Ultrasonic sensors Ultrasonic sensors 19.1 Ultrasonic sensing – Versatile solutions for many applications Ultrasonic sensors detect a multitude of objects contactless and wear-free with ultrasonic waves. In contrast to other sensing technologies, it is not impor- tant whether the object is transparent or opaque, metallic or non-metallic, firm, liquid or powdery. More important is the surface of the objects. The smoother the surface, the better the reflectivity and the larger the range. The application possibilities for ultrasonic sensors are nearly infinite. Whether level or height detection, measurement of dis- tance or object counting, ultrasonic sen- sors detect objects of different material qualities and within a large range. Envi- ronmental conditions such as spray, dust or rain hardly affect their functionality. Ultrasonic diffuse mode sensors detect all objects that echo back ultrasonic waves. For this purpose the sensor emits ultra- sonic pulses in cyclic periods. The echo is reverberated and transformed into an electrical signal through the sensor‘s transducer. The distance between the sensor and object is determined through the echo propagation principle, whereby the period between pulse emission and reverberation is related to a given sonic speed. Ultrasonic sensors are also available as opposed and diffuse mode devices. In op- posed mode, ultrasonic waves are contin- uously propagating between emitter and receiver. If an object crosses the wave, re- verberation is cut off and the sensor pro- duces a switching signal. TURCK‘s ultrasonic sensors are available in many different designs, measuring ranges, beam angles and output types. Most of them feature temperature com- pensation, noise suppression and a con- nection cable for autosynchronization (protection against crosstalk). Sensors with two switching outputs are suited for the control of minimum and maximum levels for example. Analog sensors are available with current and voltage output. Sensors with external transducer are best suited for confined spaces. Small objects are detected with pinpoint accuracy, using versions with a narrow beam angle of approx. 6°. Devices with wider beam angle of 12° to 15° are also available. Sensors with a beam angle of 60° are best suited for monitoring very large areas. They detect smooth and even surfaces easily and are insensitive to tilt. Ultrasonic sensors 691 [email protected]■ www.turck.com ■ Edition I/2010
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Ultrasonic sensors 19.1
Ultrasonic sensing – Versatile solutions for many applications
Ultrasonic sensors detect a multitude of objects contactless and wear-free with ultrasonic waves. In contrast to other sensing technologies, it is not impor-tant whether the object is transparent or opaque, metallic or non-metallic, fi rm, liquid or powdery. More important is the surface of the objects. The smoother the surface, the better the refl ectivity and the larger the range.
The application possibilities for ultrasonic sensors are nearly infi nite. Whether level or height detection, measurement of dis-tance or object counting, ultrasonic sen-sors detect objects of diff erent material qualities and within a large range. Envi-ronmental conditions such as spray, dust or rain hardly aff ect their functionality.
Ultrasonic diff use mode sensors detect all objects that echo back ultrasonic waves. For this purpose the sensor emits ultra-sonic pulses in cyclic periods. The echo is reverberated and transformed into an electrical signal through the sensor‘s transducer. The distance between the sensor and object is determined through the echo propagation principle, whereby the period between pulse emission and reverberation is related to a given sonic speed.
Ultrasonic sensors are also available as opposed and diff use mode devices. In op-posed mode, ultrasonic waves are contin-uously propagating between emitter and receiver. If an object crosses the wave, re-
verberation is cut off and the sensor pro-duces a switching signal.
TURCK‘s ultrasonic sensors are available in many diff erent designs, measuring ranges, beam angles and output types. Most of them feature temperature com-pensation, noise suppression and a con-nection cable for autosynchronization (protection against crosstalk).
Sensors with two switching outputs are suited for the control of minimum and maximum levels for example. Analog sensors are available with current and voltage output. Sensors with external transducer are best suited for confi ned spaces.
Small objects are detected with pinpoint accuracy, using versions with a narrow beam angle of approx. 6°. Devices with wider beam angle of 12° to 15° are also available. Sensors with a beam angle of 60° are best suited for monitoring very large areas. They detect smooth and even surfaces easily and are insensitive to tilt.
