For best results, take the time to fully acquaint yourself with all information about all
components of your FTB790 Series Turbine
Meter System prior to installation and use. If
you need assistance, contact the Omega Flow
Application Department.
This symbol is used throughout the
!
manual to call your attention to safety
▲
messages.
Warnings alert you to the potential for per-
sonal injury.
Cautions call your attention to practices or
procedures which may damage your
equipment.
Notes give information that can improve
efciency of operations.
It is your responsibility to make sure that all
operators have access to adequate instructions about safe operating and maintenance
procedures.
This manual will assist you in installing and
maintaining your FTB790 Series turbine meter
and associated display electronics. The turbine
meters can be purchased with or without the
display electronics. (See Figure 1)
Figure 1
Turbine Housing
Display Electronics
When purchased with the display electronics,
optional accessory modules are available for
eld installation. Information on these accessories is contained in separate manuals. Calibration details using the display electronics
are given in this manual.
When purchased without the display (Sufx ND) an optional eld installable Pulse Output
Module (FLSC790-P-ND) is available and
described in a separate manual.
Read Me!
For your safety, review the major warnings
and cautions below before operating your
equipment.
1. This equipment is approved to handle only
uids which are compatible with all wetted
materials.
2. When measuring ammable liquids, ob-
serve precautions against re or explosion.
3. When handling hazardous liquids, always
follow the liquid manufacturer’s safety
precautions.
4. When working in hazardous environments,
always exercise appropriate safety precautions.
5. Always dispose of used cleaning solvents
in a safe manner according to the solvent
manufacturer’s instructions.
6. During turbine removal, liquid may spill.
Follow the liquid manufacturer’s safety
precautions for clean up of minor spills.
7. Do not blow compressed air through the
turbine.
8. Do not allow liquids to dry inside the
turbine.
1
Page 4
9. Handle the rotor carefully. Even small
scratches or nicks can affect accuracy.
10. When tightening the turbine, use a wrench
only on the wrench ats.
11. For best results, always verify accuracy
before use.
PRODUCT DESCRIPTION
FTB790 Series Turbines are identied by the
internal diameter of the inlet and outlet.
FTB791 – 1/2 inch (Mid Flow)
FTB792 – 3/4 inch (Mid Flow)
FTB793 – 1 inch (Mid Flow)
FTB794 – 1-1/2 inch (High Flow)
FTB795 – 2 inch (High Flow)
Each of these turbines are designed to work
with on-board display electronics and/or with
one of several accessory modules that can
interface to a wide variety of reporting and
collecting devices.
The CMOS microprocessor-based electronics
have extremely low power requirements and
data retention capabilities in both RAM and
ROM. Information is clearly displayed on
a large 6-digit LCD readout with two-point
oating decimal for totals from .01 to 999,999.
All operations are easily accessed with the two
buttons on the front panel.
Liquids flow through the turbine housing
causing an internal rotor to spin. As the rotor
spins, an electrical signal is generated in the
pickup coil. The electrical signal provides
the output necessary to operate the on-board
display electronics for local indication directly
on the turbine or one of several accessory
modules that transmit the signal to external
equipment.
Upon receipt, examine your meter for visible
damage. The turbine is a precision measuring
instrument and should be handled as such.
Remove the protective plugs and caps for
a thorough inspection. If any items are damaged or missing, contact OMEGA Customer
Service.
Make sure the turbine model meets your specic needs. Refer to the Specications Section
and conrm the following:
1. The owrate is within the limits of your
model.
2. The liquid is compatible with the turbine’s
wetted components.
3. The system’s pressure does not exceed
the turbine’s maximum pressure rating.
Information specic to your particular turbine,
including serial number, model number,
manufacturing date, and K-factor is etched
into the surface of the turbine. On Models
FTB791, FTB792, and FTB793 find the
etched information on the side of the turbine.
On Models FTB794 and FTB795 the information is etched on a wrench at.
SN = Serial Number, a 7-8 digit number that
identies this particular turbine.
MOD = Model number.
KF = K‑Factor given in pulses per gallon
(PPG).
MFD = Manufacturing Date indicating the
week and year of manufacture.
For your future reference, it might be useful to
record this information in the manual in case
it becomes unreadable on the turbine.
