Dynasonics TFXL Clamp-On Ultrasonic Flow - Manual (Page 7)

06-TTM-UM-00158 8/2012 7
Upstream
Transducer
Downstream
Transducer
Up Blue/Red
Up White/Black
Down Blue/Red
Down White/Black
FIGURE Q.4 - REMOTE MOUNT CONNECTIONS
Q4 - STARTUP
INITIAL SETTINGS AND POWER UP
1) Apply power to the transmitter.
2) Verify that the signal strength is greater than 5.0.
3) Input proper units of measure and I/O data.
INTRODUCTION
GENERAL
The TFXL ultrasonic fl ow meter is designed to measure
the fl uid velocity of liquid within a closed conduit. The
transducers are a non-contacting, clamp-on type or clamp-
around, which will provide benefi ts of non-fouling operation
and ease of installation.
The TFXL family of transit time fl ow meters utilize two
transducers that function as both ultrasonic transmitters
and receivers. The transducers are clamped on the outside
of a closed pipe at a specifi c distance from each other. The
transducers can be mounted in V-Mount where the sound
transverses the pipe two times, W-Mount where the sound
transverses the pipe four times, or in Z-Mount where the
TOP VIEW
OF PIPE
W-Mount V-Mount Z-Mount
TOP VIEW
OF PIPE
TOP VIEW
OF PIPE
FIGURE 1.1 - ULTRASOUND TRANSMISSION
the sound crosses the pipe once. The selection of how
transducers are mounted on opposite sides of the pipe and
method is based on pipe and liquid characteristics which
both have an eff ect on how much signal is generated. The
fl ow meter operates by alternately transmitting and receiving
a frequency modulated burst of sound energy between the
two transducers and measuring the time interval that it takes
for sound to travel between the two transducers. The diff er-
ence in the time interval measured is directly related to the
velocity of the liquid in the pipe.
APPLICATION VERSATILITY
The TFXL fl ow meter can be successfully applied on a wide
range of metering applications. The simple-to-program trans-
mitter allows the standard product to be used on pipe sizes
ranging from ½ inch to 100 inches (12 mm to 2540 mm). A
variety of liquid applications can be accommodated:
ultrapure liquids sewage cooling water
potable water reclaimed water river water
chemicals plant effl uent others
Because the transducers are non-contacting and have no
moving parts, the fl ow meter is not aff ected by system pres-
sure, fouling or wear.
The DTTN transducer set is rated to a pipe surface tempera-
ture of 250° F (121° C). High temperature DTTH transducers
can operate to a pipe surface temperature of 350° F (177° C).
The DTTS series of small pipe transducers can be used to a
pipe surface temperature of 185° F (85° C) and the DTTC high
temperature small pipe transducers are rated for 250° F
(121° C).
The TFXL uses a low voltage DC power source that provides
electrical safety for the user. Removing the cover allows ac-
cess to all the meter connections and the computer interface
connection.
Non-volatile fl ash memory retains all user-entered confi gura-
tion values in memory indefi nitely, even if power is lost or
turned off .
The enclosure should be mounted in an area that is conve-
nient for servicing, calibration or for observation of the LCD
readout.
Mount the TFXL transmitter in a location that is:
~ Where little vibration exists.
~ That is protected from corrosive fl uids.
~ That is within the transmitters ambient temperature
limits.
~ That is out of direct sunlight. Direct sunlight may
increase transmitter temperature to above the
maximum limit.