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Coffee Maker Water Level Sensor

Introduction

In many of the newer coffee machines, without permanent water connections for commercial or domestic applications, a low water indicator lamp signals the minimum water level. In this case a permanent magnet is built into a float housing installed in a removable plastic water tank.

The positioning of the Reed Switch and the magnetic strength of the magnetic float guarantee the switching of the contacts when the water level drops to the level of the Reed Switch sensor position. By design, the switch sensor remains closed even after the water level continues to drop well below the minimum water level.

In the machine itself, a Reed Switch is mounted behind a plastic or aluminum cover. The magnetic contacts of our MK03 and MK04 series, for example, offer the sensing requirements suitable for this application.

The construction of the water tank is usually designed to insure that at least 2 cups of water remain once the minimum water level has been reached. The Reed Switch will only open (and thereby turn off the low water light) when the water level has been sufficiently refilled such that the magnetic float is above the minimum water level mark.

In the case of coffee machines with permanent water connections, the same sensor approach applies except for the fact that the indicator light is removed and a water-switching valve is added.

Generally speaking, this approach works well for all similar fluid level applications.

Full Application Write Up
Coffee Maker Components - Liquid Level SensorCoffee & Espresso Machines - Reed Sensor
SeriesDimensionsmminchesIllustration
MK04W13.90.547
MK04 Reed Sensor Dimensions

M04 magnet sold separate

H5.90.232
L23.00.906
MK05W19.60.772
MK05 Reed Sensor

M05 magnet sold
separate

H6.10.240
L23.20.913
SeriesDimensionsmminchesIllustration
MK03Dia5.800.244
MK03 Reed Sensor

M03 magnet not included

L25.51.004
MK14Dia40.157 MK14 Reed Sensor
L25.51.004
MK18Dia50.197 MK18 Reed Sensor
L170.669
MK20/1Dia2.720.107 MK20/1 Reed Sensor
L100.394

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