OTE:
N
Transducer cables have two wire-color combinations For the blue and white combination, the blue wire is positive
(+) and the white wire is negative (–) For the red and black combination, the red wire is positive (+) and the black
wire is negative (–) The transducer wires are labeled to indicate which pair is upstream or downstream
4 Connect power to the screw terminal block in the transmitter using the conduit hole in the center of the enclosure Use
wiring practices that conform to local and national codes such as The National Electrical Code Handbook in the U S
ANY OTHER WIRING METHOD MAY BE UNSAFE OR CAUSE IMPROPER OPERATION OF THE TRANSMITTER.
OTE:
N
This transmitter requires clean electrical line power Do not operate this transmitter on circuits with noisy
components (such as fluorescent lights, relays, compressors, or variable frequency drives) Do not use step-down
transformers from high voltage, high amperage sources Do not to run signal wires with line power within the same
wiring tray or conduit
DC Power Connections
The transmitter may be operated from a 9…28V DC source, as long as the source supplies a maximum of 5 Watts of power
Connect the DC power to 9…28V DC In, power ground, and chassis ground, as in
OTE:
N
DC-powered transmitters are protected from major catastrophe with an internal 1 5 Amp SLO-BLO fuse If this fuse is
blown, the transmitter must be inspected and the fuse replaced at the factory
IMPORTANT
: A Class II DC power supply is required
Power
9…28V DC
Power
Common
Chassis
Ground
Switch
or
Circuit
Breaker
1
2
3
TB400
External Equipment
Power Supply (9 . . . 28V DC)
Power Supply (0V)
Chassis Ground
Figure 19: DC power connections
4…20 mA Output Wiring
The 4…20 mA output transmits an analog current signal that is proportional to system flow rate The 4…20 mA output can
be internally or externally powered and can span negative to positive flow rates Set up the current range and scaling in the
Setup > Input/Output > Current Output
menu See
“Setup > Input/Output >Current Output” on page 25
for details
DC-powered transmitters use the DC power supply voltage to drive the current loop The current loop is not isolated from DC
ground or power
TB600
External Equipment
1
2
3
4
24V DC
(42 mA) max.
800 Ohms max.
Current Output
TB600
External Equipment
1
2
3
4
No Connect
800 Ohms max.
Current Output
24V DC (30V DC max.)
Figure 20: Typical 4 . . . 20 mA interface using internal isolated 24V DC source
Figure 21: Typical 4 . . . 20 mA interface using external isolated 24V DC source
Wiring the Transmitter
Page 14
May 2021
TTM-UM-02537-EN-06