INSTALLATION
All Series FTB790 turbines are designed to
measure ow in only one direction. The direction is indicated by the arrow cast-molded in
the turbine outlet. If the opposite direction is
desired, and you are using on-board display
electronics, rotate the display electronics 180
degrees prior to installation.
Flow altering devices such as elbows, valves,
and reducers can affect accuracy. The following recommended guidelines are given to
enhance accuracy and maximize performance.
Distances given here are minimum requirements; double them for desired straight pipe
lengths.
Upstream from the turbine, allow a minimum
straight pipe length at least 10 times the internal diameter of the turbine. For example,
with the FTB793 turbine, there should be 10
inches (25.4 cm) of straight pipe immediately
upstream. The desired upstream straight pipe
length is 20 inches (50.8 cm).
2
Page 5
Downstream from the turbine, allow a minimum straight pipe length at least 5 times the
internal diameter of your turbine. For example, with the FTB793 turbine, there should
be 5 inches (12.7 cm) of straight pipe immediately downstream. The desired downstream
distance is 10 inches (25.4 cm).
A typical back pressure of 5 to 50 PSI (0.34 to
3.4 bar) will prevent cavitation. Create back
pressure by installing a control valve on the
downstream side of the meter at the proper
distance detailed above.
Foreign material in the liquid being measured
can clog the turbine’s rotor and adversely affect accuracy. If this problem is anticipated or
experienced, install screens to lter impurities
from incoming liquids.
Models FTB791, FTB792, FTB793
Maximum Particulate Size
Inches: 0.005
Microns: 125
Mesh: 55
Standard Sieve: 125 µm Alternative Sieve: No. 120
Models FTB794 and FTB795
Maximum Particulate Size
Inches: 0.018
Microns: 500
Mesh: 28
Standard Sieve: 500 µm
Alternative Sieve: No. 35
All Series FTB790 turbines are Factory Mutual Approved and carry a Class 1, Division 1
Approval for hazardous environments. They
are tested and calibrated at the factory using
state-of-the-art calibration procedures and
test equipment.
To ensure accurate measurement, remove all
air from the system before use. To purge the
system of air:
1. Ensure some back pressure on the turbine.
2. Open the discharge valve or nozzle and
allow uid to completely ll the system.
Make sure the stream is full and steady.
3. Close the discharge valve or nozzle.
4. Start normal operations.
Each turbine contains a removable back coverplate. Leave the coverplate installed unless
accessory modules specify removal.
CONNECTIONS
1. To protect against leakage, seal all threads
with an appropriate sealing compound.
Make sure the sealing compound does
not intrude into the ow path.
2. Make sure the arrow on the outlet is
pointed in the direction of the ow.
3. Tighten the turbine onto the ttings. Use
a wrench only on wrench ats.
NOTE: If connecting to new male threads,
burrs and curls can adversely effect
accuracy. Correct the problem prior to
turbine installation.
It is strongly recommended that accuracy be
veried prior to use. To do this, remove all
air from the system, measure an exact known
volume into an accurate container, and verify
the volume against the readout or recording
equipment. If necessary, use a correction
factor to gure nal volume. For best results,
accuracy should be veried periodically as
part of a routine maintenance schedule.
The display electronics is normally installed
on the turbine housing at the factory unless
ordered without it.
If for any reason the display electronics
need to be mounted on your turbine, simply
mount the display on the turbine with the four
screws at the corners of the faceplate. Make
sure the seal is fully seated before tightening
the screws.
If you ordered the FTB790 Series turbine with
an accessory module, please review and thoroughly understand all installation instructions
before proceeding.
Avoid electronically “noisy” environments.
Install at least 6 inches (15.2 cm) away from
motors, relays, or transformers.
3
Page 6
OPERATIONS
All operations are reected in the LCD readout. The large center digits indicate amounts,
where smaller words or “icons” located above
and below indicate specific information
regarding totals, ow, calibration and units
of measure.
Flowrate Feature
To use this feature, press and release DISPLAY button until FLOWRATE icon appears.
The factory set time base will be highlighted
to the right of FLOWRATE (M = Minutes,
H = hours, D = days). When FLOWRATE is
invoked, the display will be indicating rate
of ow.
Activate the Meter
The computer is on continuously and always
ready to perform. The computer is powered
by eld replaceable batteries. When display
becomes dim, faded or the low battery message appears (see below), the batteries need
to be replaced. Reference the Maintenance
Section for details.
