Dynasonics TFXL Clamp-On Ultrasonic Flow Manuel d'utilisateur télécharger pdf (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  ow meter is designed to measure

the  uid velocity of liquid within a closed conduit. The

transducers are a non-contacting, clamp-on type or clamp-

around, which will provide bene ts of non-fouling operation

and ease of installation.

The TFXL family of transit time  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 speci 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 e ect on how much signal is generated. The

 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 di er-

ence in the time interval measured is directly related to the

velocity of the liquid in the pipe.

APPLICATION VERSATILITY

The TFXL  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 e uent others

Because the transducers are non-contacting and have no

moving parts, the  ow meter is not a 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  ash memory retains all user-entered con gura-

tion values in memory inde nitely, even if power is lost or

turned o .

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  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.

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Dynasonics TFXL Clamp-On Ultrasonic Flow Manuel d'utilisateur Page 7

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