Omega FTB500 Series User manual

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.21
.20
SECTION 8 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . , . . . . . . . . . . . . . .
.20
SECTION 7 ACCESSORIES
. . . . . . . . . .
.I8
SECTION 6 RECOMMENDED SPARE PARTS LIST
. . . . . a
.
15
I5
SECTION 5 TROUBLESHOOTING AND MAINTENANCE
. . . . . . . . . . .
FTBSOO
Flowmeter (Ball Bearing Design)
.
Servicing and Preventative Maintenance of the
. . . . . , . . . . . . . . . . . . . . . .
.I5
4.1
4.2
Introduction
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.
I2
12
I3
I3
13
I3
SECTION 4 MAINTENANCE
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..
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.........................
......
3.4.1 Setup ........................... .
3.4.2 Equations
FTBSOO Signal Conditioner Offset
3.4
Calibration of FTB500 Analog Output
.................
3.3 To Confirm
.......................
3.2
Calibration Procedure
.I2
3.1
Introduction
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.9
SECTION 3 CALIBRATION
. 8
.
7
. 6
7
...
.........
Installation of the FTB500 Mini Flow Signal Conditioner
..................................
General
.................................. .
Installation Wiring Layout for Interconnections
.................................
Operation
.6
2.1
2.2
2.3
2.4
2.5
Unpacking
................. ,
........
.
SECTION 2 INSTALLATION
. . ...
.
1.3.3 Viscosity Calibration and UVC Curves
. . .
.................
.
1.3.2 Viscosity Effects
. .
.........
.
1.3.1
Performance Characteristics
.
...............
.
I.3
Theory of Operation
.
.................
.
I.2
Available Models
.
.....................
.I
1.1 Description
TABLE OF CONTENTS
FTB500 SERIES FLOWMETERS
SECTION
PAGE
SECTION 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . .

503,4 for 504, or 5 for 505.
1
X 1 for 501, 2 for 502, 3 for
tistokesl of your liquid. The maximum is 25CK.
cen- (“CK) in part number with the viscosity (in * Replace
NOTE
FTB50_X-t*CK)-5KP
PSIG
FTB5O_X-(*CK)-115VAC
5000
115VAC signal conditioner power supply
FTB50_X-t”CKb5VDC
FTB50_X-(*CK)-P
0-5VDC
output
TTL Pulse output
FTB505-(“CK)
‘CK)FTB504-(
“CK) FTB503-(
“CK) FTB502-(
“CK) FTB501-(
(Adalet XJS DO) rated for class I, groups C and D, and class
II, groups E, F and G.
Features of the FTB500 include:
1. Integral signal conditioner which provides K-factor offset correction for
the mini-flowmeters.
2. Versatile AC and DC power versions are available.
3. Configurable pulse voltage or analog output options.
1.2
AVAILABLE MODELS
DESCRIPTION
(LINEAR FLOW RANGE)
STANDARD PART NUMBERS
0.02
to 0.15 GPM
0.025 to 0.25 GPM
0.05 to 0.5 GPM
0.1 to 1.0 GPM
0.2 to 2.0 GPM
OPTIONAL PART NUMBERS
PART NUMBER*
pelton wheel-like
rotor whose motion is converted into a pulse output proportional to flow
by a pickup coil. They come with an integral signal conditioner, powered
by either 15-35 VDC or 115 VAC (optional) to provide amplified frequency
and analog output. The signal conditioner corrects for the inherent zero off-
set of the flowmeter pulse output. It is mounted in a NEMA 4X, explosion
proof enclosure
OMEGA@ FTB500 Series Low Flowmeters offer extremely accurate
low flow measurement of liquids and gases. They utilize a
SECTION 1 INTRODUCTION
1.1
DESCRIPTION
The

