Series VF Visi-Float® Acrylic Flowmeter

Hot-Stamped Scales, Multi-Angle Views of Flow

The SERIES VF Visi-Float® Flowmeters are a line of direct reading, precision machined, clear acrylic body flowmeters suitable for both gas and liquid applications. The fabrication of the Visi-Float® flowmeters is backed by over 60 years of experience in acrylic instrument machining. This Series consists of 2" (51 mm) and 4" (102 mm) scales with optional precision metering valves.

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Product Applications

  • Medical equipment
  • Laboratory equipment
  • Air samplers
  • Gas analyzers
  • Pollution monitors
  • Chemical injectors
  • Cabinet purging

Models & Ordering

Filter By

Build Your Custom Part. Use our Product Configurator

Model Description Usually Ships Price Order
VFA-1
Ships: Same Day
Price: $29.50
Flowmeter, range .1-1 SCFH air. Same Day $29.50 Order
VFA-2
Ships: Same Day
Price: $29.50
Flowmeter, range .2-2 SCFH air. Same Day $29.50 Order
VFA-21
Ships: Same Day
Price: $29.50
Flowmeter, range .06-0.5 LPM air. Same Day $29.50 Order
VFA-22
Ships: Same Day
Price: $29.50
Flowmeter, range .15-1 LPM air. Same Day $29.50 Order
VFA-23
Ships: Same Day
Price: $29.50
Flowmeter, range .6-5 LPM air. Same Day $29.50 Order
VFA-24
Ships: Same Day
Price: $29.50
Flowmeter, range 1-10 LPM air. Same Day $29.50 Order
VFA-25
Ships: Same Day
Price: $29.50
Flowmeter, range 3-25 LPM air. Same Day $29.50 Order
VFA-26
Ships: Same Day
Price: $29.50
Flowmeter, range 6-50 LPM air. Same Day $29.50 Order
VFA-27
Ships: Same Day
Price: $29.50
Flowmeter, range 10-100 LPM air. Same Day $29.50 Order
VFA-3
Ships: Same Day
Price: $29.50
Flowmeter, range .6-5 SCFH air. Same Day $29.50 Order
VFA-32
Ships: 1-2 Weeks
Price: $29.50
Flowmeter, range 6-50 cc/min water. 1-2 Weeks $29.50 Order
VFA-33
Ships: Same Day
Price: $29.50
Flowmeter, range 10-100 cc/min water. Same Day $29.50 Order
VFA-34
Ships: Same Day
Price: $29.50
Flowmeter, range 20-200 cc/min water. Same Day $29.50 Order
VFA-4
Ships: Same Day
Price: $29.50
Flowmeter, range 1-10 SCFH air. Same Day $29.50 Order
VFA-41
Ships: Same Day
Price: $29.50
Flowmeter, range .6-5 GPH water. Same Day $29.50 Order
VFA-42
Ships: Same Day
Price: $29.50
Flowmeter, range 2-10 GPH water. Same Day $29.50 Order
VFA-43
Ships: Same Day
Price: $29.50
Flowmeter, range 3-20 GPH water. Same Day $29.50 Order
VFA-44
Ships: Same Day
Price: $29.50
Flowmeter, range 8-40 GPH water. Same Day $29.50 Order
VFA-5
Ships: Same Day
Price: $29.50
Flowmeter, range 2-20 SCFH air. Same Day $29.50 Order
VFA-6
Ships: Same Day
Price: $29.50
Flowmeter, range 4-30 SCFH air. Same Day $29.50 Order
VFA-7
Ships: Same Day
Price: $29.50
Flowmeter, range 5-50 SCFH air. Same Day $29.50 Order
VFA-8
Ships: Same Day
Price: $29.50
Flowmeter, range 10-100 SCFH air. Same Day $29.50 Order
VFA-9
Ships: Same Day
Price: $29.50
Flowmeter, range 20-200 SCFH air. Same Day $29.50 Order

Can't find what you need? Build Your Custom Part. Use our Product Configurator

Specifications

Service:
Compatible gases and liquids.
Wetted Materials:
Body: acrylic plastic; O-ring: Buna-N (fluoroelastomer available); Metal parts: brass standard, stainless steel optional; Float: stainless steel, black glass, aluminum, K monel depending on range.
Temperature & Pressure Limits:
Without Valve: 100 psig (6.9 bar) @ 150°F (65°C); 150 psig (10 bar) @ 100°F (38°C); With Valve: 100 psig (6.9 bar) @ 120°F (48°C).
Accuracy:
VFA = 5% of FS; VFB = 3% of FS.
Process Connection:
1/8" female NPT. VFB ranges 85 and 86 have 1/4" NPT back connections or 3/8" NPT end connections. These ranges not available with brass valves.
Scale Length:
VFA 2" typical length; VFB 4" typical length.
Mounting Orientation:
Mount in vertical position.
Weight:
VFA: 4.0 to 4.8 oz (.11 to .14 kg); VFB: 7.2 to 8.8 oz (.20 to .25 kg).
Agency Approvals:
Meets the technical requirements of EU Directive 2011/65/EU (RoHS II).

