10
Probe-Cable Seal-Offs
Seal-off probe cables before they enter the VSmart Module! This
prevents explosive vapors from entering the module. Remove enough
of the jacket to allow approximately 3 inches (7.6 cm) of wire leads to
extend past each seal-off.
DO NOT nick the wire insulation.
Probe or sensor wires using prepared Belden or Alpha cable go
through NPT bushings into a weatherproof junction box. Bushings
must be used in all junction boxes. The cable is then routed—via rigid
steel conduit—out of the box and directly to the VSmart Module. Label
each cable and wire. See Figure 10-1.
Only OPW probe cables and sensor wiring can share the conduit to the
VSmart Modules. Improper cables, wiring, or conduit allow electronic
noise to interfere with probe/sensor measurements. This may cause
measurement readings at the console resembling hardware failure. The
warranty is voided if improper cables, wiring and/or conduit are installed.
The ground wire must be properly installed for the operation of the noise-
filtering circuitry. Do not rely on the conduit for the operation of the
ground. The console must have a dedicated power circuit.
Figure 10-1 Probe-Cable Seal-Offs
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