AMP.
Figure l-l.
Block Diagram
The basic operation of the system is as follows:
The frequency signal from the flowmeter is connected to the FTB500 with
a twisted pair shielded cable. The signal enters through the SENSITIVITY
control which is used to reject unwanted noise by raising the trigger
threshold above the background noise present.
The low level flowmeter signal is then passed through a special condition-
ing chain where it is filtered, amplified, and shaped into a train of digital
pulses whose frequency is non-linearly related to the volume flow rate.
The digital pulse train is then passed through the linearizer where the off-
set frequency signal is injected into it. For flow rates within the range of the
meter, the linearizer output will be linearly related to the volumetric flow rate
In addition, this circuitry drives the ‘low flow ’out of range indicator.
2
pcA_,,B
CONDITIONER
TURBINE FLOWMETER=
MAIN CHASSIS
FREQ. TO
CONVERTER
- -
CAPACITOR COUPLED
ANALOG
OUTPUT
OUTPUT
FTBBOO SIGNAL
1.3
THEORY OF OPERATION
A simplified block diagram of the FTB500 Mini Flow Signal Conditioner is
shown in Figure 1-I.
SENSITIVITY
+v

FTB500 Series of meters establish a linear
response after an initial offset correction when operating at a constant
viscosity.
3
FTBSOO flowmeter are shown
in Figures l-2 and 1-3. The
pelton rotor causing it to
rotate The motion of the rotor is sensed by the pickup coil and converted
to a pulsing output signal where the frequency is related to the flowrate, and
the accumulated pulses are related to the total volume passing through the
flowmeter.
1.3.1
Performance Characteristics
The basic performance characteristics of the
pelton wheel-like rotor. The measured fluid is directed
tangentially through a velocity nozzle against the
FTBSOO integral signal conditioner will compensate for the frequen-
cy offset characteristics of the flowmeter, by using the method of offset
frequency injection. Offset frequency injection is implemented electronically
by adding a signal equal to the offset frequency required to linearize the out-
put of the flowmeter. This effectively shifts the output characteristic to that
of the desired ideal. A low-flow cutout feature is provided where the off-
set signal is inhibited during no flow to prevent false outputs from being
generated.
The FTB500 Series Turbine Meter is a family of low flow rate measurement
devices based on a
flowrate which
does not pass through zero. left uncorrected, this will result in a K-factor
which varies with flow rate.
The
CMOS/lTL
compatible output. The attenuator produces a capacitor coupled AC out-
put which is suitable for driving other signal conditioners, indicators, or con-
trollers which require an AC signal input.
The output frequency from the FTB500 Series Turbine Meter versus flow
is essentially a straight line of frequency as a function of
The signal entering the frequency to analog converter is passed through a
combination of divide by N and DIP switch matrix. The output is chosen
whose pulse rate is between 75 and 150 Hz at the maximum flow rate to
be measured. This scaled pulse rate is fed into a precision monostable cir-
cuit. The output of the monostable is then filtered into an analog voltage
that is proportional to flow.
The output amplifier will take this voltage and perform either a voltage to
voltage amplifier or voltage to current amplifier.
Finally, the output is divided by 8 to reduce irregular pulse spacing. Then,
the pulse train enters a buffer and an attenuator simultaneously. The buf-
fer output produces a square wave pulse which can be used as a

FTBIOO Calibration Curve
4
FLOWRATE
Figure 1-3.
Normalized
% OF MAX IMUM
.80
10 50 100
I_7
f
1.00
7
!
UNLINEARIZED 5 90
8
u
FTBSOO Output Characterlstlcs Diagram
LINEARIZED
(GPM)
Figure 1-2.
/
UN LINEARIZED OUTPUT
FLOW RATE
lL