Features

  • Bodies are cut and precision machined from solid, clear acrylic blocks allowing for complete visual inspection
  • White background allows for better visibility of the float increasing reading accuracy
  • Direct reading scales are hot stamped into the plastic eliminating the need for troublesome conversions and increasing product operating life
  • Precision machined tapered bore enables high repeatability
  • Low installation costs with back or end connection options with metal mounting inserts that can be supported directly by system piping

Options

  • Special Multi-Column Visi-Float Flowmeters - Perfect for OEM applications, Visi-Float® flowmeters can be custom made with up to 10 columns in a single block of acrylic plastic. Available with or without valves. Consult factory for more information.
  • OEM Specials - Special flowmeter designs can be supplied to meet a wide range of requirements and specific applications. These include: on-off plunger and push-to-test valves, special gas or fluid calibration, special ranges, scales, name brand or other identification. Pointer flags can be furnished for instant visual reference. For specific information, please supply an outline of your requirements.
  • -PF Red ABS Plastic Pointer Flag.
  • -VIT Fluoroelastomer O-rings.
  • -RKA/RK-VFB Pressure Regulator.

Accessories

Model Number Description Usually Ships Price Order
Regulator kit for RMA or VFA. RKA Regulator kit for RMA or VFA. Same Day $217.00 Order
Regulator kit for VFB. RK-VFB Regulator kit for VFB. Same Day $217.00 Order

Videos

Model Chart

Series VFA - 2" Scale

EXAMPLE VFA 1 AT Series VFA-1-AT Visi-Float® Flowmeter, 2" scale, range .1-1 SCFH air, with aluminum tag.
SERIES VFA     Visi-Float® Flowmeter, 2" Scale
RANGE   1
2
3
4
5
6
7
8
9
21
22
23
24
25
26
27
32
33
34
41
42
43
44
  .1-1 SCFH Air
.2-2 SCFH Air
.6-5 SCFH Air
1-10 SCFH Air
2-20 SCFH Air
4-30 SCFH Air
5-50 SCFH Air
10-100 SCFH Air
20-200 SCFH Air
.06-0.5 LPM Air
.15-1 LPM Air
.6-5 LPM Air
1-10 LPM Air
3-25 LPM Air
6-50 LPM Air
10-100 LPM Air
6-50 cc/min Water
10-100 cc/min Water
20-200 cc/min Water
.6-5 GPH Water
2-10 GPH Water
3-20 GPH Water
8-40 GPH Water
OPTIONS     ARB
AT
BV
EC
NIST
PF
SPCL
SS
SSV
VIT
WL
Arbitrary Scale
Aluminum Tag
Brass Valve*
End Connections
NIST Traceable Calibration Certificate
Pointer Flag
Special Cleaning
Stainless Steel Wetted parts
Stainless Steel Valve*
Fluoroelastomer O-rings
Without Logo


Series VFB - 4" Scale

EXAMPLE VFB 50 AT Series VFB-50-AT Visi-Float® Flowmeter, 4" scale, range .3-3 SCFH air, with aluminum tag.
SERIES VFB     Visi-Float® Flowmeter, 4" Scale
RANGE   50
51
52
53
54
55
60
65
66
67
68
69
80
81
82
83
84
85
86
90
91
51D
53D
54D
55D
80D
83D
91D
92D
93D
94D
  .3-3 SCFH Air
2-20 SCFH Air
4-40 SCFH Air
10-100 SCFH Air
15-150 SCFH Air
20-200 SCFH Air
100-1000 cc/min Air
.2-4 LPM Air
1-10 LPM Air
1-20 LPM Air
3-30 LPM Air
4-40 LPM Air
.5-12 GPH Water
6-60 GPH Water
2-30 cc/min Water
1-20 GPH Water
6-40 GPH Water
.2-2 GPM Water
.6-5 GPM Water
.3-3 SCFM Air
1-10 SCFH Air
2-20 SCFH & 0.5-9.5 LPM Air
10-100 SCFH & 6-48 LPM Air
15-150 SCFH & 5-70 LPM Air
40-200 SCFH & 20-95 LPM Air
0.5-12 GPH & 0.04-0.74 LPM Water
1-20 GPH & 0.1-1.3 LPM Water
1-10 SCFH & 0.6-4.8 LPM Air
0.6-5 SCFH & 0.3-2.5 LPM Air
6-50 SCFH & 3-23 LPM Air
10-100 GPH & 0.5-6.5 LPM Water
OPTIONS     ARB
AT
BV
EC
NIST
PF
SPCL
SS
SSV
VIT
WL

