Regal RH40, User Manual

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conditions will make measurement very difficult. Whenever possible, try to avoid these kinds of
pipes. If lined pipes must be used, try our plug-in transducers that are installed
permanently to the pipe by drilling holes on the pipe as liquid is flowing inside.
Table A
L up
L dn
L up
L dn
L up
L up
L up
L dn
L dn
L dn
Piping Configuration
and
Transducer Position
Upstream
Dimension Downstream
Dimension
L dn
x Diameters
L up
x Diameters
10D
5D
10D
10D
12D
20D
20D
5D
5D
5D
5D
5D
L up
L dn
30D
5D
L up
L dn
§3.2 Transducer Installation
The transducers used by the RH40 Series Ultrasonic Flow Meter are made out of piezoelectric crystals for
both transmitting and receiving ultrasonic signals through the wall of liquid-piping system. These
excellent quality materials deliver high accuracy. The measurement is obtained by calculating the travel-
time difference of the ultrasonic signals. Since the difference is very small, the spacing and the alignment
of the transducers are critical factors to the accuracy of the measurement and to the performance of the
system. Meticulous care should be taken for the installation of the transducers.