8.2 Probe-Cable Seal-Offs
Seal-off the probe cables before they enter the I.S. barrier! This
prevents explosive vapors from entering the I.S. barrier.
1. 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.
2. 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.
3. The cable is then routed—via rigid steel conduit—out of the
box and directly to the I.S. barrier.
4. Label each cable and wire.
CAUTION: Only OPW probe cables and sensor wiring can share the
conduit to the I.S. barriers.
CAUTION: 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.
CAUTION: The console must have a dedicated power circuit, and
must be on the phase as all other OPW equipment.
Figure 8-2 Probe-Cable Seal-Offs
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