Kistler-Morse KM Microcell Bolt-On - Manual (Page 19)

Note
Ground the cable shield only at the signal
processor.
INSTALLING INSULATION FOR
OUTDOOR VESSELS (OPTIONAL)
The sun affects the performance of an outdoor,
bolt-on sensor system. The sun’s radiation
heats the support metal unevenly, producing
stresses in the supports that are unrelated to the
weight of material in the vessel. The Microcell™
system minimizes errors associate with
sun-induced stressed in several ways.
A. Microcell™ sets and instrumentation of all
support legs allow the system to subtract
bending stresses resulting from uneven heating
of supports.
B. Microcell™ rosette arrays, where
applicable, allow the system to subtract
tensile/compressive stresses resulting from the
heating of supports.
This configuration of the Microcell™ system
minimizes errors associated with sun-induced
stresses. However, if Microcells™ are installed
on the legs between braces (See Figure 3-6),
insulatio on each of the adjacent braces is required
for best performance. This “brace wrap”
insulation increases system accuracy by further
reducing sun-induced stresses.
INSULATION ORDER AND INSTALLATION
EQUIPMENT
The following are included with the insulation
order (quantities are dependent of the number
of braces):
Brace wrap, 60 in by 85 in (1.5m by 2.2m)
Tie wraps
The following are used for installation:
Flexible tape measure
Heavy-duty knife
INSTALLING BRACE WRAP
1. See Figure 3-17. Using a flexible tape
measure, measure and record the wrap width
required. allowing for a minimum 2 in (51mm)
overlap.
2. See Figures 3-17 ad 3-18. Lay the wrap on a
flat surface. Mark and cut it at the distance
from Step 1.
3. See Figure 3-19. The goal is to cover most
of the brace with wrap. Covering the brace
where it crosses another brace in the middle
is unnecessary. Depanding on the brace lenth,
multiple sections of wrap may be required,
with each section overlapping the one below
it by a minimum of 2 in (51mm). Measure and
record the space available for each section of
wrap. If the space is more than 60 in (1.5m),
skip Step 4 and proceed to Step 5.
Note
If a junction box is mounted within the area to
be covered by wrap, cut the wrap so it does not
cover the junction box.
4. From the top edge, measure and mark the
wrap at the distance from Step 3. Cut the
wrap where marked.
5. Position the wrap, starting at the bottom of the
brace. Wrap it around the brace, overlapping
the ends as shown in Figure 3-17. Fasten the
wrap to the brace with four tie wraps.
6. Repeat Steps 2 through 5 for additional
sections of wrap. Overlap each section of
wrap by a minimum of 2 in (51mm).
Figure 3-17. Wrap on Various Shapes.
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