The DTT series transducers are non-invasive, clamp-on devices that are placed on the outside of a pipe. Proprietary circuitry allows this product to be used on both metal and plastic pipes containing relatively clean liquids as well as those with suspended solids or entrained gases. Models are available for general purpose, submersible or hazardous area applications.
Operating Principle. Each transducer utilizes a piezoelectric crystal to transmit ultrasound through a pipe wall and into a flowing liquid. The ultrasonic signal is reflected from suspended solids or entrained gases drawn out of solution by hydraulic disturbances such as a 90° elbow. (This unit can measure the flow rate of clean liquids by mounting the transducers 1 to 3 pipe diameters downstream of the 90° elbow.) A second transducer receives the reflected sound and the TFXL series meter's circuitry compares the transmitted and received frequencies. If the liquid is moving, a frequency (phase/Doppler) shift occurs which is proportional to fluid velocity.
Clamp-on transducers that are suitable for pipes 2 inches and larger, with a temperature range of -40…250° F (-40…121° C). The upper end of the pipe range varies with ultrasonic properties of liquids and pipes. For water in PVC pipe, DTTL transducers are recommended on pipes 24 inches or larger.
Transducers include stainless steel straps and an optional rail kit is available to promote easier installation. Transducers can be ordered with flexible armored conduit.
Features:
For general purpose, submersible or hazardous area applications
Standard (194 and 250ºF) and High Temperature (350ºF) models available
500 kHz and 1.0 MHz
Includes mounting hardware and silicone acoustic couplant