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65 AND 150 mm ROTAMETERS
Dimensions show flowmeter
side view. Face width (not
shown) is 32 mm (1.25"). Use
center line dimensions for
drilling panel.
Drill two 15 mm (0.59'') holes
to fit inlet and outlet. Maximum
panel thickness is 9.5 mm (0.375").
Use the 2 retaining nuts supplied
to secure flowmeter.
47
(1.85)
open
29
(1.13)
16
(0.55)
12.7
(0.50)
(4.25)
size
65
Center
Line
9.5
(0.375) maximum
panel thickness
16
(0.625)
16
(0.625)
Featuring Standard Industrial Dimensions and Superior Readability
U Up to ±2% FS Accuracy
U Non-Rotating Seal
Spindle
U Easy-to-Read
Scale Design
U Special Dimensions for
Interchangeability
The OMEGA® precision variablearea rotameters can measure flows
of air, water, and gases, with up to
±2% FS accuracy (models ending in
“07” or “45” have ±5% FS accuracy)
and 0.25% FS repeatability. These
units feature an easy-to-read
millimeter scale and come with
correlation charts for air and water.
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 scale design, in which a vertical
line runs through the length of the
scale and intersects the horizontal
scale divisions, reduces parallax
and eye fatigue, thus ensuring
high-accuracy readings (see inset,
next page). The front polycarbonate
resin shield is also curved to act as
a magnifying glass, which yields
superior performance over other
rotameters with standard designs
Non-Rising Stem Needle Valve
The 150 mm size flowmeters are
also available with a non-rising
stem type needle valve for special
applications. This 15-turn metering
valve has superior flow-rate control,
and is particularly suited to use in
chromatography applications. The
sliding tapered-needle mechanism
virtually eliminates sticking or
buildup due to foreign matter in the
fluid stream, without variations or
saw-toothing of the flow rate.
FL-3207G
Optional
shown larger
than actual size.
Shielded for Pressurized Systems
These rotameters, with precisionbored borosilicate glass metering
tubes, are fully shielded against
breakage. A white opaque rear
shield provides a background to aid
in discerning the float position.
Panel Mounting Design
These rotameters 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 2 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 diameter.
SPECIFICATIONS
Scales: 65 or 150 mm
arbitrary scale
Accuracy: ±2% FS (*±5% FS)
Repeatability: ±
Connections:
Flow Tube: Borosilicate glass
End Fittings: Anodized aluminum
or 316 SS
Side Panels: Aluminum
Valve Orifice: Polyacetal for
aluminum models, PCTFE
316 SS models
O-Rings: Buna in aluminum
models, FKM in 316 SS models
Packings: FKM
Float Stops: PTFE
Maximum Temperature:
250°F (180°F for water)
Maximum Pressure: 200 psig
Valve Orifice: Polyacetal for
aluminum units, PCTFE for 316 SS
1
⁄4% FS
1
⁄8 FNPT, horizontal
for
B-21
FL-3207G
Panel-Mount Installation
Dimensions: mm (inch)
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Rotameters with 65 mm Flow Tubes
To Order Visit omega.com/fl3200_fl3500 for Pricing and Details
Model No. Model No.
Aluminum Frame 316 SS Frame
Air Water
FL-3207G* FL-3307G* 5.77 0.07
FL-3207ST* FL-3307ST* 16.77 0.28
FL-3207C* FL-3307C* 32.99 0.62
FL-3235G FL-3335G 48.7 0.59
FL-3235ST FL-3335ST 214.5 2.38
FL-3207G
shown larger
than actual size.
FL-3213G FL-3313G 104 1.75
FL-3213ST FL-3313ST 298 5.78
FL-3210G FL-3310G 202 2.64
FL-3210ST FL-3310ST 522 12.0
FL-3210C FL-3310C 818 20.8
FL-3251G FL-3351G 986 20.5
FL-3251ST FL-3351ST 1946 55.6
FL-3292G FL-3392G 1249 26.97
FL-3292ST FL-3392ST 2520 70.67
FL-3292C FL-3392C 3680 03.5
FL-3288G FL-3388G 2040 39.7
FL-3288ST FL-3388ST 3980 108.3
FL-3288C FL-3388C 5739 169.8
FL-3265G FL-3365G 2678 52.0
FL-3265ST FL-3365ST 4922 150.0
FL-3296ST FL-3396ST 12,058 364.0
FL-3217ST FL-3317ST 24,680 745.0
FL-3263ST FL-3363ST 42,094 1261.0
FL-3263C FL-3363C 58,500 1866.0
Rotameters with 150 mm Flow Tubes
Model No. Model No.
Aluminum Frame 316 SS Frame
1
Max
FL-3445G* FL-3545G* 18.6 0.196
FL-3445ST* FL-3545ST* 61.8 0.956
FL-3445C* FL-3545C* 110 1.92
FL-3441G FL-3541G 48.5 0.53
FL-3441ST FL-3541ST 141.5 2.45
Polycarbonate
resin shield acts
as a magnifier
to ensure high
accuracy with
less eye fatigue.
FL-3461G FL-3561G 92 0.85
FL-3461SA FL-3561SA 140 1.92
FL-3461ST FL-3561ST 263 4.7
FL-3461C FL-3561C 454 8.5
FL-3402G FL-3502G 374 5.5
FL-3402ST FL-3502ST 814 20.4
FL-3402C FL-3502C 1222 33.7
FL-3403G FL-3503G 825 16.5
FL-3403ST FL-3503ST 1682 46.0
FL-3404G FL-3504G 2313 53.5
FL-3404ST FL-3504ST 4562 130.4
FL-3405G FL-3505G 3807 84.3
FL-3405ST FL-3505ST 7590 216.6
FL-3439G FL-3539G 8678 210.0
FL-3439ST FL-3539ST 16,737 506.0
FL-3440G FL-3540G 22,536 54.0
FL-3440ST FL-3540ST 41,512 1288.0
FL-3440C FL-3540C 59,494 1881.0
Comes complete with correlation tables (one each for air and water) on the back of the instruction sheet.
G suffix denotes glass float, ST suffix denotes 316 SS float, C suffix denotes carboloy float, SA suffix denotes sapphire float.
For units without valve, add suffix “-NV” to model number.
1
For 16 turn, high-resolution non-rising stem valve for 150 mm rotameters, add suffix “-HRV” to model number, for
additional cost.
†
Minimum flow rate is 10% of maximum.
Accuracy ±5% on these models.
*
For NIST traceable certificate for air, add suffix “-NISTAIR” to model number, for additional cost. For water, add suffix
“-NISTWATER” to model number, for additional cost.
Ordering Examples: FL-3403ST, 150 mm flowtube in aluminum frame.
FL-34406-NV, 150 mm flowtube in aluminum frame, no valve.
FL3502G-HRV, 150 mm flowtube in 316 SS frame with high resolution valve.
B-22
Max Flow Rate† (cc/min)
Flow Rate† (cc/min)
Air Water
B