visualisation of the data can be done by NIVISION process visualization software. With the help of MultiCONT, different useful functions can be achieved such as configuring and optimizing the measurement or displaying the special echo map of the process environment.

Easy Process Control with EchoTREK Series Level Sensors for Liquids

With the help of the SAP-200 plug-in display a full-parameter programming can be accomplished, the parameters of measurement and output can be set using the alphanumeric display module. The large LCD display displays the measured values in numerical and bar graph form. The display features indication for the infrared communication (IrDA) port which provides possibility for logger readout, diagnostics and software upgrade.

The MultiCONT multichannel process controller and display unit is able to visualize the Echo Map. The Echo Map feature helps to detect false reflections and aids the optimization of the measurement configuration.

EchoTREK for Liquids Ultrasonic Level Transmitter Specifications

Supply voltage 2-wire: 12…36 V DC 4-wire: 85…255 V AC, 20…28 V AC/DC
Ambient temperature −22…158°F
Process temperature −22…212°F
Process pressure (absolute): 7.5…43.5 psig
Measuring range 0.65…82 feet
Output 4…20 mA, HART, relay
Process connection 1½”, 2″ BSP / NPT, flange
Ingress protection IP67
EchoTREK Ultrasonic Level Transmitter for Liquids Model Line-Up
SE/SG-300 ST/SB-400
System 2-wire 4-wire
Accuracy(1) ± (0.2% of measured distance +0.05% of range)
Resolution Depending on the measured distance:
<6.5 ft: 0.04 in, 6.5–16.5 ft: 0.075 in, 16.5–33 ft: 0.2 in, >33 ft: 0.4 in
Analog 4 – 20 mA
Relay(2) #1 SPDT, 250 V AC, 3 A AC1
#2 SPDT, 30 V DC, 1 A DC
Display SAP-200: 6-digit plug-in LCD display
Digital Communication HART
Ambient temperature With plastic housing: -13°F…158°F, with metal housing: -22°F…158°F,
with display: -13°F…158°F
Pressure (absolute) (3)0.5 – 3 bar (7.5 – 43.5 psig),
with stainless steel transducer: 0.9 – 1.1 bar (13 – 16 psig)
Power supply 12(4) – 36 V DC / 48 – 720 mW 85 – 255 V AC / 2 VA
20 – 28 V AC/DC / 3 VA / 3 W
Electrical protection In case of DC power supply: Class III
In case of AC power supply:
with metal housing: Class I
with plastic housing: Class II
Housing Plastic (PBT), paint coated aluminum or stainless steel Plastic (PBT), paint coated aluminum
Sealing In case of PP transducer: EPDM; all the other transducers: FPM (Viton)
Electrical connection 2x M20x1.5 cable glands + internal thread for 2x 1⁄2″ NPT cable protective pipe, cable outer diameter: Ø0.25 – 0.45 inch,
wire cross section: maximum 1.5 mm2 (AWG15)
Ingress protection Transducer: IP68, Housing: IP67
Explosion protection See: “Ex Certified” table below None
Mass 2.85 – 5 lb

(1) under optimum conditions and stabilized transducer temperature
(2) 4-wire EchoTREK transmitters have two parallel operating relays
(3) for pressure less than 0.5 bar (14.5 psig) please send us an inquiry
(4) only partial operation is provided, reliable operation without any restrictions is guaranteed at >13.4 V terminal voltage

Ex Certified EchoTREK Ultrasonic Level Transmitters

EchoTREK SP-300
Protection type Intrinsically safe
Ex marking (ATEX) II 1 G Ex ia IIB T6…T4 Ga
Intrinsically safe data Ci ≤ 15 nF, Li ≤ 200 μH, Ui ≤ 30 V, Ii ≤ 140 mA, Pi ≤ 1 W
Ambient temperature With plastic housing: -4°F…158°F;
with metal housing: -22°F…158°F;
with display: -13°F…158°F
Process temperature With PP transducer: -4°F…158°F;
with PVDF transducer: -4°F…176°F;
with PTFE transducer: -22°F…194°F
with stainless steel transducer: -22°F…212°F
Electrical connection 2x M20x1.5 metal cable glands