Active Design Assures Reliability Cannot Jam in “Flow OK” Position Models span 0.08 to 60.0 GPM Adjustable Trip Point

Change notice: In 2019, the 100 series product line has been upgraded from non-RoHS compliant to RoHS compliant. Additionally, the rotor material has been changed from a Nylon-based composite to a PPS based composite. There is no change to form, fit or function. Customers with specific configuration control requirements, such as Copy Exact, have been notified in accordance with their requirements. Please contact our Technical Support if you have any questions at or (650) 964 – 4163.

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(650) 964-4163

(650) 965-0304

For special orders and California reseller with a resale certificate, please call us directly to place your order.

Detailed product inquiries:

Technical inquires:

Phone: (650) 964-4163

Proteus offers free samples of standard Proteus-manufactured flow switches or flow meters for evaluation in new applications by prospective OEM customers.

To request a free sample, please send an e-mail describing your application to with “Free Sample” in the subject line. Be sure to include your name, the name of your company, the address to which the sample should be sent and your telephone number. You may also call Mark Malfatti or David Chiasson at (650) 964-4163.

Who is an OEM?


OEM customers are those who incorporate our product into their own product for commercial sale to end users. Usually, you will have a website or product data sheet showing a product that incorporates flow measurement.

WeldSaver™ products, Tofco flow products and Florite control units are not included in this offer. There is a limit of one free sample per customer. Proteus Industries retains the sole right to determine which companies are qualified OEMs for the purpose of this offer.

  • 100 series flow switch
  • liquid level switch for meters
  • liquid flow switch
  • 100 Series Flow Switches

100 Series

100 Series Flow Switches

• Flow rates from 0.2 to 227 LPM / 0.06 to 60 GPM
• Adjustable trip point
• Flow switch cannot jam in Flow OK position
• 5-year warranty