Hot Tub Heating System Uses a Reed Sensor to Sensor Water Flow

Introduction

The volume of hot tubs or spas are being used more and more around the world for medicinal reasons and for shear joy.  An essential part of a hot tub is its heating system.  There are very high wattage heaters that are designed into hot tubs for quick warm up.  If for some reason the water is not flowing and the heaters are activated, the heat would begin boiling and overheating of essential flow components resulting in some serious damage to the hot tub.  Hot tub designers have found a reliable solution using reed sensors...

Full application write up: Hot Tubs & Spa Heating Systems Use Reed Sensors to Detect Water Flow

Features

• Magnet and Reed Sensor are isolated and have no physical contact by typically having the magnet mounted to a mini paddle wheel or spring and the Reed Sensor is mounted strategically such that the magnetic field of the magnet will sense the spring or paddle wheel
• The reed switch used in the Reed Sensor is hermetically sealed and is therefore not sensitive to wet environments
• The magnet is not affected by its environment
• Tens of millions of reliable operations
• Surface mount and through-hole packages available
• Cylindrical hole and screw fastening mounting
• Contacts dynamically tested