Omega Products FPT-6110 User Manual

HIGH ACCURACY PITOT TUBES

FPT-6000.G-11.ill

FPT-6000 Series

U Up to ±1% of Rate Accuracy
U Easy Installation–Ideal

for Retrofits

U Very Low Pressure Drop
U Low Maintenance
U For Clean, Low Viscosity

Liquids, Gases, and Steam

U Valves Included as Standard

SAE flair brass
valves included
standard with
FPT-6110 Series

The FPT-6110 is a highly accurate
averaging pitot tube which generates
a pressure differential between its
upstream (stagnation) ports and its
downstream (static) ports that is
proportional to the flowrate squared
(Q2). The differential pressure can
then be measured by a differential
pressure transducer (visit
omega.com/pressure) to provide
a 4 to 20 mA output which is
proportional to the flowrate squared.
This can then be read out as flowrate
by devices with square root extraction,
such as OMEGA’s DPF64-SQRT
meter or FC-20 mass flow computer.
The FPT-6000 can be used to
measure clean, low viscosity liquids,
gases and steam in a variety of
piping systems and pipe sizes
(to 72" and above on special order).

The FPT-6110 offers the following
advantages over orifice plates: easy,
low-cost installation (weld 1 small
coupling into place vs. 2 large
flanges); much lower permanent
pressure loss; low maintenance
(occasionally forcing gas through
the pressure ports clears the
sensing ports when dirt is a
problem); and good resistance to
wear. Bi-directional flow measurement
capability is standard. And, with
special double-mount construction,
the flow ranges listed can be
extended by to up to 4 times
(consult Flow Engineering
Department for details).

PX760 pressure transmitter,
sold separately. Visit omega.com/
pressure for more information.

SPECIFICATIONS

Accuracy: Up to 1% of rate (see

sizing). (Accuracy stated is for use in
schedule 40 pipe. If used in schedule
80 pipe, add 1% to accuracy or request
special construction)

Repeatability: ±0.1% of rate
Maximum Temperature: FPT-6100:

93°C (200°F); FPT-6200: 204°C (400°F)
“-SS” Models: 427ºC (800ºF)
Maximum Pressure:
FPT-6100: 150 psig;
FPT-6200: 1500 psig

Unrecoverable Pressure Drop
(inches H

DP = generated differential pressure
(inches H
CP = pressure loss coefficient
= 0.296 for
= 0.387 for
= 0.757 for
= 0.945 for 1"
D = inside pipe diameter (inches)

2

O): = DP x (CP/D) where:

2

O)

3

⁄8" diameter probe

1

⁄2"

3

⁄4"

FPT-6110, shown
smaller than
actual size.

Wetted Parts: FPT-6100: 316SS shaft,

brass packing and head, carbon steel
weld coupling,
FPT-6200: 316SS shaft, packing and
head, carbon steel weld coupling,

1

⁄2 FNPT Carbon Steel block valves

Dimensions
For Model FPT-6100: Add 4

line size to determine overall length
without valves. Add 7
determine clearance required to
install unit.
For Model FPT-6300: Add 8
size to determine overall length without
valves. Add 11
clearance required to install unit

1

⁄4" SAE flair brass valve;

7

⁄8" to

1

⁄2" to line size to

1

⁄4" to line

1

⁄2" to line size to determine

G-X

HIGH ACCURACY PITOT TUBES

Sizing Equations

1. Any Liquid:

Q2(GPM) x S
DP (in. H2O) =

K2 x D 4 x 32.14
1

f

2. Steam or Any Gas (steam
requires min DP of 10" H2O):

Q2(lb/hr)
DP (in. H2O) =

K2 x D

1 4

x r x 128,900

3. Any Gas:

∆P (in. H2O) =
K2 x D

Q2 (scfm) x SS x (T + 460)

4

x P x 16,590

1

Where:

∆P = differential pressure

(in in H2O)
Q = flowrate
K = flow coefficient

(see “how to order”)

D1 = inside diameter of line size

(in inches for square and
rectangular ducts use):

________

4 x height x width

D1 =

π

P = static line pressure (psia)
T = temperature (in °F)
ρ = density of medium (in pounds

Sf = Sp. Gr. at flowing conditions
Ss = Sp. Gr. at 15°C (60°F)

