Baker Hughes Panametrics AquaTrans AT600, Руководство пользователя

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Chapter 2. Clamp-on fixture and transducer installation
16 AquaTrans™ AT600 User’s manual
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 19.
2.2 Installing a CF-ES clamp-on fixture and transducer system
To use the AT600 flow meter on 0.5 to 2 in. (15 to 50 mm) pipes, the CF-ES clamp-on fixture must be used. UTXDR or
CF-LP transducers are available for installation in this fixture. Note the following specifications:
• UTXDR transducer: Use cable adapter p/n 704-1678-LF with the AT6 transducer cable,-40 to +120°C (-40 to
+248°F) temperatures, 4 MHz frequency
• CF-LP transducer: Use cable adapter p/n 210-410-LF with the AT6 transducer cable, up to 230°C (446°F)
temperatures, 4 MHz frequency.
Detailed installation instructions for this fixture and transducer are available in Panametrics document #916-082.
UPSTREAM
DOWNSTREAM
+1/4
circumference
-1/4
circumference