Floscan TwinScan Tachometer - Manual (Page 4)

5/20/1999 1000-206-00
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
The number of bars visible in the display indicates how far the engines are out of synch. Referring to the gas engine settings in the
chart below, the display shows one vertical line if the engines are within 200 rpm (coarse) or 100 rpm (fine); it will only indicate
“IN SYNCH” if the engines are within 100 and 50 for the coarse and fine resolution respectively.
Number of bars displayed Coarse (gas) Fine (gas) Coarse (diesel) Fine (diesel)
≡ ≡
100 50 50 20
| 200 100 100 50
| | 300 250 200 150
| | | 400 400 300 300
| | | | over 400 Over 400 over 300 over 300
Table 1 Synch resolution
4. Nautical Miles per Gallon/Liters per Nautical Mile
The TwinScan
tachometer displays nautical miles per gallon or liters per nautical mile (depending on the internal configuration of the
instrument) when it is used in conjunction with the TwinScan GPH and a device that outputs a NMEA 0183 data stream (GPS, Loran
C, etc.).
During normal vessel operation, adjusting engine RPM to your maximum MPG (L/NM) reading maximizes your fuel mileage. When
switching fro
the synch mode to MPG (L/NM), you will notice the display temporarily indicate MPG—“
n
n PG ” or m
L/NM—“ LP n
n” before it starts reading efficiency. The speed and flow data are smoothed for about 30 seconds, so wait for 30-60
seconds after making a throttle or trim change for the MPG/LPM reading to respond. Vessel trim, load, adjustment of trim tabs, water
currents and weather conditions also affect your fuel consumption. For similar operating conditions, dramatic changes in MPG
(L/NM) readings indicate possible mechanical malfunction, propeller damage or excessive bottom fouling and should be investigated.
Your current MPG (L/NM) reading on the TwinScan Tachometer instrument and GALLONS (LITERS) reading on the TwinScan
GPH (LPH) instrument allow you to quickly and easily estimate your current maximum cruising radius. For safety, allow a margin of
error when calculating your next fuel stop.
5. Illumination
TwinScan instruments use a dual method of illumination to create a high contrast display making it easy to read at night without
affecting your night vision. The pointers are individually lighted so all the port pointers light when the port key switch is energized
and all the starboard pointers light when the starboard key switch is energized. “Light piping” directs the light from an incandescent
lamp across the dial face instead of bouncing it off the dial face and into your eyes.
6. Caring for your instrument
The front lens of your TwinScan instrument is made of hardened Lexan and is resistant to mild abrasion. Use mild soap and water to
clean. Never wipe with a dry cloth. This can scratch the lens and builds up static electricity attracting dust and dirt. Avoid solvents
such as acetone, benzene, and lacquer thinner as they attack the surface of the lens. Most window and kitchen cleaners contain at
least one of these solvents plus mild abrasives and should be avoided. Applying automobile or furniture wax covers minor scratches
on the lens and helps prevent further scratching.