Batch and Cumulative Totals
The computer maintains two totals.The Cumulative Total provides continuous measurement
and cannot be manually reset. The Batch Total
can be reset to measure ow during a single
use. The Cumulative Total is labeled TOTAL
1, Batch Total is labeled TOTAL 2 BATCH.
When the Cumulative Total reaches a display
reading of 999,999 the computer will highlight
an X10 icon. This indicates to the operator that
a zero must be added to the 6 digits shown.
When the next rollover occurs, the computer
will highlight an X100 icon. This indicates to
the operator that two zeroes must be added to
the 6 digits shown.
Press the DISPLAY button briey to switch
between the TOTAL 1, TOTAL 2 BATCH
and FLOWRATE. Press DISPLAY briey
to display the TOTAL 2 BATCH. Hold the
DISPLAY button for 3 seconds to reset the
Batch Total to zero.
When uid is owing through the meter, a
small propeller icon is highlighted.
Factory and Field Calibration
All calibration information is visible to the
user as icons on the top line of the display,
above the numeric digits.
All units are congured with a “factory”
calibration. Both gallons and litres are available (“GL” or “LT” will be displayed). While
holding the CALIBRATE button, briey press
DISPLAY to toggle between gallons and litres.
This factory calibration (indicated with FAC)
is permanently programmed into the computer
and is not user adjustable.
NOTE: Your computer may have other units of
measure programmed into it. If so, holding
the CALIBRATE button and momentarily
pressing the DISPLAY button will toggle
through all factory set units. Other possible units are: IGL (imperial gallon), QT
(quart), CF (cubic feet), CM (cubic meter),
BL (42 gal. barrel), CC (cubic centimeter)
or OZ (ounce).
Switching between different units will not
corrupt the Total’s contents. For example, in
GL mode, the computer totalizes 10.00 gallons,
if the user switches to LT mode, the display
will read 37.85 litres (the same volume, different unit).
The “eld” calibration may be set by the user,
and can be changed or modied at any time
using the calibration procedure described in
the Calibration Section. Totals or owrate
derived from the eld calibration are invoked
when the FAC icon is no longer visible on the
top line of the display.
4
Page 7
CALIBRATION
Verify Accuracy Before
Beginning Field Calibration
For the most accurate results, dispense at a
owrate which best simulates your actual operating conditions. Avoid “dribbling” more uid
or repeatedly starting and stopping the ow.
This can result in less accurate calibrations.
Make sure you meet the meter’s minimum
owrate requirements:
1/2 inch meter 1 GPM (3.8 LPM)
3/4 inch meter 2 GPM (7.5 LPM)
1 inch meter 5 GPM (18.8 LPM)
1-1/2 inch meter 10 GPM (37.5 LPM)
2 inch meter 20 GPM (76 LPM)
The use of a uniformly dependable, accurate
calibration container is recommended for the
most accurate results. Due to high owrate,
it is strongly recommended that calibration
be completed with a combination of volume
and weight using ne resolution scales. For
best results, the meter should be installed and
purged of air before eld calibration.
Field Calibration with
Computer Display
Field Calibration and Factory Calibration
are dened in the Operation Section. Factory
calibration settings are programmed into each
computer during manufacturing, using stoddard test solvent at 70° F (21° C). Settings
are correct for light liquids such as water,
gasoline or diesel. Readings using the Factory
Calibration (FAC) may not be accurate in some
situations, for example, “heavy” liquids such
as motor oil under extreme temperature conditions, non-standard plumbing congurations
or with uids other than water.
For improved accuracy under such conditions,
the computer allows for “eld” calibration, that
is, user entry of custom calibration parameters.
A “single point” calibration may yield acceptable accuracy when used in a non-standard
application.
Field Calibration Procedures
(Dispense/Display Method)
1. To eld calibrate, press and hold the CALIBRATE and DISPLAY buttons for about
3 seconds until you see FLdCAL. Release
both buttons and you will see dd000.0. You
are now in the eld calibration mode.
2. Dispense a known amount of uid at a
owrate representative of the application.
Any amount between 000.1 and 999.9
units can be used. Display will count up
while uid is owing through the meter.
3. The DISPLAY button can then be pushed
to select the digit location and the CALIBRATE button can be pushed to scroll
the desired value at the blinking position.
Edit the amount shown with the value that
was dispensed above. Values from 000.1
to 999.9 can be entered.
