Omega Products FDT100 Installation Manual
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Design, Assembly and Service Manual
Page 1 of 20
Ultrasonic water meter FDT100 series
Contents
1. APPLICATION...................................................................................................................................................2
2. MEASUREMENT METHOD ..............................................................................................................................2
3. TECHNICAL DESCRIPTION ............................................................................................................................2
3.1. Meter characteristics.................................................................................................................................................... 2
3.2. Meter design................................................................................................................................................................... 3
3.2.1. Compact version – basic dimensions.................................................................................................................. 3
3.2.2. Remote version – basic dimensions.................................................................................................................... 3
3.2.3. Ultrasonic sensor unit ............................................................................................................................................ 4
3.2.4. Electronic unit.......................................................................................................................................................... 4
3.2.5. Separate sensor unit – terminal board ................................................................................................................ 6
3.2.6. Meter handling ........................................................................................................................................................ 7
4. TECHNICAL SPECIFICATIONS....................................................................................................................... 8
5. PROJECT DESIGN AND METER INSTALLATION......................................................................................... 9
5.1. Project design of systems including ultrasonic water meters.......................................................................... 9
5.2. Meter installation......................................................................................................................................................... 12
5.2.1. General recommendations.................................................................................................................................. 12
5.2.2. Mechanical fitting.................................................................................................................................................. 13
5.2.3. Electrical connections .......................................................................................................................................... 13
5.2.4. Seals on meters.................................................................................................................................................... 15
6. OPERATIONAL START..................................................................................................................................17
7. OPERATION....................................................................................................................................................18
7.1. Reading the measured quantities from the meter display ............................................................................... 18
7.2. Electrical outputs........................................................................................................................................................ 18
7.2.1. Pulse output .......................................................................................................................................................... 18
7.2.2. Current output ....................................................................................................................................................... 19
7.3. Error identification function..................................................................................................................................... 19
7.4. Battery life and replacement .................................................................................................................................... 19
8. CALIBRATION ................................................................................................................................................20
Design, Assembly and Service Manual
Page 2 of 20
Ultrasonic water meter FDT100 series
1. APPLICATION
Battery-powered ultrasonic water meters of the FDT100 SERIES type series are intended for technological
measurements of instantaneous flow rate and consumption in water-supply networks, and archiving of the measured
data. Measurement of water pressure in piping is also possible. The technical capabilities including high measurement
accuracy and long-term stability over a wide range of measured values make it possible to use the meters, apart from
the conventional measurements, for monitoring leakage and the general condition of water supply networks. The
FDT100 SERIES water meters do not require external power, do not include any moving parts or filters to prevent
choking with mechanical impurities and, compared to conventional water meters, have significantly lower hydraulic
losses.. Flow meters shall be used in standard non-explosive environments.
Any installation of flow meter must be in conformity with technical conditions mentioned in this manual.
2. MEASUREMENT METHOD
The measurement method used is a single-beam pulse transit-time method based on determination of the time
needed for an ultrasonic pulse wave to cross the distance between two probes embedded in piping. Each of the probes
functions as the sender and receiver in turns so that the ultrasonic wave travels in turns in and against the water flow
direction. This arrangement allows for effective elimination of errors due to asymmetry in the probe locations.
3. TECHNICAL DESCRIPTION
3.1. Meter characteristics
The FDT100 SERIES ultrasonic water meter is an electronic device used to measure the water flow rate in a fully
flooded piping. It is manufactured and supplied in two versions: compact and remote. The compact version, designated
FDT100 .SERIES , has the electronic unit attached directly onto the flow sensor housing. The remote version,
designated FDT100-R .SERIES, has the electronic unit separated from the sensor and connected with it by means of a
cable ( length 6m). The electronic unit is accommodated in a separate box that can be fitted on a wall.
In the standard configuration, the meter software allows for measuring and display of the instantaneous flow rate
and total volume of water passed through the meter since the volume counter was last reset. The meter is provided
with a passive pulse output including an optocoupler. The pulse length is 40ms. The meter include passive current
output. The meter is supplied suitable for use in drinking-water supply systems.
3.2. Meter design
ELECTRONIC
CONTROL UNIT
DN
Design, Assembly and Service Manual
Ultrasonic water meter FDT100 series
5,35"(136mm)
ULTRASONIC
SENSOR
S/N 22686/06
ANSI
2"
BN 15 1,45psi
PRESSURE
IMPULSE OUTPUT CONST.
CURRENT OUTPUT
232
5
4-20
psi
G/imp
mA
r
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a
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Page 3 of 20
L
3.2.1. Compact version – basic dimensions
DN
L [inch] / [mm]
S [inch] / [mm]
D [inch] / [mm]
Weight [lb] / [kg]
1¼" (32) 1½" (40) 2" (50) 2½" (65) 3" (80) 4" (100) 5" (125) 6" (150) 8" (200)
10.2/260 11.8/300 11.8/300 11.8/300 13.8/350 13.8/350 13.8/350 13.8/350 13.8/350
7.5/190 7.8/198 8.2/208 8.9/225 9.3/237 10/253 11/280 12/307 14/352
5.5/140 5.9/150 6.5/165 7.3/185 7.9/200 8.7/220 9.8/250 11.2/285 13.4/340
10/4.5 15/7 22/10 24/11 33/15 39/17.5 50/22.5 57/26 80/36.5
3.2.2. Remote version – basic dimensions
3,54"(90mm)
ELECTRONIC
SENSOR
5,35"(136mm)
TERMINAL BOARD
3,15"(80mm)
ULTRASONIC
SENSOR
0,4"(10mm)
0
,
2
2
"
(
5
,
5
3,3"(84mm)
0,15"(4mm)
max. length 5m
m
2
,
m
)
4
"
(
6
1
2,4"(61mm)
)
)
m
m
1
1
(
"
3
4
,
0
)
1
6
(
"
4
,
2
S/N 22686/06
ANSI
2"
BN 15 1,45psi
232
PRESSURE
IMPULSE OUTPUT CONST.
