Magnetic perimeter detector SATEL B-21 BR recessed hermetic NC brown diameter 6.5 mm
- Hermetic magnetic (reed switch) detector B-21 BR for door and window opening detection, recessed mounting, NC type, contact closing distance 19 mm.
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B-21 BR hermetic magnetic flange detector for recessed mounting (brown)
B-21 BR is a hermetic reed detector designed for recessed mounting, used to detect the opening of doors, windows and other perimeter elements. The B-21 BR version is distinguished by its brown color scheme and the presence of a magnet holder for easy installation in hard-to-reach places.
- Hermetic magnetic (reed) detector for perimeter protection
- Designed for recessed mounting
- Brown color version (B-21 BR)
- Medium-sized housing with square flange
- Magnet bracket included for installation in hard-to-reach places
Application and purpose of use
The B-21 BR magnetic detector is used to signal the opening of elements such as doors or windows in burglary and assault alarm systems. Recessed mounting allows the reed switch element to be discreetly placed in the structure of the protected object, which increases the aesthetics of the installation and reduces the possibility of accidental damage.
The B-21 BR model is a bronze version of the B-21 detector, which makes it easier to use in places where a color match to the door or window woodwork is desired. Thanks to its hermetic housing, the device can operate in a wide range of environmental conditions, in accordance with environmental class II according to EN50130-5.
Design and mechanical features
The B-21 BR has a medium-sized hermetic housing with a square flange, suitable for recessed mounting in the ground. The diameter of the housing is 6.5 mm, and the flange has a side length of 10 mm, which facilitates precise installation and aesthetic finishing of the mounting hole.
A magnet holder is included, which facilitates installation in hard-to-reach places and ensures proper alignment of the magnet with the reed switch. The reed switch housing measures 26 x 10 x 10 mm, while the magnet housing measures 19 x 7.6 mm, which allows the detector to be used in typical door and window profiles. The cable length is 450 mm, which gives flexibility when connecting to an alarm system control panel or module.
Electrical and environmental parameters
The B-21 BR detector is an NC (normally closed) type detector, the operation of which is based on changing the state of the reed switch contacts under the influence of a magnetic field. The closing distance of the contacts is 19 mm, while their opening distance is 24 mm, which defines the permissible clearance between the magnetic element and the reed switch at installation.
The device features a maximum switching voltage of 100 V, a maximum load power of 10 W, a maximum switching current of 500 µA and a maximum contact resistance of 200 Ω. The detector can operate in the temperature range from -10 to +55 °C, with a maximum humidity of 93±3%, which corresponds to environmental class II according to EN50130-5. The weight of the device is 13 g.
Technical data
| Parameter | Value |
|---|---|
| Device type | Hermetic magnetic (reed) detector B-21 BR |
| Purpose | Perimeter protection detector for signaling the opening of doors, windows, etc. |
| Mounting type | Recessed mounting |
| Color version | Brown (B-21 BR) |
| Housing | Medium size, hermetic, with square flange |
| Housing diameter | 6.5 mm |
| Flange dimensions | Flange with a side of 10 mm |
| Dimensions of the reed switch housing | 26 x 10 x 10 mm |
| Magnet housing dimensions | 19 x 7.6 mm |
| Dimensions of magnet holder | 55 x 12.6 x 19.8 mm |
| Detector type | NC |
| Contact closure distance of reed relay | 19 mm |
| Reed relay contact opening distance | 24 mm |
| Maximum switchable voltage | 100 V |
| Maximum load power | 10 W |
| Maximum switchable current | 500 µA |
| Maximum contact resistance | 200 Ω |
| Operating temperature range | -10...+55 °C |
| Maximum humidity | 93±3% |
| Environmental class according to EN50130-5 | II |
| Cable length | 450 mm |
| Weight | 13 g |
Technical data source:data sheet of model B-21 BR Link
FAQ - Frequently Asked Questions
1. What is the B-21 BR detector used for?
The B-21 BR is used to detect the opening of doors, windows and other perimeter elements in burglar alarm systems.
2. What type of detector is the B-21 BR?
It is a magnetic (reed) detector of NC type, i.e. normally closed.
3. How is the B-21 BR detector installed?
The detector is designed for recessed mounting, which means placing the elements in prepared holes in the door, door frame or window frame.
4. Does the B-21 BR come with a magnet holder included?
Yes, a magnet holder is included with the detector for easy installation in hard-to-reach places.
5. What is the difference between the B-21 BR and the B-21?
The B-21 BR is a brown color version of the B-21 detector, which is available in white.
6. What is the operating temperature range of the detector?
The B-21 BR detector operates in a temperature range of -10 to +55 °C.
7. What is the maximum operating humidity allowed by the manufacturer?
The maximum operating humidity of the detector is 93±3%.
8. What are the dimensions of the reed switch housing?
The reed switch housing has dimensions of 26 x 10 x 10 mm.
9. What are the dimensions of the magnet housing?
The magnet housing has dimensions of 19 x 7.6 mm.
10. What is the length of the wires coming out of the detector?
The length of the wires is 450 mm.
11. What is the maximum switching voltage of the contacts?
The maximum switching voltage is 100 V.
12. What is the maximum load power of the contacts?
The maximum load power is 10 watts.
13. What is the maximum switchable current?
The maximum switching current of the detector contacts is 500 µA.
14. What is the maximum contact resistance?
The maximum contact resistance of the B-21 BR detector is 200 Ω.
15. What distances apply to the tripping of the reed switch?
The closing distance of the reed switch contacts is 19 mm, and the opening distance is 24 mm.
16. What environmental class according to EN50130-5 does the detector belong to?
The B-21 BR detector belongs to environmental class II according to EN50130-5.
17. What is the weight of the B-21 BR detector?
The weight of the detector is 13 g.
18. What are the dimensions of the magnet holder?
The magnet holder has dimensions of 55 x 12.6 x 19.8 mm.
B-21 BR is a hermetic NC-type magnetic detector designed for recessed mounting in intrusion alarm systems. The device is characterized by certain electrical and environmental parameters, which allows it to be used in a wide range of conditions expLoatation.