Key Instruments

2500 Series Acrylic Tube Variable Area Flow Meters

Precision-machined acrylic. Economical liquid or gas measurement.

Models 2510 / 2520 / 2530 / 2540S or V / 2540I

Seeking an affordable solution for non-corrosive and low-pressure applications? Now there’s a clear choice: 2500 Series plastic variable area flow meters.

Constructed from precision-machined acrylic, 2500 Series flow meters use annealed, unibody construction that eliminates the leaks and panel detachment common with non-annealed, molded designs. An easy-to-read scale, rod-guided float and positive-stop valve ensure performance and safety. Choose from several valve, fitting, o-ring and float options to fit your specific project.


Questions on the 2500 Series?

Talk to one of our application engineering experts by calling: 215-788-5523
For pricing information:


  • Direct reading air or water scales available in English or metric scales
  • Measure flow rates from 40 ccm to 4000 lpm air and 4 ccm to 20 gpm water
  • Three accuracy levels to choose from: 2%, 3% or 5% Full Scale
  • Premium, threaded brass panel mounting inserts keep meter from detaching
  • Can be configured with a control valve (or no valve)
  • Fittings and valves available in brass, stainless steel or FNPT PVC pipe connections for in-line or panel mount
  • Removable back plate and hex head for wrench


  • Durable, one-piece, clear acrylic construction
  • Large scales are easy-to-read
  • Valve with positive stop stays in place under pressure
  • Rod guided float for stable measurements
  • Fitting, valve and o-ring options accommodate multiple applications
  • Multiple connection options for easier installation
  • Easy disassembly and assembly for maintenance


  • Air sampling equipment aquaculture
  • Desalinization equipment
  • Gas analyzers
  • Medical systems
  • Photo processing equipment
  • Water treatment and distribution systems
  • Purge
Product Type

Machined Acrylic Flow Meter


QuickShip Available


Flow Range (Full Scale Capacity)


4 – 3700 ccm
.2 – 60 gph
.25 – 20 gpm
1 – 75 lpm


100 -1000 ccm
0.04 – 4000 lpm
.1 – 200 scfh
.5 – 100 scfm


2-5% FS


Max Pressure

100 psig

Max Temperature

65oC (150oF)


Float Material

Black Glass
316 Stainless Steel
Delrin Acetal Resins

Seal Material

Buna-N O-rings w/Brass fittings or PVC fittings;
Viton O-rings w/303 SS fittings

Process Connection Material

303 Stainless Steel;
PVC FNPT Pipe Connections (Std).

Valve Materials

Brass or Stainless Steel
Integral Valve on “V” models
Inline Gate Valve on “S” and “I” models



File Type

Download the Files

Data Sheet


Installation & Operation Manual


Quick Start Guide