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FTB3000 Series
Positive Displacement Meters
Contents
Introduction...................................................................................3
1.
2. Specifications................................................................................5
3. Operation...................................................................................... 7
3.1 Principle...............................................................................7
3.2 Precautions...........................................................................7
4. Installation .................................................................................... 9
5. Maintenance................................................................................11
5.1 General...............................................................................11
5.2 Trouble Shooting ...............................................................11
5.3 Spare Parts.........................................................................12
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1. Introduction
The FTB3000 Series of positive displacement meters incorporates
smooth oval rotors in their design. The oval rotor principle has proven
to be a reliable and highly accurate method of measuring flow. Along
with the smooth oval rotors, exceptional repeatability and high
accuracy over a wide range of viscosities and flow rates are features of
the FTB3000 Series flow meter design.
The low pressure drop and high pressure rating means the Omega
FTB3000 Series flow meter is suitable for both gravity and pump (in
line) applications.
Please take a few minutes to read through this manual before installing
and operating your meter. If you have any problems with the meter,
refer to the maintenance and troubleshooting sections of this manual.
If you need further assistance, contact Omega’s customer service
department by telephone or fax for advice.
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2. Specifications
Service Fluids:
Accuracy:
Repeatability:
Flow Range:
w/ Mag Coil Pickup
w/ Hall Effect Pickup
K-factor: 460 pulses per gallon (approximate)
Operating Temperature:
w/ Mag Coil Pickup:
w/ Hall Effect Pickup: -40°C to +150°C (-40°F to +302°F)
Operating Pressure: 3000 PSIG standard
Minimum Fluid Viscosity: 100 cstk
Wetted Parts: 316 SS body and gears with peek gear seats
Bearings: Shielded, self lubricating 440 SS ball bearings
Connections:
Flange Option:
Pickup Coil: Magnetic Type or Hall Effect (6 to 24 vdc power)
Calibration: 10-point calibration traceable to NIST @ 100 cstks
Clean liquids, max particle size .125"
0.25% of reading or better above 100 cstk
0.05%
2 to 20 GPM
0.02 to 20 GPM
-268°C to +232°C (-450°F to +450°F)
1" MNPT STD
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3. Operation
3.1 Principle
The FTB3000 Series of positive displacement meters use a pair of
smooth oval rotors to provide a reliable and highly accurate
measurement of flow. The smooth oval rotors displace a precise
volume of fluid which is passed through the measurement chamber
during each revolution. The smooth oval rotor design along with the
viscosity of the fluid provides a complete viscous seal within the
measurement chamber.
The unique patented design of
Omega’s Oval Gear meter
incorporates two smooth oval
rotors 90 degrees out of phase.
The phase relationship of the
rotors is maintained by two
oval timing gears which are
out of the flow path. The oval
timing gears have a pitch
diameter equal to the outside
diameter of the smooth oval rotors.
The flow through the meter measurement chamber follows the path of
least resistance. Therefore no liquid passes through the center cavity
between the rotors. The fluid is displaced from the inlet to the outlet
via the area between the smooth oval rotors and the inner diameter of
the meter housing.
3.2 Precautions
Before use, confirm the fluid to be used is compatible with the
meter and make certain that the operating conditions conform to
the meter specifications.
To prevent damage to the meter slowly fill the system with fluid
(this will prevent damage that may be caused by air purge).
Keep the flowrate within the meter ratings.
Remove meter from the piping, replacing with a short pipe, when
cleaning the piping system by flushing. Costly damage to the
meter may result if the assembly is cleaned by flushing with the
meter installed.
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4. Installation
Use thread sealant on all pipe threads.
Install the meter carefully to avoid pipe strains.
The meter must be installed on the discharge side of the pump.
In tank-head operation, the head of the fluid must be higher than
the pressure loss of the meter.
The flow direction must conform to the arrow mark on the meter
body.
The meter must be installed in the correct orientation (see figure
below).
FLOW
Pickup
FLOW
Connect appropriate connector from pick-up from DCS or
electronics.
Pickup Connection s
A B
Standard
MAG
A - Signal (+)
B - Common (-)
AC
B
Redi-Pulse
(Open Collector)
A - 8 - 30 Vdc (+)
B - Common (-)
C - Pulse Output
A - 3.5 - 24 Vdc (+ )
B - Com mon (-)
C - Pulse Output
AC
B
Hall Ef fect
(Open Collector)
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5. Maintenance
5.1 General
The Omega FTB3000 Series flowmeters do not require routine
maintenance and do not contain any field serviceable or replaceable
parts.
5.2 Trouble Shooting
Refer to the following troubleshooting guide for assistance with
possible meter malfunctions:
TROUBLE CAUSE REMEDY
Fluid will not flow
through the meter
Line to meter
Insufficient
Reduced flow through
the meter
Insufficient
Meter readings
inaccurate
Fluid viscosity too
Air in fluid. Bleed air from system.
Meter drag due to
Meter not giving pulse
signal
Meter instal led
with incorrect
orientation.
blocked.
differential
pressure.
Line to meter
partially blocked.
differential
pressure.
Fluid flowrate is
too low.
low.
incorrect
installation.
Faulty pickup
sensor.
Re-orientate the meter.
Clear line to meter.
Increase upstream
pressure.
Clear line to meter.
Increase upstream
pressure.
See “Specifications” for
min and max flowrates.
Check fluid
specifications.
Re-adjust meter
installation.
Replace pickup sensor.
Due to the precision alignment of the Omega FTB3000 Series
flowmeter internals, field repairs are not recommended. Should the
meter require internal repairs, return the meter to the factory.
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5.3 Spare Parts
The following table contains the recommended spare parts for the
Omega FTB3000 Series flowmeters:
Item No. Qty Part No. Part Description
1 1 300-6005 MAG Coil Pickup; PC24-45G
1 1 300-6026 Intrinsically Safe MAG
Pickup; ISM-001
1 1 300-6041 MAG Redi-Pulse Pickup;
RPM01S
1 1 300-6052 Hall Effect Pickup; HE01S
NOTE: The meter pickup must be replaced with a pickup of the same
type. Refer to the meter model number for the type of pickup
being used.
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M3585/0411
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