4. When satised with the value, press both
CALIBRATE and DISPLAY buttons simultaneously. CALEnd will be displayed
and unit will go back to normal operation,
less the FAC (factory calibration) icon.
5. The meter will now be operating with a
custom calibration number unique to the
above dispense procedure. No unit of
measure (gallon, litre, etc.) icon will be
highlighted
NOTE: To return to factory calibration (FAC),
press and hold both CALIBRATION and
DISPLAY buttons for about 3 seconds,
until FAcCAL is displayed. Then release
buttons. Unit should return to normal
operation and FAC icon visible
NOTE: If the eld calibration mode is entered
and NO uid is dispensed, then upon leaving, the computer will use data from the
last successful eld calibration.
5
Page 8
MAINTENANCE
Verify Accuracy
Before use, check the turbine’s accuracy and
verify calibration.
1. Make sure there is no air in the system.
2. Measure an exact known volume into an
accurate container.
3. Verify the volume against the readout or
recording equipment.
NOTE: If necessary, use a correction factor to
gure nal volume.
For best results, accuracy should be veried
periodically as part of a routine maintenance
schedule.
Remove the Turbine
!!!WARNING!!!
!
▲
▲
During turbine removal, liquid may spill.
Follow the liquid manufacturer’s safety
precautions for clean up of minor spills.
1. Ensure all liquid is drained from the tur-
bine. Wear protective clothing as necessary.
2. Loosen both ends of the turbine. Use a
wrench only on the turbine’s wrench ats.
3. If the turbine is not immediately installed
again, cap lines as necessary.
2. Carefully clean residue off all parts. Remove internal parts as detailed above. Note
orientation carefully for correct assembly.
Internal parts can be soaked for 10-15
minutes in compatible cleaning solutions.
Use a soft brush or small probe to carefully
remove residue from the rotor.
3. Using a small tool such as a screw driver
or awl, gently pry one retaining ring from
its groove. Remove the support. If necessary, use needle nose pliers. Little or no
force should be required.
4. Carefully remove the rotor.
CAUTION: Handle the rotor care fully.
Even small scratches or nicks can affect
accuracy.
5. Turn the turbine over and remove the other
retaining ring. Remove the other support.
6. Clean, as detailed below, or discard as
necessary.
7. Replace one support and retaining ring.
Parts should drop easily into place with
little or no force.
8. Install the rotor. Make sure the wide end
of the rotor’s blades faces the ow direction. (See Figure 3)
Figure 3
Wide End of Rotor Blade
Replace Internal Parts
1. Remove the turbine from the system as
detailed above.
NOTE: Carefully notice the orientation of
all internal parts as they are removed,
especially the orientation of the rotor to
the ow direction arrow. (See Figure 2)
Figure 2
Support
Rotor
Retaining Ring
6
Support
Retaining Ring
Flow Direction Arrow
9. Turn the turbine over and drop the second
support into place. Put the nal retaining
ring into position.
10. Reinstall the turbine, purge the system of
air, and verify accuracy before use.
Page 9
Clean the Turbine
During use, the turbine should be kept full
of liquid to ensure that drying does not occur
inside the turbine. If drying or caking should
occur, the rotor will stick or drag, affecting
accuracy. To determine if the rotor is stuck or
dragging, gently blow air through the meter
and listen for the quiet whir of the rotor.
CAUTION: Never blow compressed air
through the meter. It could damage the
rotor.
1. Remove the turbine from the system following the directions above.
!!!WARNING!!!
!
▲
▲
Follow the liquid manufacturer’s instruc‑
tions for the disposal of contaminated
cleaning solvents.
2. When the rotor turns freely, assemble and
install it again following the instructions
above.
Display Electronics
The display electronics are powered by
lithium batteries which provide at least 4
years of actual use. If the meter’s readout
should become dim, blank or the low battery
message appears (see below), the batteries
should be replaced. Replacement batteries
can be ordered from the factory. See details
in the Parts Section.
Replacing the Batteries
1. Remove the corner screws from the meter
face and lift the display electronics from
the turbine.
2. Remove the batteries.
3. Check the battery terminals and remove
any corrosion.
4. Install the new batteries and make sure
the positive posts are positioned correctly.
When the batteries are installed correctly,
the computer powers on automatically
and the readout displays information.
5. Make sure the seal is fully seated before
placing the computer electronics on the
turbine. Tighten the four screws.
