Transducer
Mount Mode
Transducer
Pipe Material
Pipe Size
W-Mount
DTTSU
Plastic (all types)
0 .5…0 .75" (12 .7…19 mm)
Carbon Steel
Stainless Steel
Copper
Galvanized
Not recommended
V-Mount
Plastic (all types)
0 .75…2 .4" (19…61 mm)
Carbon Steel
Stainless Steel
Copper
Galvanized
0 .5…2 .4" (12 .7…61 mm)
Table 3: Transducer mounting modes for DTTSU
DTTL transducers may also be advantageous on pipes between 4…24 inches if there are less quantifiable complicating
aspects, such as sludge, tuberculation, scale, rubber liners, plastic liners, thick mortar, gas bubbles, suspended solids,
emulsions, or pipes that are partially buried where a V-mount is required or desired .
The DTTR, DTTN, DTTH and DTTL transducers must be properly oriented and spaced on the pipe to provide optimum
reliability and performance . On horizontal pipes, when Z-Mount is required, the transducers should be mounted 180 radial
degrees from one another and at least 45 degrees from the top-dead-center and bottom-dead-center of the pipe .
See
“Z-Mount Installation” on page 24
. On vertical pipes the orientation is not critical .
The best accuracy is achieved when transducer spacing is exactly what the flow meter calculates, so the calculated spacing
should be used if signal quality is satisfactory . If the pipe is not round, the wall thickness not correct or the actual liquid
being measured has a different sound speed than the liquid programmed into the transmitter, the spacing can vary from
the calculated value . If that is the case, the transducers should be placed at the highest signal level observed by moving the
transducers slowly around the mount area .
OTEE:
N
Transducer spacing is calculated on ideal pipe . Ideal pipe is almost never found so the transducer spacing distances
may need to be altered . An effective way to maximize signal quality is to configure the display to show signal quality,
fix one transducer on the pipe and then starting at the calculated spacing, move the remaining transducer small
distances forward and back to find the maximum signal quality point .
TOP VIEW
OF PIPE
W-Mount
V-Mount
Z-Mount
TOP VIEW
OF PIPE
TOP VIEW
OF PIPE
Figure 16: Transducer mounting modes for DTTR, DTTN, DTTL and DTTH
45°
45°
YES
YES
45°
45°
Flow Meter
Mounting Orientation
DTTR, DTTN, DTTL and DTTH Transducers
Top of
Pipe
Flow Meter
Mounting Orientation
DTTSU Transducers
YES
45°
45°
45°
45°
YES
TOP OF
PIPE
Figure 17: Transducer orientation for horizontal pipes
Transducer Installation
Page 21
November 2016
HYB-UM-00090-EN-04