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65 AND 150 MM VARIABLE
AREA FLOW METER
Featuring New Design with Easy Tube
Replacement and Superior Readability
Up to ±2% Full Scale Accuracy
Non-Rotating Seal Spindle
Easy-to-Read Scale Design
Special Locknut Design for Easy
Tube Replacement
The OMEGA® precision variable-area variable area flow
meter for air, water, and gases have up to ±2% of full
scale accuracy and 0.25% of full scale repeatability.
These units feature an easy-to-read millimeter scale and
are supplied with correlation charts for air and water. For
correlation data for nitrogen, oxygen, hydrogen, helium,
argon, and carbon dioxide, please consult the Engineering Department for details. The scale is fused on the
metering tube in 1 mm (³⁄32") increments, which enables a
user to read the flow rate with the highest accuracy.
The special scale design, where a vertical line runs
through the length of the scale and intersects the
horizontal scale divisions, reduces parallax and eye
fatigue, thus insuring high-accuracy readings (see inset,
next page). The front polycarbonate shield is also curved
to act as a magnifying glass, all of which yields superior
performance over other variable area flow meter with
standard design.
Easy Flow Tube Replacement
The important advantage of the FL-3600 through the
FL-3900 variable area flow meter is their special locknut
design, which facilitates the installation and replacement
of flow tubes in the field for easy flow range change. The
knurled locking nut on top of the tube is backed off with
a small Allen wrench or a 1 mm (³⁄32") diameter rod,
thereby releasing the tube for replacement. The system
is designed so that the tube does not rotate while it is
tightened into place. Only 2 different standard valves are
used: one for flows up to 7000 cc/min of air, the other
for higher flow rates. Six different high-resolution valves
are used; consult Engineering for details when changing
tubes.
Shielded for Pressurized Systems
These variable area flow meter, with precision-bored
borosilicate glass metering tubes, are fully shielded
against breakage. A white opaque rear shield provides a
background to aid in discerning the float position for
accurate readings.
Panel Mounting Design
These variable area flow meter
are equipped with horizontal
ports and NPT threads for easy
panel mounting. The ports have
external threads and are
equipped with panel retaining
nuts. No additional mounting
hardware is required. Simply
drill two holes 131 mm (5.156")
apart (center to center) for 65
mm units, 240 mm (9.469")
apart (center to center) for
150 mm units. Each hole
should be 16 mm (5⁄8") in dia.
FL-3600 Series
SPECIFICATIONS
Scales: 65 or 150 mm
arbitrary scale
Accuracy: ±2% full scale
(±5% FS on * models)
Repeatability: ±0.25% full scale
Connections: ¹⁄8 FNPT,
horizontal
Flow Tube: Borosilicate glass
End Fittings: Anodized
aluminum or 316 SS
Side Panels: Aluminum
Valve Orifice: Polyacetal for
aluminum models, Kel-F in
316 SS models
O-Rings and Packings:
Buna in aluminum models,
FKM in 316 SS models
Packings: FKM
Float Stops: PTFE
Maximum Temperature:
121°C (250°F)
Maximum Pressure: 200 psig
(13.8 bar)
Dimensions: mm (inch)
47
(1.85)
open
Dimensions show flowmeter
side view. Face width (not
shown) is 32 mm (1-1/4"). Use
center line dimensions for
drilling panel.
Optional
28.6
(1.13)
Center
Line
131
(5.156)
65 mm size
240
(9.469)
150 mm size
12.7
(0.50)
16
(5/8")
FL-3607G, shown
close to actual size.
15
(0.59) open
15
(0.59) open
9.5
(3/8) maximum
panel thickness
Drill two 15 mm (0.59'') holes
to fit inlet and outlet. Maximum
panel thickness is 9.5 mm (3/8").
Use the two retaining nuts supplied
to secure flowmeter.
B-28a
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Variable area flow meter with 65 mm Flowtubes
To Order
Model No.
