Direct reaD rotameters
FLD Series
U Direct Read Rotameters
for Air, Water, N2, H2,
CO2, Ar, He, and O
U Rib-Guided or Fluted
Metering Tubes Facilitate
Stable, Accurate
Readings
U Magnifier Lens in Front
Shields to Enhance
Reading Resolution
U Interchangeability of
Flow Tubes and Floats
U Ease of Installation and
Exchange of Flow Tube
U Simple Means of Panel
Mounting
2
Designed for direct read flow rates,
the FLD Series rotameter is a
precision instrument embodying the
inherent simplicity, versatility and
economy of the classical rotameter.
It is particularly suitable for metering
carrier gases in chromatography,
indicating and controlling gases in
manufacturing processes, liquid and
gas measurement in laboratories,
pilot plants, flow and level indicating,
etc. Shipped completely
assembled, flow meters include
standard mounting fittings in a
choice of materials, side plates,
thick protective magnifying front
shield and back plate, built-in control
valve, and flow tubes. Panel
FLDA3220ST, shown
smaller than actual size.
mounting style is convertible to
bench mounting through the use of
the optional acrylic tripod, FLTR-1.
The tripod has a built-in spirit leveler
and leveling screws.
Meters come with built-in 6 turn
needle valves, high precision
metering valves with “non-rising
stems” 16 turn, or with no valves.
The higher cost of the high
resolution valves is justified
whenever high sensitivity control
and resolution are desirable—
particularly in conjunction with metering tubes of very low flow rates.
Generally, for gas metering it is
recommended that valves are
B-25a
FLDA3419G,
shown smaller
than actual size.
positioned at inlets (bottom) for
liquids valves may be positioned
either at inlets or outlets (top).
For vacuum services, valves
must be mounted at outlets. If
unspecified at the time of ordering,
meters will be shipped with valves
mounted at the inlets.
Many fittings of various materials and styles are
available. Visit omega.com
To Order Visit omega.com/fld for Pricing and Details
Aluminum Frame 316 SS Frame
Air (65 mm) Air (65) mm Maximum
Model No. Model No. Flow Units
FLDA3201C FLDA3301C 2.2 scfh
FLDA3202G FLDA3302G 6 scfh FLDA3203ST FLDA3303ST 10 scfh
FLDA3204ST FLDA3304ST 18 scfh
FLDA3205ST FLDA3305ST 25 scfh
FLDA3206ST FLDA3306ST 50 scfh
FLDA3207ST FLDA3307ST 90 scfh
FLDA3208C FLDA3308C 150 scfh
FLDA3209C FLDA3309C 0.6 scfm
FLDA3210G FLDA3310G 1 L/min
FLDA3211G FLDA3311G 1.15 L/min
FLDA3212ST FLDA3312ST 2 L/min
FLDA3213ST FLDA3313ST 4 L/min
FLDA3214G FLDA3314G 5 L/min
FLDA3215ST FLDA3315ST 10 L/min
FLDA3216ST FLDA3316ST 16 L/min
FLDA3217ST FLDA3317ST 25 L/min
FLDA3218ST FLDA3318ST 40 L/min
FLDA3219G FLDA3319G 7 mL/min
FLDA3220ST FLDA3320ST 50 mL/min
FLDA3221ST FLDA3321ST 75 mL/min
FLDA3222G FLDA3322G 100 mL/min
FLDA3223ST FLDA3323ST 130 mL/min
FLDA3224C FLDA3324C 250 mL/min
FLDA3225C FLDA3325C 500 mL/min
FLDA3226G FLDA3326G 1000 mL/min
Aluminum Frame 316 SS Frame
Air (150 mm) Air (150 mm) Maximum
Model No. Model No. Flow Unit
FLDA3401C FLDA3501C 2.5 scfh
FLDA3402G FLDA3502G 5 scfh
FLDA3403G FLDA3503G 8.25 scfh
FLDA3404ST FLDA3504ST 10 scfh
FLDA3405ST FLDA3505ST 16.5 scfh
FLDA3406C FLDA3506C 23 scfh
FLDA3407G FLDA3507G 55 scfh
FLDA3408ST FLDA3508ST 90 scfh
FLDA3409ST FLDA3509ST 94 scfh
FLDA3410S FLDA3510S 1 scfm
FLDA3411ST FLDA3511ST 1.5 scfm
FLDA3412C FLDA3512C 1.3 L/min
FLDA3413ST FLDA3513ST 1.8 L/min
FLDA3414G FLDA3514G 2.5 L/min
FLDA3415G FLDA3515G 4 L/min
FLDA3416S FLDA3516S 4.5 L/min
FLDA3417ST FLDA3517ST 4.8 L/min
FLDA3418S FLDA3518S 5 L/min
FLDA3419G FLDA3519G 10 L/min
FLDA3420C FLDA3520C 10 L/min
FLDA3421ST FLDA3521ST 17 L/min
FLDA3422G FLDA3522G 23 L/min
FLDA3425S FLDA3525S 25 mL/min
FLDA3423ST FLDA3523ST 42 mL/min
FLDA3426S FLDA3526S 52 mL/min
FLDA3424C FLDA3524C 60 mL/min
FLDA3427C FLDA3527C 75 mL/min
FLDA3428ST FLDA3528ST 100 mL/min
FLDA3429C FLDA3529C 100 mL/min
FLDA3430ST FLDA3530ST 150 mL/min
FLDA3431ST FLDA3531ST 200 mL/min
FLDA3432G FLDA3532G 300 mL/min
FLDA3433S FLDA3533S 500 mL/min
FLDA3434G FLDA3534G 800 mL/min
B1
Argon (65 mm) 316 SS Frame
Model No.
