MK8 Series

Oil resistant Reed Sensor with Ex approval according to EEx m II T6

Characteristics

MK8 are magnetically operated Reed proximity switches supplied with oil resistant cable. The sensor should be mounted on a fixed surface with the actuating magnet on the moving surface.  Approximation resp. removal of the magnet determines the closing or opening of the Reed Switch.  The magnetic pull-in / drop-out sensitivity is divided into six AT ranges.

Applications

Position and limit switch, e.g. pneumatic or hydraulic actuator position indications and end travel limit switch

Impulse or revolution sensing, e.g. for all kind of meters

Petrochemical applications, Ex approved, usable in every location and hazardous areas

Cold-resistant, fitted with a  rubber-sheathed cable the sensor is suitable for se at -40o C and in outdoor applications

Dimensions

Tolerance +/- 0.10mm (0.004 inch)

Dimension Drawing

Termination

The standard termination is an up to -40° C cold-resistant rubber-sheathed cable with a cross section of 2 x 0.75mm². The standard length of the cable is 500mm, other lengths can be supplied on request. The required length has to be stated in 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 5mm(0.2inch) 
X Individual crimped terminals
Y Individual, fully insulated spade terminals, 6.3 x 0.8mm

Contact Data

Contact type 74 76
Contact form A/dry A/dry
Rated Power max. (W) 301 60
Switching voltage max.   200 VDC / 250 VAC 400 VDC / 300 VAC
Switching current max. (A) 0.752 3.0
Carry current (A) 2.03 6.0
Contact resistance max. mOhm 120 150
Breakdown voltage (contact/contact) min. (VDC) 3504 600 VDC / 500 VAC
Operating time incl. bounce (ms) 0.5 2.5
Releasing time (ms) 0.1 0.2
Operating temperature (°C) -40/+130 -40/+130
Storing temperature (°C) -40/+130 -40/+130

1Range > N: 40 W  2Range > M: 1.0 A  3Range  M: 2.0 A; Range > N: 3.0 A  4Range  M: 500 VDC; Range > N: 600 VDC

Other switches by request.

Magnetic Sensitivity

Sensitivity class L M N O P Q
Pull-in AT range 10-20 20-30 30-40 40-50 50-60 60-70
Available switches 74 74/76

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

MK8 – 1A74 N – 500 W

MK8 Reed Sensor, 1 form A switch type 74, Sensitivity class N, Cable length 500mm, Termination W

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