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Magnetically operated Reed Sensor with mounting holes for screw fastening

Characteristics

MK21 sensors are magnetically operated Reed proximity switches designed for screw mounting. The sensor should be mounted on a fixed surface with the actuating magnet on the moving surface.  Introduction or removal of the magnetic field determines the closing and opening of the Reed Switch.  Leads are Teflon coated.   The magnetic pull-in / drop-out sensitivity is divided into four AT ranges.  A choice of switches, termination options and cable lengths is offered.

Applications

• Position and limit switch
  e.g. pneumatic or hydraulic actuator position 
  indication and end travel limit switch
• Door and window contacts
  for security system applications
• Level Sensor
  use with magnetic floats for water level detection e.g. coffee-makers, washing-machines, dish-washers
• Machine Industry

Dimensions

Tolerance +/- 0.10mm (0.004 inch)

Termination

The standard termination is a two-wire flat cable with a cross section of 2 x 0.14mm². The standard length of the cable is 500mm, other lengths can be supplied on request. The required length has to be noted on the part number. The cable end can be supplied with the following connection styles (please note after the length in the part number).

W		Cable end cut, dismantled on 30 mm, cores stripped and tinned on 5 mm (0.2inch)

Contact Data

Contact type			71	84
Contact form			A/dry	A/dry
Rated Power	max.	(W)	10	10
Switching voltage	max.	(VDC)	1801	400
Switching current	max.	(A)	0.5	0.5
Carry current		(A)	1.02	1.0
Contact resistance	max.	mOhm	150	150
Breakdown voltage (contact/contact)	min.	(VDC)	2103	700
Operating time incl. bounce		(ms)	0.5	0.5
Releasing time		(ms)	0.1	0.1
Operating temperature		(°C)	-20/+85	-20/+85
Storing temperature		(°C)	-35/+85	-35/+85

¹Range D & E: 200 VDC  ²Range D & E: 1.75 A  ³Range D: 280 VDC; Range E: 310 VDC

Other switches by request.

 

Magnetic Sensitivity

Sensitivity class	B	C	D	E
Pull-in AT range	10-15	15-20	20-25	25-30
Available switches	71	71/84

This data relates to unmodified Reed Switches before mounting. Please refer to the respective single data sheets for sensitivity data and measurement methods for finished assemblies.

Order information

Ordering example

MK21 - 1A71 C - 500 W

MK4 Reed Sensor, 1 form A switch type 71, Sensitivity class C, Cable length 500mm, Termination W

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