TD80™ Level Gauging and Overfill Prevention System Product Manual
Rev. 2, August 4, 2015/ TD80 Installation Page 31
The probe has been cut to the proper length when it is fully threaded into the top fitting
with a ½” gap between the bottom of the tank and end of the probe at the shorting block,
inside the anchor cone.
Before installing the probe, ensure that the top of the probe is protected from dirt, oil and
physical damage by the orange plastic cap it is shipped with. This cap must remain in
place until the transmitter is mounted.
1. Cut the Coaxial Probe to Length, See Figure 2-10 & Figure 2-11
a. The probe is shipped longer than required to fit all installations. It is cut to length
once the height of the tank is known. Measure the height from the bottom of the
tank, inside the anchor cone to the top edge of the 1” NPT top fitting. Add 1 ½” to
this height. This is the length of the probe to the top of the shorting block.
Temporarily remove the protective orange cap. Transfer this measurement to the
probe, starting at the very top of the probe. Replace the cap before proceeding.
b. Loosen the set screw retaining the shorting block on the center rod of the probe.
c. Slide the shorting block off the end of the probe. The shorting block is press-fit
into the coaxial tube. Clamping the end of the shorting block in a vise and then
twisting while pulling the probe can make this easier to accomplish.
d. Cut the tube at the marked length using a tube cutter. This ensures a clean and
even cut around the end of the tube.
e. Use a half round file to clean some of the burring left behind inside the cut end of
the tube. The shorting block must still press-fit with some resistance when
reinstalled.
f. Reinstall the shorting block on the center rod and tap into place on the end of the
tube. The shorting block must butt up evenly with the end of the tube.
g. Tighten the set screw on the shorting block and inspect the center rod for
bending or bowing. Loosen the set screw and adjust the shorting block position
until the center rod is evenly spaced along the length of the tube. Retighten the
set screw.
h. Use a hacksaw to cut off the center rod at the bottom of the shorting block.
i. Use a flat file to remove any burrs after cutting the rod. The end should be
smooth and flush with the shorting block.
2. Install the Coaxial Probe
a. Inspect the probe for any bending of the center rod. Loosen the shorting block to
readjust the rod, and then retighten once the rod is straight.
b. Inspect the threads on the probe and top fitting for damage or debris. Do not
install the probe with damaged threads.
c. Apply Teflon tape or anti-seize compound to the 1” NPT threads that mate with
the top fitting.
d. Carefully insert the probe through the top fitting, resting the shorting block inside
the anchor cone.
e. Hand tighten the probe into the top fitting, then finish tightening with a 1 ¾”
wrench.
f. Ensure that the probe is not bent or twisted after installation.
g. Ensure that there is approximately a ½” gap between the shorting block and the
bottom of the tank.
Step 3: Component Mounting
1. Mount the Transmitter
a. Ensure that the protective orange cap remains on the probe if the transmitter will
be mounted at a later time.
b. Carefully remove the protective cap from the probe. Ensure that the threads are
not damaged. Inspect the transmitter and probe for dirt, oil, moisture or debris.
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