Didactum Magnetic Contact Sensor
€29.00
Available, delivery time: 1-2 weeks
Reliable access control for server rooms and critical areas
The Didactum magnetic contact sensor reliably monitors whether doors, windows, garage doors, rack doors, server cabinets, and other enclosures are open or closed wherever magnetic access monitoring makes sense. It detects the separation of two magnetically connected parts, with one mounted on the door or window and the other on the frame.
The sensor can be connected to any potential-free input (dry contact) of a Didactum monitoring system and is also compatible with third-party controllers. As a simple basic element of an alarm system, the magnetic contact sensor does not require its own power supply.
Structure of the magnetic contact sensor
The sensor consists of two separate parts that together form a reed contact (potential-free normally open contact, SPST-NO).
Magnet (without cable)
Mounted on the moving door or window. Has no electrical connection.
Sensor element (with cable)
Mounted on the fixed door frame and connected to the monitoring system via a 1.2 m cable.
Reed contact
Opens or closes depending on the distance between the two parts, which is the basis for status detection.
Compact housing
Only 29 × 18.8 × 6.9 mm in size and suitable for humid environments thanks to IP68 protection.
Mounting the magnet and sensor element
Both parts are mounted opposite each other and must be aligned precisely.
- Attach the magnet (without cable) to the door or window using the supplied adhesive sticker or two screws.
- Attach the sensor element (with the two cable wires) to the door frame or window frame.
- Align both parts so that they face each other directly and point in the same direction.
- Set the distance between magnet and sensor element to a maximum of 8–10 mm.
Important note: The distance between magnet and sensor element must not exceed 8–10 mm, otherwise the reed contact will not switch reliably. Both parts must also be aligned correctly with each other.
Connection to the dry contact input
The two cable wires of the sensor element are connected to a 3.5 mm terminal block. Since this is a simple potential-free contact, the two wires can be swapped in any order, so polarity does not matter. The wired terminal block is then plugged into a free "Dry Contact Input" of the monitoring system.
The maximum distance between the sensor and the monitoring system or expansion unit is up to 500 m.
Normal and alarm state
When the door is closed, the magnet and sensor element are close together and the reed contact is closed, which corresponds to the factory-set normal state. When the door is opened, the magnet and sensor element move apart, the contact opens, and the sensor switches to the alarm state.
The output state defined as the normal state for the sensor (open or closed) can be reversed individually in the monitoring system web interface if the installation situation requires it.
What is included
Please check the scope of delivery for completeness upon receipt and report any missing or damaged parts to your supplier immediately.
- Sensor element with 1.2 m connection cable1 piece
- Magnet1 piece
- B2.9 × 16 mm screws4 pieces
- Adhesive stickers2 pieces
Application examples
- Server room monitoring: Control of all access points to server rooms and IT racks.
- Access control: Securing doors, windows, roller shutters, and control cabinets.
- Intrusion protection: Immediate alarm notification in the event of tampering or opening of sensitive access points.
- Rack and cabinet security: Monitoring of IT racks, server cabinets, and enclosures.
- Remote monitoring: Use at unmanned technical sites or branch locations.
- Integration into alarm systems: Compatible with Didactum and third-party controllers.
Why this magnetic contact sensor is the right choice
No power supply required
Passive reed contact, no separate power supply needed.
Simple wiring
Wires can be swapped in any order, no polarity to consider.
Long range
Up to 500 m distance from the monitoring system.
Robust and protected
IP68 protection, also suitable for harsh environments.
Flexible mounting
Can be attached using adhesive stickers or screws.
Third-party compatible
Can also be used with controllers from other manufacturers.
Compact design
Only 29 × 18.8 × 6.9 mm, allowing discreet installation.
Made in EU
Developed and manufactured in the European Union.
Frequently asked questions
What is the magnetic contact sensor made of?
The sensor consists of two parts: a magnet without an electrical connection, which is mounted on the door or window, and a sensor element with a 1.2 m connection cable, which is mounted on the frame and connected to the monitoring system.
How large may the distance between magnet and sensor element be?
The distance between the two parts may be a maximum of 8–10 mm so that the reed contact switches reliably. In addition, the magnet and sensor element must be aligned precisely with each other.
Do I need to pay attention to cable polarity when connecting it?
No. Since this is a simple potential-free contact, the two cable wires can be swapped in any order. The 3.5 mm pitch terminal block is then plugged into a free dry contact input of the monitoring system.
Which state is considered "normal" and which is "alarm"?
In the factory setting: door closed = contact closed = normal state; door open = contact open = alarm state. This output state can be reversed in the monitoring system web interface if required.
Does the sensor need its own power supply?
No. The magnetic contact sensor is a purely passive reed contact and does not require its own power supply. It is read exclusively via the potential-free input of the monitoring system.
Can the sensor also be used with controllers from other manufacturers?
Yes. The magnetic contact sensor provides a simple potential-free contact and can therefore also be connected to controllers and alarm systems from third-party providers.
Questions about the Didactum magnetic contact sensor?
Our support team in Germany provides free advice on installation, connection, and configuration.
Didactum Magnetic Contact Sensor
Function
- Magnetic contact sensor for monitoring openings
- Detects the opening of doors, windows, garage doors, rack doors, and enclosures
- Operates via separation of two magnetic contact parts
- Suitable for use in IT racks, server cabinets, and building security applications
- Connection to dry-contact inputs of a Didactum monitoring system or third-party controllers
- No additional power supply required
Sensor Technology
- Sensor type: Reed contact (potential-free contact)
- Contact type: SPST-NO (normally open)
Connections & Communication
- Connection type: connection cable
- Maximum distance: up to 500 m to the Didactum unit or expansion unit
Environmental Conditions
- Operating temperature: -10 °C to +50 °C
- Humidity: 5% to 95%
- Protection class: IP68
Mechanical Data
- Dimensions: 29 × 18.8 × 6.9 mm
- Cable length: 1.2 m
General
- Manufacturing: EU
- HS code: 8531 10 300
Can be used with monitoring unit:
Can be used with extension unit:
Manufacturer information:
Didactum® Security GmbH
Im Mühlenfeld 4
48163 Münster
Deutschland
Fon:
(+49) 250 19 71 63 54 / (+49) 171 33 11 577
Email: info@didactum-security.de
