Badger Meter Dynasonics DFX Series, User Manual

Page: 23 / 48

Transmitter Installation
Page 23 August 2019 DPP-UM-00256-EN-03
J3
J4
J2
JP1
DC Power
Connections
12 to 28 VDC
7 Watts Maximum
Figure 17: DC power connection
Multiple Meter Installations
The DFX flow meter contains a provision for synchronizing multiple DFX flow meters together Synchronization is required
when more than one DFX flow meter is mounted on a common pipe or header system If the meters are not synchronized, a
phenomena called “cross-talk” can occur between meters, which can lead to erroneous readings or no readings at all
Cross-talk results from the small differences in transmitted frequency generated from two or more different ultrasonic
flow meters By synchronizing the transmitted ultrasonic energy, cross-talk caused by differences in transmitted frequency
is eliminated
The DFX flow meter synchronization circuit is designed to interconnect up to four DFX flow meters over a cable length of 100
feet (30 meters) Use 20-22 AWG twisted-pair shielded interconnection wire for this purpose See Figure 18
JP1/JP2
Connections
115/230
VAC
J4
J3
J2
9-28 VDC
9-28 VDC
4 3
2 1
2 1
2 1
2 1
2 1
Fuse (5x20mm)
AC: 0.25 A/250V Delay
DC: 1.0 A/250V Delay
Receive Transmit
RED BLK
BLU CLR
RED BLK
BLU CLR
EXT SYNC
SYNC SELECT
INT
EXT
GND
AC
DC EARTH
EARTH
GND
L1 L2
+V
Synchronization
Selection
Twisted Pair
Shield
(Connect one end only to earth ground)
Figure 18: Meter synchronization detail
To Synchronize Multiple Meters
1 Remove power from the DFX flow meters
2 Daisy-chain connect the
EXT
ernal
SYNC
hronization and GND terminal blocks together between the meters to be
synchronized, using the twisted-pair cable described previously The terminal block is located on the circuit board that is
mounted on the door of the meter’s monitor See Figure 15 on page 21 or the Wiring Diagram inside the door of the
DFX monitor
3 At a single point, connect the shield drain wire from the interconnection cable to earth ground
4 Configure the SYNC SELECT jumpers on the DFX flow meters One DFX flow meter should be configured for INT and the
remaining units configured for EXT (see Figure 19 )
5 Apply power to the DFX system