When batteries are disconnected or fail,
values in Batch and Cumulative Totals will
remain. Factory and Field Calibration Curves
are retained in the meter’s computer when
power is lost.
It is strongly recommended that battery check
and terminal cleaning be a part of a routine
maintenance schedule. Battery terminals
should be cleaned annually. Batteries can be
replaced without removing the meter from the
piping system.
7
Page 10
TROUBLESHOOTING
Symptom Probable Cause Corrective Action
Meter is not accurate 1. Field Calibration not perform- Field calibrate again or select Factory
ed properly Calibration.
2. Factory Calibration not suit- Perform a Field Calibration according to
able for liquid being measured Calibration Section.
3. Meter operated below mini- Increase owrate.
mum owrate
4. Meter partially clogged with Remove meter. Clean carefully. Make sure
dried liquid rotor spins freely.
5. Turbine bearings partially Remove meter. Clean carefully. Make sure
clogged with dried liquid rotor spins freely.
6. Sealant material wrapped Remove meter. Make sure rotor spins freely.
around rotor
7. Installed too close to ttings Install correctly.
8. Installed too close to motors Install correctly.
or electrically “noisy” envi ronment
9. Improper connections to Check all electrical connections. Reference
recording device appropriate installation instructions.
Readout faded or 1. Batteries weak, dead, or not Remove display electronics. Check and
blank connected replace batteries if necessary.
2. Display electronics defective Contact the factory.
Normal owrate 1. Field Calibration not perform- Field Calibrate again or select Factory
but meter does not ed correctly Calibration.
count (Meter comes
2. Rotor stuck or damaged Remove meter. Make sure rotor spins freely.
on when DISPLAY
button pushed)
3. Sealant material wrapped Remove meter. Make sure rotor spins freely.
around rotor
4. Display electronics defective Contact the factory.
Reduced owrate 1. Meter clogged with dried Remove meter. Clean carefully. Make sure
and meter does not liquids rotor spins freely.
count (Meter comes
on when DISPLAY 2. Below minimum owrate Increase ow.
button pushed)
8
Page 11
SPECIFICATIONS - STAINLESS STEEL
All data on Models FTB791, FTB792, and FTB793 determined with 1 centipoise stoddard
solvent test uid at 70° F (21° C). Data on Models FTB794 and FTB795 is determined with
water at 70° F (21° C).
Models FTB791 FTB792 FTB793 FTB794 FTB795
Size 1/2 in. 3/4 in. 1 in. 1‑1/2 in. 2 in.
Linear Flow Range
Gallons/minute (GPM) 1-10 2-20 5-50 10-100 20-200
Liters/minute (LPM) 3.8-37.9 7.6-75.7 18.9-190 38-380 76-760
Fluid Velocity
in Extended Range
Feet/second 0.5-10.6 0.6-12.1 0.93-18.6 0.8-15.9 0.96-19.1
Meters/second 0.2-3.2 0.2-3.7 0.28-5.7 0.24-4.8 0.29-5.8
Maximum Pressure Drop
in 10:1 Range
PSIG 8 7.5 5 4 4
bar 0.55 0.5 0.34 0.28 0.28
Frequency Range in
Linear Flow Range 45-450 Hz 37-370 Hz 45-475 Hz 35-350 Hz 33-330 Hz
Connections
NPT Female Inlet/Outlet Size 1/2 in. 3/4 in. 1 in. 1-1/2 in. 2 in.
Wrench Size:
Inch 1-1/16 in. 1-5/16 in. 1-5/8 in. 2-3/8 in. 3 in.
Millimeter 27 mm 33 mm 41 mm 60 mm 75 mm
Weight*
Pounds 1.8 lbs. 2.0 lbs. 2.4 lbs. 4.0 lbs. 6.3 lbs.
Kilograms 0.8 kg 1.0 kg 1.1 kg 1.8 kg 2.9 kg
* Display electronics add 0.2 lbs. (0.1 kg) to total weight.
9
Page 12
SPECIFICATIONS - STAINLESS STEEL continued
Performance
Linear Range for 1/2 in. and 3/4 in.: 10:1 @ ±2.0% of reading
Linear Range for 1 in.: 10:1 @ ±1.5% of reading
Linear Range for 1-1/2 in. and 2 in: 10:1 @ ±1.0% of reading
Extended Range: 20:1 @ ±5.0% of reading
Repeatability: ±0.1%
Temperature RangeTurbine only without computer: -40° to +250° F (-40° to +121° C)
Turbine with display electronics: 0° to +140° F (-18° to +60° C)
(Display electronics or accessory modules determine nal operational temperature.)
