Alarmtech MC 255 User manual

MC 255 Instruction Manual 4-MC255-01
©2014 Alarmtech Rev. MC255_1427en Page 1of 2
Detectors
Magnetic Contact
Recessed mounting
Instruction Manual MC 255
DESCRIPTION
MC 255 is a versatile magnetic contact used in both alarm
and security access control systems for protection of doors,
gates and windows against unauthorised opening. The
magnetic contact is designed to be mounted in places with
limited space. The construction of the contact enables
rotation during mounting, thus protecting the cable from
mechanical stress. A wide range of accessories enables the
contact to be installed on a variety of surfaces, including
ferromagnetic materials.
MC 255 is certified according to EN 50131-2-6:2008.
MOUNTING INSTRUCTIONS
Contact and magnet should be installed axially,
corresponding to each other.
Self-cutting and self-locking thread enables direct
installation in ф10 mm holes in wood and plastic.
Appropriate accessory must be used for installation in
ferromagnetic environment.
CIRCUIT DIAGRAM
DISTANCE DIAGRAM - WOOD
TECHNICAL DATA
Working environment
Wood
Steel
Make distance
typ. 20 mm +/–40 %
see distance table
Break distance
typ. 22 mm +/–40 %
see distance table
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
Estimated life expectancy
>20 million switching operations at 10 V/4 mA
Cable
2 m, ф 3,2 mm, 4x0,14 mm2
Environmental class (EN50130-5:2011)
IIIA
Operating temperature range
-40°C to +55°C
Operating humidity range
max. 95% r. h.
Housing material
aluminium alloy
Dimensions:
Contact part
ф 11 x 22 mm
Magnet part
ф 11 x 22 mm
Security grade (EN50131-2-6:2008)
2
Approvals
ITR 2/2014
0
5
10
15
20
25
-30 -20 -10 0 10 20 30
y [mm]
x [mm]
Make distance Break distance

MC 255 Instruction Manual 4-MC255-01
©2014 Alarmtech Rev. MC255_1427en Page 2of 2
OPERATING PRINCIPLE
MC 255 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
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.
INSTALLATION
Detailed installation instructions can be found in MC 255
Installer Manual.
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. The self-
cutting and self-locking thread of the housing enables easy
and reliable installation in ф10 mm holes in wood and
plastic.
The construction of the contact enables rotation during
mounting, thus protecting the cable from mechanical stress.
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.
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.
Warning: applying excessive force to the housing of the
contact may damage the glass body of the reed switches
inside.
Warning: appropriate accessories must be used for
installation in ferromagnetic environment.
RESISTORS (OPTIONAL)
MC 255 is available in two additional options with resistors
of the chosen value: MC 255-R with one resistor parallel to
the alarm switch and MC 255-2R with two resistors in 2EOL
configuration
DISTANCE TABLE
Contact
Accessory
Distance on wood [mm]
Distance on steel [mm]
Make
Break
Make
Break
MC 255
-
20
22
X
X
MC 200-S11
20
22
11
12
MC 200-S12
25
26
15
16
MC 200-S21
20
22
14
15
MC 200-S22
25
26
19
20
MC 200-S31
20
22
11
12
MC 200-S32
25
26
15
16
X –not recommended
ORDERING INFORMATION
Type
E-no.
Description
MC 255
6332894
Magnetic contact with rotating cable, 2m cable
MC 255-6
6332895
Magnetic contact with rotating cable, 6m cable
MC 255-10
6332896
Magnetic contact with rotating cable, 10m cable
We reserve the right to changes without notice.We reserve the right to changes without notice.