4.5
Flex Probe Installation
Proper operation of the SiteSentinel® iSite™ system using the flex
probe depends on the correct sizing of the probe. If the probe is too
long, it will touch the bottom of the tank and bow, causing either
inaccurate or loss of readings. If it is too short, product measurement
range will be compromised.
Each Flex Probe is custom made to fit a particular tank. They are not
returnable if an error is made in determining the correct length.
4.5.1 Probe Length Determination
1. The flex probe mounts to the tank with a ¾-inch NPT male
thread. Obtain the proper fittings to adapt the tank opening
to a ¾-inch NPT female thread. Do not use the tank’s vent
opening to install the flex probe.
2. Temporarily install this hardware in the tank opening.
3. Using a plumb bob or measuring tape measure the distance
(in inches) from the top of the ¾-inch NPT flange to the
bottom of the tank. Save this measurement, which will be
Total Height (TH).
4. Flex probes are ordered by overall length (OAL). Overall
length is the distance from the top of the ¾-inch (19.1 mm)
NPT wiring bushing to the tip of the probe. OAL (inches) =
1.5 + (TH x .993)
•
If cable runs to 750 feet (229 m) use Belden #88761
•
If cable runs to 1,000 feet (305 m) use Belden #8760,
#88760 or #8761
Some electrical codes require intrinsically safe wiring to have a blue
jacket.
4.5.2 Installation Preparations
5. Measure the product level in the tank. Keep tank out of
service to prevent product level from changing.
6. Make note of the probe information found on the probe
serial number tag.
7. Locate standard plumbing fittings that will adapt your tank
opening to the ¾-inch NPT required for the probe.
8. Mount all of the pieces of this adaptor that floats will fit
through to the tank opening using a minimal amount of
thread sealant. Wipe any excess sealant from the inside of
the fittings to prevent any from getting on the probe shaft
during installation.
4.5.3 Installation Procedure
9. Run one data cable for each probe. No splices are allowed
between probe junction box and console. Multiple TLM flex-
probe cables are allowed in one conduit. Use masking tape
or labels to mark TANK # on each cable at the console.
10. Leave 16-inches (40.6 cm) in length of cable inside the
probe junction box for connection.
11. Install fiber dam and sealing compound in all TLM vapor
seal-off fittings.
Figure 4-4 Probe Installation
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