Page 1
DIRECT READ VARIABLE
AREA FLOW METER
FLD Series
Direct Read variable area flow
meter for Air, Water, N2, H2,
CO2, Ar, He, and O2
Rib-Guided or Fluted
Metering Tubes Facilitate
Stable, Accurate
Readings
Magnifier Lens in Front
Shields to Enhance
Reading Resolution
Interchangeability of
Flow Tubes and Floats
Ease of Installation and
Exchange of Flow Tube
Simple Means of Panel
Mounting
Designed for direct read flow rates,
the FLD Series variable area flow
meter is a precision instrument
embodying the inherent simplicity,
versatility and economy of the
classical variable area flow meter. 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.
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Many fittings of various materials and styles are
available. Visit us online.
Aluminum Frame
Air (65 mm)
Model No. Model No.
FLDA3201C FLDA3301C
FLDA3202G FLDA3302G
FLDA3203ST FLDA3303ST
FLDA3204ST FLDA3304ST
FLDA3205ST FLDA3305ST
FLDA3206ST FLDA3306ST
FLDA3207ST FLDA3307ST
FLDA3208C FLDA3308C
FLDA3209C FLDA3309C
FLDA3210G FLDA3310G
FLDA3211G FLDA3311G
FLDA3212ST FLDA3312ST
FLDA3213ST FLDA3313ST
FLDA3214G FLDA3314G
FLDA3215ST FLDA3315ST
FLDA3216ST FLDA3316ST
FLDA3217ST FLDA3317ST
FLDA3218ST FLDA3318ST
FLDA3219G FLDA3319G
FLDA3220ST FLDA3320ST
FLDA3221ST FLDA3321ST
FLDA3222G FLDA3322G
FLDA3223ST FLDA3323ST
FLDA3224C FLDA3324C
FLDA3225C FLDA3325C
FLDA3226G FLDA3326G
316 SS Frame
Air (65 mm)
Maximum
Flow
2.2 scfh
6 scfh-
10 scfh
18 scfh
25 scfh
50 scfh
90 scfh
150 scfh
0.6 scfm
1 L/min
1.15 L/min
2 L/min
4 L/min
5 L/min
10 L/min
16 L/min
25 L/min
40 L/min
7 mL/min
50 mL/min
75 mL/min
100 mL/min
130 mL/min
250 mL/min
500 mL/min
1000 mL/min
Unit
Aluminum Frame
Air (150 mm)
Model No. Model No.
FLDA3401C FLDA3501C
FLDA3402G FLDA3502G
FLDA3403G FLDA3503G
FLDA3404ST FLDA3504ST
FLDA3405ST FLDA3505ST
FLDA3406C FLDA3506C
FLDA3407G FLDA3507G
FLDA3408ST FLDA3508ST
FLDA3409ST FLDA3509ST
FLDA3410S FLDA3510S
FLDA3411ST FLDA3511ST
FLDA3412C FLDA3512C
FLDA3413ST FLDA3513ST
FLDA3414G FLDA3514G
FLDA3415G FLDA3515G
FLDA3416S FLDA3516S
FLDA3417ST FLDA3517ST
FLDA3418S FLDA3518S
FLDA3419G FLDA3519G
FLDA3420C FLDA3520C
FLDA3421ST FLDA3521ST
FLDA3422G FLDA3522G
FLDA3425S FLDA3525S
FLDA3423ST FLDA3523ST
FLDA3426S FLDA3526S
FLDA3424C FLDA3524C
FLDA3427C FLDA3527C
FLDA3428ST FLDA3528ST
FLDA3429C FLDA3529C
FLDA3430ST FLDA3530ST
FLDA3431ST FLDA3531ST
FLDA3432G FLDA3532G
FLDA3433S FLDA3533S
FLDA3434G FLDA3534G
316 SS Frame
Air (150 mm)
Maximum
Flow
2.5 scfh
5 scfh
8.25 scfh
10 scfh
16.5 scfh
23 scfh
55 scfh
90 scfh
94 scfh
1 scfm
1.5 scfm
1.25 L/min
1.8 L/min
2.5 L/min
4 L/min
4.5 L/min
4.8 L/min
5 L/min
10 L/min
10 L/min
17 L/min
23 L/min
25 mL/min
42 L/min
52 mL/min
60 L/min
75 mL/min
100 mL/min
100 mL/min
150 mL/min
200 mL/min
300 mL/min
500 mL/min
800 mL/min
Unit
B1
B1
Argon (65 mm) 316 SS Frame
Model No. Maximum Flow Units
FLDAR3301G
FLDAR3302ST
FLDAR3303ST
FLDAR3304G
FLDAR3305S
Argon (150 mm) 316 SS Frame
Model No. Maximum Flow Units
FLDAR3501C
FLDAR3502ST
FLDAR3503S
FLDAR3504C
FLDAR3505G
Ordering Examples: FLDA3212ST, 65 mm variable area flow meter, 6 turn valve, aluminum frame, 316 stainless steel float, range 2 LPM air.
FLDC3303ST, 65 mm variable area flow meter, 6 turn valve, 316 stainless steel frame, 316 stainless steel float, range 10 LPM carbon dioxide.
2.5 scfh
10 scfh
22 scfh
50 scfh
1000 mL/min
2 L/min
15 L/min
25 L/min
325 mL/min
33 mL/min
Carbon Dioxide (65 mm) Stainless Steel
Model No. Maximum Flow Units
FLDC3301G
FLDC3302G
FLDC3303ST
FLDC3304ST
FLDC3305ST
FLDC3306G
FLDC3307S
Carbon Dioxide (150 mm) Stainless Steel
Model No. Maximum Flow Units
FLDC3501G
FLDC3502ST
FLDC3503S
1 L/min
6 L/min
10 L/min
35 L/min
20 mL/min
55 mL/min
200 mL/min
100 mL/min
300 mL/min
10 L/min
B1-18
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SPECIFICATIONS
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
47
(1.85)
open
29
(1.13)
Center
Line
114 (4.50)
(65 mm size)
224 (8.813)
(150 mm size)
12.7
(0.50)
16
(0.55)
(0.375) maximum
9.5
panel thickness
16
(0.625)
16
(0.625)
To Order
Aluminum
Frame Water
(65 mm)
Model No.