FLDAR3301G 2.5 scfh
FLDAR3302ST 10 scfh
FLDAR3303ST 22 scfh
FLDAR3304G 50 scfh
FLDAR3305S 1000 mL/min
Argon (150 mm) 316 SS Frame
Model No.
FLDAR3501C 2 L/min
FLDAR3502ST 15 L/min
FLDAR3503S 25 L/min
FLDAR3504C 325 mL/min
FLDAR3505G 33 mL/min
Ordering Examples: FLDA3212ST, 65 mm rotameter, 6 turn valve, aluminum frame, 316 stainless steel float, range 2 LPM air.
FLDC3303ST, 65 mm rotameter, 6 turn valve, 316 stainless steel frame, 316 stainless steel float, range 10 LPM carbon dioxide.
Maximum
Maximum
Flow Units
Flow Units
Carbon Dioxide (65 mm) Stainless Steel
Model No.
FLDC3301G 1 L/min
FLDC3302G 6 L/min
FLDC3303ST 10 L/min
FLDC3304ST 35 L/min
FLDC3305ST 20 mL/min
FLDC3306G 55 mL/min
FLDC3307S 200 mL/min
Carbon Dioxide (150 mm) Stainless Steel
Model No.
FLDC3501G 100 mL/min
FLDC3502ST 300 mL/min
FLDC3503S 10 L/min
Maximum
Maximum
Flow Units
Flow Units
B-25b
SPECIFICATIONS
o 15.88 mm (0.625'') holes
uts supplied
41.40
(1.63)
open
28.6
(1.13)
13.49
(0.53)
12.7
(0.50)
150
(8.93)
65
(4.50)
Center
Line
9.5 (3/8) maximum
panel thickness
16
(5/8)
16
(5/8)
Standard Accuracy: ±5% of full scale (FS)
Repeatability: ±0.25%
Useful Flow Range: 10:1 minimum
Maximum Operating Pressure: 200 psig/13.8 bars
Maximum Operating Temperature: 121°C (250°F)
Construction
Flow Tubes: Heavy walled borosilicate glass
Floats: Glass, red sapphire, 316 stainless steel,
carboloy and tantalum
Choice of Mounting Fittings in Contact with Fluids:
Aluminum, black anodized or 316 stainless steel
Side Panels: Aluminum, black anodized
Front Shield: Polycarbonate resin with longitudinal
magnifier lens for enhanced reading resolution
Back Plate:
O-Rings and Packing: Buna O-rings in aluminum/brass
model. FKM O-rings in stainless steel meters
Optional: Perfluoroelastomer and EPR
Connections:
1
⁄8" thick white acrylics
1
⁄8 NPT female inlet and outlet connections
Dimensions: mm (inch)
Panel Mount Installation
Center
(4.50)
41.40
(1.63)
open
28.6
(1.13)
Line
65
150
(8.93)
12.7
(0.50)
13.49
(0.53)
9.5 (3/8) maximum
panel thickness
16
(5/8)
(5/8)
16
Dimensions show rotameter
Dimensions show rotameter
side view. Face width (not
side view. Face width (not
shown) is 32 mm (1.25"). Use
shown) is 32 mm (1.25"). Use
center line dimensions for
center line dimensions for
drilling panel.
drilling panel.
To Order Visit omega.com/fld for Pricing and Details
Aluminum Frame 316 SS Frame
Water (65 mm) Water (65 mm) Maximum
Model No. Model No. Flow Units
FLDW3201S FLDW3301S 1 L/min
FLDW3202ST FLDW3302ST 1.2 L/min
FLDW3203ST FLDW3303ST 3 L/hr
FLDW3204G FLDW3304G 0.5 mL/min
FLDW3205ST FLDW3305ST 6 mL/min
FLDW3206G FLDW3306G 25 mL/min
FLDW3207ST FLDW3307ST 60 mL/min
FLDW3208ST FLDW3308ST 115 mL/min
FLDW3209ST FLDW3309ST 150 mL/min
FLDW3210G FLDW3310G 250 mL/min
FLDW3211G FLDW3311G 500 mL/min
FLDW3212ST FLDW3312ST 750 mL/min
Aluminum Frame 316 SS Frame
Water (150 mm) Water (150 mm)
Maximum
Model No. Model No. Flow Units
FLDW3401C FLDW3501C 29 gph
FLDW3402S FLDW3502S 0.22 gpm
FLDW3403C FLDW3503C 0.45 gpm
FLDW3404ST FLDW3504ST 1.2 L/min
FLDW3405T FLDW3505T 2 L/min
FLDW3406S FLDW3506S 1 mL/min
FLDW3407S FLDW3507S 10 mL/min
FLDW3408ST FLDW3508ST 20 mL/min
FLDW3409G FLDW3509G 50 mL/min
FLDW3410G FLDW3510G 60 mL/min
FLDW3411G FLDW3511G 100 mL/min
FLDW3412C FLDW3512C 200 mL/min
FLDW3413ST FLDW3513ST 500 mL/min
Ordering Examples: FLDW3401C, 150 mm rotameter, 6 turn valve aluminum frame, carboloy float, range 29 GPH water.
