© Siemens AG 2007

SIMATIC PXS sonar proximity switches Functionality and highlights

Function The sonar proximity switches only operate through the me-dium of air and can detect any objects that reflect ultrasound.They emit ultrasonic pulses cyclically. When an object reflects these pulses, the resulting echo is received and converted into an electrical signal. The incoming echo is detected in accor-dance with its intensity which, in turn, is dependent on the distance between the object and the sonar proximity switch.Sonar proximity switches operate according to the echo prop-agation principle, i.e. the time difference between the emit- ted pulse and the echo pulse is evaluated.The construction of the sensor causes the ultrasonic beam to be emitted in the shape of a cone. Temperature compensationThe proximity switches of compact ranges M30 K2, M30 K3 and M18 are fitted with industrial temperature sensors and a compen-sation circuit that equalizes changes in operating distances caused by temperature changes.SynchronizationIn compact ranges M30 K2, M30 K3 and M18, several devices can be synchronized with each other by simply interconnect- ing the synchronization outputs of the devices. Up to 10 de-vices can be synchronized (or 6 devices in the case of compact range 0). This allows the sensors to be mounted extremely close to each other in many cases without causing mutual interference.Programming with

Highlights

â–  Millimeter-accurate measurement â–  Color and material-independent, even transparent objects â–  Individual parameter setting â–  Small, compact housing â–  Very high degree of repeat accuracy â–  UL/CSA approvals â–  Sensors available for Ex Zone 2/22 â–  Insensitive to temperature, noise, light and water SONPROG

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Programming the devices of the compact ranges M18, M30 K2 and M30 K3

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Possible settings include:

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Operating range beginning and end

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Analog range beginning and end

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Switching hysteresis

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Mean value generation

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Multiplex mode
SIMATIC Sensors Form

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NO/NC contact switchoverSensors for Ex Zone 2/22The PXS800 sonar proximity switches are approved according to EU Guideline 94/9/EG (ATEX) Appendix VIII.The approval is for:
PXS100 Compact range 0, compact form 3SG16, sonar barrier PXS200 Compact range K21, compact range M30 K1, compact range M18S, compact form K08

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Gas EX II 3G EEx nA II T6 X and
PXS300 Compact range M30 K2, compact range M18, compact form K65

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Dust EX II 3D IP65 T 80 °C XThe functionality of the sonar proximity switches with ATEX approval is identical to that of the standard proximity switches. Product linesThe sonar proximity switches are organized in different prod-uct families in accordance with their technical version and de- sign:
PXS400 M30 K3 compact range PXS800 M18 ATEX compact range, M30 K3 ATEX compact range PXS900 Double-layer sheet monitoring 11