Aluminum Frame
FL-3607G* FL-3707G*
FL-3607ST* FL-3707ST*
FL-3607C* FL-3707C*
FL-3635G FL-3735G
FL-3635ST FL-3735ST
FL-3613G FL-3713G
FL-3613ST FL-3713ST
FL-3610G FL-3710G
FL-3610ST FL-3710ST
FL-3610C FL-3710C
FL-3651G
††
FL-3651ST FL-3751ST
FL-3692G FL-3792G
FL-3692ST FL-3792ST
FL-3692C FL-3792C
FL-3688G FL-3788G
FL-3688ST FL-3788ST
FL-3688C FL-3788C
FL-3665G FL-3765G
FL-3665ST FL-3765ST
FL-3696ST FL-3796ST
FL-3617ST FL-3717ST
FL-3663ST FL-3763ST
FL-3663C FL-3763C
Model No.
316 SS Frame
FL-3751G
††
†
Maximum Flow Rate
(cc/min)
Air Water
5.77 0.07
16.77 0.28
32.99 0.62
48.7 0.59
145 2.38
104 1.75
298 5.78
202 2.64
522 12.0
818 20.8
1056 20.8
1946 55.6
1249 26.97
2520 70.67
3680 103.5
2040 39.7
3980 108.3
5739 169.8
2678 52.0
4922 150.0
12,058 364.0
24,680 745.0
42,094 1261.0
58,500 1866.0
B1
Polycarbonate shield acts as a
magnifier to insure high accuracy
reading with less eye fatigue.
Comes complete with correlation sheets for
air and water with instructions printed is on
the back.
“G” suffix denotes glass float,
“ST” suffix denotes 316 SS float,
“C” suffix denotes carboloy float,
“SA” denotes sapphire float.
For units without valve, add suffix “-NV” to
model number.
Minimum flow rate is 10% of the maximum
rate shown.
††
New flow rates effective for purchases
after March 1, 2013.
For 16-turn, high-resolution, non-rising stem
valve for 150 mm rvariable area flow meter,
add suffix “-HRV” to model number, for
additional cost For NIST calibration, add suffix
“-NIST AIR” to model number for additional
cost. Add suffix “-NIST WATER” to model
number for additional cost.
For oxygen cleaning add “-02CLEAN” to
model number for additional cost.
Ordering Examples: FL-3940ST, 150 mm
variable area flow meter, 16-turn,
high-resolution, non-rising stem valve stainless
steel unit, with 316 SS float, range of 41.5
LPM/air, 1.28 LPM water
FL-3802C, 150 mm variable area flow meter,
non-rising stem valve aluminum unit, with
carboloy float, range of 1222 cc/min air, 33.7
cc/min water.
Variable area flow meter with 150 mm Flowtubes
To Order
Model No.
Aluminum Frame
Model No.
316 SS Frame
FL-3841G FL-3941G
FL-3841ST FL-3941ST
FL-3861G FL-3961G
FL-3861SA FL-3961SA
FL-3861ST FL-3961ST
FL-3861C FL-3961C
FL-3802G FL-3902G
FL-3802ST
FL-3902ST
FL-3802C FL-3902C
FL-3803G FL-3903G
FL-3803ST FL-3903ST
FL-3804G FL-3904G
FL-3804ST FL-3904ST
FL-3805G FL-3905G
FL-3805ST FL-3905ST
FL-3839G FL-3939G
FL-3839ST FL-3939ST
FL-3840G FL-3940G
FL-3840ST FL-3940ST
FL-3840C FL-3940C
FL-3663C FL-3763C
†
Minimum flow rate is 10% of maximum.
* Accuracy ±5% FS on these models.
B-28b
Maximum Flow Rate
Air Water
48.5 0.53
141.5 2.45
92 0.85
140 1.92
263 4.7
454 8.5
374 5.5
814 20.4
1222 33.7
825 16.5
1682 46.0
2313 53.5
4562 130.4
3807 84.3
7590 216.6
8678 210.0
16,737 506.0
22,536 54.0
41,512 1288.0
59,494 1881.0
58,500 1866.0
†
(cc/min)
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