10.3.4 Flex Probe Wiring
1. Run one data cable for each probe. No splices are
allowed between probe junction box and console.
Multiple flex-probe cables are allowed in one conduit.
Use labels to mark TANK # on each cable at the
console.
2. Leave 16-inches (40.6 cm) in length of extra cable
inside the probe junction box.
3. Install fiber dam and sealing compound in all vapor
seal-off fittings. Installing Adaptor, Float, Weight on
the Probe.
4. Carry the probe to the top of the tank in its rolled-up
state. Do not remove the tie wraps.
5. Carry the floats and remaining installation
components to the top of the tank.
6. Cut only the tie wrap (Labeled #1) that is securing the
tip of the probe to the rest of the coil. This should
provide enough length to install the float and related
hardware (see Section 9.5.2).
7. Assemble the remaining adaptor hardware that the
float will not fit through and slide this adaptor
assembly onto probe. Do not apply thread sealant at
this time.
8. Install the product float on the probe shaft with the
magnet towards the bottom of the probe.
9. Install the weight on the probe shaft with the recess
toward the bottom of the probe.
10. Install the weight-retaining pin through the hole in the
tip of the probe.
10.3.5 Installing the Flex Probe
1. Position the coiled probe over your shoulder so that
the coil is vertical with the float in front of you.
2. While holding the adapter hardware, carefully feed
the weight and floats into the tank opening. Be careful
not to scratch the probe shaft during the installation.
3. Cut the next tie wrap (Labeled #2) and continue
feeding the probe into the tank.
4. While slowly uncoiling probe, continue cutting the tie
wraps in order until the probe is fully installed in the
tank.
5. Hand-tighten the probe head into the still loose
threaded adaptor hardware. Thread sealant is not
required on the nylon probe bushing.
6. Install the rest of the adaptor to the tank using a
minimal amount of thread sealant.
NOTE: Nylon probe bushing is easily cross-threaded.
10.3.6 Finishing the Flex Probe Installation
1. Connect the probe wiring bushing ½-inch NPT to the
junction box using a short length [18 inches (45.7 cm)
max] of flex conduit.
2. Connect the probe to the cable in the junction box and
console (as shown in image from Section 9.4).
3. Verify that the probe is operating correctly at the
console.
4. Waterproof the probe connections at the junction box
with the epoxy seal-pack and close the junction box.
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