Gems Sensors offers shuttle flow sensors in both plastic and alloy construction. Plastic flow shuttles (PVC or polypropylene) are available in 0.25 to 5.0, and 0.5 to 2.0 GPM ranges, and have 3/4" port size and fixed settings. Alloy flow shuttles (bronze or stainless steel) are available in 0.75 to 14.0, 0.75 to 10.0 and 0.5 to 100.0 flow rates and are available in either fixed or adjustable settings.

Innovative solutions have two types of flow switches: the F003A Series adjustable in-line, and the F003 Series in-line water flow switch to 50 GPM. The F003A can monitor 0.75 to 4.0 and 2.0 to 8.0 GPM, and has a removeable bonnet for easy cleaning without pipe removal. The F003 is designed to measure flow up to 50 GPM and also has a removeable bonnet, and has a bronze body with a teflon shuttle mechanism.

Grainger distributes Gems liquid flow shuttle sensors in both bronze and PVC/polypropylene body styles. Flow measurement ranges from 0.5 to 6 GPM depending on design, and can handle fluids from -20F to 200F with SPST and SPDT switch types.

The Dwyer Series P5 PVC shuttle flow switch is corrosion resistant, with a clear visual housing for simple flow/no flow observation. Inlet/outlet ports are available in 1/2" NPT or 3/4" & 1" IPS, and all shuttle flow switches only have a single moving part for minimum maintenance and maximum life.

John C. Ernst has a range of flow switches for liquids, air and gasses. The model 345 electric flow switch has a visual pointer for easy flow documentation, the 357/353 flow switch is designed for in-line, bi-directional processing, while the others are all reed-style shuttle flow switches, rated for 0.5 to 100 GPM.

Drill Spot's 3/4" FNPT bronze liquid flow switch has a contact rating of 20VA, and it calibrated to measure flow rates between 0.75 and 4.0 GPM. It has a functional temperature range of -20F to 180F and had a recommended filtration of 150 Microns.

Zoro Tools FS-500 series polypropylene flow switches are designed for threaded plastic piping (3/4" FNPT) with a temperature range from 0 to 212F, a maximum operating pressure of 100 PSI and a contact rating of 20VA.

The Myron L Company has a noryl GFN3 flow switch designed for liquid monitoring, with a temperature range of  0 to 194F, and a pressure limit of 100 PSIG. The switch is designed to be installed in any position, but the reed actuator is designed for vertical up-flow pipe runs, and are displayed in nominal values.

CalPacific Equipment is a distributor of Gems shuttle sensors, available in plastic and alloy, designed for water purification, gas and petroleum-based products. They can also be modified for process systems, including filtration, reverse osmosis, chlorination, de-icing, sterilizers and evaporation systems.