Flow Switches Page Start Thermal Dispersion Piston Shuttle Paddle Unique Designs . . . For Use in Liquids or Gases GEMS’ line of flow switches features a broad range of configurations for use in liquids or gases. At preset rates, ranging from 50 cc/min. to 100 GPM, GEMS switches will initiate alarm actuation or automatic shut-down of a system. These switches feature high quality, corrosion-resistant materials for use in the toughest environments. Material choices, ranging from stainless steel to Ryton®, offer vast chemical compatibility. Versions include switches with fixed or adjustable actuation settings, models for viscosity compensation or high pressures, in-line models and designs to satisfy any mounting or space requirement. Variety of Operating Principles The versatile GEMS Flow Switch line utilizes four basic operating principles. This catalog is organized into four operational types: Piston, Shuttle, Paddle and Electronic. The Shuttle models are for use with high flow rates; the Piston types are designed for low flow rates; the Paddle for large line sizes and the Electronic switches encompass state-of-theart electronics and positive visual indication. Piston Types Switch Series Body Materials Alloys Engineered Plastics FLOW SWITCHES Flow Rate Selection Guide Shuttle Types Dependent on Pipe Size and Paddle Length Engineered Plastics Alloys Engineered Plastics Paddle Types Visit www.GemsSensors.com for most current information.

FS-600 Series – No Moving Part, Thermal Dispersion Flow Switch Flow Rate Settings: 0.1 GPM to 11 GPM (0.5 LPM to 41 LPM) Port Size: 1/2˝ to 1-1/2˝ (NPT or G thread) Setting Type: Fixed The FS-600 series uses proven thermal dispersion technology to provide a robust no moving part flow switch even without filtration. The solid state sensor is compatible with both conductive and non-conductive fluids. Suitable for fluids with particulates or slurries, and is immune to changes in media viscosity. The straight through switch is designed for a long life and can be mounted in any orientation and can...

THERMAL DISPERSION TYPE Part Numbers Notes: 1. Setpoints based on water flow. Contact factory for setpoints of alternate media. 2. G threads are available upon request. Minimum order quantities apply. Contact factory. 3. -5 through -60 = fluid velocity (cm/s) FLOW SWITCHES Part Numbers Port Size Flow Setting NPT GPM LPM Port Size Flow Setting NPT GPM LPM Specify Part Number based on water flow rates for the FS-600 Series per the following chart. Fluid Velocity vs. Flow Rate in GPM/LPM in Water How To Order – Standard Models Accessories Description M12 cord Set-1 meter (Red 1, Green 2, Blue 3,...

Piston Type Switches – For Low Flow Rates in Liquids and Gases Models for liquid flow rates as low as 50 cc/min. and gas flow rates as low as 2 SCFH Small, compact housings with port sizes from 1/4˝ NPT Precision built for superior accuracy Typical Applications Protect your expensive electronic equipment from coolant flow failure on... • Laser Heads • Welders • Power Supplies • High Speed Spindles • X-Ray Tubes • Semiconductor Equipment Assure proper lubrication flow to critical bearings or gears to prevent system downtime on... • Presses • Rotating Equipment • Conveyors • Machine Tools • Robotics...

PISTON TYPE Viscosity Compensating Switches Page Start Partial Cutaway (FS-930 Series) VISCOSITY COMPENSATING PISTON When temperatures of viscous fluids change, so do their flow properties. With viscosity lowered by increasing temperature, a greater flow is generally required to create actuation pressure differential. A unique patented piston within GEMS FS-930 Series switches accommodates these changes in fluid viscosity while maintaining accurate switch actuation. Units can detect flow rates with 20% accuracy for liquid viscosities between 40 to 1000 SSU. Low Pressure Drop Switches OVER-MOLDED...

FS-4 Series – Low Cost, Molded Plastic Construction Flow Rate Settings: 0.1 GPM to 1.5 GPM Port Size: 9/16˝-18 UNF Primary Construction Material: Ryton® Setting Type: Fixed The FS-4 Series makes flow protection economical for a broad range of industrial applications such as welders, lubrication systems, medical sterilizers and laundry chemicals dispensing. U.L. Recognized — File No. E31926 CSA Listed — File No. LR30200 Specifications Wetted Materials Housing and Piston Other Wetted Parts Operating Pressure, Maximum Operating Temperature SPST or SPDT, 20 VA (SPDT: 240 VAC Max.) Inlet/Outlet Ports...

PISTON TYPE FS-150 Series – Straight Flow Path with Low Pressure Drop Flow Rate Settings: Liquids: 0.5 GPM to 5 GPM Port Size: 1/2˝ NPT Primary Construction Material: Polypropylene Setting Type: Fixed These slim, inline switches reduce pressure drop to a minimum. They incorporate a unique, dual-diameter, internal bore and piston configuration to minimize flow constriction. Liquids are able to smoothly pass around the piston and flow through the switch with little pressure loss to the down stream line. U.L. RECOGNIZED — FILE NO. E31926 CSA Listed — File No. LR30200 Specifications Wetted Materials...

FS-380 Series – Compact Flow Switch for High Inline Pressures Flow Rate Settings: 0.15 GPM to 2.00 GPM Port Size: Multiple Primary Construction Material: Brass or Stainless Steel Setting Type: Fixed These rugged inline flow switches require 100 micron filtration and are less susceptible to clogging than other high-pressure inline flow switches. The onepiece magnetic PPS composite piston makes the FS-380 ideal for high-pressure applications such as industrial cleaning equipment. The FS-380 is also an excellent choice for semicon cooling applications where simple design and reliable operation are...

PISTON TYPE FS-380P Series – Industrial Strength Inline Plastic Flow Switch Flow Rate Settings: 0.07 GPM to 2.00 GPM Port Size: 3/8˝ NPT Male and 1/4˝ Quick Disconnect (QDC) Male Primary Construction Material: Polypropylene Setting Type: Fixed This rugged inline flow switch offers the same superior performance to non-clogging as its metal cousin (FS-380). The fixed set point and simple design make it a dependable switch. The FS-380P is an ideal choice for coolant applications requiring reliable flow detection in HVAC, semiconductor, welding, medical and other industries. 1/4˝ quick disconnect...