Dynasonics TFXM Series Ultrasonic Multi-Channel Flow Meter - Manual (Page 6)

Rev. 8/02 -1. 5- TFXM
PART 1 - INTRODUCTION
The TFXM ultrasonic flow meter is designed to measure the fluid
velocity of liquid within closed conduit. The transducers are a
non-contacting, clamp-on type, which will provide benefits of non-
fouling operation and ease of installation.
TFXM transit time flowmeters utilize two transducers that function
as both ultrasonic transmitters and
receivers. The transducers are
clamped on the outside of a
closed pipe at a specific distance
from each other. The transducers
can be mounted in V-mode where
the sound transverses the pipe
two times, W-mode where the
sound transverses the pipe four
times, or in Z-mode where the transducers are mounted on
opposite sides of the pipe and the sound crosses the pipe once.
This selection is based on pipe and liquid characteristics. The
flowmeter operates by alternately transmitting and receiving a
frequency modulated burst of sound energy between the two
transducers (contrapropogation) and measuring the time interval
that it takes for sound to travel between the two transducers. The
difference in the time interval measured is directly related to the
velocity of the liquid in the pipe.
The TFXM flow meter can be successfully applied on a wide
range of metering applications. The simple to program transmitter
allows the standard product to be used on pipe sizes ranging from
2 - 100 inch [ 50 - 2540 mm ] pipe. A variety of liquid applications
can be accommodated: ultrapure liquids, potable water,
chemicals, raw sewage, reclaimed water, cooling water, river
water, plant effluent, etc. Because the transducers are non-
contacting and have no moving parts, the flow meter is not
affected by system pressure, fouling or wear. Standard DTTN
transducers are rated to 300
?
F [150
?
C]. Temperatures to 450
?
F
[230
?
C] can be accommodated with Series DTTH transducers.
Please consult the Dynasonics factory for assistance.
General
Application
Versatility