Capacitive Sensors - RECHNER - #5

Text version of the page

All specifications are subject to change without notice. (05/2010) RECHNER Industrie-Elektronik GmbH • Gaußstraße 8-10 • D-68623 Lampertheim • Tel. +49 (0) 62 06 50 07-0 • Fax +49 (0) 62 06 50 07-20 • email info@rechner-sensors.de • www.rechner-sensors.com TECHNOLOGY Wiring of the capacitive sensors should be routed separately or screened from heavy conductor lines, as in extreme cases inductive peak voltages can destroy the sensors despite the integrated protective circuit. Screened cable or twisted lines are recommended, especially for longer cable runs > 5 m. Direct control of electric light bulbs is to be avoided, because during the switch-on moment cold current is many times the rated current and can destroy the output stage of the sensor. Units with strong near field power, e. g. high power walkie-talkies, or noise sources in the lower frequency range, e.g. long, middle or short wave transmitters should not be operated close to the sensors or additional measures have to be taken in order to eliminate incorrect operation. 2- and 3-wire sensors with binary output can be used in series or parallel connection, similar to mechanical contacts. The type-typical voltage drop and the residual voltage Ud , which must be multiplied in accordance with the number of sensors for series connection, must be noted. In the case of parallel connection of sensors with thyristor output, the first switched output takes over the total load current. 2 wire AC / DC 3 wire DC NPN 3 wire DC PNP Series connection Parallel connection