The Doppler detector uses a microwave transmitter and receiver antenna that transmit a pulse and analyze the signal reflected from the environment. Frequency differences between the transmitted signal and the received signal provide information about moving objects in the detection area.

PIRAMID detectors are very easy to set up. Via a secure application on smartphone or tablet, if the detector is difficult to access, the setting can be done locally, wirelessly.
The embedded CONNECT technology makes it possible to put several PIRAMID detectors in radio or wired network to centralize the alarm information on the MAXIBUS UNIVERSAL.

It is also possible to retrieve the alarm information thanks to the on-board dry contact outputs.

PIRAMID ATEX is compliant with the Standard ATEX 94/9 EC – EN 50014 -18. This product assures the protection of hazardous locations due to the presence of flammable gasses or vapours, combustible dusts, easily ignitable fibres or flying sparks.

PIRAMID ATEX is equipped with a Stereo Doppler Microwave Detector: Two receiving channels with the ability to eliminate vibration and periodically moving objects as sources of unwanted alarms.

Dual technology detectors combine a passive infrared (PIR) sensor with a Doppler microwave sensor. SORHEA has combined these two technologies to develop reliable detection solutions.

Passive infrared detection is based on an analysis of the temperature emitted in the monitored area. Indeed, an intruder has a body temperature that strongly contrasts with the rest of the environment. The microwave antenna consists of a 10,5 GHz transmitter (in K-band) and a Doppler receiver, which detects the signal variations caused by the passage of an object in the lobe. The combination of these two technologies provides a reliable and powerful solution by forming an immaterial curtain of detection or an immaterial lobe (depending on the sensor model).

If each technology can be sensitive to certain disturbances (sensitivity of the PIR to the reflection of the heat and the Doppler to the movements of the water), the combination of the two becomes effective since the advantages of each technology cancel the disadvantages of the other. To trigger an alarm, both technologies must detect an intrusion.

The SDI-77XL2-EX Model of Stereo Doppler Motion Detection Sensor was developed to protect Hazardous Locations due to the presence of flammable gasses or vapors, combustible dusts or easily ignitable fibers or flyings.

The SDI-77XL2-EX electronic assembly is configured to be easily inserted into a special explosion-proof enclosure. The unit is suitable for applications in Hazardous Locations under the following classifications:

Class I, Div. 1 & 2, Groups C,D
Class II, Div. 1 & 2, Groups E,F,G
Class III
NEMA 7CD, 9EFG
The unit is suitable for installations at petroleum refineries, chemical and petrochemical plants, storage areas and other processing facilities where hazardous substances are handled or stored.

The high-frequency antenna comprises a 24 GHz frequency transmitter (in K band) and a receiver with Doppler effect which detects signal variations caused by the passage of an object in the lobe. The association of these two technologies produces a reliable and high-performance solution by forming a non-physical light curtain or lobe (depending on sensor model).

Please click for the Pyramid Brochure.

Please click for the Pyramid Atex Brochure.