
IN-LINE ULTRASONIC FLOWMETER
FDT100 Series
Starts at
$
2538
Standard
⻬ Economical 
Ultrasonic Flowmeter 
for Water Service
⻬ Battery Powered 
⻬ Displays Flow Rate 
and Total 
⻬ Extended Low 
Flow Range
⻬ Virtually No 
Pressure Loss
⻬ No Moving Parts for 
Long Life
⻬ NIST 3-Point 
Calibration Included
The FDT100 Series comprises 
advanced-technology water 
flowmeters. This series uses 
transit-time ultrasonic technology in 
which the signal is transmitted and 
received alternately between 2 flow 
sensors and the “time of flight” 
determines the flow rate. The 
battery-powered transmitter comes 
in the user’s choice of an integrally 
mounted display or a remote-mount 
version. Applications include both 
commercial and consumable water 
measurement. Long-term stability 
and a wide measurement range 
make it possible not only to 
measure water consumption, but 
also to monitor systems for water 
leakage. Because the FDT100 
Series has no moving parts, system 
pressure loss is minimal and 
filtration is not required. Display flow 
rate or total at the push of a button. 
Installation is aided by 150-lb ANSI 
flanges in sizes from 2 to 8".
SPECIFICATIONS 
Accuracy: ±2% of reading;
±5% below minimum transition rate
Fluid Temperature:
0 to 50°C (32 to 122°F)
Maximum Pressure: 230 psig 
Enclosure:
IP67 (integral mount version)
Electronic Housing:
Aluminum alloy with plastic cover
Display:
7-segment, 8-digit, single-line LCD
ANSI Flange Size 221⁄2 34568 
Overload Flow Rate qs[GPM] 130 220 350 530 880 1320 1585 
Nominal Flow Rate qp[GPM] 65 110 175 265 440 660 1100 
Transitional Flow Rate qt[GPM] 13 22 35 53 88 132 220 
Minimum Flow Rate q 
Pulse Output Constant k
DIN Flange Size 
Overload Flow 
Rate qs[m3/h] 
Nominal Flow 
Rate qp[m3/h] 
Transitional Flow 
Rate qt[m3/h] 
Minimum Flow 
Rate q
min
Pulse Output 
Constant ki[l/pulse]
FDT103, $2538, shown 
smaller than actual size.
min
32 40 50 65 80 100 125 150 200
12 20 30 50 80 120 200 300 360
0.48 0.8 35812 20 30 50
[m3/h]
0.12 0.2 0.45 0.75 1.2 1.8 3 4.5 7.5
10 25 25 50 50 100 100 100 100
E-X
Remote 
display 
shown 
smaller than 
actual size
Current Output: 4 to 20 mA/DC current
(requires 8 to 24 Vdc supply)
Open Collector Output:
5 to 30 Vdc, 1 mA max
Flange: ANSI 150# or DIN 
Meter Body: Cast iron 
Power Supply:
Internal 3.6V battery (included), 
1 to 2 year life
ANSI Size Rate Information
[GPM] 2 3.3 5.3 8 13.2 20 33
[gal/pulse] 5 10 10 15 30 30 30
i
DIN Size Rate Information
6 10 15 25 40 60 100 150 250

ULTRASONIC
SENSOR
ELECTRONIC 
CONTROL UNIT
PRESSURE 
CURRENT OUTPUT 
IMPULSE OUTPUT CONST. 
warranty 
removed 
void if 
G/imp 
ANSI 
S/N 22686/06 
BN 15     1,45psi 
mA 
psi 
232 
 5 
4-20 
2" 
 136 (5.4)
S
L
D
DN
warranty 
removed
void if
G/imp
ANSI
S/N 226 86 /06
BN 15     1,45psi
mA
psi
232 
 5
4-20
2"
D
max length: 5 m (16.4')
ELECTRONIC 
SENSOR
ULTRASONIC
SENSOR
TERMINAL BOARD
PRESSURE
CURRENT OUTPUT
IMPULSE OUTPUT CONST.
DN
 61 (2.4) 
5.5 (0.2)
4 (0.2)
90 (3.5)
80 (3)
10 (0.4)
61 (2.4)
136
(5.4)
84
(3.3)
11 (0.4)
61 (2.4)
LL
Dimensions: mm (in)
ø = diameter
Compact Version—Basic Dimensions
DN 32 (13⁄4) 40 (11⁄2) 50 (2) 65 (21.2) 80 (3) 100 (4) 125 (5) 150 (6) 200 (8) 
L: mm (in) 260 (10.2) 300 (11.8) 300 (11.8) 300 (11.8) 350 (13.8) 350 (13.8) 350 (13.8) 350 (13.8) 350 (13.8) 
S: mm (in) 190 (7.5) 198 (7.8) 208 (8.2) 225 (8.9) 237 (9.3) 253 (10) 280 (11) 307 (12) 352 (14) 
D: mm (in) 140 (5.5) 150 (5.9) 165 (6.5) 185 (7.3) 200 (7.9) 220 (8.7) 250 (9.8) 285 (11.2) 340 (13.4) 
Weight: kg (lb) 4.5 (10) 7 (15) 10 (22) 11 (24) 15 (33) 17.5 (39) 22.5 (50) 26 (57) 36.5 (80)
E
Dimensions: mm (in)
ø = diameter
Remote Version—Basic Dimensions
DN 32 (13⁄4) 40 (11⁄2) 50 (2) 65 (21.2) 80 (3) 100 (4) 125 (5) 150 (6) 200 (8) 
L: mm (in) 260 (10.2) 300 (11.8) 300 (11.8) 300 (11.8) 350 (13.8) 350 (13.8) 350 (13.8) 350 (13.8) 350 (13.8) 
D: mm (in) 140 (5.5) 150 (5.9) 165 (6.5) 185 (7.3) 200 (7.9) 220 (8.7) 250 (9.8) 285 (11.2) 340 (13.4) 
Weight: kg (lb) 5 (11) 7.5 (16.5) 10.5 (23) 11.5 (25) 15.5 (34) 18 (40) 23 (51) 26.5 (58) 37 (82)
E-X

