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Power supply
11.2 Power supply
Alternating-current voltage (rms):
Power supply
▪ Power supply
▪ Power frequency: 47 – 63 Hz
Direct-current voltage:
▪ Power supply
for option S2x (Marine approval) supply voltage is limited to 24 V; in addition NE21
1)
testing indicates a tolerable area of 24 V
P ≤ 10 W (including sensor)
Power consumption
In the event of a power failure, the flow meter data are backed up on a non-volatile
Power supply failure
internal memory. In case of devices with display, the characteristic sensor values, such
as nominal diameter, serial number, calibration constants, zero point, etc. and the error
history are also stored on a microSD card.
Galvanic isolation
All circuits for inputs, outputs and power supply are galvanically isolated from each other.
11.3 Cable specifications
For remote type devices, a connecting cable has to be used to connect the sensor to the
transmitter. The device specifications, stated in this document, are valid only if one of the
original Siemens connecting cables is used.
Cable length limitations to be considered:
Cable type
Standard connecting cable
Fire retardant connecting cable
Cables longer than 30 m must be ordered as separate item. For this purpose please
consult our Siemens Service team.
If Marine option S22...S27 is ordered, a Marine certified cable will be delivered.
: 24 V
+20 % -15 % or 100 – 240 V
1)
AC
: 24 V
+20 % -15 % or 100 – 120 V
1)
DC
DC
Option code
Maximum length to
keep the specification
L5x/L6x
30 m
L7x/L8x
30 m
A5E52748387-AA, 2023/09
+10 % -20 %
AC
+8.3 % -10 %
DC
± 20 % under NE21 test conditions.
Maximum allowable
length in hazardous
areas
171 m
95 m
FC7x0
Transmitter
85 / 180
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