Key Instruments manufactures precision machined acrylic flow meters, molded plastic flow meters, glass tube flow meters, flow control valves, and other products for a wide variety of markets such as medical, industrial, chemical, semiconductor, water, the laboratory, and more

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Custom Flowmeters

Custom Flowmeters


Custom Flowmeters from Key Instruments, a Leading Flow Meter Manufacturer

Key Instruments manufactures custom variable area rotatmeters, pitot tube flowmeters, flow control valves, and custom machined plastic components such as flow cells or distribution manifolds. Our custom flow instrumentation is designed and manufactured to be durable, accurate, and suitable for use with water, low viscosity fluids, compressed air, steam, hazardous gases, and more in a variety of applications.


Our manufacturing capabilities provide our customers with the unique freedom to package the features that provide the functionality they require in a flow instrumentation solution that’s as unique in the marketplace as they want it to be.  Key frequently provides our customers with custom shapes and sizes, unique coloring, custom printing, private labelling, special connection types, and/or flow and pneumatic component assembly.


K.I.’s Custom Flowmeter Design Features

Incorporating more than 20 different design features, Key Instruments’ products can be customized to your exact preferences and subsystem or assembly requirements. For instance, our flowmeters can be configured with a control valve on the inlet, outlet or no valve at all and valves can be specified in brass or stainless steel. Upon request, O-rings can be provided with Buna-N, Viton®, or other optional elastomers.

Advantages of Key Instruments’ Custom Flowmeters Includes:

• Choice of inlet, outlet, or no valve configuration
• Available with Precision (16 turn) or standard valves (9 turn)
• Custom flow ranges, for many fluids can be designed
• Customer logo and colors can be printed directly on your flow meter
• Wide varieties of optional elastomers are available


At Key Instruments, we design and manufacture each flow meter for easy installation that meets and exceeds industry standards. For more information on individual products, see our Instructional Manuals. Each meter is tested to ensure a high level of accuracy and is available with a Certificate of Conformance (C.O.C.), which clearly states that your product has been manufactured, assembled, and tested to all agreed upon parameters as stated in your original purchase order. With only a few moving parts and an excellent compatibility to a variety of substances, our custom flowmeters are designed for extended and high-performance service life.


Superior Quality. Quick Delivery. Immense Capability.

The state-of-the-art manufacturing and production techniques we utilize result in higher quality products as well as lower costs. As a dependable custom flowmeter and rotameter manufacturer, we are excited to pass this savings on to you. Not only can we save you money, we can also save you time. Our team of engineers, designers, manufacturers, and technicians work directly with customers to deliver custom flow meters and flow solutions on schedule. At Key Instruments, high volume and tight deadlines are no problem; instead we rise to the challenge.

Rely on K.I.’s manufacturing, assembly, and testing processes to provide you with a better return on investment.

Custom Flow Meters

  • Design Engineering
  • Rapid Prototyping
  • Manufacture

Flow Instrumentation

  • Flow Meter Manufacturer
  • Rotameter Manufacturer
  • Flow Measurement

OEM Flow Meters

  • Arcylic
  • Glass
  • Polycarbonate
Key Instruments
250 Andrews Road
Trevose, PA 19053-3491 USA
In USA and Canada: (800) 356-7483
Direct: (215) 357-0893
Fax: (215) 357-9239
Email: sales@KeyInstruments.com
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At Key Instruments, our success is built on recognizing that product manufacturers need more from their flow instrumentation suppliers than simply providing a standard product catalog.  Manufacturers of medical equipment, industrial gas mixing and distribution systems, aquaculture control equipment, gas and liquid analyzers, water handling and treatment skids, and many others continue to partner with us due to our unique ability to drive costs out of the final product. When maintaining a world-class supply chain is critical, premier product manufacturers call Key.