Doc. No.: M1500, Rev. 6
Page 23 of 127
• 67733 Gross Point Road 900 Santa Fe Dr.
To prevent explosive vapors from entering the I.S. barrier, seal-off the
probe cables before they enter the I.S. barrier.
1. Remove enough of the jacket to allow approximately 7.6 cm (3 inches) 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.
The console must have a dedicated power circuit, and must be on the same phase as
all other OPW equipment.
Only OPW probe cables and sensor wiring can share the conduit to the I.S. barriers.
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.
Figure 6-1 Probe Cable Seal-Offs
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