A
B
Dimensions
Models FTB791 FTB792 FTB793 FTB794 FTB795
Size 1/2 in. 3/4 in. 1 in. 1‑1/2 in. 2 in.
A = Height:
Inches 1.8 in. 2.0 in. 2.2 in. 2.8 in. 3.2 in.
Centimeters 4.6 cm 5.1 cm 5.6 cm 7.1 cm 8.2 cm
B = Width
Inches 2.0 in. 2.0 in. 2.0 in. 2.7 in. 3.3 in.
Centimeters 5.1 cm 5.1 cm 5.1 cm 6.9 cm 8.4 cm
C = Length
Inches 4.2 in. 4.3 in. 4.5 in. 5.3 in. 6.3 in.
Centimeters 10.7 cm 10.9 cm 11.4 cm 13.5 cm 16.0 cm
Display electronics add 0.7 in. (1.8 cm) to height of turbine.
10
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Page 13
SPECIFICATIONS - BRASS
All data on FTB791-BRASS, FTB792-BRASS, and FTB793-BRASS determined with
1 centipoise stoddard solvent test uid at 70° F (21° C). Data on FTB794-BRASS and FTB795BRASS is determined with water at 70° F (21° C).
Models FTB791‑ FTB792‑ FTB793‑ FTB794‑ FTB795‑
BRASS BRASS BRASS BRASS BRASS
Size 1/2 in. 3/4 in. 1 in. 1‑1/2 in. 2 in.
Linear Flow Range
Gallons/minute (GPM) 1-10 2-20 5-50 10-100 20-200
Liters/minute (LPM) 3.8-37.9 7.6-75.7 18.9-190 38-380 76-760
Fluid Velocity
in Extended Range
Feet/second 0.5-10.6 0.6-12.1 0.93-18.6 0.8-15.9 0.96-19.1
Meters/second 0.2-3.2 0.2-3.7 0.28-5.7 0.24-4.8 0.29-5.8
Maximum Pressure Drop
in 10:1 Range
PSIG 8 7.5 5 4 4
bar 0.55 0.5 0.34 0.28 0.28
Frequency Range in
Linear Flow Range 45-450 Hz 37-370 Hz 45-475 Hz 35-350 Hz 33-330 Hz
Connections
NPT Female Inlet/Outlet Size Yes Yes Yes Yes Yes
Female Yes Yes Yes Yes Yes
Inlet/Outlet Size 1/2 in. 3/4 in. 1 in. 1-1/2 in. 2 in.
Wrench Size:
Inch 1-1/16 in. 1-5/16 in. 1-5/8 in. 2-3/8 in. 3 in.
Millimeter 27 mm 33 mm 41 mm 60 mm 75 mm
Weight*
Pounds 2.0 lbs. 2.3 lbs. 2.7 lbs. 6.0 lbs. 9.6 lbs.
Kilograms 0.9 kg 1.0 kg 1.2 kg 2.7 kg 4.3 kg
* Computer electronics add 0.2 lbs. (0.1 kg) to total weight.
11
Page 14
SPECIFICATIONS - BRASS continued
Performance
Linear Range for 1/2 in. and 3/4 in.: 10:1 @ ±2.0% of reading
Linear Range for 1 in.: 10:1 @ ±1.5% of reading
Linear Range for 1-1/2 in. and 2 in: 10:1 @ ±1.0% of reading
Extended Range: 20:1 @ ±5.0% of reading
Repeatability: ±0.1%
Temperature RangeTurbine only without computer: -40° to +250° F (-40° to +121° C)
Turbine with display electronics: 0° to +140° F (-18° to +60° C)
(Display electronics or accessory modules determine nal operational temperature.)
A
B
Dimensions
Models FTB791‑ FTB792‑ FTB793‑ FTB794‑ FTB795‑
BRASS BRASS BRASS BRASS BRASS
Size 1/2 in. 3/4 in. 1 in. 1‑1/2 in. 2 in.
A = Height:
Inches 1.8 in. 2.0 in. 2.2 in. 2.8 in. 3.2 in.
