TECHNICAL TERMS

Housing materials Cable Nominal sensing distance / S The application of the housing materials used is based on the technical specifications of the material and of the manufacturer. Even though RECHNER Sensors have far-reaching application experience concerning the use of different housing materials, the customer is responsible for checking in each case that the housing material is suitable for the application. For the standard models PVC- or PUR-cable are used. One has to take into consideration that the cable should not be moved with ambient temperatures below –5°C. PVC is not suitable for use in applications with oil-based liquids or with UV-radiation. PUR is not suitable for continuous contact with water. For special application areas silicone or PTFE cables are available.
n The characteristic value of a proximity sensor, without consideration of industrial production tolerances and variationsdue to temperature and voltages. Real sensing distance / S
r The sensing distance determined at +20 °C and rated voltage. Here the series variance is taken intoconsideration. Variation max. + 10 %. Reduction factors The reduction factors, as shown in the table on page 6, should be taken into consideration, for metals other than FE 360 or ST 37. Series- and parallel connection Repeat accuracy of the switching point It is possible to connect the proximity sensors in series or parallel. When considering this it must be taken into account that the voltage drops are added for series connection and the residual voltages for parallel connection. Under these circumstances it is advisable to operate a maximum of three sensors in a corresponding circuit. The variation of the switching point of two successive measurements at constant ambient conditions. Frequency of operating cycles The maximum damping and un-damping cycles of the proximity sensor within one second. To ascertain the frequency of operating cycles a pulse / break ratio of 1 : 2 is used as a basis, at S
n ½.Switching hysteresisThe difference between the switch-on and switch-off point of a proximity sensor, when approaching or moving away from the standard measuring plate. It is < 20% of the real sensing distance.Enclosure ratingIP 65: Protection against contact with voltage-carrying parts, protection against ingress of dust and water jet. IP 67: Protection against contact with voltage-carrying parts, protection against ingress of dust and protec- tion against ingress of water when the equipment is immersed in water, up to 1 m depths and for a period of 30 minutes.Temperature variationThe displacement of the switching point if the ambient temperature changes.
All specifications are subject to change without notice. (05/2004)

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