Appliance Door Sensors

Introduction

Appliances, particularly refrigerators and freezers, must have their doors closed at all times. If the door is left open for any length of time the compartments will warm up and the food contained within will begin to spoil. Reed sensors are a simple choice to solve this problem…

Full Application Write Up

Door Detection - Reed Sensor

Features

Contacts dynamically tested
Cylindrical panel mount and screw fastening mounting
Magnet and reed sensor are isolated and have no physical contact by typically having the magnet mounted to the appliance door, and the reed sensors mounted and positioned usually on a PCB on the appliance chassis to accurately detect the opening of the appliance door
The reed switch used in the reed sensor is hermetically sealed and is therefore not sensitive to cold, wet and moist environments
The permanent magnet is not affected by its environment
Tens of millions of reliable operations
Surface mount and through hole packages available

Series	Dimensions	mm	inches
MK15	W	2.5	0.098
	H	2.5	0.098
	L	19.50	0.768
MK16	W	2.3	0.091
	H	2.3	0.091
	L	15.60	0.614
MK17	W	2.1	0.083
	H	2.1	0.083
	L	9.61	0.378
MK22	W	2.7	0.106
	H	2.3	0.091
	L	15.60	0.614
MK23-35	W	2.2	0.087
	H	1.95	0.077
	L	15.75	0.620
MK23-66	W	2.2	0.087
	H	2.7	0.106
	L	19.60	0.772
MK23-87	W	2.0	0.079
	H	2.1	0.083
	L	15.60	0.614
MK23-80	W	2.0	0.079
	H	2.1	0.083
	L	13.0	0.512
MK24	W	2.2	0.086
	H	1.8	0.070
	L	5.5	0.216

Series	Dimensions	mm	inches	Illustration
MK03	Dia	5.80	0.244	M03 magnet not included
MK03	L	25.5	1.004	M03 magnet not included
MK14	Dia	4	0.157
MK14	L	25.5	1.004
MK18	Dia	5	0.197
MK18	L	17	0.669
MK20/1	Dia	2.72	0.107
MK20/1	L	10	0.394