TD80™ Level Gauging and Overfill Prevention System Product Manual
Page 30 TD80 Installation/ Rev. 2, August 4, 2015
twisting during installation. Place the anchor cone at the position indicated by the
manufacturing or installation drawings.
c. Ensure that the anchor cone is aligned within 3 degrees of vertical above where
the top fitting is welded.
d. Weld the anchor cone in place.
Step 2: Cut and Install the Dual Rod Probe. See Coaxial probe installation instructions
below.
Note: If the probe is for use in corrosive environments, ensure the Hastelloy® probe,
shorting block, and set screws are used.
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 Dual Rod Probe to Length, See Figure 2-7 & Figure 2-8
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 overall length of the probe. 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 screw retaining the shorting block on the rods of the probe. Do not
completely remove the screw and ensure that the lock washer is in place
between the screw head and the shorting block.
c. Slide the shorting block up the probe until the bottom of the block is at the overall
length of the probe when it is installed.
d. Tighten the screw on the shorting block. Ensure that the rods are not twisted and
then completely tighten the screw.
e. Use a hacksaw to cut off the rods at the bottom of the shorting block. For the
Hastelloy® probe rods, a pipe cutter or die grinder is recommended.
f. Use a flat file to remove any burrs after cutting the rods. The ends should be
smooth and flush with the shorting block.
2. Install the Dual Rod Probe
a. Inspect the probe for any bends or twists. Loosen the shorting block to readjust
the rods, and then retighten once the rods are straight and parallel.
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 2: Cut and Install the Coaxial Probe. See Dual Rod probe installation instructions
above.
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