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.

NIST CALIBRATION available in Product Configurator.

California Residents: Click Here for Proposition 65 WARNING.

Product Applications

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

View All Product Images

Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

Build Your Custom Part. Use our Product Configurator

Model	Description	Usually Ships*	Price	Order
VFA-1 Ships: Next Day Price: $37.50	Flowmeter, range .1-1 SCFH air.	Next Day*	$37.50	Order
VFA-2 Ships: 1-2 Weeks Price: $37.50	Flowmeter, range .2-2 SCFH air.	1-2 Weeks*	$37.50	Order
VFA-21 Ships: Next Day Price: $37.50	Flowmeter, range .06-0.5 LPM air.	Next Day*	$37.50	Order
VFA-22 Ships: Next Day Price: $37.50	Flowmeter, range .15-1 LPM air.	Next Day*	$37.50	Order
VFA-23 Ships: Next Day Price: $37.50	Flowmeter, range .6-5 LPM air.	Next Day*	$37.50	Order
VFA-24 Ships: 1-2 Weeks Price: $37.50	Flowmeter, range 1-10 LPM air.	1-2 Weeks*	$37.50	Order
VFA-25 Ships: 1-2 Weeks Price: $37.50	Flowmeter, range 3-25 LPM air.	1-2 Weeks*	$37.50	Order
VFA-26 Ships: Next Day Price: $37.50	Flowmeter, range 6-50 LPM air.	Next Day*	$37.50	Order
VFA-27 Ships: 1-2 Weeks Price: $37.50	Flowmeter, range 10-100 LPM air.	1-2 Weeks*	$37.50	Order
VFA-3 Ships: Next Day Price: $37.50	Flowmeter, range .6-5 SCFH air.	Next Day*	$37.50	Order
VFA-32 Ships: 1-2 Weeks Price: $37.50	Flowmeter, range 6-50 cc/min water.	1-2 Weeks*	$37.50	Order
VFA-33 Ships: 1-2 Weeks Price: $37.50	Flowmeter, range 10-100 cc/min water.	1-2 Weeks*	$37.50	Order
VFA-34 Ships: 1-2 Weeks Price: $37.50	Flowmeter, range 20-200 cc/min water.	1-2 Weeks*	$37.50	Order
VFA-4 Ships: Next Day Price: $37.50	Flowmeter, range 1-10 SCFH air.	Next Day*	$37.50	Order
VFA-41 Ships: 1-2 Weeks Price: $37.50	Flowmeter, range .6-5 GPH water.	1-2 Weeks*	$37.50	Order
VFA-42 Ships: Next Day Price: $37.50	Flowmeter, range 2-10 GPH water.	Next Day*	$37.50	Order
VFA-43 Ships: 1-2 Weeks Price: $37.50	Flowmeter, range 3-20 GPH water.	1-2 Weeks*	$37.50	Order
VFA-44 Ships: 1-2 Weeks Price: $37.50	Flowmeter, range 8-40 GPH water.	1-2 Weeks*	$37.50	Order
VFA-5 Ships: 1-2 Weeks Price: $37.50	Flowmeter, range 2-20 SCFH air.	1-2 Weeks*	$37.50	Order
VFA-6 Ships: Next Day Price: $37.50	Flowmeter, range 4-30 SCFH air.	Next Day*	$37.50	Order
VFA-7 Ships: Next Day Price: $37.50	Flowmeter, range 5-50 SCFH air.	Next Day*	$37.50	Order
VFA-8 Ships: 1-2 Weeks Price: $37.50	Flowmeter, range 10-100 SCFH air.	1-2 Weeks*	$37.50	Order
VFA-9 Ships: Next Day Price: $37.50	Flowmeter, range 20-200 SCFH air.	Next Day*	$37.50	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: Nickel plated brass standard, SS optional; Float: SS, 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
	RKA	Regulator kit for RMA or VFA.	Next Day	$263.00	Order
	RK-VFB	Regulator kit for VFB.	1-2 Weeks	$263.00	Order

Videos

Fix your Flow Specific Gravity and Pressure Corrections for Variable Area Flowmeters (Episode 4)

Series VFA and VFB Visi-Float Flowmeter

Variable Area Flowmeters

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

Series VF Catalog Page

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.

Related

Series VFC/VFCII

Series VF

Series MM

Series RM

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.

Related

Series VF

Series RM

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).

Related

Series VFC/VFCII

Series MM

Series VF

Series RM

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.

Related

Series VFC/VFCII

Series RM

Series VF

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.

Related

Series VF

Series RM

Series VFC/VFCII

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)

Related

Series RM

Series VFC/VFCII

Series MM

Series VF

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.

Related

Series VF

Series MM

Series VFC/VFCII

Series RM

Question

I Need a variable area flowmeter that will work with hydrogen, will any of the poly bodied units like the RMA/B work, or do I need a glass vial?

Answer

Yes, can use the Series RM or VF with hydrogen.

Related

Series VF

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.

Related