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Dayton 40M287 mechanical flowmeter, 1 inch FNPT, aluminum housing with Viton seals

Dayton

Dayton 40M287 Mechanical Flowmeter 1 in 4 to 20 gpm

SKU CH-VAHK-7TK16

Measures 4 to 20 gpm of diesel, gasoline or oil with ±1 % accuracy through a 1 in FNPT aluminium housing rated to 150 °F

  • Mechanical display gives instant flow reading without power
  • +/-1% accuracy across 4-20 gpm range for reliable measurement
  • 1 inch FNPT connection fits standard plumbing systems
  • Aluminium housing with Viton seals handles diesel, gasoline and oils
  • Operates from -10°F to 150°F for wide temperature tolerance

Flow range and accuracy

The Dayton 40M287 mechanical flowmeter measures liquid flow between 4 and 20 gallons per minute with an accuracy of plus or minus 1 percent. A mechanical display shows the reading directly without requiring external power. It is suited for operators who need a simple, installed indication of flow rate in compatible piping systems.

Capacity and headroom

The meter handles diesel, gasoline and oils at viscosities up to 9,088 SUS across a media temperature span of -10 to 150 degrees Fahrenheit. Flow below 4 gpm or above 20 gpm falls outside the calibrated range and will not be indicated accurately. The housing and wetted parts use aluminum, PBT, stainless steel and Viton to resist the listed fluids.

Installation fit

The unit connects via a 1 inch FNPT thread and uses Viton O-rings and seals for the fluid seal. No electrical supply or signal wiring is needed for the mechanical display. Buyers who need electronic output, data logging or a different connection size will require a different meter type.

Highlights

  • Mechanical display gives instant flow reading without power
  • +/-1% accuracy across 4-20 gpm range for reliable measurement
  • 1 inch FNPT connection fits standard plumbing systems
  • Aluminium housing with Viton seals handles diesel, gasoline and oils
  • Operates from -10°F to 150°F for wide temperature tolerance

Specifications

BrandDAYTON

Questions about this item

Will the 1 in FNPT threads on this flowmeter match the existing 1 in NPT fittings on my older diesel pump?

Yes, the 1 in FNPT connection is designed to thread onto standard 1 in NPT male fittings used on older diesel, gasoline or oil lines.

How can I verify the mechanical display is reading within the stated +/-1 percent accuracy after installation?

Run a known volume through the meter at a steady rate between 4 and 20 gpm and compare the mechanical counter reading to the measured volume; it should fall within one percent.

Does the box include any gaskets or sealant for the Viton seals, or must I supply them?

The flowmeter ships with Viton O-rings and seals already installed in the aluminum housing; no additional gaskets or sealant are required for the FNPT connection.

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