Alarmtech MC 740-E-M14 User manual

MC 740-E-M14 Instruction Manual 4-MC740-E-M14-01
© 2021 Alarmtech Rev. MC740-E-M14_2121en Page 1of 2
Detectors
Magnetic Contact
Surface mounting
Instruction Manual MC 740-E-M14
DESCRIPTION
MC 740-E-M14 is a surface mounted magnetic contact used
in both alarm and security access control systems for
protection of doors and windows against unauthorised
opening. The magnetic contact is designed to be mounted in
places with limited space. The magnet part is easy to mount
with supplied rivet or screw.
CIRCUIT DIAGRAM
OPERATING PRINCIPLE
MC 740-E-M14 magnetic contact has two parts: the contact
part with a reed switch and the ring magnet part. In its
neutral position the reed switch remains closed under the
force of the magnetic field. Opening the monitored object
increases the distance between the reed switch and the
magnet. This reduces the influence of the magnetic field on
the reed switch until it opens and activates an alarm.
Magnetic contacts should not be installed in the vicinity of
strong magnetic fields.
TECHNICAL DATA
Working environment
Wood
Steel
Make distance
typ. 25 mm
not recommended
Break distance
typ. 28 mm
not recommended
Contact type
form A, SPST
Switching voltage max.
48 V DC/AC
Switching current max.
500 mA DC/peak AC
Contact rating max.
10 W
Cable
ф 3,4 mm, 4x0,182 mm2
Operating temperature range
-40°C to +70°C
Operating humidity
max. 95% RH
Housing material
plastic ABS
Dimensions:
Contact part
60 x 5 x 13,5 mm
Magnet part
Ф14 x 3,5 mm

MC 740-E-M14 Instruction Manual 4-MC740-E-M14-01
© 2021 Alarmtech Rev. MC740-E-M14_2121en Page 2of 2
INSTALLATION
Depending on the application, contact and magnet should
be installed in either front-to-front or side-to-front
configuration. Installation drawings show the correct
positioning of the contact parts. The contact should be
mounted on the stationary part of the monitored object (ex.
door frame) and the magnet on the movable part (ex. door
leaf, roller-shutter).
During installation of contact part in window or door frame,
it is advised to leave additional cable loop for about 10cm
long.
After the installation, use an ohmmeter to check the
electrical connections and test the operation of the
magnetic contact.
Warning: applying excessive force to the housing of the
contact may damage the glass body of the reed switches
inside.
Warning: installation in ferromagnetic environment is not
recommended.
INSTALLATION DRAWINGS
Correct positioning of side cable inlets ensure the maximum
working distances.
MC 740-E-M14 in front to front configuration
MC 740-E-M14 in side to front configuration
We reserve the right to changes without notice.