420B/412B Series of Ultrasonic Sensors With Adjustable Sound Cone

June 13, 2024
Available with an adjustable sound cone and switching (HTU) or measuring (DMU) sensors, Leuze's 420B and 412B series of ultrasonic sensors easily adapt to their application.

With an adjustable sound cone and a small dead zone, the 420B and 412B series of ultrasonic sensors can be used for many different applications.

Helping to reduce the number of different sensors used in your systems, the 420B and 412B series are available with an adjustable sound cone and offered as switching (HTU) or measuring (DMU) sensors.

The sound cone can be set via an IO-Link interface to 3 ranges—narrow, medium, or wide—to adapt to the application. They detect glossy, reflective, very dark, or transparent surfaces as well as liquids without issue.

The 420B series includes ultrasonic sensors in compact cubic plastic housings. Replacing the 420 series, the new devices have a smaller dead zone with the same or a higher sensor operating range.

The 412B series complements the range of cylindrical sensors in an M12 housing with devices featuring IO-Link and analog output.

Thanks to their adjustable sound cone, IO-Link interface, and two switching outputs, the HTU420B ultrasonic sensors in the red housing are suitable for challenging detection tasks. For example, two fill levels can be detected or two positions can be monitored simultaneously. The adjustable sound cone turns the sensors into flexible all-rounders. A narrow sound cone, for example, is suitable for detecting a fill level through small container openings. In its wide setting, the sound cone in turn captures larger areas—ideal in the case of bulk material or diffusely reflective objects with complex surface or structure.

An interruption filter detects brief changes in measurement within a certain interval caused by interfering objects (e.g. an agitator). The sensor suppresses these interfering signals via the IO-Link interface.

To measure distances, system operators can make use of the DMU420B and DMU412B ultrasonic distance sensors. The devices have an analog output (either current or voltage), an IO-Link interface as well as an adjustable sound cone.

The HTU420B ultrasonic sensors are also offered in a standard design with a black plastic housing. As an economical solution with one switching output (push-pull), they're suitable for simple detection tasks. Both variants are available in the operating ranges from 0.4 to 10, 0.6 to 20, and 0.8 to 40 in. (10 to 250, 15 to 500, and 20 to 1,000 mm). The HTU412B series has an operating range of 0.6 to 20 in. (15 to 500 mm).

The cubic sensors, measuring 0.8 x 2 x 0.6 in. (20.5 x 41 x 15 mm), are extremely compact. The cylindrical sensors of the HTU412B series too are just 2 in. (50 mm) long. They are particularly suitable for applications in constrained spaces. All types can be parameterized quickly; Easy setup and operation are possible using the teach button via the teach input or IO-Link.


  • Detection nearly independent of object and surface
  • Compact ultrasonic sensors and distance sensors in one series
  • Maximum flexibility for any application thanks to adjustable sound cone (narrow, medium, wide)
  • Monitoring of 2 positions or fill levels by means of 2 switching outputs
  • Interfering objects can be suppressed via the IO-Link interface (interruption filter)
  • High operating ranges (3 ranges) and small dead zones
  • Installation in constrained spaces thanks to small design
  • Easy parameterization via teach button, IO-Link interface, or teach input
  HTU420B DMU420B HTU412B DMU412B
Operating Range 0.4 to 10, 0.6 to 20, and 0.8 to 40 in.
(10 to 250, 15 to 500, 20 to 1,000 mm)
0.6 to 20 in. (15 to 500 mm)
Response Time <25, <40, <60 ms <25 ms
Repeatability 0.02 in. (0.5 mm)
Accuracy - 2% - 2%
Hysteresis 4%
Operation teach-button, teach-in, IO-link teach-button, IO-link teach-in, IO-link teach-in, IO-link
Switching Outputs 1/2 1 1/2 1
Analog Output - current/voltage - current/voltage
IO-Link V1.1
Connection Type M8 (metal) M8 (metal) M12 M12
Dimensions 0.8 x 2 x 0.6 in. (20.5 x 41 x 15 mm) M12 x 2 in. (50 mm)
Temp. Range -13 to 149°F (- 25 to 65°C)
Degree of Protection IP67
Adjustable Sound Cone Yes (models with IO-Link) Yes Yes Yes

Leuze electronic, Inc.
Duluth, GA
(470) 508-3600
[email protected]

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