CiDRA SONARtrac GVF-100 - Manual (Page 23)

Copyright © 2006 CiDRA Corporation Page 7-5
20675-01 Rev 02
1 2 3 4 5 6 7 8 9
Sensor band assembly
Wrap the sensor band around the pipe and slide the alignment pins on
the attachment rail through their mating holes on the opposite
attachment rail. If the process pipe has a welded seam, align the gap
between the sensor attachment rails along the pipe weld seam. Final
positioning can be made after the sensor screws have been started.
Note:
When installing the sensor band keep in mind the requirement
for transmitter connector socket assembly orientation as described in
Section 7.6. If necessary, due to cover installation constraints, wrap
the sensor band over the weld seam.
Carefully start threading the screws into their screw holes (avoid cross
threading) by using the hex driver until each screw is engaged about 2
turns. Once all screws are engaged make final positioning of the
sensor assembly with respect to pipe weld seam or desired orientation
on the pipe. The following table provides guidance for selecting the
proper hex tool and spacer gauge.
Table 4 Gauge Block and Screw Size
Start with the center most screw and tighten screws, alternating from
side to side, 3 - 4 turns at a time. Refer to the following figure for the
screw tightening sequence. Note: Repeat the tightening sequence
only until the Belleville disc springs on the screws begin to compress.
The sensor screw stack up assembly is illustrated in Figure 8.
Figure 7 Sensor Band Screw Tightening Sequence
Sensor Band P/N
Spacer Gauge
P/N
Socket Head Screw
Hex Size (inch)
Band Attachment Rail
Size (Ref)
20380- ALL SIZES 20143-01 7/64 1/8 x 3/8
20409- ALL SIZES 20143-02 7/64 1/8 x 3/8
20690- ALL SIZES 20143-04 5/32 1/4 x 1/2
20686- ALL SIZES 20143-04 5/32 1/4 x 1/2