GE AquaTrans AT600 - 2.1.4 Transducer Spacing: >320 mm, Traverses=1, Fixtures=2

AquaTrans™ AT600 User’s Manual 19
Chapter 2. Clamp-On Fixture and Transducer Installation
2.1.4 Transducer Spacing >320 mm, Traverses = 1, Fixtures = 2
For a one traverse installation with a calculated transducer spacing of >320 mm for a 1 MHz or 0.5 MHz
transducer, two clamp-on fixtures are installed on opposite sides of the pipe. To install this configuration,
refer to Figure 21 below and complete the following steps:
1. Mark a straight line parallel to the pipe centerline on the top of the pipe (i.e., the 12 o’clock position).
2. Use a band tape to measure the circumference of the pipe. Then, mark two additional lines on the
pipe parallel to the first line. Locate these lines 1/4 of the way around the pipe in each direction from
the original line (i.e., at the 3 o-clock and 9 o’clock positions).
3. Install the four mounting straps on the pipe with a spacing of about 12 in. (30 cm) between each pair
of straps. Then, mark a fixture position on each of the straight lines, using the band tape as a
reference point.
4. Hold one clamp-on fixture, with two transducers and one cable, on the pipe between the pair of
downstream straps and along one of the lines marked in step 2. Then, move the two downstream
straps onto the ends of this clamp-on fixture. Tighten the strap screws and verify that the straps
remain on the ends of the fixture.
5. Hold the remaining (empty) clamp-on fixture along the line on the opposite side of the pipe from the
first fixture and between the upstream pair of straps. Then, move the two upstream straps onto the
ends of this clamp-on fixture. Tighten the strap screws and verify that the straps remain on the ends
of the fixture.
6. Set the spacing between the two transducers to the value calculated by the meter as follows:
a. Loosen the fixture rails and rotate the rails so the transducers are in view.
b. Remove the upstream transducer from the first fixture (see Figure 21 below). Disconnect the
transducer cable and route the cable into the second fixture.
c. Install the upstream transducer in the second fixture, and reconnect the transducer cable.
d. Locate the upstream transducer at the zero position of the second fixture, and then move the
downstream transducer to the required position on the first fixture. If you are using solid
couplant, apply it to both transducer faces. Then, rotate the transducers back onto the rail
Figure 21: 1 Traverse Installation for Transducer Spacing >320 mm
7. Your clamp-on fixture and transducer installation is now complete. To wire your AT600 flow meter,
proceed to “Wiring the AT600 Electronics” on page 23.
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