NOTE: Use of these equations for
liquids yields an accuracy of ±2%
of rate. When used for steam,
accuracy is ±10% of rate (when
steam tables are used). Gas
equation yields ±2% of rate
accuracy from 21 to 204°C (70 to
400°F) and 0 to 150 psig (when gas
is not near its critical point). A ±1%
of rate accuracy requires the use
of more precise equations which
account for shift in K with change
in flowrate, gas compressibility,
etc. Request a precision flow
calibration sheet and please
supply the following data: name
of fluid, specific gravity, pressure,
temperature, inside pipe diameter,
viscosity, steam quality, degrees
superheat, and ratio of specific
heat at constant pressure to that at
constant volume (for gas velocities
approaching 500 fps).

per cubic foot)

To Order

Visit omega.com/fpt6100_6200 for Pricing and Details

Model No. Nominal Differential
(Low Line Probe Pressure
Pressure) Size Dia. (inches H

FPT-6110 1"
FPT-6112 11⁄4"
FPT-6115 1
FPT-6120 2"
FPT-6125 21⁄2"
FPT-6130 3"
FPT-6135 31⁄2"
FPT-6140 4"
FPT-6160 6"
FPT-6180 8"
FPT-6181 10"
FPT-6182 12"
(High Pressure)

†

FPT-6220 2"
FPT-6225 21⁄2"
FPT-6230 3"
FPT-6235 31⁄2"
FPT-6240 4"
FPT-6260 6"
FPT-6280 8"
FPT-6281 10"
FPT-6282 12" 1" 140 6565 0.677 3.0 (6.65)
FPT-6283 14" 1" 117 7325 0.665 3.1 (6.78)
FPT-6284 16" 1" 90 8285 0.691 3.2 (6.98)
FPT-6285 18" 1" 72 9683 0.678 3.3 (7.19)
FPT-6286 20" 1" 59 11000 0.705 3.4 (7.40)
FPT-6287 24" 1" 41 13900 0.708 3.5 (7.81)
FPT-6288 36" 1" 18 21400 0.664 4.1 (9.08)

Options

Add Suffix Additional Price Description

-SS For
For
For
For 1" probe dia. and up

Comes complete with operator’s manual.

Max differential pressure shown is for up to 150°C (300°F). Above 150°C (300°F),

*

reduce value by 4% per 56°C (100°F).
† Please complete and send in questionnaire with your order, from omega.com/flowq.

For units with stainless steel construction add “-SS” to part number and adjust price based on
options available at omega.com/fpt6100_6200.

Ordering Examples: FPT-6220, high pressure model pitot tube.
FPT-6160-SS, low pressure, 3⁄8" diameter pitot tube with 316SS.

G-X

Carbon steel
block valves
included

Maximum

3

⁄8" 1200 115 0.517 0.31 (0.68)

3

1

⁄2"

3

⁄8" probe diameter

1

⁄2" probe diameter

3

⁄4" probe diameter

⁄8" 833 179 0.583 0.31 (0.69)

3

⁄8" 668 220 0.580 0.31 (0.69)

3

⁄8" 459 315 0.638 0.31 (0.70)

3

⁄8" 338 410 0.617 0.31 (0.71)

3

⁄8" 237 552 0.665 0.32 (0.72)

3

⁄8" 186 657 0.661 0.32 (0.72)

3

⁄8" 150 756 0.672 0.33 (0.73)

3

⁄8" 72 1230 0.706 0.35 (0.77)

3

⁄4" 164 3109 0.686 0.74 (1.64)

3

⁄4" 107 4006 0.676 0.80 (1.76)

3

⁄4" 77 4830 0.683 0.85 (1.88)

1

⁄2" 1064 479 0.557 1.0 (2.30)

1

⁄2" 713 609 0.598 1.1 (2.32)

1

⁄2" 510 809 0.645 1.1 (2.34)

1

⁄2" 400 963 0.630 1.1 (2.36)

1

⁄2" 328 1119 0.656 1.1 (2.37)

1

⁄2" 163 1845 0.662 1.1 (2.45)

1

⁄2" 100 2428 0.673 1.1 (2.52)

1

⁄2" 66 3139 0.682 1.2 (2.59)

316SS construction includes head,
probe, block valves and threadolet

FPT-6220,
shown smaller
than actual size.

Carbon steel

weld coupling

included

Max GPM Weight

2

O)* (Liquids) K Kg (lb)

G