MEDER electronic
MK21 Series
Reed Sensors with Mounting
Holes for Screw Fastening
DESCRIPTION
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. Designed for extreme
environment. High temperaturs, 150 °C Imprevions to
water, fuels, oils, inks and most acids.
APPLICATIONS
•
Position and limit switch
Pneumatic or hydraulic actuator position
•
End motion detection for linear drive
Indication and end travel limit switch
•
Machine industry
End motion detection and door/flap control
FEATURES
•
•
•
•
High power switches available
Other cables, connectors and colors available
Four operate sensitivities available
A choice of cable terminations and lengths are
available
DIMENSIONS
All dimensions in mm [inches]
Germany # ++49-(0)7733-94870, USA # 800-870-5385
www.meder.com
225
MK21 Series
Reed Sensors with Mounting
Holes for Screw Fastening
MEDER electronic
ORDER INFORMATION
SERIES
CONTACT
FORM
1A
SWITCH
MODEL
XX
66
OPTIONS
84
* Other cable lengths available.
C, D, E
MAGNETIC
SENSITIVITY
X -
B, C , D , E
500 *
CABLE
LENGTH
(mm)
XXX
Part Number Example
TERMINATION
MK21 - 1A66 C - 500
W
MK21 -
W
66
is the switch model
C
is the magnetic sensitivity
500
is the cable length (mm)
MAGNETIC SENSITIVITY
SENSITIVITY
CLASS
PULL IN
AT RANGE
B
C
D
E
10 - 15
15 - 20
20 - 25
25 - 30
TERMINATION
For wire and termination details please contact factory.
www.meder.com
226
Germany # ++49-(0)7733-94870, USA # 800-870-5385
MEDER electronic
MK21 Series
Reed Sensors with Mounting
Holes for Screw Fastening
CONTACT DATA
All data at 20
0
C
Contact Ratings
Switching Power
Switch Model -->
Contact For m -->
Conditions
Any DC combination of V & A
not to exceed their individual
max.'s
DC oder peak AC
DC oder peak AC
DC oder peak AC
w/ 0.5 V & 10mA
Measured w/ 0.5 V & 50 mA
1.5 ms after closure
100 Voltapplied
Voltage applied for 60 sec.
min.
Measured w/ 50 % overdrive
Measured w / no coil
suppression
@ 10 kHz across contact
Switch 66
For m A
Min.
Typ.
Max.
Switch 84
For m A
Min.
Typ.
Max.
Units
10
10
W
Switching Voltage
Switching Current
Carry Current
Static Contact Resistance
Dynamic Contact Resistance
Insulation Resistance across
Contact
Breakdown Voltage across
Contact
Operate Time, incl. Bounce
Release Time
Capacitance
200
0.5
1.25
150
200
400
0.5
1.0
150
200
V
A
A
mΩ
mΩ
Ω
10
10
*
10
11
225 *
0.5
0.1
0.2
700
2.0
0.1
0.7
VDC
ms
ms
pF
Contact Operation**
Must Operate Condition
Must Release Condition
Steady state field
Steady state field
10
4
30
27
15
6
30
27
AT
AT
Environmental Data
Shock Resistance
Vibration Resistance
Ambient Temperature
Storage Temperature
Soldering Temperature
½ sine wave duration 11 ms
From 10 - 2000 Hz
10
0
C/ minute max. allowable
10
0
C/ minute max. allowable
5 sec. dwell
-30
-40
50
20
150
160
260
-30
-40
50
20
150
160
260
g
g
0
C
C
C
0
0
Please note: The indicated electrical data are maximum values and can vary downwards when using a more sensitive switch.
* Insulaton resistance of 10
12
and breakdown voltage of 480 VDC is available.
** These ranges refer to the uncut / unmodified Reed Switches described in our Reed Switch section. Consult factory if more
detail is required.
Germany # ++49-(0)7733-94870, USA # 800-870-5385
www.meder.com
227
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