RESETTING THE TRANSMITTER
If you have fuel with a specific gravity different from 0.880 you should change the specific gravity setting of the transmitter.
NOTE: you cannot directly enter the numerical value for fuel specific gravity when resetting the transmitter. The numbers you actually set on the transmitter are the numbers shown in Figure 4 for the Full scale blind setting .
If you need to change the transmitter setting, compare the specific gravity of your fuel with those shown in Figure 4. Choose the specific gravity with a value closest to that of your fuel. Use the Full Scale Blind Setting shown for that value as the new setting of your transmitter.
The transmitter has a display window (Figure 3) and a set of magnetic pushbuttons (Figure 5). Use the magnetic pushbuttons on the transmitter to reset the transmitter.
First use pushbutton M to cause Mode 6 to show in the display window. Then use the other two pushbuttons to set the appropriate number from Figure 4. Press pushbutton M again to save your settings.
The only configuration parameter that you can use to reset fuel specific gravity is Full scale “blind setting” or Mode 6. Do not change any other parameter!
FUEL LEVELS Vs. GALLONS
As already noted the transmitter indicates fuel levels in feet. You may need to know how many gallons of fuel that various levels represent.
Heatec furnishes a computer printout showing the gallons for every inch of distance from the bottom of the tank. However, the pressure transmitter is set up to indicate levels in feet above the point where the transmitter is installed.
The transmitter is installed 1.333 feet (16 inches) above the bottom of the tank. (This distance may vary plus or minus 1/4-inch.) Consequently, the transmitter indicates zero feet when the fuel level is at the same height as the transmitter. So there are approximately 941 gallons of fuel in the tank when the transmitter indicates zero.
|
Figure 6. Fuel Volumes At Various Levels
|
|
Distance above
bottom
(inches)
|
Distance above
bottom
(feet)
|
Gallons
(from
bottom)
|
Transmitter Display
(feet)
|
Gallons
above Transmitter
|
|
420
|
35.0
|
24692
|
33.667
|
23751
|
|
390
|
32.5
|
22928
|
31.167
|
21987
|
|
360
|
30.0
|
21164
|
28.667
|
20223
|
|
330
|
27.5
|
19401
|
26.167
|
18460
|
|
300
|
25.0
|
17639
|
23.667
|
16698
|
|
270
|
22.5
|
15873
|
21.167
|
14932
|
|
240
|
20.0
|
14110
|
18.667
|
13169
|
|
210
|
17.5
|
12346
|
16.167
|
11405
|
|
180
|
15.0
|
10582
|
13.667
|
9641
|
|
150
|
12.5
|
8818
|
11.167
|
7877
|
|
120
|
10.0
|
7055
|
8.667
|
6114
|
|
90
|
7.5
|
5291
|
6.167
|
4350
|
|
60
|
5.0
|
3527
|
3.667
|
2586
|
|
30
|
2.5
|
1764
|
1.167
|
823
|
|
16
|
1.3
|
941
|
0.000
|
0
|
|
0
|
0.0
|
0
|
|
|
|
Note: The volumes shown are for single wall tanks. Volumes are approximately 4% less for tanks with double walls.
|
Figure 6 shows gallons of fuel for distance above the bottom of the tank as well as gallons above the transmitter. This figure is applicable for Heatec fuel tanks with capacities up 25,000 gallons (without heating coils). The information shown in Figure 5 is based on fuel at a temperature of 60 degrees F.