Kistler-Morse KM L-Cell Bolt-On - Manual (Page 65)

Chapter 6. Microcell Installation on Vertical Pipe Legs
6-8
3. Drill and tap the mounting holes with a #29 drill bit and #8-32 tap.
4. Mount the junction box with #8-32 socket head cap screws and flat
washers. Tighten the screws until snug. Replace the junction box
cover and screws if not ready to begin wiring, to ensure no mois-
ture enters the junction box.
Note
The four small holes in the bottom of the junction box are for
wiring the Microcells to the junction box.
1. Remove the junction box cover.
2. See Figure 6-17. Place a plastic washer on a watertight fitting.
Thread the Microcell cable through a cap and watertight fitting.
Leave an adequate length of cable between the Microcell
and fitting to provide a drip loop (see Figure 6-18).
3. Spread a generous bead of sealant around the sides of the water-
tight fitting.
4. In the bottom of the junction box, locate one of the four small holes
closest to the terminal you will use for that Microcell. Screw the
watertight fitting into the hole.
Note
TB3 terminal block has 12 terminals to accommodate up to four
Microcells (A, B, C, and D). Locate the terminal labeled for the
Microcell you are wiring.
5. Estimate the required length of cable to the terminal strip, allowing a
little extra for strain relief. Cut the excess cable.
6. Strip back 3” (76mm) of the cable sheathing to expose the three
wires inside. Strip back
1 /
4
” (6mm) of insulation from the end of each
of the wires.
7. Connect the wires from the Microcell to the selected TB3 terminals:
black wire to B terminal, white wire to W terminal, and red wire to R
terminal. (Fig. 6-18)
Wiring Microcells to Junction Box
Figure 6-17. Inserting Microcell Cable through
Watertight Fitting and Cap
Microcell
Cable
Watertight Fitting
and Cap
Small Hole
12
12
12
12
12
123456
123456
Plastic
Washer
Sealant
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
electronics.