Arbitrary Scale
Aluminum Tag
Brass Valve*
End Connections
NIST Traceable Calibration Certificate
Pointer Flag
Special Cleaning
Stainless Steel Wetted parts
Stainless Steel Valve*
Fluoroelastomer O-rings
Without Logo

*Valve is designed for flow adjustment only, not intended to be used as an open/shut-off valve.

Product Literature

Manuals

Catalog Pages

Product Data Sheet

Approvals

Drawings

Questions

Question
How are Dwyer flowmeters properly read?
Answer
The flow rate is read at the maximum width portion of the float regardless of shape.
Question
I am looking to use an "Air" flowmeter RMA-6-SSV to monitor CO2 flow. I am wondering if there are are any concerns or correction factors I need to apply.
Answer
A specific gravity correction factor will need to be considered when monitoring other gases with a meter calibrated for air. The correction factor equation is as follows: Q2=Q1 x sqrt (1/S.G.) Where: Q1= Observed Flowmeter reading Q2= Standard Flow Corrected for Specific Gravity 1= Specific Gravity of Air or Water S.G.= Specific Gravity of media being used in flowmeter originally calibrated for air or water.
This equation can be found in the beginning of the Flow section in the catalog. Alternatively, special ranges and scales can be provided; for specific information please contact our customer service department.
For further information, see our "Tech & Specs" Video Blog: Fix your Flow... Specific Gravity and Pressure Corrections for Variable Area Flowmeters (Episode 4), in Dwyer's Video Library.
Question
For the VFA-44-BV product, what is the minimum flow that I can reliably control with a pressure head of up to 4 bar? Will the needle valve function properly at that pressure/flow combination? Thank you.
Answer
At a pressure of 4 bar (58 psi), the needle valve should function properly and provide reliable control over the whole range, which is 8-40 gallons of water per hour.
Question
Is a Dwyer Certificate of Conformance offered with any of the flowmeter models?
Answer
A standard Dwyer Certificate of Conformance can be offered with all Dwyer Mini-Master®, Rate-Master®, and Visi-Float® flowmeters on all water ranges (or other compatible liquids).
Question
Are special ranges available for the Rate-Master® and/or Visi-Float® Flowmeter?
Answer
Yes, other ranges are available which are not specified in our catalog. Please feel free to contact Dwyer with questions on these ranges.
Question
Is the Rate-Master® or Visi-Float® Flowmeter compatible with any media?
Answer
The Rate-Master® Flowmeter is manufactured from a polycarbonate plastic and the Visi-Float® Flowmeter is manufactured from acrylic. Compatibility charts need to be reviewed to determine if these materials of construction are compatible with your media.
Question
What factor is used to correct for different flowmeter inlet pressure?
Answer
If the flowmeter is exhausting to atmosphere, no correction factor is needed. If back-pressure is present due to downstream plumbing or restrictions, this error can be corrected utilizing the conversion curves in our full-line catalog or the following equation.

Pressure: Q2 = Q1 x √((P1 x T2)/(P2 x T1))

Where:
Q1 = Observed Flowmeter Reading
Q2 = Standard Flow Corrected for Specific Gravity
P1 = Actual Pressure (14.7 psia + Gage Pressure)
P2 = Standard Pressure (14.7 psia, which is 0 psig)
T1 = Actual Temperature (460 R + Temp °F)
T2 = Standard Temperature (530 R, which is 70°F)
Question
Which flowmeters are available with NIST traceability?
Answer
All Dwyer Mini-Master®, Rate-Master®, and Visi-Float® flowmeters are available with NIST traceability on all air ranges except for RMA-1, RMA-11, RMA-150, RMA-151, VFA-1, VFA-21 and VFB-60 models.

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