H,O is the pressure drop from Figure l-4
Figure 14.
Gross Pressure Drop Characteristic Curve on Water
5
PSID
SpGr is the specific gravity
H,O
where:
Cpse is viscosity in centipoise
PSID
(SpGr)” x (Cpsel” x PSID =
flowrate
and the fluids viscosity and density.
FTB500 Series
Turbine Meter given the pressure drop on water at the maximum
FTB500 Series Turbine Meter.
The K-Factor is the number of pulses per unit volume produced by the
flowmeter under a given set of conditions. Repeatability is a measure of the
stability of the output under a given set of flowing conditions. The
repeatability is defined as the allowable percentage deviation from the
stated K-Factor.
The pressure drop characteristics are given based on water at a viscosity
of 1 Cpse and a specific gravity of 1.00. For other fluid ’s, the following equa-
tion may be used to estimate the pressure drop across the
*2% are possible using smart transmitters which can store the
entire characteristics of the
*l% of
reading are typical after initial correction for offset. Better accuracies ap-
proaching
FTB500
Series Turbine Meter requires the use of a linearization con-
ditioner available in all OMEGA instrumentation. Accuracies of
Over the linear flow range, the input/output characteristics takes the form of:
Equation 1
Frequency = C, x Flowrate-C,
The

NOTE
The carrier will not honor any claims unless all shipping material
is saved for their examination. After examining and removing con-
tents, save packing material and carton in the event reshipment
is necessary.
*l% of reading.
In some applications, the fluid viscosity is a known function of temperature
A PC could be used to eliminate the otherwise adverse viscosity effect on
the flow measurement.
SECTION 2 INSTALLATION
2.1 UNPACKING
Remove the Packing list and verify that all equipment has been received.
If there are any questions about the shipment, please call the OMEGA
Customer Service.
Upon receipt of shipment, inspect the container and equipment for any
signs of damage. Take particular note of any evidence of rough handling in
transit. Immediately report any damage to the shipping agent.
FTB500 Series Turbine Meter may be used over wide viscosity ranges,
since the flowmeter has a unique, documented, Universal Viscosity Curve
(abbreviated UVC) which is accurate to
FTB500 Series Flowmeter for operation on a viscous fluid,
it is generally preferable to size the flowmeter so it will be operating in the
higher portion of its range to minimize viscosity effects in the measurement.
Some loss in flow turndown range may be expected.
1.3.3 Viscosity Calibration and UVC Curves
In some flowmeter applications the viscosity is held nearly constant owing
to regulated conditions of temperature and fluid consistency. For such ap-
plications it is only necessary to document the flowmeter ’s performance
at the expected operating viscosity. For such fixed viscosity applications
the standard specifications usually apply.
The
1.3.2 Viscosity Effects
An ideal flowmeter may be defined as one in which the output is solely a
function of the fluid flow being measured. Real flowmeters display
dependencies on secondary fluid properties, such as viscosity temperature,
and/or pressure. These effects tend to obscure or degrade the precision of
the flow measurement.
In very few flowmeter designs, the viscosity dependency is well understood
and given suitable documentation, may be compensated for. The OMEGA
instruments are among this select group.
In selecting an

7
-
2-I. Typical Turbine Meter Installation
METER RUN
V3 = BYPASS VALVE
S = STRAINER
FS = FLOW STRAIGHTENER
TFM = TURBINE FLOWMETER
Figure
Vl, V2 = BLOCKING VALVE
v2
t
TFM
I
FS
2.5V.
Slowly turn the SENSITIVITY threshold control counter-clockwise until in-
dication stops.
2.3
GENERAL
Proper application of the turbine flowmeter requires a suitable piping installa-
tion in order to achieve accurate and reliable operation. Refer to Figure 2-l.
BYPASS RUN
2.2 OPERATION
Perform any purging of piping with spool piece in place. Once completed,
install the flowmeter and connect cabling to pickup coil.
With the FTB500 Mini Flow Signal Conditioner properly installed and
calibrated, verify the following performance.
With the power ON and no flow through the flowmeter, there should be no
pulse output from the unit. To verify this, connect either a digital Frequen-
cy Counter or an AC voltmeter.
If using a Digital Frequency Counter, the display should display zero. If some
other constant or varying indication occurs, noise may be present.
Slowly turn the SENSITIVITY threshold control counter-clockwise until in-
dication stops.
NOTE
Turning the sensitivity control FULLY counter-clockwise will
render the outputs inoperative. Turn potentiometer clockwise to
return to normal operation.
If using an AC voltmeter, the meter should be at zera If noise is present, the
voltmeter will deflect and swing from 0 to