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Transmitter
SITRANS FC
Fig. 103: Passive pulse output connection with electronic counter
①
②
③
SITRANS FC
Fig. 104: Passive pulse output connection with electromechanical counter
①
②
③
13.4.5 Power supply
Power
Alternating-current voltage (rms):
supply
▪ Power supply
▪ Power frequency: 47 – 63 Hz
Direct-current voltage:
▪ Power supply
1)
for option S2x (DNV GL approval) supply voltage is limited to 24 V; in addition NE21
testing indicates a tolerable area of 24 V
Power
P ≤ 10 W (including sensor)
consumption
Power
In the event of a power failure, the flow meter data are backed up on a non-volatile
supply failure
internal memory. In case of devices with display, the characteristic sensor values, such
as no-
minal diameter, serial number, calibration constants, zero point, etc. and the error history
are also stored on a microSD card.
13.4.6 Connecting power supply and external devices
Risk of sparking and damage to the flow meter due to incorrect sealing
WARNING
▶ In case of metric cable entry ensure appropriate IP rating and suitability of O-ring of
▶ In case of NPT cable entry ensure appropriate sealing measures (e.g. use of sealing
Pulse+
1
Pulse-
Passive pulse
Load resistance
Electronic counter
Pulse+
1
Pulse-
Passive pulse
Protective diode
Electromechanical counter
1)
: 24 V
+20 % -15 % or 100 – 240 V
AC
1)
: 24 V
+20 % -15 % or 100 – 120 V
DC
used accessory (e.g. cable glands).
tape).
2
3
3
2
+10 % -20 %
AC
+8,3 % -10 %
DC
±20 % under NE21 test conditions.
DC
A5E52748375-AA, 2023/09
FC6x0
Wiring
137 / 194
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