Badger Meter Dynasonics DFX Series, User Manual

Page: 25 / 48

Transmitter Installation
Page 25 August 2019 DPP-UM-00256-EN-03
4…20 mA Output Module
The 4…20 mA Output Module interfaces with most recording and logging systems by transmitting an analog current signal
that is proportional to system flow rate Configure the 4…20 mA ISO-MOD via jumper selections for an internally powered
( Figure 22 ) or externally powered ( Figure 23 ) module Do not exceed the maximum load for a particular supply voltage
See Figure 21
200
100
300
400
500
600
700
800
900
1000
1100
12 14 16 18 20 22 24 26 28
Supply Voltage (VDC)
Lo
op L
oad (
O
hms)
Operate in the
Shaded Regions
Supply Voltage - 7 VDC
0.02
= Maximum Loop Resistance
Figure 21: Maximum 4…20 mA loads
Internal Power Configuration
Verify that jumpers are in place at JP1 and JP2 on the module See Figure 22 In this configuration, the 4…20 mA output
is driven from a +24V DC source located within the DFX flow meter The 24V DC source is isolated from the DC ground
and earth ground connections within the DFX flow meter The module can accommodate loop loads up to 800 Ohms in
this configuration
OTEE:
N
The +24V internal supply, if configured to power the 4…20 mA output, shares a common ground with another
ISO-MOD (if installed) If another module is connected to earth ground, a ground loop may occur The solution to this
problem is to configure the 4…20 mA module for external power and use an external isolated supply to power the
4…20 mA loop
OUT (-)
IN (+)
I/O: 4-20 mA
P.N. D020-1045-100
ISO-MOD
JP2
JP1
INT PWR EXT PWR
Use Both
Jumpers
RTU/PLC
MONITOR
4-20 mA IN (+)
4-20 mA OUT (-)
Figure 22: Internally powered 4…20 mA