Floscan 9000-20B-1 GPS Interface System - Manual (Page 20)

7/9/2003 7000-040-00B
Example 1: Twin engine vessel with two dedicated fuel tanks, (For single engine vessel with single tank, see Example 2).
After steaming and returning to refuel. The Port tank took 91.6 gallons, and the Starboard tank took
93.2 gallons. Total fuel consumption is 184.8 gallons, and the totalizer reading is 181.1 gallons.
1 0
F
E
D
C
B
A
9
6
7
8
5
4
3
2
0%
1%
2%
3%
4%
5%
-1%
-2%
-3%
-4%
-5%
-6%
-7%
-8%
-9%
-10%
Upper BLACK switch
• Using the formula, calculate the percentage difference between the totalizer reading and actual fuel
consumption.
Difference in Gallons
x 100
Totalizer Reading
• Find the difference between the totalizer and fuel pump readings:
(184.8 gallon fuel pump reading) - (181.1 gallon totalizer reading) = 3.7 gallon difference between readings.
• Determine percentage difference between readings:
FloScan Instrument Company, Inc. Tel: (206) 524-6625 Fax: (206) 523-4961
3016 NE Blakeley Street, Seattle, WA 98105 Email: [email protected] Http://www.floscan.com
(3.7 gallon difference) ÷ (181.1 gallon totalizer reading) = .020 x 100 = 2% Lower difference, (Totalizer reads low).
• To calibrate, rotate the MFI’s Black Switch Clockwise to position # 2, increasing totalizer reading by 2%.
Example 2: Single engine vessel with single fuel tank.
After steaming and returning to refuel the fuel tank took 91.5 gallons. The totalizer reads 94.4 gallons.
• Using the formula, calculate the percentage difference between the Totalizer reading and actual fuel consumption.
Difference in Gallons
x 100
Totalizer Reading
• Find the difference between the totalizer and fuel pump readings:
(94.4 gallon totalizer reading) – (91.5 gallon fuel pump reading) = 2.9 gallon difference between readings.
• Determine percentage difference between readings:
(2.9 gallon difference) ÷ (94.4 gallon totalizer reading) = .030 x 100 = 3% Higher difference, (Totalizer reads high).
• To calibrate, rotate the MFI’s Black Switch Counter-Clockwise to position D, reducing its’ totalizer reading by 3%.
This completes system calibration. The Instrument should be within 3-5% of actual consumption. Calibrating a second time should
bring it to within 1-3% especially on twin engine vessels. Larger fuel burns increase calibration accuracy.
Drastically changing operating habits, (Changing from mostly cruising to mostly trolling) may affect totalizer accuracy. If this occurs,
re-calibration may be necessary.
NOTE: Instrument calibration affects both the totalizer, (GALLONS) and GPH readings.