Fill-Rite TM Series Precision Meter - Manual (Page 3)

About FPP Meters
We thank you for purchasing an FPP METERS
product for
liquid measurement service. FPP METERS , formerly Fluid
Power Products, is now a trade name of Tuthill Transfer
Systems. FPP was established in 1980. Since its inception,
the company has been dedicated to manufacturing cost-
effective, high performance flow metering devices for petro-
leum, industrial, commercial and municipal service.
Our facilities include computerized order entry and inventory
control, so that you are assured of accurate and prompt de-
liveries. Furthermore, our production personnel ensure that
each order, regardless of size, receives individual attention.
Constant attention to new product development and produc-
tion design, our high standards of manufacture and final
testing are the reasons why
FPP METERS
meet your most
demanding requirements. With the ‘Waveform’ oval gear
(2003 patent) meter accuracy is better than ever before.
Our meters are used in batching, blending, process control
and to dispense fluids in liquid handling facilities throughout
the World. Service includes gasohol blends, bio-diesel and
special formulation racing fuels.
Principle of Operation
Positive Displacement meters have a measuring chamber,
where inlet & outlet are separated by rotors, a rotating ele-
ment or sliding vanes. As the liquid passes through the flow
meter, it causes the rotors/element/vanes to turn, which
forms the basis for volumetric measurement.
The Oval Gear metering principle is based on two elliptical
(oval) gears, which turn on center on two horizontal shafts
inside a measuring chamber formed by two overlapping cyl-
inders. The oval gears have meshing teeth along their en-
tire circumference, ensuring that the gears will maintain cor-
rect position in relation to each other at all times, without the
use of timing gears.
The volume being transferred from the inlet to the outlet side
(= volume measured), forms between the oval gear and the
side of the measuring chamber, alternately in the upper and
the lower half of the measuring chamber. In a full 360° rota-
tion of the gears, four such known volumes are released to
the downstream side of the flow meter.
The flow meter is 100% gland-less with static O-ring seals
only. Internal magnets are detected by a sensor (pulser)
mounted in flow meter case. The pulser generates an elec-
trical on/off signal, which can be used to drive a signal con-
ditioner or an electronic register.
With precision machining and close internal tolerances, the
slippage is minimal for superior linearity (accuracy) over a
broad turn-down ratio. Oval gear meters are largely unaf-
fected by changes in liquid viscosity. In TM Series meters
we expect a shift of no more than 2-4% due to variations in
liquid viscosity between 1 and 100 cSt. As the viscosity
increases further, there is no noticeable change.
To ensure optimum linearity (accuracy), TM Series meters
should be field calibrated correct for individual meter varia-
tions, liquid viscosity and local system/operational factors.
Fluid Compatibility
FPP Meter flow meters are available in anodized aluminum
and stainless steel, with a variety of rotor types and seals, to
ensure compatibility with a broad range of liquids. If in doubt
about compatibility with a a specific fluid, please refer to
FPP Technical Manual
. If that publication does not provide
a clear answer, please consult with your authorized FPP
Meter distributor, or Customer Care at the factory.
While most refined petroleum products can be handled with
the same flow meter, some require different rotors and/or
seals. Do not change service liquid, without consulting with
your authorized FPP Meter distributor.
1 . 3
TM Series, Principle of Operation
 Only 2 moving parts.
 Patented ‘Waveform’ oval gears = sustained accuracy with a minimum of maintenance.
 No metal-to-metal contact in measuring chamber or in bearings.
 The lowest differential pressure values amongst rotary PD meters.
=> Lower Cost of Ownership!
TM04A
with RS pulser
= 1 magnet in 1 gear
TM04A
with HE pulser
= 4 magnets in gears
TM02D
with HE pulser
= 2 magnets in 1 gear