IEC 60947-5-6:1999

FOREWORD
1 Scope
2 Normative references
3 Definitions
4 Classification
5 Characteristics
    5.1 Control input of the switching amplifier
    5.2 Interaction between proximity sensor and
          switching amplifier
    5.3 Continuous characteristic
    5.4 Discontinuous characteristic
    5.5 Switching current difference
    5.6 Line resistance
    5.7 Insulation resistance
6 Product information
    6.1 Proximity sensors
    6.2 Switching amplifiers
7 Normal service, mounting and transport conditions
    7.1 Normal service conditions
    7.2 Connection identification and marking
    7.3 Conditions during transport and storage
    7.4 Electromagnetic compatibility (EMC)
8 Constructional and performance requirements
9 Tests
    9.1 Switching amplifier
    9.2 Proximity sensor
    9.3 Results to be obtained
    9.4 Verification of the electromagnetic
          compatibility
Figure 1 - Example of a continuous characteristic of a
           proximity sensor
Figure 2 - Example of a discontinuous characteristic of
           a proximity sensor
Figure 3 - Control input of the switching amplifier
Figure 4 - Characteristics of proximity sensor in
           the high impedance state
Figure 5 - Characteristics of proximity sensor in the
           low impedance state
Table 1 - Classification of proximity switches
Table 2 - Connection and wiring identification

Applies to proximity sensors connected for operation by a two-wire connecting cable to the control input of a switching amplifier. The switching amplifier contains a d.c. source to supply the control circuit and is controlled by the variable internal resistance of the proximity sensor. These devices can be used in an explosive atmosphere if they also comply with IEC 60079-11.