Samson 3738-20 Mounting And Operating Instructions page 16

Technical data
Electronic Limit Switch Type
Version
Safety ap- Safety-related end po-
proval sition monitoring
Emergency venting
Materials Housing
Housing cover
Cover gasket
Indicator wheel
Magnet material
Weight
Compliance
Switching function
Switching No response/no fault
contacts
Response/fault
indication
Hysteresis
Contacts Contact A
Limit switch for fail-safe
position (solenoid valve
de-energized)
Contact B
Limit switch for
operating position
(solenoid valve
energized)
Contact C
Signal when target
range reached during
partial stroke test
16
3738-20-xxx1400xxx000
With integrated solenoid valve
The limit switches are suitable for use in safety-instrumented
systems up to SIL 2 (single channel) and SIL 3 (redundant con-
figuration) according to IEC 61508. For further details, see
section 3.3.
See section 3.3
Die-cast aluminum EN AC-AlSi12(Fe) (EN AC-44300) acc. to
DIN EN 1706, powder paint coated
Computer
PU
Computer
Hard ferrite
Approx. 1.2 kg
·
NC contact
≥ 2.2 mA
≤ 1.0 mA
1 %
PTO (power to open): responds when the valve moves through
the switching contact towards the lower end position (P7)
PTC (power to close): responds when the valve moves through
the switching contact towards the upper end position (P8)
PTO (power to open): responds when the valve moves through
the switching contact towards the upper end position (P8)
PTC (power to close): responds when the valve moves through
the switching contact towards the lower end position (P7)
Signal for wire breakage according to DIN EN 60947-5-6
Responds when the valve reaches the PST target range*
* PST target range =
'PST step end' (P14) ± ½ 'PST tolerance band' (P15)
3738-20-xxx1000xxxx00
For external solenoid valve
Same as specifications of the
solenoid valve manufacturer
Approx. 1.0 kg
NO contact
≤ 1.0 mA
≥ 2.2 mA
EB 8390 EN