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OEM-STYLE ACRYLIC VARIABLE
AREA FLOW METER
Capacities: Water: 6.5 GPH to 20 GPM
Air: 2 SCFH to 40 SCFM
FL4000 Series
Optional
50, 75, 127, and 250 mm
(1.97, 2.96, 5, and 9.85")
Scale Lengths
Floats are Rod-Guided
in Most Models
Metering Valves Available
Rear Inserts Provided
for Panel Mounting
Direct-Reading Scales
FL4000 OEM-style variable area
flow meter are precisely machined
from solid acrylic blocks. They are
available in 50, 75, 127, and 250
mm (1.97, 2.96, 5, and 9.85") scale
lengths and have accuracies
between 2 and 6%. Designed for
front-panel mounting, the rear ports
extend through the panel for easy
hookup. Mounting threads are also
provided. Units are available with
and without valves.
FL4212-V, with
optional valve,
shown actual size.
FL4304, shown
actual size.
SPECIFICATIONS
Construction: Acrylic tube, 316 SS float
and guide rod (no guide rod for FL4211
through FL4215 air meters), PVC end
fittings (brass on FL4200 Series),
EPR O-rings, optional brass valve
Max Pressure/Temperature:
Water Ranges:
125 psig @ 21°C (70°F);
54°C (130°F) at 0 psig
Air Ranges:
100 psig @ 21°C (70°F);
38°C (100°F) @ 0 psig
Full Scale Accuracy/Repeatability:
FL4200: 6/2%
FL4300 and FL4400: 4/1%
FL4500: 3/1⁄2%
FL4600: 2/1⁄2%
FL4503-V,
shown actual size.
B-17a
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L
H
J
Dimensional
Drawing
Many fittings of various materials
c
J
and styles are available.
Visit us online
D
F
(FULL OPEN)
B
3.5
3.0
2.5
H
F
2.0
1.5
1.0
.5
C
REAR VIEW
GPM-LIQUID-Sp. Gr. 1.0-READ TOP OF FLOAT
A
D
(FULL OPEN)
Connection: FL4200: ¹⁄4 FNPT; FL4300
and FL-4500: ¹⁄4 FNPT x ¹⁄2 MNPT; FL4400:
1 MNPT; FL4600: ¹⁄2 FNPT
G
E
G
E
L
J
Dimensions
mm (inch)
A
B
C
D
E
F
G
H
L
J Mounting
FL4200
102 (4.0) 168 (6.6) 225 (8.9) 210 (8
25 (1.0) 32 (1.3) 44 (1.8) 32 (1
32 (1.3) 35 (1.4) 46 (1.9) 35 (1
105 (4.1) 173 (6.8) 232 (9.9) 213 (8
FL4300
FL4400
FL4500
1
⁄4) 362 (141⁄4)
1
⁄4) 44 (13⁄4)
3
⁄8) 46 (113⁄16)
3
⁄8) 368 (141⁄2)
FL4600
13 (0.5) 25 (1.0) 32 (1.3) 25 (1) 19 (
29 (1.1) 32 (1.3) 48 (1.9) 32 (1
76 (3.0) 127 (5.0) 165 (6.5) 164 (6
— 76 (3.0) 102 (4.0) 100 (3
1
⁄4) 48 (17⁄8)
7
⁄16) 311 (121⁄4)
15
⁄16) 222 (83⁄4)
17 (0.7) 25 (1.0) 35 (1.4) 25 (1) 32 (1
†
1
⁄4 x 20
1
⁄4 x 20
1
⁄4 x 20
3
⁄8 x 24
3
Thread Size*
Threaded stud.
*
†
FL4200 has 7⁄8" hex lock nuts around ports; requires 3⁄4" holes to be drilled through the panel.
To Order
Water Air
Model No.
FL4201
FL4202
FL4203
FL4204
FL4205
FL4301
FL4302
FL4303
FL4304
FL4401
FL4402
FL4403
FL4501
FL4502
FL4503
FL4504
FL4601
FL4602
FL4603
FL4604
Comes complete with operator’s manual.
Minimum flow rate = 10% of maximum flow rate listed.
*
For water ranges. For air ranges, contact the Flow Department. For units with brass valve,
**
add suffix “-V” to model number, additional cost for FL4200s, FL4300s, FL4400s, FL4500s
and FL4600s.
For NIST calibration certificate, and “-NIST 5PT” to the model number for 5-point calibration,
or “-NIST 10PT” for 10-point calibration for additional cost.
Ordering Examples: FL4303-V, acrylic variable area flow meter, 3.5 GPM flow rate.
FL-4613, acrylic variable area flow meter, 40 SCFM max flow.
Range
(Maximum)*
7 GPH 1** 1.3**
12 GPH 15** 17**
22 GPH 35** 51**
44 GPH 149** 200**
60 GPH 100** 250**
1 GPM 18** 26**
2.0 GPM 70** 125**
3.5 GPM 200** 290**
5 GPM 290** 440**
10 GPM 53 220
15 GPM 132 330
20 GPM 200 400
1 GPM 18 33
100 GPH 45 75
2 GPM 70 155
5 GPM 240 400
2 GPM 5 21
3.5 GPM 13 50
5 GPM 20 95
10 GPM 110 270
B-17b
Pressure Drop, inH2O**
No Valve Valve
Model No.
FL4211
FL4212
FL4213
FL4214
FL4215
FL4216
FL4217
FL4218
FL4219
FL4411
FL4412
—
FL4511
FL4512
FL4513
FL4514
FL4611
FL4612
FL4613
FL4614
Range
(Maximum)*
2.6 SCFH
5.0 SCFH
10.0 SCFH
20.0 SCFH
30.0 SCFH
60.0 SCFH
100.0 SCFH
180.0 SCFH
4.0 SCFM
40.0 SCFM
62.0 SCFM
—
4.0 SCFM
6.8 SCFM
8.0 SCFM
20.0 SCFM
8.5 SCFM
14.5 SCFM
20.0 SCFM
40.0 SCFM
B1
⁄4)
1
⁄4)
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