Dynasonics TFXM Series Ultrasonic Multi-Channel Flow Meter - Manual (Page 13)

Rev. 8/02 -1. 12- TFXM
the battery source from damage should a fault occur. See the
Wiring Diagram located at Figure 1.4 .
Both AC and a 12 VDC battery power can be connected to the
TFXM to facilitate an uninterruptible power source to the flow me-
ter. The flow meter will operate on the AC power source until AC
power is interrupted—at that point the flow meter will continue to
operate on the battery until AC power is restored. In this configu-
ration the battery will not be trickle -charged by the TFXM. Batter-
ies are rated in Amp Hour capacity. Select a battery that can
maintain operation of the flow meter for the length of anticipated
AC power outages.
Example: The TFXM draws approximately 700 mA of current at
12 VDC. A 7 Amp Hour 12 Volt battery will be able to operate the
TFXM for approximately 7 Amp Hours / 0.7 Amps = 10 Hours.
As an alternate uninterruptible configuration, connect a battery to
the TFXM as the primary source of power and permanently con-
nect a trickle-charger to the battery. Ensure that the trickle-
charger is rated to output a minimum of 10 Watts.
PART 1 - TRANSMITTER INSTALLATION
Uninterruptible
Power
Configuration