Dynasonics TFXP Series Transit Time Ultrasonic Flow Meter - Manual (Page 19)

Rev. 5/09
- 2.1 - TFXP
The transducers that are utilized by the TFXP contain piezoelectric
crystals for transmitting and receiving ultrasonic signals through
walls of liquid piping systems. DTTN and DTTH transducers are
relatively simple and straightforward to install, but spacing and
alignment of the transducers is critical to the system's accuracy and
performance. Extra care should be taken to ensure that these
instructions are carefully executed. DTTS and DTTC, small pipe
transducers, have integrated transmitter and receiver elements that
eliminate the requirement for spacing measurement and alignment.
Mounting of the DTTN/DTTH clamp-on ultrasonic transit time
transducers is comprised of three steps:
1. Selection of the optimum location on a piping system.
2. Entering the pipe and liquid parameters into either the
(ULTRALINK™) software utility or keying the parameters into
the TFXP keypad. The ULTRALINK™ software utility or the
TFXP firmware will calculate proper transducer spacing based
on these entries.
3. Pipe preparation and transducer mounting.
TFXP transmitters with an RTD ISO-MOD module installed require
either one or two RTDs to measure heat flow (one RTD) or heat
usage (two RTDs). The Dynasonics flow meter utilizes 1,000 Ohm,
three-wire, platinum RTDs in two mounting styles. Surface mount
RTDs are available for use on well insulated pipe. If the area where
the RTD will be located is not insulated, inconsistent temperature
readings will result and insertion (wetted) RTDs should be utilized.
Instructions for the installation of the RTDs begin on page 2.18.
PART 2 - TRANSDUCER & RTD INSTALLATION
General