Page 4 of catalogue Flow sensors of Rechner Industrie-Elektronik GmbH

TECHNOLOGY • FUNCTION PRINCIPLE
The SW-600 series is a range of Flow Sensors according to the calorimetric measuring principle. This principle is based on the physical effect that flowing medium absorbs heat energy. These Sensors contain a heat source (RH) and a temperature dependent measuring resistor (RM1). A second measuring resistor (RM2) monitors the temperature of the medium and compensates the measuring value of the flow during variations of temperature. Measuring principle Fig. 1

RM1 Flow RH

RM2

The cooling of the sensor tip by the flowing medium is registered and electronically evaluated.

Demonstration of function Fig. 2

Heat removal
All specifications are subject to change without notice. (03/2006)

Flow The Series SW-600 offers a range of possibilities for which measuring values can be provided.e.g. increase or decrease of a determined limit value as an output signal. There is the „...S“ Version with galvanic separated digital output (NO) and the „...IL“ Version with a programmable analogue output and 2 digital outputs (NPN/PNP) for adjustable switching points (Smin or Smax) and hystereses.

For the connection diagrams and technical data please see page 9...17

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RECHNER Industrie-Elektronik GmbH • Gaußstraße 8-10 • D-68623 Lampertheim • Tel. (0 62 06) 50 07-0 • Fax (0 62 06) 50 07-36 • e-mail: info@rechner-sensors.de • www.rechner-sensors.de