Rack Control Module
TM
Product Manual
Rev. 1.2, May 9, 2014 Page 28
Sample Depth Chart,
206bbl trailer, 81” depth
in bbl
1 0.05
2 0.1
..
55 155
56 158.4
56.25 159.22
56.5 160.05
56.75 160.87
57 161.7
57.25 162.5
57.5 163.3
57.75 164.1
58 164.9
59 168.1
60 171.3
61 174.3
62 177.3
63 180.2
64 183
65 185.7
66 188.3
67 190.8
68 193.1
69 195.4
70 197.5
70.25 197.97
70.5 198.45
70.75 198.92
71 199.4 HH alarm level
72 201.2
73 202.8
73.5 203.45 Spill alarm level
74 204.1
75 205.2
76 205.7
77 205.9
78 206.1
79 206.3
80 206.5
81 206.7
Step 17: Offset Calibration Description
Offset calibration of the TD80 transmitter is required
after installation, programming or replacement of the
TD80 transmitter. The calibration compensates for
variations from the calibration chart provided by the
tank manufacturer and probe mounting height above
the tank top. It is recommended to recalibrate
seasonally to maintain the rated accuracy.
Small differences in tank height, probe position on
the tank and variation from the calibration chart are
compensated by adjusting the displayed volume to a
known amount. Large changes to the offset
calibration indicate an error in programming. Review
the calibration chart and mounting details, confirm
that the TD80 transmitter is programmed for the
compartment it is installed on and reprogram if
necessary.
Offset calibration will halt if the adjusted level causes
the High-High alarm setting to exceed the Spill alarm
level. The High-High alarm is programmed to be no
closer than ½” below the Spill alarm. This is also an
indication of incorrect programming to be resolved.
The adjusted level may only be lowered by the
distance between the High-High and Spill alarm
levels.
Methods
Methods 1 and 2 are preferred, while method 3 is
acceptable as better than no calibration. The first two
methods calibrate to a metered load under normal
conditions. This is the most accurate compensation
for mounting location and calibration chart
differences. The third method compensates for
mounting height only and does not have any effect
on variations from the calibration chart supplied by
the tank manufacturer.
1. Offset Calibration Using a Loaded and
Metered Volume
a. Ensure the tank is level in all directions.
b. Fill the tank approximately 3/4 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
Figure 3-11: Sample Depth Chart
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