CiDRA GVF-100 Gas Volume Fraction Monitoring System User Manual

Page 22

Page 7-5

20639-01 Rev 03

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) 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 3

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.

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