5
Suggested Transducer Spacing
Transducer Set Up & Mounting
As noted, this quick install guide is using the V method as our installation method.
The V method is considered the standard installation method (See Figure 3). The
V method is usually more accurate and works well on pipe diameters ranging
from approximately 1 inch to 8 inches (25 mm to 200 mm). With all installation
types, the V method requires proper installation of the transducer, contact on the
pipe at the pipe’s centerline and equal spacing on either side of the centerline.
For placement of the transducers for the V method, we recommend you do the following:
1. Make contact on the pipe at the pipes centerline. See “Transducer Space” in Figure 4.
2. Make two marks on the pipe for the correct transducer spacing from “Step 8. Transducer Spacing” on the display
(See p. 4) Calipers provide the best measurement. Note: start at the standard suggested transducer spacing, but this
will most likely need to be adjusted.
3. Then coat the bottoms of the each transducer with ultrasonic mounting grease. Note: you will need to wear gloves.
4. One at a time, mount the transducer to the pipe at the marks you made. Observe the Upstream / Downstream
labels on the transducers (see Figure 3). Note: The sensors have groves to place the pipe strap.
5. Tighten the first clamp firmly. Repeat the process with the second transducer, but do not tighten the hose clamp all the
way on second transducer.
For more detailed installation information, see Chapter 6 of the InnovaSonic 207i instruction manual. Download at
sierrainstruments.com/downloads/207i.
Confirm Transducer Mounting and Spacing
Once your transducers are close to the correct spacing, you will see the waveform of the returning ultrasonic
signal on the display in the “Transducer Spacing” menu (see Step 8). It will take several seconds for the gain to
adjust to the range of the returned signal. Wait for the gain to adjust until you see a returned signal as below. The
TOM / TOS should be as close to 100% as possible (See Figure 5). You can also use the MeterFit™ app on your
Smart Interface Portal (SIP) software. Download software at sierrainstruments.com/downloads/207i.
The line identifying the beginning of the waveform (“the arrival marker”) should be between the two goal posts \
to verify the transducers have the correct spacing. Adjust the transducers closer or further apart so that the arrival
marker is between the goal posts at the beginning of the wave from. If the transducers are not at the correct
spacing, you will need to move the transducer closer or further apart to make the arrival marker line be within the
goal post marks at the bottom of the wave form. Once the arrival marker line is between the goal posts, tighten
the clamp on the second transducer. Make sure to maintain a layer of ultrasonic grease between the transducer
and the pipe while adjusting the spacing (see Figure 6).
Figure 3. V Method for Transducer
Placement
Figure 4. Transducer Spacing
Watch the How to Install & Operate
video at sierrainstruments.com/207i-how-to