FLDHE3504G, 150 mm rotameter, 6 turn valve, 316 stainless steel frame, glass float, range 100 ml/min helium.
Helium (65 mm) 316 SS Frame
Model No.
Maximum
FLDHE3301S 65 mL/min
FLDHE3302G 120 mL/min
Helium (150 mm) 316 SS Fram
Model No.
Maximum
FLDHE3501S 1.25 scfh
FLDHE3502C 5 L/min
FLDHE3503ST 40 L/min
FLDHE3504G 100 mL/min
FLDHE3505C 500 mL/min
FLDHE3506G 1500 mL/min
Hydrogen (65 mm) 316 SS Frame
Model No.
Maximum
FLDH3301C 1.5 L/min
FLDH3302G 3.5 L/min
FLDH3303G 6 L/min
FLDH3304ST 42 L/min
FLDH3305G 35 mL/min
FLDH3306ST 100 mL/min
FLDH3307S 150 mL/min
FLDH3308G 600 mL/min
Hydrogen (150 mm) 316 SS Frame
Model No.
Maximum
FLDH3501S 225 scfh
FLDH3502G 100 mL/min
B-25c
Drill tw
Drill two 15.88 mm (0.625'') holes
to fit inlet and outlet. Maximum
to fit inlet and outlet. Maximum
panel thickness is 9.5 mm (3/8").
panel thickness is 9.5 mm (3/8").
Use the two retaining n
Use the two retaining nuts supplied
to secure rotameter.
to secure rotameter.
Flow Units
Flow Units
Flow Units
Flow Units
FLDA3419G,
shown smaller
than actual size.
To Order
Nitrogen (65 mm) 316 SS Frame
Model No.
FLDN3301ST 12 L/min
FLDN3302G 6 mL/min
FLDN3303ST 50 mL/min
FLDN3304S 60 mL/min
FLDN3305G 120 mL/min
FLDN3306S 200 mL/min
Nitrogen (150 mm) 316 SS Frame
Model No.
FLDN3501ST 1.6 scfm
FLDN3502G 2 L/min
FLDN3503G 100 mL/min
FLDN3504C 200 mL/min
FLDN3505C 300 mL/min
FLDN3506S 500 mL/min
Oxygen (65 mm) 316 SS Frame
Model No.
FLDO3301G 1 L/min
FLDO3302ST 4 L/min
FLDO3303ST 8 L/min
FLDO3304ST 15 L/min
FLDO3305G 50 mL/min
FLDO3306ST 300 mL/min
FLDO3307ST 500 mL/min
Oxygen (150 mm) 316 SS Frame
Model No.
FLDO3501S 1 L/min
FLDO3502S 5 L/min
FLDO3503C 10 L/min
FLDO3504ST 16.50 L/min
FLDO3505C 58 L/min
FLDO3506ST 250 mL/min
FLDO3507S 400 mL/min
Visit omega.com/fld for Pricing and Details
Maximum
Maximum
Maximum
Maximum
Flow Units
Flow Units
Flow Units
Flow Units
B1
Accessories
Model No. Description
FLTR-1 Tripod for one rotameter
FLTR-2 Tripod for two rotameters
FLTR-3 Tripod for three rotameters
Comes complete with operator’s manual.
“G” suffix denotes glass float, “ST” suffix denotes 316SS float, “C”
suffix denotes carboloy float and “SA” denotes red sapphire float.
For units without valve, add suffix “-NV” to model number and
subtract cost for aluminum; subtract cost for for 316SS.
For oxygen cleaning add “-02CLEAN” to model number for
additional cost.
Note: Minimum flow rate is 10% of the maximum rate shown.
For 16 turn, high resolution non-rising stem valve for 150 mm
rotameters, add suffix “-HRV” to model number for additional cost.
NIST traceable calibration not available.
Ordering Examples: FLDN3501ST, 150 mm rotameter,
6 turn valve stainless steel unit, with 316SS float, range of
1.6 scfm nitrogen.
FLDO3501S, 150 mm rotameter, 6 turn valve stainless steel unit
with sapphire float range of 1 LPM oxygen.
B-25d
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