SwirlMaster FSS430, FSS450 VortexMaster FSV430, FSV450 | CI/FSS/FSV430/450-EN Rev. D  25 
 
 
Analog input 4 ... 20 mA 
An external pressure transmitter, an external temperature 
transmitter or a gas analyzer for a density signal can be 
connected onto the analog input (4 ... 20 mA). The analog 
input measures the current loop value. 
—  Temperature input for the return for power measurement 
—  Pressure input for pressure compensation for the flow 
measurement of gases and steam 
—  Concentration of gas for the net metering of methane 
(biogas) 
—  Density for calculating the mass flow 
 
Current input 
Terminals  ANALOG INPUT+ / ANALOG 
INPUT- 
Operating voltage  16 ... 30 V DC 
Input current  3.8 ... 20.5 mA 
Equivalent resistance  90 Ω 
 
 
Fig. 25:  Connection of transmitters at the analog input (example) 
1 Remote transmitter 
2 Power supply for the remote transmitter 
3 Cable entry for the analog input  4 FSS400 / FSV400 
5 Cable entry for the current output 
6 Power supply for FSS400 / FSV400 
 
 
 
 
HART 7 communication with remote transmitter 
Because the device is designed with two-wire technology, a 
pressure or temperature transmitter can also be connected to 
the power supply lead (4 ... 20 mA). 
The transmitter connected must run in HART burst mode. The 
device supports remote transmitters with HART 7 
communication. 
 
 
Fig. 26:  Connection of transmitters with HART communication 
(example) 
1 Power supply for the remote transmitter 
2 Power supply for FSS400 / FSV400 
3 Remote transmitter  4 FSS400 / FSV400 
5 Cable entry for the current output 
 
 
 
G11772
EXT.
METER +
P/N :
USE WIRING RATED
5ºC MIN. ABOVE MAX.
AMBIENT TEMPERATURE
+
–
TEST PWR/COMM
+
–
1
23
4
USE WIRING RATED
5ºC MIN ABOVE MAX
AMBIENT TEMPERATURE
P/N:XXXXXXXXXXXX
DIGITAL
OUTPUT+
DIGITAL
OUTPUT–
PWR / COMM.
TEST
EXT
METER+
+
–
ANALOG INPUT
NAMUR-YES
NAMUR-NO
+
-
+
-
3 5
4
1
2
6
G11773
EXT.
METER +
P/N :
USE WIRING RATED
5ºC MIN. ABOVE MAX.
AMBIENT TEMPERATURE
+
–
TEST PWR/COMM
+
–
1
23
4
USE WIRING RATED
5ºC MIN ABOVE MAX
AMBIENT TEMPERATURE
P/N:XXXXXXXXXXXX
DIGITAL
OUTPUT+
DIGITAL
OUTPUT–
PWR / COMM.
TEST
EXT
METER+
+
–
ANALOG INPUT
NAMUR-YES
NAMUR-NO
+
-
5
4
3
+
-
1 2