Flow switches and sensors

Paddle Wheel and Turbine Sensors

Gems new generation of RotorFlow® sensors, the RF-2500 Series, have been totally re-engineered with a one piece composite rotor, stronger unibody construction, ceramic shaft and better sealing. The results are greater durability with broader chemical, temperature and pressure capabilities.

Paddle Wheel

• RFA Types - Accurate Flow Rate Indication with Integral Visual Confirmation , 0-10 VDC Analog Signal @ 1 mA Max  
• RFI Types - Bright Visual Flow Confirmation, Flow Ranges from 0.4 to 227.0 l/min, Removable Lens for Quick Cleanout, Available in Brass, Stainless Steel or High Performance Plastic Housings  
• RFO Types  - Accurate Flow Rate Indication with Integral Visual Confirmation, 4.5 to 24 VDC Pulsed Output
• RFS Types  - Combines visual confirmation of flow with dynamic, electronic switch operation, Easy, adjustable switch point calibration: a local LED signals when set point is reached
• RotorFlow Sensors Maintenance Kits  - Rebuild your RotorFlow Sensors and Switches in less than 5 minutes with one of these kits. Includes: Ceramic Rotor Pin, 6-Pole Magnetic Rotor with PPS/PTFE Bushing, Buna N or Viton O-Ring, Polysulfone Lens

More information you can find here: Paddle Wheel and Turbine Sensors  

Turbine sensors

• FT110 Series - Low Cost Plus High Accuracy ±3% of Reading, Measures Low Liquid Flow Rates of 0.5 to 30 L/Min (.1 to 8 GPM), Lightweight Plastic Design Enables Mounting in any Position, FT-110 Series 
• FT-210 Series - Low Flow Rates .1 to 2.5 LPM and High Accuracy ±3% of Reading, Lightweight Turbine Ensures Fast Startup, Mounts in Any Orientation  
• FT-330 Series - High Accuracy ±2% of Reading, High Repeatability ±0.5% of Reading, Overmolded electronics with integral cable strain reinforcement, Measures Flow Rates from .2 to 4 GPM, Lightweight Plastic Design for Multiple Mounting Positions

More information you can find here: Paddle Wheel and Turbine Sensors  

Flow Switches

Gems' line of flow switch devices and pressure switch instruments feature a broad range of configurations for use in liquids or gases. At preset rates, ranging from 50 cc/m to 100 GPM, a Gems flow switch will initiate alarm actuation or automatic shutdown of a system. These flow switch units 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.

There are 3 types - piston type, shuttle type and paddle type.

See more here: Flow Switch