Orifice plates, differential pressure flow measurement equipment, venturi tubes, ASME flow nozzles, restriction unions and more...
Over 50 Years of Differential Pressure Flow Metering Experience...

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Welcome to Lambda Square —
The Differential Pressure Flow Meter Specialists...
Since 1986, Lambda Square has specialized in the manufacture of differential pressure flow measurement equipment. Our company has been designing, testing and supplying industry around the world with differential pressure flow products and services since the 1950s.

In addition to in-house manufacturing, we have aligned ourselves with strategic fabrication
partners enabling us to offer a more complete and diversified line of differential pressure flow meters to meet a wide array of standards and specifications.

Marketing of our product line is done through a network of resellers, sales representatives, distributors and OEMs, as well as directly to end users for certain products. We currently have installations in all 50 states domestically as well as many countries throughout the world.
Lambda Square Provides a Wide Range of Flow Measurement Products and Services...


From mini to maximum in size, our products are found
throughout the world in many industries...

Lambda Square differential pressure flow meters feature single-piece construction with no moving parts, resulting in increased product life and maintenance free performance.

We provide complete flow measurement systems for gas, liquid and steam. Secondary instrumentation is available including indicating gauges, manifolds, transmitters, recorders, totalizers with a complete line of options.

Lambda Square provides meters for a wide array of applications and diversified markets, including aerospace, automotive, power plant, pulp and paper, fuel cell development, chemical, municipal and environmental as well as many others.




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Service: Liquids, Gases and Steam
• Sizes: 1/8" - 60" Standard - Custom Sizes - Our Specialty
• Flow Rate: Dependant on Line Size and Type of Meter.
• Pressure: Vacuum Through 10,000 PSIG
• Temp: -450 deg. F Through 1400 Deg. F
• Materials: 300 Series SS, Exotic Alloys, Brass, PVC, Carbon Steel, Monelฎ, P-11, P-22, Hastalloyฎ, Teflonฎ, etc.
• Differential Pressure: 0.001" - 500 PSID
• Standards: ASME, ANSI B31.1, ISA, NACE, ASTM, CRN, MFC, CE, AGA, IS0, DIN, Military and Nuclear.
• Traceable: NIST Standards, Nuclear & Military.
• Testing: Hydraulic and Pneumatic, NDE, Third Party Testing, Ultrasonic, X-ray, Heat Treating, Mag Particle, etc.
• Calibration of All Types of Flow Meters to NIST, ISO, IEC and other specs. Available through various NIST calibration facilities.
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Consulting and Start-up Service available.


Lambda Square, Inc • 1-800-587-5423 • Tel: 631-587-1000 • Fax: 631-587-1011


Lambda Square, Inc. specializes
in the manufacture of differential pressure flow measurement equipment including venturi tubes, orifice plate and orifice flanges, meter tubes, orifice holding blocks, orifice restriction unions, sanitary plates, single and dual chamber fittings, ASME flow nozzles, manifolds, straightening vanes, elbow flow meters, seal pots and many other liquid, gas and steam control products.
Please contact Lambda Square with any questions concerning design and custom manufacture.
ฉ Copyright 1998-2014 Lambda Square, Inc. All rights reserved.



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