Detector opening magnetic alarm surface mounting no nc magnetic contact, ivory alarm detector alarm sensor switches magnetic doo

The 3920 is designed to be fixed to a door to detect opening. The casing has 3 terminals for connecting to an alarm.
The 3920 detects an opening of about 15mm.
Output on contact type

8,25 €

953 Items

Quantity
Discount
5
0,41 €
10
0,83 €
20
1,65 €
50
2,06 €
100
2,47 €
200
2,89 €
500
3,30 €
1000
3,71 €

3920

Description

Dimension contact 12x55x12mm . Dimension magnet 12x55x12mm . Weight 40gr

The 3920 is designed to be fixed to a door to detect opening. The casing has 3 terminals for connecting to an alarm.
The 3920 detects an opening of about 15mm.
Output on contact type NO/NC.

Operating principle of magnetic opening the NO (normally open) detector

Opening the detectors are used on or from the access to be protected.
Each sensor is composed of two parts: a sensing device on the frame and a magnet on the movable part.
When the magnet is away from the sensor, the contact thereof is open. The center receives no information opening door or window open, if the security system is activated, the alarm does not sound.

When the magnet approaches the contact, both the ILS blades are subjected to the magnetic field. Each blade behaves like a magnet. The flexible blade is deformed and comes in contact with the rigid blade. The electrical contact is established, the control unit receives information as a closure. In this case the alarm will be triggered.

These contacts must be connected in parallel with a normally open your plant or system area. Disadvantage the power cable will not trigger an alarm. Benefit: Does not require the use of a control panel. The opening NO detectors are very popular DIY.

There are two types of opening (NC and NO) detectors:

- Magnetic switch open NC (normally closed contact = no alarm, open alarm contact)

- Magnetic switch opening NO (normally open contact = no alarm, closed alarm contact)

In case you want to order one or more sensors magnetic opening NF, please visit our web site (ref. SC10N)

The opening SC10N detector is adapted to directly power a 12v or 220v siren.
As against the opening detector (ref. 3920) can be used with a small 12v siren and switch
.
Mounting rules magnetic contacts
The opening contacts consist of a magnet creating a magnetic field and a contact whose state is changed by the presence of this field.
In the air or on neutral materials (wood, aluminum, plâtreetc) the magnetic field evenly distributed around the magnet.
A near ferromagnetic material (steel, soft iron) the magnetic field of the magnet is fully attracted and captured by this material and is not in other directions.
Therefore, it is essential to remove enough magnets and magnetic media contacts using the specific spacing shims. To verify that a material is ferromagnetic or not, use the magnet contact. If there is attraction between the magnet material, it is ferromagnetic.

Reviews


Click here to leave a review




Accessories

30 other products in the same category:

Download