TD80™ Level Gauging and Overfill Prevention System Product Manual
Page 22 TD80 Installation/ Rev. 2, August 4, 2015
1. Offset Calibration Using a Loaded and Metered Volume
a. Ensure the tank is level in all directions.
b. Fill the tank approximately 1/2 to 2/3 full. Determine the volume with a flow meter.
c. Turn the gauge power off.
d. Press and hold either the Up or Down button while turning on gauge power.
e. Continue to hold the button down until “CAL” is displayed and then release it.
f. After the normal display start-up sequence, “CAL” will be displayed flashing for
several seconds and then the current volume measured by the TD80. This should be
close to the actual volume.
g. Use the Up and/or Down buttons to adjust the displayed volume to the actual
amount. Then release the buttons.
h. Turn the gauge power off.
i. Turn the gauge power on, without holding any buttons.
j. Verify that the display matches the actual volume.
k. Offset calibration is now complete. This procedure should be done seasonally to
maintain the TD80 rated accuracy.
2. Offset Calibration Using an Unloaded and Metered Volume
See Figure 2-1 sample depth chart for the following calibration step examples.
a. Ensure the tank is level in all directions at the unloading site.
b. Note the TD80 reported volume. This must be less than the Spill alarm level.
i. For example, the TD80 reported volume is 198.9 bbl
c. Unload at a metered site. Note the metered volume when the tank is completely
empty.
i. For example, the site metered volume is 195.4 bbl
d. Refer to the manufacturer’s depth chart for the following step.
i. Determine the distance between the TD80 reported volume and the metered
amount. For example:
1. The TD80 volume is 198.9 bbl at a depth of 70.75”
2. The site metered unloaded volume is 195.4 bbl
3. The depth chart shows 195.4 bbl at a depth of 69.00”
4. 70.75” - 69.00” = 1.75”
5. The difference is 1.75” down in depth
ii. Note this difference as an increasing or decreasing number of inches and
fractional part of an inch to adjust the TD80 reported volume.
e. At the next site, load the tank to approximately 3/4 full. Note the TD80 reported
volume.
i. For example, 168.1 bbl is loaded for the calibration as shown on the Finch
Display.
f. Refer to the manufacturer’s depth chart. Determine the depth at the currently loaded
volume reported by the TD80.
i. According to the sample depth chart, 168.1 bbl is at a depth of 59”
g. Add or subtract the distance calculated at step 4 to increase or decrease to the
actual volume. Note the actual volume from the depth chart.
i. For example, 59” – 1.75” = 57.25”
ii. Actual volume is 162.5 bbl at a depth of 57.25”
iii. 162.5 bbl will be the newly calibrated volume
h. The TD80 can now be calibrated to a metered volume.
i. Turn the gauge power off.
j. Press and hold either the Up or Down button while turning on gauge power.
k. Continue to hold the button down until “CAL” is displayed and then release it.
l. After the normal display start-up sequence, “CAL” will be displayed flashing for
several seconds and then the current volume measured by the TD80.
i. The TD80 reports the loaded volume as 168.1 bbl
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