strength. Clamp the transducer at the position where the highest signal strength is observed. A signal strength between
5…98 is acceptable.
The factory default signal strength setting is five. However there are many application-specific conditions that may
prevent the signal strength from attaining this level. A minimum signal strength of five is acceptable as long as this signal
level is maintained under all flow conditions.
On certain pipes, a slight twist to the transducer may cause signal strength to rise to acceptable levels. Certain pipe and
liquid characteristics may cause signal strength to rise to greater than 98. The problem with operating this transmitter with
very high signal strength is that the signals may saturate the input amplifiers and cause erratic readings. Strategies for
lowering signal strength would be changing the transducer mounting method to the next longest transmission path. For
example, if there is excessive signal strength and the transducers are mounted in a Z-Mount, try changing to V-Mount or
W-Mount. Finally, you can also move one transducer slightly off-line with the other transducer to lower signal strength.
8. Secure the transducer with a stainless steel strap or other fastener.
Mounting Rail System Installation for DTTR
For remote flow DTTR transducers with outside diameters between 2…10 inches (50…250 mm) , the rail mounting kit aids
in installation and positioning of the transducers. Transducers slide on the rails, which have measurement markings that are
viewable through the sight opening.
1. Install the single mounting rail on the side of the pipe with the stainless steel bands provided. Do not mount it on the top
or bottom of the pipe. On vertical pipe, orientation is not critical. Check that the track is parallel to the pipe and that all
four mounting feet are touching the pipe.
2. Slide the two transducer clamp brackets toward the center mark on the mounting rail.
3. Place a single bead of couplant, approximately 1/2 inch (12 mm) thick, on the at face of the transducer.
See Figure 12 on page 20.
4. Place the rst transducer in between the mounting rails near the zero point on the scale. Slide the clamp over the
transducer. Adjust the clamp and transducer so the notch in the clamp aligns with the zero on the scale. See Figure 23.
5. Secure with the thumb screw. Check that the screw rests in the counter bore on the top of the transducer. (Excessive
pressure is not required. Apply just enough pressure so that the couplant lls the gap between the pipe and transducer.)
6. Place the second transducer in between the mounting rails near the dimension derived in the transducer spacing section.
Read the dimension on the mounting rail scale. Slide the transducer clamp over the transducer and secure with the
thumb screw.
Figure 22: Mounting rail system for DTTR
Mounting Track Installation for DTTN/DTTH
A convenient transducer mounting track can be used for pipes that have outside diameters between 2…10 inches
(50…250 mm) and for DTTN/DTTH transducers. If the pipe is outside of that range, mount the transducers separately.
1. Install the single mounting rail on the side of the pipe with the stainless steel bands provided. Do not mount it on the top
or bottom of the pipe. On vertical pipe, orientation is not critical. Check that the track is parallel to the pipe and that all
four mounting feet are touching the pipe.
2. Slide the two transducer clamp brackets toward the center mark on the mounting rail.
3. Place a single bead of couplant, approximately 1/2 inch (12 mm) thick, on the at face of the transducer.
See Figure 12 on page 20.
4. Place the rst transducer in between the mounting rails near the zero point on the scale. Slide the clamp over the
transducer. Adjust the clamp and transducer so the notch in the clamp aligns with the zero on the scale. See Figure 23.
5. Secure with the thumb screw. Check that the screw rests in the counter bore on the top of the transducer. (Excessive
pressure is not required. Apply just enough pressure so that the couplant lls the gap between the pipe and transducer.)
Transducer Installation
Page 24 April 2016TTM-UM-00369-EN-03
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