Dynasonics TFX Ultra Transit Time Flow Meters Manuel d'utilisateur télécharger pdf (Page 9)

INTRODUCTION

General

This transit time ultrasonic flow meter is designed to measure the fluid velocity of liquid within a closed conduit. The

transducers are a non-contacting, clamp-on type or clamp-around, which will provide benefits of non-fouling operation and

ease of installation.

TOP VIEW

OF PIPE

W-Mount V-Mount Z-Mount

TOP VIEW

OF PIPE

TOP VIEW

OF PIPE

Figure 3: Ultrasound transmission

This family of transit time flow 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 specific 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 transducers are mounted on opposite sides of the pipe and the sound crosses the pipe once.

The selection of mounting method is based on pipe and liquid characteristics which both have an effect on how much signal

is generated. The flow 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 difference in the time interval measured is directly related to the velocity of the liquid in the pipe.

Application Versatility

This 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 1/2 …100 inches (12…2540 mm)*. A variety of liquid

applications can be accommodated:

ultrapure liquids cooling water potable water river water chemicals

plant effluent sewage reclaimed water others

Because the transducers are non-contacting and have no moving parts, the flow meter is not affected by system pressure,

fouling or wear. Standard transducers, DTTN and DTTL are rated to a pipe surface temperature of –40…250° F (–40…121° C).

DTTS small pipe transducers are rated from –40…185° F (–40…85° C). The DTTH high temperature transducers can operate

to a pipe surface temperature of –40 …350° F (–40…176° C) and the DTTC small pipe high temperature transducer will

withstand temperature of –40…250° F (–40…121° C).

OTE:N *All 1/2…1-1/2 in. small pipe transducers and 2 in. small pipe tubing transducer sets require the transmitter

be configured for 2 MHz and use dedicated pipe transducers. DTTL transducers require the use of the 500 kHz

transmission frequency. The transmission frequency is selectable using either the software utility or the

TFX Ultra keypad.

CE Compliance

The transmitter can be installed in conformance to CISPR 11 (EN 55011) standards. See the CE compliance drawings in the

APPENDIX of this manual.

INTRODUCTION

Page 9 March 2014

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Dynasonics TFX Ultra Transit Time Flow Meters Manuel d'utilisateur Page 9