PAL-AT Installation Manual
60
9 Probes
9.1 UL Requirements
All PermAlert probes are approved for installation in ordinary, or unclassified, locations. All PermAlert
probes, except the PWS water probe, are also approved for installation in hazardous locations (see
figures 3-2 and 3-3) when the sensing string is connected to a Zener Barrier Panel and Zener Barrier
Assembly.
9.2 Probe Integrator Selection
All probe integrators have a red or blue band(s) of shrink tubing on the probe lead cable. A probe integrator
with a red band(s) is used with PHLR, PSTV, PFS and PTHL probe or a normally closed switch. A probe
integrator with a blue band(s) is used with the PWS probe or a normally open switch.
The number of bands on the probe integrator indicates where it can be used in the sensing string. One
band (-S model) indicates the probe integrator must be connected to the system in the first 5,000' [1500
m] of sensing string. Two bands (-L model) indicate the probe integrator must be connected to the sensing
string beyond 5,000' [1500 m] (Contact factory for specific requirements).
9.3 Probe Installation
1. All PAL-AT probes are furnished with a probe integrator and 60' [18 m] of JMP-U jumper cable in a
NEMA 4X [IP66] junction box. The probe integrator allows the attachment of probes to the PAL-AT
monitoring system. The standard 10" x 8" x 4" [250 mm x 200 mm x 100 mm] junction box can house
one integrator. A 12" x 10" x 4" [300 mm x 250 mm x 100 mm] junction box is recommended if 2 probe
integrators are located in one box.
2. The maximum temperature for a probe integrator is 180°F [80°C] in ordinary locations. If a probe
integrator is connected to a ZBA in a hazardous location, the maximum temperature is 140°F
[60°C].
3. The standard polyester probe junction box is rated for 150°F [65°C]. An optional high- temperature
fiberglass box is also available. Make sure the enclosure is appropriate for the ambient temperature.
4. Some probe components (epoxy, shrink tubing, etc.) are resistant to many hydrocarbons and
chemicals. However, the probes should be cleaned promptly after a leak event. If left exposed to
hydrocarbon liquids or chemicals for extended periods, the probes may require replacement.
5. Mount the probe integrator junction box at a location close to the point being monitored. PermAlert
supplies probes with 20' [6 m] of twin lead cable. Uncoil the twin lead cable. Do not splice on
additional wire to lengthen the leads. If the probe integrator is located in a manhole or pit, which
may collect and hold water, mount the junction box as high as possible.
6. Figures 9-1 and 9-2 show the recommended installation procedures. Figures 9-3 thru 9-7 show typical
probe installations. Install the probe and use electrical conduit and/or watertight cord grips, as
necessary, to prevent water entry where the probe twin lead penetrates the monitored area. If the
probe lead length is longer than 5' [1.5 m] and the probe is installed in the first 800' [245 m] of a system,
plastic conduit should be used instead of metal conduit. The cord grip (part # 8057950) with the oval
opening in the bushing is used with the twin lead cable. The cord grip (part # 8057954) with the round
hole is for the jumper cable.
7. Once a probe is installed, the twin lead should be routed to the junction box containing the probe
integrator. Trim the excess length of the probe twin lead before splicing it to the probe
integrator. Splice the leads to the integrator by using the crimp connectors supplied with the probe.
Heat the splice with a heat gun to seal the adhesive-lined shrink tubing on the connector.
8. Use all 60' [18 m] of jumper cable furnished with the probe integrator. If the jumper cable leads are
too long, do not shorten, but loosen the watertight cord grips and coil the excess jumper cable within
the probe junction box. One jumper cable length is shorter than the other is. Connect the shorter end
(10') [2.5 m] to the cable segment closest to the PAL-T panel. The longer end of jumper cable (50')
[15 m] should be routed to the connection point for the continuation of the sensing string.
9. Additional jumper cable may be required to be added to the end of a probe installed beyond 3000' [900
m] on the cable string (see table 9-1).
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