Kistler-Morse KM L-Cell Bolt-On - Manual (Page 67)

Chapter 6. Microcell Installation on Vertical Pipe Legs
6-10
Notes
1. The procedure below assumes the conduit/cable tray has
been installed.
2. Seal all conduit fittings against water entry. Install drain holes
at conduit’s lowest elevation(s) to allow condensation to
drain.
3. Use Belden™ 3-conductor shielded interconnect cable or
equivalent to wire junction boxes together and to the signal
processor. For lengths up to 1,000’ (305m) use 18-gage Belden
8791 cable. For lengths from 1,000’ to 2,000’ (305m to 610m)
use 16-gage Belden 8618 cable.
4. When wiring cable to junction box terminals, strip back 3”
(76mm) of cable sheathing to expose the three conductor
wires and shield wire inside. Strip
1 /
4
” (6mm) of insulation
from the end of each of the conductor wires.
5. All wiring routed between junction boxes and signal
processor must be continuous (no splices).
1. Remove the junction box cover.
• Conduited installation — Install a conduit fitting in the large
hole in the bottom of the junction box.
• Non-conduited installation — See Figure 6-19. Spread a
generous bead of sealant around the sides of the PG13.5 cable
fittings. Install the fittings in the two large holes in the bottom of
the junction box.
2. See Figure 6-20 (conduited installation) or Figure 6-21 (non-
conduited installation). Route the 3-conductor cable through the
fitting into the junction box farthest from the signal processor.
Connect wires from the cable to the TB2 terminal in the junction box:
black wire to B terminal, white wire to W terminal, and red wire to R
terminal. Connect the cable shield wire to the Shield terminal
between TB1 and TB2.
3. Route the cable through conduit/cable tray to the next junction box.
Estimate the required length of cable to the terminal strip, allowing a
little extra for strain relief. Cut the excess cable. Connect wires from
the cable to the TB1 terminal in the junction box: black wire to B
terminal, white wire to W terminal, and red wire to R terminal.
Connect the cable shield wire to the Shield terminal between TB1
and TB2.
Figure 6-19. Inserting Shielded Interconnect
Cable through PG13.5 Fitting and Cap
PG13.5 Fitting
and Cap
Large Hole (typical)
Sealant
Shielded Cable
12
12
12
12
Note: After cable is
connected to terminals,
tighten cap until cable
glands in fitting seal
around cable.
CAUTION
Only use Sikaflex 1A
polyurethane sealant
or Dow Corning RTV
739 or RTV 738.
Other sealants may
contain acetic acid,
which is harmful to
sensors and electron-
ics.