Broad product range – Diff erent designs and beam angles
TURCK ultrasonic sensors are available as metal threaded barrels M18/M30 or plas-tic rectangular Q30 devices with a narrow beam angle of 6°. They detect very small objects with pinpoint accuracy. The Q30 with a beam angle of 6° achieve ranges of up to 8 m. Q45U and T30U with beam angles of 12° to 15° achieve longer rang-
es. The beam angle of CP40 types is 60°. These sensors monitor large areas and are insensitive to tilt when detecting ob-jects with smooth and even surfaces.
The right choice for confi ned spaces is the Q45U with external transducer.
Highly effi cient – Extremely accurate at any given range
The achievable range of ultrasonic sen-sors depends on the wavelength re-spectively the frequency used. The greater the wavelength/lower the fre-quency, the larger the range. Compact sensors achieve ranges from 300 mm up to 500 mm. With large wavelengths of 5 mm ranges of 8 m and more can be achieved.
The accuracy of ultrasonic sensing is not only limited by the wavelength but also by the fl uctuation of sonic speed caused by temperature changes. Therefore most of the sensors are equipped with temper-ature compensation. This enables analog sensors to achieve a resolution of up to 0.6 mm over a wide temperature range.
Protection against interferences – Noise suppression and synchronization
Signal processing is not infl uenced by metallic clink or compressed air hissing. Such unwanted ambient noises are fi l-tered out through an optimally selected frequency range and a patented noise suppression circuit. Crosstalk between ultrasonic sensors is inhibited through multiplexing or synchronization.
Most sensors feature autosynchroniza-tion. For this purpose they emit ultrason-ic pulses synchronously and behave like one single sensor with extended beam angle, provided they are accordingly ar-ranged. Park distance controls in cars are based on ultrasonic sensors technology.
692 Hans Turck GmbH & Co. KG ■ Tel. +49 (2 08) 49 52-0 ■ Fax +49 (208) 49 52-264
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Ultrasonic sensors 19.2
ngths - Your adT30UX – Accurately measured values and minimal infl uence of temperature
Thanks to a powerful transducer and temperature compensation, the T30UX provide very accurately measured values. The diff use mode versions achieve ranges of up to 3 m and have short blind zones of only 10 % f.s. Through the integrated temperature compensation failure rates are reduced by approx. 90 %.
Within the defi ned temperature window of -40…+70 °C the range limits are kept stable with a slight drift of only 2.2 %. The IP67 rated sensors are applied in diff erent industrial sectors such as the automotive (detection of glass), paper manufactur-ing (sag control), pharmaceutical (level control) and many other fi elds of applica-tion.
M25U – All-metal ultrasonic sensors for aseptic applications
The M25U are fully encapsulated in stain-less steel and IP68/IP69K rated. They meet all requirements on hygenic design of the food and beverage as well as the pharmaceutical industry. The stainless steel housing not only resists chemicals and aggressive cleaning agents, it is also thermal-shock proof. The sensors resist hot cleaning at +60 °C immediately fol-lowed by cold rinsing at +10 °C easily.
The ultrasonic opposed mode sensor can be adjusted to two sensitivities: Normal sensitivity, max. range 1 m, for objects sizing Ø 30 mm and larger; high sensitiv-ity, max. range 40 cm, for objects sizing Ø 15 mm and larger.
QS18U – Also available with focussing adapter
The beam of some ultrasonic sensors such as the QS18U can be focussed with the UWG18 adapter. This allows small ob-
jects to be detected free from interfering ambient conditions. Measurements in tubes and barrels are also possible.
The CP40 detect glass or metal objects with a smooth surface, even with oblique incidence of the sensing beam. They cover a wide sensing range of 5 cm to 180 cm with a beam angle of 60°.
