Alarmtech MC 346 Manuale utente
MC 346 Instruction Manual 4-MC346-01
© 2018 Alarmtech Rev. MC346_2046en Page 1of 2
Detectors
Magnetic Contact
Recessed mounting
Instruction Manual MC 346
DESCRIPTION
MC 346 is a versatile magnetic contact used in both alarm
and security access control systems for protection of doors,
gates and windows against unauthorized opening. A wide
range of accessories enables the contact to be recessed- or
surface-mounted on a variety of surfaces, including
ferromagnetic materials.
MOUNTING INSTRUCTIONS
Contact and magnet should be installed axially,
corresponding to each other.
Catch-bolts on the housing enable direct installation in
ф8 mm holes in wood.
Appropriate accessory must be used for installation in
ferromagnetic environment.
CIRCUIT DIAGRAM
OPERATING PRINCIPLE
MC 346 magnetic contact has two parts: the contact part
with a reed switch and the 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
causes a change in position of the reed switch and as a result
–a path of the signal.
Magnetic contacts should not be installed in the vicinity of
strong magnetic fields.
TECHNICAL DATA
Working environment
Wood
Steel
Make distance
typ. 15 mm ± 40%
Not recommended
Break distance
typ. 17 mm ± 40%
Not recommended
Contact type
form C, SPDT
Switching voltage max.
48 V DC/AC
Switching current max.
250 mA DC / 180mA AC
Contact rating max.
5 W
Environmental class (EN50130-5:2011)
IIIA
Cable
ф 3,6 mm, 5x0,182 mm2
Operating temperature range
-40°C to +70°C
Operating humidity range
max. 95% r. h.
Housing material
plastic ABS
Dimensions:
Contact part
ф 9 x 36 mm
Magnet part
ф 9 x 25,5 mm
Security grade (EN50131-2-6:2008)
2
MC 346 Instruction Manual 4-MC346-01
© 2018 Alarmtech Rev. MC346_2046en Page 2of 2
INSTALLATION
Contact and magnet should be aligned axially in the frames
and leaves of the monitored objects (windows, doors etc.).
Offset will reduce the working distances. The contact should
be mounted in the stationary part of the monitored object
(ex. door frame) and the magnet in the movable part (ex.
door leaf). Before mounting, holes must be drilled. Catch-
bolts on the housing enable direct installation in ф8 mm
holes in wood.
For sites where it is impossible to mount the contact
directly, a variety of accessories is available.
Accessories with a strong magnet provide a bigger working
distance for more demanding applications and maintain the
parameters of the magnetic contact when mounted in
ferromagnetic environment.
Accessories for surface mounted applications provide
installation solutions for sites where recessed mounting is
not suitable.
The working distances of the magnetic contact will be
decreased in the proximity of ferromagnetic surfaces. The
closer the contact/magnet is installed to the ferromagnetic
surface, the lower the working distances
Only non-ferromagnetic screws may be used when mounting
the contact using accessories.
After the installation, use an ohmmeter to check the
electrical connections and test the function of the magnetic
contact.
Please note:
Applying excessive force to the housing of the contact may
damage the glass body of the reed switches inside.
Applying excessive force to the magnet can have a negative
impact on the magnetic field.
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