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Direct Read, Panel Mount Variable Area Flow Meters

Direct Read Variable Area Flow Meters


Item# FLDA3203ST

In stock

Lead Time (If not in stock): 4 weeks
Direct Read Variable Area Flow Meters FLDA3203ST FLDA3203ST
  • Direct Read Variable Area Flow Meters 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

FLDA3203ST Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

Media Type
Gas Flow Range
Liquid Flow Range
Wetted Materials
Valve Included
Process Connection Type
Process Connection Size
Max Operating Pressure
Max Process Temperature

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-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 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.

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)

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: 1/8' thick white acrylics
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 NPT female inlet and outlet connections
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Rated 5 out of 5 by from I got Flow Control... Omega always has a great selection of products & technical data so you can find what you need...and this was no exception. The right flow range for the job.
Date published: 2018-12-12
Rated 5 out of 5 by from Wonderful product Wonderful product with exact presision, also has an excellent duration
Date published: 2024-05-31
Rated 5 out of 5 by from Hydrogen Flowmeter Thank you Omega for custom suppling me the Hydrogen Flow meter, which is not available on the market, in a very short time , even beating the estimated time, one again I can't thank you enough. Kevork
Date published: 2024-04-30
Rated 5 out of 5 by from Flow Meter Great product for measuring liquid or gas. Comes in handy.
Date published: 2024-04-15
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For the product FLDN3305G, the readings are in STANDARD LPM?

Asked by: PE1234
Thank you for your inquiry. The FLDN3305G has a range of up to 120mL/min. The units on the scale will be in mL/min.
Answered by: AS Engineer
Date published: 2020-04-29

Where do I reed the ball on the FLDA3214G-NV flow meter. The top or the center?

Asked by: Dgo1
Thank you for your inquiry about the rotameters. The Rule of Thumb is to read the flow rate at the highest and widest part of the float and in this case, a sphere will be the center.
Answered by: Application Engineer JC
Date published: 2023-08-15

Ordered an FLDA3420C-NV rotameter. Per spec sheet it has a max flow of 10 L/min. But now see the website says the units are SCFM and the readings on the meter go to 10. Which is the correct measurement unit?

Asked by: Remote Alaska
Thanks for your question? The part number, FLDA3420C-NV, rota-meter with no valve has been confirmed to have a max flow capacity of 10 LPM.
Answered by: application engineer je
Date published: 2019-07-15

Certificate Traceable to NIST

Asked by: DoctorKong
Thank you for your inquiry for this rotameter. Unfortunately, there is no option for a NIST certificate for this series, you may consider the FL-3600, 3700, 3800, and 3900 series.
Answered by: Application Engineer JC
Date published: 2021-01-26

How do I read the flow meter / take the reading of FLDA3212ST model? Do I read the float at the top, middle or bottom? The model we got is FLDA3212ST

Asked by: Cathy2023
Thank you for your inquiry about the rotameters. The Rule of Thumb is the highest and widest part of the float.
Answered by: Application Engineer JC
Date published: 2023-03-11
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