Omega FTB500 - Manual (Page 5)

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2 Operation
2.1 Principle
The Omega FTB500 Series of Low Flowrate Meters has been
developed to meet the need for a low flow measurement device
for use with low to moderate viscosity clean liquids and for gas
measurement applications.
The Omega FTB500 Series of Low Flowrate Meters is a family of
low flow rate measurement devices whose design is based on a
Pelton Wheel-like rotor. The measured fluid is directed
tangentially through a velocity nozzle against the rotor causing it
to spin. The pickup coil senses the spinning motion of the rotor
through the housing and converts it into a pulsing electrical
signal. Summation of the pulsing electrical signal relates directly
to the total flow, while the frequency is related to the flow rate.
2.2 Precautions

Do not drop the meter. Dropping the meter may result in
damage to the meter housing and/or internals.

Do not operate the meter at flowrates greater than the
maximum flowrate marked on the meter. Operating at
flowrates greater than the maximum flowrate may over-
spin the meter. Over-spinning may result in damage to
the meter.
CAUTION : Avoid over-spinning the meter. Over-spinning the meter may
result in damage to the meter internals and lead to meter
failure.