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. Resistant 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 • Designed for high temperature up to 160 oC (molded version) • Four operate sensitivities available • A choice of cable terminations and lengths are available • Molded and potted versions available DIMENSIONS All dimensions in mm [inches] www.meder.com 228 Europe # ++49-(0)7733-94870, USA # 800-870-5385 MK21 Series MEDER electronic Reed Sensors with Mounting Holes for Screw Fastening ORDER INFORMATION Part Number Example Series Contactform Switch Model Magnetic Sensitivity Cable Length (mm) Termination MK21X - XX XX X- XXX W 66 B, C, D, E 84 C, D, E 90 C, D, E 1 Form A Options 1 Form B“* 1 Form C** MK21M - 1A66 C - 500 MK21P - 1A66 C - 500 W W M = molded P = potted 500* 66 is the switch model C is the magnetic sensitivity 500 is the cable length (mm) * Other cable lengths available ** Potted version MAGNETIC SENSITIVITY Sensitivity Class Pull IN At Range B 10 - 15 C 15 - 25 D 20 - 25 E 25 - 30 TERMINATION For wire and termination details, as well as other magnetic sensitivity classes please contact factory. W The cable cut length includes: 5 mm of wire stripped and tinned. www.meder.com Europe # ++49-(0)7733-94870, USA # 800-870-5385 229 MEDER electronic MK21 Series Reed Sensors with Mounting Holes for Screw Fastening CONTACT DATA Switch Model --> Contact Form --> All Data at 20° C Contact Ratings Conditions Switch 66 Form A Switch 84 Form A Switch 90 Form B/C, potted Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Units Switching Power Any DC combination of V & A not to exceed their individual max.‘s 10 10 3 W Switching Voltage DC or peak AC 200 400 175 V Switching Current DC or peak AC 0.5 0.5 0.25 A Carry Current DC or peak AC 1.25 1.0 1.2 A Static Contact Resistance w/ 0.5 V & 10 mA 150 150 150 mΩ Dynamic Contact Resistance Measured w/ 0.5 V & 50 mA , 1.5 ms after closure 200 200 250 mΩ Insulation Resistance across 100 volts applied Contact 1010* 1011 109 Ω Breakdown Voltage across Contact 225* 700 200 VDC Voltage applied for 60 sec. min. Operation Time incl. Bounce Measured w/ 100 % overdrive Release Time Measured w/ no coil suppression Capacitance at 10 kHz cross contact 0.5 2.0 0.7 ms 0.1 0.1 1.5 ms 0.2 0.7 pF Environmental Data Shock Resistance 1/2 sinus wave duration 11 ms 50 50 50 Vibration Resistance From 10 - 2000 Hz 20 20 20 g g Ambient Temperature M 10°C/ minute max. allowable -30 150** -30 150 -20 Ambient Temperature P 10°C/ minute max. allowable -20 85 -20 85 -35 Stock Temperature 10°C/ minute max. allowable -40 160 -40 160 85 o C Soldering Temperature 5 sec. 260 260 o C 260 o C 85 o C Please note: The indicated electrical data are maximum values and can vary downwards when using a more sensitive switch. * Insulation resistance of 1012 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. www.meder.com 230 Europe # ++49-(0)7733-94870, USA # 800-870-5385