Centimeters 4.6 cm 5.1 cm 5.6 cm 7.1 cm 8.2 cm
B = Width
Inches 2.0 in. 2.0 in. 2.0 in. 2.7 in. 3.3 in.
Centimeters 5.1 cm 5.1 cm 5.1 cm 6.9 cm 8.4 cm
C = Length
Inches 4.2 in. 4.3 in. 4.5 in. 5.3 in. 6.3 in.
Centimeters 10.7 cm 10.9 cm 11.4 cm 13.5 cm 16.0 cm
Computer electronics add 0.7 in. (1.8 cm) to height of turbine.
12
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Page 15
SPECIFICATIONS continued
Display Specifications
Input Pulse Rate:
Minimum Pulse In: DC
Minimum Coil Input: 10 Hz
Maximum Raw: 1,000 Hz
K‑Factor:
Minimum: .01 pulses/unit
Maximum: 999,999 pulses/
unit
Field Calibration:
Minimum Time: 10 seconds
Readout Totals:
Minimum Display: 0.01
Maximum Display: 999,999
Temperatures:
Operational: 0° to +140° F
(-18° to +60° C)
Storage: -40° to +158° F
(-40° to +70° C)
If wider operating temperature ranges
are desired, reference information on
Remote Kits.
Power:
Internal Power Supply: 2 Lithium
Batteries at
3 volts each
Battery Life: 5 years
Optional External Power: 7-30 VDC
Display Electronics Terminal
Connections
J 1
J 10
J‑1 Reset
When connected by a jumper wire
to Ground (J1-6), this has the same
effect as initial power up and zeroes
out all totalizers.
J‑2 Pulse Signal Output
This supplies a high-level amplied
open collector signal. Output will
withstand a maximum open-circuit
voltage of 60 volts DC and a maximum closed-circuit of 100 mA.
J‑3 Not Used
J‑4 Pulse Signal Input
Requires a sine or square wave with
open-circuit voltage of 3-30 volts
P-P, a maximum rise/fall rate of
0.01 V/µ second and a maximum
frequency of 750 Hz.
J‑5 Power Input
When used with Ground (J1-6),
this has reverse polarity protection,
but no on-board voltage regulation.
Supplied voltage must be 5.75 volts
DC ±5%.
J‑6 Ground
J‑7, 8, Programming interfaces. Not access-
9, 10 able to user.
NOTE: Safety approvals are void if any
external connections are made to
computer electronics.
13
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SPECIFICATIONS continued
MODEL NUMBERS - STAINLESS STEEL
Extended
Model No. Model No.* Range Range FNPT
w/Display w/o Display GPM (LPM) Low Flow† Size
FTB791 FTB791-ND 1-10 0.5 1/2"
(3.8-37.9) (1.9)
FTB792 FTB792-ND 2-20 1 3/4"
(7.6-75.9) (3.8)
FTB793 FTB793-ND 5-50 2.5 1"
(19-190) (9.5)
FTB794 FTB794-ND 10-100 5 1-1/2"
(38-380) (9.0)
FTB795 FTB795-ND 20-200 10 2"
(76-760) (38)
* Requires signal output module P/N - FLSC790-P-ND ordered separately.
† Extended low ow range and eld calibration for viscosity available on - ND units w/o display.
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MODEL NUMBERS - BRASS
Extended
Model No. Model No.* Range Range FNPT
w/Display w/o Display GPM (LPM) Low Flow† Size
* Requires signal output module P/N - FLSC790-P-ND ordered separately.
† Extended low ow range and eld calibration for viscosity available on - ND units w/o display.
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PARTS & ACCESSORIES
Order Replacement Kits with the part numbers given here.
FLSC790-MA 4-20 mAdc Output Module
FLSC790-P Pulse Output Module (open collector output)
FLSC790-P-DC External Power Module for FLSC790-P (9-30Vdc)
FTB790-RK Remote Display Kit Module
FTB790-RK-FM FM Approved Remote Display Kit Module
FLSC790-BATT Replacement Batteries
FLSC790-P-ND Pulse Output for Models without Displays (-ND sufx) (open collector output)
Except as noted, Options and Accessories are for Display Models only and only one Module may be installed per unit.
All models are supplied with 10 ft. cable. Cable may be cut or extended as required. Customer supplied pull-up resistor
required, 820 ohm (min).
16
Page 19
Page 20
M-4908/0410
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