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Flow Switch

Thomas Products provides the highest quality flow switches the industry has to offer and all of our flow switches are manufactured in house and stocked for immediate delivery, however if you are looking for an item and you don't see it please either chat with us or visit our contacts page here and we'll be happy to help!

Our units offer reliable protection against pipeline flow variation for liquids or gasses. Our solid, non-porous brass or stainless steel body eliminates leaks into electrical chambers to offer the highest level of safety possible. Our flow switches are designed for a large spectrum of clean, contaminated and corrosive industrial fluids, if you aren't sure about substance or chemical compatibility, please let us know and we will do our best to steer you in the right direction!

We manufacture our flow switches and flow sensors in a variety of materials including metals like bronze, brass, SST, Monel and others, we also commonly manufacture units in plastics such has PVC, polypropylene and polysulfone. If you would like a unit manufactured in another material, we can custom build assemblies in just about anything! No job is too big or small for Thomas!

Take a look through our site and see what we can offer your company, or reach out to us through our contacts page, we have qualified sales reps ready to assist you!


Please choose below if you are looking for a flow switch calibrated for either gasses or liquids.


$148.00
Model 1600, Liquid Flow Switch, In-line/ Pipe Installation, Includes Dual 7/32" Mounting Holes For Flexible Tubing/ Solid Mounting, Brass, 1/4" FNPT, 0.1 GPM, SPDT 20VA Pilot Duty, -14.7 to 1000 PSIG, -20°F to 225°F w/ PSF piston, -20°F to 300°F w/ metal piston

$148.00
Model 1600, Liquid Flow Switch, In-line/ Pipe Installation, Includes Dual 7/32" Mounting Holes For Flexible Tubing/ Solid Mounting, Brass, 1/4" FNPT, 0.25 GPM, SPDT 20VA Pilot Duty, -14.7 to 1000 PSIG, -20°F to 225°F w/ PSF piston, -20°F to 300°F w/ metal piston

$148.00
Model 1600, Liquid Flow Switch, In-line/ Pipe Installation, Includes Dual 7/32" Mounting Holes For Flexible Tubing/ Solid Mounting, Brass, 1/4" FNPT, 0.5 GPM, SPDT 20VA Pilot Duty, -14.7 to 1000 PSIG, -20°F to 225°F w/ PSF piston, -20°F to 300°F w/ metal piston

$148.00
Model 1600, Liquid Flow Switch, In-line/ Pipe Installation, Includes Dual 7/32" Mounting Holes For Flexible Tubing/ Solid Mounting, Brass, 1/4" FNPT, 0.75 GPM, SPDT 20VA Pilot Duty, -14.7 to 1000 PSIG, -20°F to 225°F w/ PSF piston, -20°F to 300°F w/ metal piston

$148.00
Model 1600, Liquid Flow Switch, In-line/ Pipe Installation, Includes Dual 7/32" Mounting Holes For Flexible Tubing/ Solid Mounting, Brass, 1/4" FNPT, 1.0 GPM, SPDT 20VA Pilot Duty, -14.7 to 1000 PSIG, -20°F to 225°F w/ PSF piston, -20°F to 300°F w/ metal piston

$148.00
Model 1600, Liquid Flow Switch, In-line/ Pipe Installation, Includes Dual 7/32" Mounting Holes For Flexible Tubing/ Solid Mounting, Brass, 1/4" FNPT, 1.5 GPM, SPDT 20VA Pilot Duty, -14.7 to 1000 PSIG, -20°F to 225°F w/ PSF piston, -20°F to 300°F w/ metal piston

$148.00
Model 1600, Liquid Flow Switch, In-line/ Pipe Installation, Includes Dual 7/32" Mounting Holes For Flexible Tubing/ Solid Mounting, SST, 1/4" FNPT, 0.1 GPM, SPDT 20VA Pilot Duty, -14.7 to 1000 PSIG, -20°F to 225°F w/ PSF piston, -20°F to 300°F w/ metal piston

$274.00
Model 1600, Liquid Flow Switch, In-line/ Pipe Installation, Includes Dual 7/32" Mounting Holes For Flexible Tubing/ Solid Mounting, SST, 1/4" FNPT, 0.25 GPM, SPDT 20VA Pilot Duty, -14.7 to 1000 PSIG, -20°F to 225°F w/ PSF piston, -20°F to 300°F w/ metal piston

$274.00
Model 1600, Liquid Flow Switch, In-line/ Pipe Installation, Includes Dual 7/32" Mounting Holes For Flexible Tubing/ Solid Mounting, SST, 1/4" FNPT, 0.5 GPM, SPDT 20VA Pilot Duty, -14.7 to 1000 PSIG, -20°F to 225°F w/ PSF piston, -20°F to 300°F w/ metal piston

$274.00
Model 1600, Liquid Flow Switch, In-line/ Pipe Installation, Includes Dual 7/32" Mounting Holes For Flexible Tubing/ Solid Mounting, SST, 1/4" FNPT, 0.75 GPM, SPDT 20VA Pilot Duty, -14.7 to 1000 PSIG, -20°F to 225°F w/ PSF piston, -20°F to 300°F w/ metal piston

$274.00
Model 1600, Liquid Flow Switch, In-line/ Pipe Installation, Includes Dual 7/32" Mounting Holes For Flexible Tubing/ Solid Mounting, SST, 1/4" FNPT, 1.0 GPM, SPDT 20VA Pilot Duty, -14.7 to 1000 PSIG, -20°F to 225°F w/ PSF piston, -20°F to 300°F w/ metal piston

$274.00
Model 1600, Liquid Flow Switch, In-line/ Pipe Installation, Includes Dual 7/32" Mounting Holes For Flexible Tubing/ Solid Mounting, SST, 1/4" FNPT, 1.5 GPM, SPDT 20VA Pilot Duty, -14.7 to 1000 PSIG, -20°F to 225°F w/ PSF piston, -20°F to 300°F w/ metal piston