Samson 3738-20, Mounting And Operating Instructions

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10 EB 8390 EN
Article code
SSP
interface
10
9
3
12
B
A
13
C
15
St
2
4
6
11 7
8
1
5 16
14
Signal for solenoid
valve: V1 or V3
Power
Supply
Electronic limit switch
Actuator
1 AMR sensor with electronics
2 A/D converter
3 Microcontroller
4 Galvanic isolation
5 Galvanic isolation
6 Actuation of solenoid valve
7 Solenoid valve
8 Air capacity booster
9 Display
10 Rotary pushbutton (local operation)
11 LED for solenoid valve
12 Internal supply
13 NAMUR contact A (limit switch for fail-safe position)
14 NAMUR contact B (limit switch for operating position)
15 NAMUR contact C (signal on reaching target range during
partial stroke test)
16 NAMUR contact St (fault alarm contact)
Fig. 2: Schematic diagram – Type 3738-20-xxx1 4 00xxx000 Electronic Limit Switch with integrated
solenoid valve