The Flow Switch Division of Thomas Products offers both fixed and adjustable set point flow sensors. The 1100 Series fixed set point unit is housed in bronze or stainless steel, with NPT sizes from 0.75" to 3", operating pressures up to 400 psi, and proof loads up to 800 psi. Other fixed set point series include the 1300, for coolant systems and HVAC, 1600, for machine tooling and lubrication systems, and polysulfone 2100 and 2200. Adjustable set point sensors include the 1200 Series, in three sizes for flow settings from 0.75 to 15 GPM; 1400 Series, for 0.75" NPT up to 14 GPM; 1500 Series, 0.5" NPT in brass or stainless steel, for proof loads up to 2,500 psi; and 2400 and 2500 Series paddle type flow switches in brass, stainless steel, or plastic.

Harwil's Q-Series provides a variety of fluid flow switches. Materials include red brass, Hastelloy, 316 stainless steel, Noryl, and Fortron. These sensors are available in pipe sizes of 0.75" and greater, with electrical ratings from 15 amp 125/250 VAC, and temperature/pressure ratings up to 250 degrees Fahrenheit/300 psi. Products start with the Q-1, for flows from 0.12 to 8 GPM, up to the Q5SS, for flows from 10 to 102,000+ GPM.

Three types of flow sensors are carried by Futurlec. The Flow08L0 is a 0.8 to 8 l/min sensor for use in water conservation systems, storage tanks, water recycling home applications, and irrigation systems where water does not exceed 40 degrees Fahrenheit. Its fitting is for a 0.25" pipe. The Flow14L1 senses flow rates from 1.5 to 14.1 l/min for many of the same applications listed above, but for a larger, 0.375" pipe. Lastly, the Flow25L0 is meant for flow rates from 1.5 to 25 l/min, 0.5" pipes, and temperatures up to 80 degrees Celsius.