Remote 
display
FDT103-R, $2816, shown 
smaller than actual size.
shown 
smaller than 
actual size
MOST POPULAR MODELS HIGHLIGHTED!
MOST POPULAR MODELS HIGHLIGHTED!
To Order (Specify Model Number)
150# ANSI
Flange Size
Model No. Price cm (in) Description
FDT103  $2538  5 (2) Battery-powered ultrasonic flowmeter 
FDT104 2625 6.3 (2.5) Battery-powered ultrasonic flowmeter 
FDT105 2729 7.6 (3) Battery-powered ultrasonic flowmeter 
FDT106 2816 10.2 (4) Battery-powered ultrasonic flowmeter 
FDT107 2886 12.7 (5) Battery-powered ultrasonic flowmeter 
FDT108 3112 15.2 (6) Battery-powered ultrasonic flowmeter 
FDT109 3685 20.3 (8) Battery-powered ultrasonic flowmeter 
FDT103-R 2816 5 (2) Battery-powered ultrasonic flowmeter with remote display 
FDT104-R 2990 6.3 (2.5) Battery-powered ultrasonic flowmeter with remote display 
FDT105-R 3094 7.6 (3) Battery-powered ultrasonic flowmeter with remote display 
FDT106-R 3181 10.2 (4) Battery-powered ultrasonic flowmeter with remote display 
FDT107-R 3251 12.7 (5) Battery-powered ultrasonic flowmeter with remote display 
FDT108-R 3476 15.2 (6) Battery-powered ultrasonic flowmeter with remote display 
FDT109-R 4050 20.3 (8) Battery-powered ultrasonic flowmeter with remote display
Model No. Price DIN Size Description
FDT101-DIN $2451 32 Battery-powered ultrasonic flowmeter 
FDT102-DIN 2503 40 Battery-powered ultrasonic flowmeter 
FDT103-DIN 2555 50 Battery-powered ultrasonic flowmeter 
FDT104-DIN 2625 65 Battery-powered ultrasonic flowmeter 
FDT105-DIN 2729 80 Battery-powered ultrasonic flowmeter 
FDT106-DIN 2816 100 Battery-powered ultrasonic flowmeter 
FDT107-DIN 2903 125 Battery-powered ultrasonic flowmeter 
FDT108-DIN 3094 150 Battery-powered ultrasonic flowmeter 
FDT109-DIN 3685 200 Battery-powered ultrasonic flowmeter 
FDT101-R-DIN 2816 32 Battery-powered ultrasonic flowmeter with remote display  
FDT102-R-DIN 2868 40 Battery-powered ultrasonic flowmeter with remote display  
FDT103-R-DIN 2920 50 Battery-powered ultrasonic flowmeter with remote display  
FDT104-R-DIN 2990 65 Battery-powered ultrasonic flowmeter with remote display  
FDT105-R-DIN 3094 80 Battery-powered ultrasonic flowmeter with remote display  
FDT106-R-DIN 3181 100 Battery-powered ultrasonic flowmeter with remote display  
FDT107-R-DIN 3268 125 Battery-powered ultrasonic flowmeter with remote display  
FDT108-R-DIN 3476 150 Battery-powered ultrasonic flowmeter with remote display  
FDT109-R-DIN 4050 200 Battery-powered ultrasonic flowmeter with remote display 
Accessory
Model No. Price Description 
FDT100-BAT $35 Replacement battery for the FDT100 Series
Comes complete with operator’s manual, 3.6V battery, and NIST 3-point calibration. 
For a 4-point NIST calibration, add suffix “-NIST4” to model number and $520 to price. For an 8-point NIST calibration, add suffix “-NIST8” 
to model number and $920 to price.
Ordering Examples: FDT104-R, 2 
FDT106, 4" 150# ANSI flanged ultrasonic flowmeter with integral display, $2816. 
Recommended Reference Book: Consumer’s Guide to Magnetic Flowmeters, FW-202, $250.
1
⁄2" 150# ANSI flanged ultrasonic flowmeter with remote display, $2990. 
Visit omega.com/bobi for Additional Books
E-X

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