FLDW3201S FLDW3301S
FLDW3202ST FLDW3302ST
FLDW3203ST FLDW3303ST
FLDW3204G FLDW3304G
FLDW3205ST FLDW3305ST
FLDW3206G FLDW3306G
FLDW3207ST FLDW3307ST
FLDW3208ST FLDW3308ST
FLDW3209ST FLDW3309ST
FLDW3210G FLDW3310G
FLDW3211G FLDW3311G
FLDW3212ST FLDW3312ST
Aluminum
Frame Water
(150 mm)
Model No. Model No.
FLDW3401C FLDW3501C
FLDW3402S FLDW3502S
FLDW3403C FLDW3503C
FLDW3404ST FLDW3504ST
FLDW3405T FLDW3505T
FLDW3406S FLDW3506S
FLDW3407S FLDW3507S
FLDW3408ST FLDW3508ST
FLDW3409G FLDW3509G
FLDW3410G FLDW3510G
FLDW3411G FLDW3511G
FLDW3412C FLDW3512C
FLDW3413ST FLDW3513ST
Ordering Examples: FLDW3401C, 150 mm variable area flow meter, 6 turn valve aluminum frame, carboloy float, range 29 GPH water.
FLDHE3504G, 150 mm variable area flow meter, 6 turn valve, 316 stainless steel frame, glass float, range 100 ml/min helium.
316 SS Frame
Water (65 mm)
Model No.
316 SS
Frame Water
(150 mm)
Maximum
Flow
1 L/min
1.2 L/min
3 L/hr
0.5 mL/min
6 mL/min
25 mL/min
60 mL/min
115 mL/min
150 mL/min
250 mL/min
500 mL/min
750 mL/min
Maximum
Flow
29 gph
0.22 gpm
0.45 gpm
1.2 L/min
2 L/min
1 mL/min
10 mL/min
20 mL/min
50 mL/min
60 mL/min
100 mL/min
200 mL/min
500 mL/min
Units
Units
Dimensions show flowmeter
side view. Face width (not
shown) is 32 mm (1.25"). Use
center line dimensions for
drilling panel.
Helium (65 mm) 316 SS Frame
Model No. Maximum Flow Units
FLDHE3301S
FLDHE3302G
Helium (150 mm) 316 SS Frame
Model No. Maximum Flow Units
FLDHE3501S
FLDHE3502C
FLDHE3503ST
FLDHE3504G
FLDHE3505C
FLDHE3506G
Hydrogen (65 mm) 316 SS Frame
Model No. Maximum Flow Units
FLDH3301C
FLDH3302G
FLDH3303G
FLDH3304ST
FLDH3305G
FLDH3306ST
FLDH3307S
FLDH3308G
Hydrogen (150 mm) 316 SS Frame
Model No.
FLDH3501S
FLDH3502G
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.
65 mL/min
120 mL/min
1.25 scfh
5 L/min
40 L/min
100 mL/min
500 mL/min
1500 mL/min
1.5 L/min
3.5 L/min
6 L/min
42 L/min
35 mL/min
100 mL/min
150 mL/min
600 mL/min
Maximum Flow Units
225 scfh
100 mL/min
B-25c
Page 4
FLDA3419G,
shown smaller
than actual size.
To Order
Nitrogen (65 mm) 316 SS Frame
Model No. Maximum Flow Units
FLDN3301ST
FLDN3302G
FLDN3303ST
FLDN3304S
FLDN3305G
FLDN3306S
Nitrogen (150 mm) 316 SS Frame
Model No. Maximum Flow Units
FLDN3501ST
FLDN3502G
FLDN3503G
FLDN3504C
FLDN3505C
FLDN3506S
Oxygen (65 mm) 316 SS Frame
Model No. Maximum Flow Units
FLDO3301G
FLDO3302ST
FLDO3303ST
FLDO3304ST
FLDO3305G
FLDO3306ST
FLDO3307ST
Oxygen (150 mm) 316 SS Frame
Model No. Maximum Flow Units
FLDO3501S
FLDO3502S
FLDO3503C
FLDO3504ST
FLDO3505C
FLDO3506ST
FLDO3507S
12 L/min
6 mL/min
50 mL/min
60 mL/min
120 mL/min
200 mL/min
1.6 scfm
2 L/min
100 mL/min
200 mL/min
300 mL/min
500 mL/min
1 L/min
4 L/min
8 L/min
15 L/min
50 mL/min
300 mL/min
500 mL/min
1 L/min
5 L/min
10 L/min
16.50 L/min
58 L/min
250 mL/min
400 mL/min
B1
Accessories
Model No. Description
FLTR-1
FLTR-2
FLTR-3
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
variable area flow meter, add suffix “-HRV” to model number for
additional cost.
NIST traceable calibration not available.
Ordering Examples: FLDN3501ST, 150 mm rvariable area flow
meter, 6 turn valve stainless steel unit, with 316SS float, range of
1.6 scfm nitrogen.
FLDO3501S, 150 mm variable area flow meter, 6 turn valve
stainless steel unit with sapphire float range of 1 LPM oxygen.
Tripod for one variable area flow meter
Tripod for two variable area flow meter
Tripod for three variable area flow meter
B-25d
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