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FC7x0
Wiring
SITRANS FC
Fig. 88: Passive pulse output connection with electronic counter
①
②
③
SITRANS FC
Fig. 89: Passive pulse output connection with electromechanical counter
①
②
③
13.4.5 Power supply
Alternating-current voltage (rms):
Power
supply
▪ Power supply
▪ Power frequency: 47 – 63 Hz
Direct-current voltage:
▪ Power supply
for option S2x (DNV GL 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
internal memory. In case of devices with display, the characteristic sensor values, such
supply failure
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
124 / 180
Pulse+
1
Pulse-
Passive pulse
Load resistance
Electronic counter
Pulse+
1
Pulse-
Passive pulse
Protective diode
Electromechanical counter
: 24 V
+20 % -15 % or 100 – 240 V
1)
AC
: 24 V
+20 % -15 % or 100 – 120 V
1)
DC
used accessory (e.g. cable glands).
tape).
A5E52748387-AA, 2023/09
2
3
2
3
+10 % -20 %
AC
+8,3 % -10 %
DC
±20 % under NE21 test conditions.
DC
Transmitter
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