Dynasonics TFXM Series Ultrasonic Multi-Channel Flow Meter - Manual (Page 12)

Rev. 8/02 -1. 11- TFXM
ters only have one measuring channel, so transducers will only
be connected to the CH1 terminals. DTFXM2 flow meters
have two measuring channels, so transducers will be con-
nected to both the CH1 and CH2 terminals. See Figure 1.4.
Secure wires by tightening to between 0.5 and 0.6 Nm of
torque.
NOTE: The transducer cables carry low level signals. It is typi-
cally not recommended to add additional cable to the factory sup-
plied coaxial cables. If an exchange is not possible and additional
cable is to be added to the transducers, utilize RG59 (75 Ohm)
cable and splices. Ensure that both cables are of equal length. If
additional cable cannot be added in the field, contact the
Dynasonics factory to coordinate an exchange for the proper cable
length. Cables to 990 feet [ 300 meters ] are available.
Connect line power to the two screw terminals marked AC IN and
the one marked GROUND in the transmitter. See Figure 1.4.
Utilize the conduit hole on the left side of the enclosure for this
purpose. Use wiring practices that conform to local codes
(National Electric Code Hand book in the USA). Use only the
standard three wire connection. The ground terminal grounds the
instrument, which is mandatory for safe operation.
CAUTION: Any other wiring method may be unsafe or cause
improper operation of the instrument.
It is recommended not to run line power with other signal wires
within the same wiring tray or conduit.
NOTE: This instrument requires clean electrical line power. Do
not operate this unit on circuits with noisy components (i.e.
Fluorescent lights, relays, compressors, variable frequency drives,
etc.).
The TFXM can be operated from a 10-28 Vdc source, as long as it
is capable of supplying at least 8 Watts. DC power is connected
to the screw terminals labeled +DC IN and –DC IN on the terminal
block located on the left side of the enclosure. Observe proper
polarity in making these connections. It is recommended that a
1 A fuse be installed in DC connections to protect the TFXM and
PART 1 - TRANSMITTER INSTALLATION
Transmitter
Power
Connections
DC Power
Supply