Spirax Sarco UTM20 Series - Wiring the Transmitter; 4 to 20 mA Output Wiring

IM-P505-02-US Issue 1
33
UTM20 Series Ultrasonic Transit-time Flowmeters
Fig. 35 Typical 4-20 mA interface using internal isolated 24V DC source
8.10 4 to 20 mA Output Wiring
The 4 to 20 mA output transmits an analog current signal
that is proportional to system flow rate. The 4 to 20 mA
output can be internally or externally powered and can
span negative to positive flow rates.
Both current loops are ISOLATED from DC GND or Power.
External Equipment
TB600
1
2
3
4
5
6
7
8
TP604
TP605
Test points provided for HART
monitoring equipment.
Note: HART IOUT3 signal
onlyavailable with HART module
option installed. HART modulation
only for 4-20 mA.
ISO_GND
IOUT1 Current #1 Output
IOUT2 Current #2 Output
HART IOUT3 Current #3 Output
800 Ohms
max.
800 Ohms
max.
800 Ohms
max.
Fig. 36
Typical 4-20 mA interface using external
isolated 24V DC source
ISO_GND
TB600
TP605
TP604
Black
Red
External Equipment
Note: 4 to 20 OUT 2 available with
Energy model only.
4 to 20 OUT 2 Current #2 Output
4 to 20 OUT 1 Current #1
+24V DC Source In
800 Ohms
max.
800 Ohms
max.
No Connect
No Connect
No Connect
(Acceptable wire sizes: 28 to 12 AWG)
Power Supply
Common
Power
Typ 24V DC