MK18

Meder Electronic
MK18 Series
Cylindrical
Reed Sensors
DESCRIPTION
MK18 sensors are magnetically operated Reed
proximity switches in a cylindrical module, fitted with
interconnect cable. 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.
APPLICATIONS
• Position and limit switch
Pneumatic or hydraulic actuator position
Indication and end travel limit switch
• Door and window contacts
Security system applications
• Level sensor
Use with magnetic floats for water level
detection in coffee makers, washing machines
or dishwashers
FEATURES
• Flat side indicates maximum sensitivity
• Small size
• Other cables, connectors and colors available
• Three operate sensitivities available
• A choice of cable terminations and lengths are
available
DIMENSIONS
All dimensions in mm [inches]
www.willow.co.uk
Tel. +44 (0) 1342 835234
Fax. +44 (0) 1342 834306
MK18 Series
Meder Electronic
Cylindrical
Reed Sensors
ORDER INFORMATION
SERIES
MAGNETIC
SENSITIVITY
CABLE
LENGTH
(mm)
TERMINATION
MK18 -
X -
XXX
X
OPTIONS
B, C, D
100 *
W, X, Y
Part Number Example
MK18 - C - 100
W
C is the magnetic sensitivity
100 is the cable length (mm)
W is the termination
* Other cable lengths available.
MAGNETIC SENSITIVITY
SENSIT IVITY
CLASS
PULL IN
AT RANGE
B
10 - 15
C
15 - 20
D
20 - 25
TERMINATION
For wire and termination details please consult factory.
www.willow.co.uk
Tel. +44 (0) 1342 835234
Fax. +44 (0) 1342 834306
Meder Electronic
MK18 Series
Cylindrical
Reed Sensors
CONTACT DATA
All data at 20 0 C
Contact Form -->
Contact Ratings
Conditions
Form A
Min.
Typ.
Max.
Units
10
W
Contact Rating
Any DC combination of V & A not
to exceed their individual max.'s
Switching Voltage
DC or peak AC
200
V
Switching Current
DC or peak AC
0.5
A
Carry Current
DC or peak AC
0.5
A
Static Contact Resistance
w/ 0.5V & 10mA
150
mΩ
Dynamic Contact Resistance
Measured w/ 0.5V & 50mA 1.5
ms after closure
200
mΩ
Insulation Resistance across Contacts
100 Volts applied
109
Ω
Breakdown Voltage across Contacts
Voltage applied for 60 sec. min.
230
VDC
Operate Time, incl. Bounce
Measured w/ 50% overdrive
0.6
ms
Release Time
Measured w/ no coil suppression
0.1
ms
Capacitance
@ 10kHz across contact
0.2
pF
Contact Operation *
Must Operate Condition
Steady state field
10
25
AT
Must Release Condition
Steady state field
4
22
AT
g
Environmental Data
Shock Resistance
1/2 sine wave duration 11ms
30
Vibration Resistance
From 10 - 2000 Hz
20
0
g
Ambient Temperature
10 C/ minute max. allowable
-20
70
0
Storage Temperature
10 0 C/ minute max. allowable
-20
70
0
C
Soldering Temperature
5 sec. dwell
260
0
C
C
Please note: The indicated electrical data are maximum values and can vary downwards when using a more
sensitive switch.
* These ranges refer to the uncut / unmodified Reed Switches described in our Reed Switch section. Consult factory
if more detail is required.
www.willow.co.uk
Tel. +44 (0) 1342 835234
Fax. +44 (0) 1342 834306