They are available with PNP transistor or Analog output 0…10 VDC / 0…20 mA
Features
Compact rectangular design, ■160 x 40 x 40 mmplastic housing ■Protection class IP40 ■Ambient temperature 0° C…+70 °C ■Diff use mode ■Max. range 180 cm ■Beam angle 60° ■Change of beam direction through ■movable sensor headAnalog or switching output ■LEDs indicate switching status /object ■detectedOperating range adjusted via ■potentiometer
698 Hans Turck GmbH & Co. KG ■ Tel. +49 (2 08) 49 52-0 ■ Fax +49 (208) 49 52-264
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w Wiring diagrams on page 832 ff d Dimension drawings on page 842 ff a Accessories on page 806 ff
The M18 detect small objects with pin-point accuracy. They are IP67 rated and thus also applicable in rough environ-ments.
The electronics is incorporated in a small 18 mm threaded barrel made of nickel-plated brass. Diff erent types are avail-able with operating ranges of 30 cm or 100 cm and with switching or Analog out-put. In order to avoid crosstalk, up to six devices can be synchronized simply by connecting the power supply. Alternate operation of several sensors is also pos-sible through external control.
Features
M18, threaded barrel ■Nickel-plated brass ■Protection class IP67 ■Ambient temperature -25…+70 °C ■Diff use mode ■Max. range 100 cm ■Beam angle 6° ■Switching or Analog output ■LED indicates the switching status ■Operating range adjusted via ■potentiometer and programming deviceSynchronizing/enable input ■
702 Hans Turck GmbH & Co. KG ■ Tel. +49 (2 08) 49 52-0 ■ Fax +49 (208) 49 52-264
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Ultrasonic sensors
Cylindrical design
w Wiring diagrams on page 832 ff d Dimension drawings on page 842 ff a Accessories on page 806 ff
The M18K detect small objects with pin-point accuracy. They are IP67 rated and thus also applicable in rough environ-ments.
The sensors come in a small 18 mm threaded barrel made of nickel-plated brass. Available are diff use mode devic-es with a max. range of 20 cm and ret-rorefl ective mode devices with a max. range of 70 cm. Both versions are either equipped with a PNP transistor or analog frequency output.
Features
M18K, threaded barrel ■Nickel-plated brass ■Protection class IP67 ■Diff use mode (RU/RUN) and ■retrorefl ective mode (RUR) devicesMax. range 70 cm ■Beam angle 6° ■Version with lateral emission (M18KS) ■Switching or analog frequency output ■LED indicates the switching status and ■teach modeAdjustments via teach input ■
706 Hans Turck GmbH & Co. KG ■ Tel. +49 (2 08) 49 52-0 ■ Fax +49 (208) 49 52-264
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w Wiring diagrams on page 832 ff d Dimension drawings on page 842 ff a Accessories on page 806 ff
The M30 detect small objects with pin-point accuracy and are hosted in a 30 mm threaded barrel made of nickel-plated brass. Available are versions with 30, 130, 300 and 600 cm range, switching output, switching and Analog output or with two switching outputs.
In order to avoid crosstalk, up to six RUC devices can be synchronized simply by connecting the power supply. Alternate operation of several sensors is also possi-ble via external control or synchronizing/enable input.
Features
M30 housing, threaded barrel ■Nickel-plated brass ■Protection class IP65 ■Ambient temperature -25…+70 °C ■Diff use mode ■Max. range 600 cm ■Beam angle 6° ■Switching or Analog output or two ■switching outputsLED indicates the switching status ■Operating range adjusted via ■potentiometer and programming deviceDevices with synchronizing/enable ■input 3GD version for explosion hazardous ■areas
712 Hans Turck GmbH & Co. KG ■ Tel. +49 (2 08) 49 52-0 ■ Fax +49 (208) 49 52-264
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Ultrasonic sensors
Cylindrical design
w Wiring diagrams on page 832 ff d Dimension drawings on page 842 ff a Accessories on page 806 ff