NEN EN 50227 : 1997

Foreword
1 Scope
2 Normative references
3 Definitions
4 Classification
5 Characteristics
6 Product information
7 Normal service, mounting and transport conditions
8 Constructional and performance requirements
9 Tests
Figure 1 Example of a continuous characteristic of a
           proximity sensor
Figure 2 Example of 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

SHOULD BE READ IN CONJUNCTION WITH BS EN 60947-1 AND BS EN 60947-5-2. Applicable to proximity sensors connected for operating by a two-wire connecting conductor to the control input of a switching amplifier. This amplifier contains a d.c. source for supplying the control circuit and is controlled by the variable internal resistance of the proximity sensor.