zws ultrasonic sensors

Sensor matrix of standard sensors


The zws sensors are among the smallest ultrasonic sensors available on the market in cuboidal housings with Teach-in buttons.

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  • Ultrasonic sensor in miniature housing
  • Installation-compatible with many optical sensors a true alternative for critical applications
  • Up to 250 Hz switching frequency for fast sampling
  • Optionally with SoundPipe zws1 waveguide attachment
  • Synchronisation input
  • Improved temperature compensation adjustment to working conditions within 45 seconds


  • 1 switching output in pnp or npn variant
  • Analogue output 4–20 mA or 0–10 V
  • 6 detection ranges with a measurement range of 20 mm to 1 m
  • microsonic Teach-in by using a button
  • 20–30 V operating voltage


The miniature sensor housing

of the zws-15 has a dimensions of 20 mm x 32 mm x 12 mm. The housing’s design and mounting is compatible with many optical sensors. This facilitates the conversion to ultrasonic sensors for critical applications.

For the zws sensor range

2 output versions and 6 detection ranges are available:

1 switching output, optionally in pnp or npn circuitry
1 analogue output 4–20 mA or 0–10 V

The Teach-in button

on the top facilitates the convenient setting of the sensor.

Two LEDs

in the sensor housing’s upper half indicate the switched output and respectively the analogue output states.

The zws sensors with switched output have three operating modes:

  • Single switching point
  • Two-way reflective barrier
  • Window mode

Teach-in of a single switching point

by positioning the object to be detected within the desired distance (1) to the sensor, pressing the button for approx. 3 seconds and then pressing it once more for approx. 1 second. Ready.

Teach-in of a switching point

Teach-in of a two-way reflective barrier

with a fixed reflector can be set up with the help of a permanently mounted reflector by mounting the zws sensor and the reflector, then pressing the button for approx.

3 seconds and then pressing it once more for approx. 10 seconds. Now, the two-way reflective barrier has been set.

Teach-in of a two-way reflective barrier

Set the analogue output

by initially positioning the object to be detected on the sensor-close window limit (1), pressing the button for approx. 3 seconds, shifting the object to the sensor-distant window limit (2) and pressing the button once more for approx. 1 second. Ready.

Teach-in of an analogue characteristic or of a window with two switching points

To set a window

with two detection points on a single switched output, the procedure is the same as setting the analogue.


and rising/falling analogue characteristic curve can also be set using the push-button.

The control input on pin 2

can be used to synchronise multiple zws sensors with each other. The SyncBox2 , which is available as an accessory, generates a synchronisation signal output on pin 2. This permits up to 50 zws sensors to be autonomously synchronised.

Synchronisation of up to 50 zws sensors

The temperature compensation of the analogue sensors

profits from a significant improvement. The sensors reach their operating point only 45 seconds after activation of the operating voltage.

High counting frequencies, short response times - no problem for the zws-7 ultrasonic sensor

zws-7: 250 Hz switching frequency for fast measurement

At a maximum detection range of 100 mm, the zws-7 can achieve a switching frequency of 250 Hz.

This allows both detection of objects with a high counting frequency and extremely narrow gaps between two objects at fast machinery speeds. The zws-7 responds under 3 ms.

Additionally fitting the new SoundPipe zws1 (Accessories) to the zws-7 markedly raises the power to detect narrow gaps between two objects at high machine speeds.

Fast zws-7 - Fast zws-7/-15 with SoundPipe

The zws-7, with a 250 Hz switching frequency, is particularly suitable for counting tasks at high machine speeds.

Technical data:
Operating range: 70 mm
Maximum range: 100 mm
Switching frequency: 250 Hz
Response time: < 3 ms

zws-15 with SoundPipe - 1st place for sound field focusing (e.g. for level control)

Brings on intensively bundled sound field directly to the measuring point

The SoundPipe zws1 (Accessories) can be used with any zws-15 or zws-7 sensor. It directs sound to the measuring point thus allowing measurements to be taken in drill holes and openings with diameters under 5 mm.

Measurement can be carried out directly before the sound exit opening, since the blind zone is inside the SoundPipe.

The SoundPipe zws1 is attached to the front of the zws-15 or zws-7 sensor.

A typical field of application is measuring levels in microplate wells which are used in medical analysis technology. The SoundPipe zws1 can be directly placed over the opening; this makes exact positioning that much easier. The attachment can also be used in scanning gaps of only a few millimetres in width between two objects.

The zws sensors are ideal for probing of circuit boards and wafers in the electronic industry or for use in packaging machines in which high-transparency films must be detected.

With the SoundPipe, the zws-15 sensor can measure fill levels in the smallest of openings.


The SoundPipe is directly positioned over the measuring point.