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Carrick Patterson
I installed a Flo-Scan and regretted it because of all the extra plumbing.
Plus it turns out you basically need to know your fuel flow, then set the
Flo-Scan to match that. Well, if you ALREADY know your fuel flow, why bother
with the meter?
REPLY
The process you refer to is called calibration. It is essential for all
accurate instrumentation.
I got involved in some basic fuel flow gage design while building production
test equipment for Ford Aerospace.
Liquid flow can be measured in several ways but physical factors in the
installation will affect the rate of flow.
Mechanical impellers have small variations that require fine tuning in the
final assembly.
To accurately measure fuel consumption in diesel engines not only do you need to
measure inflow but also outflow.
If the outflow sensor is even slightly faster than the inflow sensor you end up
with an accumulated error that grows in direct proportion to how much excess
fuel is used to cool the injectors and is returned to the tank.
Fluids which can be measured by ultrasonic means instead of an impeller suffer
from similar effects.
However this is the only practical way to measure fluid flow on a moving vessel
Level measurements of tank depth can never be precise enough for accuracy
better than about five percent unless you are talking about very tall and narrow
tanks.
cheers
Arild
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