CURRENT OUTPUT
psi
5
G/imp
4-20
mA
y
t
n
r
r
a
w
a
f
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e
D
Design, Assembly and Service Manual
Page 4 of 20
Ultrasonic water meter FDT100 series
DN
L [inch] / [mm]
D [inch] / [mm]
Weight [lb] / [kg]
1¼" (32) 1½" (40) 2" (50) 2½" (65) 3" (80) 4" (100) 5" (125) 6" (150) 8" (200)
10.2/260 11.8/300 11.8/300 11.8/300 13.8/350 13.8/350 13.8/350 13.8/350 13.8/350
5.5/140 5.9/150 6.5/165 7.3/185 7.9/200 8.7/220 9.8/250 11.2/285 13.4/340
11/5 16.5/7.5 23/10.5 25/11.5 34/15.5 40/18 51/23 58/26.5 82/37
3.2.3. Ultrasonic sensor unit
The ultrasonic sensor unit comprises a housing made of ductile cast iron (material according to DIN GGG40) with
two flanges (according to 150# ANSI B) and two embedded ultrasonic probes. The sensor housing is painted with
surface finish of KOMAXIT E 2110 blue powder epoxy paint (RAL 5017). The rating plate attached to the sensor body
includes the basic meter specifications including the sensor size (DN), the accuracy class (B) and the rated constant
flow rate in gallons per minute (q
, the figure next to N) – see the picture below.
P
ULTRASONIC PROBE
ANSI
PRESSURE
IMPULSE OUTPUT CONST.
CURRENT OUTPUT
S/N 22686/06
2"
BN 15 1,45psi
LABEL SENSOR
232
psi
5
G/imp
4-20
mA
y
n
a
t
r
w
r
a
f
i
d
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d
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r
3.2.4. Electronic unit
The electronic unit and battery are placed in an aluminium box with a plastic lid. The box is provided with a special
valve preventing moisture condensation inside the box and up to three grummets for cables of circular cross-section.
The surface finish is by paint of orange hue (RAL 1017).
Two M8 grummets are intended for cables of outside diameter 3.5 to 5mm to be connected to the selected output
signal terminals. On delivery, these grummets are blinded. The third grummet (M12) is provided only in the case of the
remote meter version and is intended for the cable of diameter 6.5 to 8mm connecting the sensor and the remote
electronic unit. The connecting cable is supplied attached to the electronic unit with the other end ready to be
connected to the sensor terminal board.
The meter display is located under the transparent plastic cover. The push-button on the unit box is used to select
the desired display mode: either instantaneous flow rate (in gallons per minute GPM or m
(in thousands of gallons or m
3
) passed through the meter sensor since the volume counter was last reset, or the fluid
pressure (in bar). The actual quantity displayed is indicated at the bottom line by the symbol j. In the case of a meter
failure, the respective error message (E1 through to E5) will be indicated by the same symbol j - see the picture
below. A recess in the unit box is for an optical probe to be applied onto the recessed surface to read the stored data.
Also found under the box lid is the meter rating plate:
3
/hour), the total fluid volume
Design, Assembly and Service Manual
Ultrasonic water meter FDT100 series
Plate including rated parameters in G.10
3
a GPM
Page 5 of 20
ALUMINIUM
HOUSING
DISPLAY
R
OMEGA
E1 E2
FDT 103 XA
RECESS FOR
OPTICAL PROBE
Plate including rated parameters in m3 and m3/hour
3
E4 E5 G.10 GPM
E3
DC 3,6V
IP 67
T 32...122°F
PUSH-BUTTON
CONDENSATION
VALVE
BATTERY
BUSHINGS
ALUMINIUM
HOUSING
PLASTIC
COVER
DISPLAY
R
CONDENSATION
VALVE
OMEGA
E1 E2 E3 E4 E5 m m/h
FDT 103 XA
RECESS FOR
OPTICAL PROBE
IMPORTANT NOTICE: Prior to operational start, check proper tightening of the grummets and blinding of the
unused ones.
3 3
IP 67
T 32...122°F
DC 3,6V
PUSH-BUTTON
BATTERY
BUSHINGS
PLASTIC
COVER
Design, Assembly and Service Manual
Page 6 of 20
Ultrasonic water meter FDT100 series
3.2.5. Separate sensor unit – terminal board
In the case of the remote version of the FDT100 SERIES water meter, attached to the sensor housing is a terminal
board in an aluminium box with a sealed lid. The terminal box is provided with a M12 grommet for a cable of diameter
6.5 to 8mm, a valve preventing moisture condensation inside the box and four spring-loaded WAGO terminals to which
the ultrasonic probes signals are brought. Connected to these terminals are the wires of the cable leading to the remote
electronic unit.
BUSHING
CONNECTING CABLE
TO ELECTRONIC UNIT
WAGO TERMINALS
X2 4 3 2 1
X1
4 3 2 1
CONDENSATION
VALVE
ALUMINIUM
BOX
BOX
LID
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