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Protech USA PIRAMID Intrusion Detection Explosion Proof Motion Sensors. Proven Stereo Doppler Microwave Technology.

Explosion Proof motion sensor with stereo doppler microwave technology was developed to protect hazardous locations due to the presence of flammable gasses or vapours



The SDI-77XL2-EX Model of Stereo Doppler Explosion Proof Motion 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

explosion proof intrusion detection sensor electronic assembly is configured to be easily inserted into a special explosion proof motion sensor enclosure. The unit is suitable for applications in Hazardous Locations under the following classifications:explosion proof motion sensor

  • Class I, Div. 1 & 2, Groups C,D
  • Class II, Div. 1 & 2, Groups E,F,G
  • Class III
  • NEMA 7CD, 9EFG

The explosion proof motion sensor 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).

  • Stereo Doppler Microwave Detector: Two receiving channels with the ability to eliminate vibration and periodically moving objects as sources of false alarms.
  • Microprocessor controlled: Proprietary integrated circuit design that provides enhanced digital signal processing for microwave sensor.
  • Stereo Doppler Supervision: A component or power failure will cause the sensor to lock-in alarm.
  • Digital Range Control: Ten-position digital switch adjusts the overall size of the sensor’s detection area (to its maximum range).
  • Digital Sensitivity Control: Ten-position digital switch adjusts the amount of movement required to initiate an alarm condition.
  • Enhanced Bird/Animal Immunity Control: Two-position switch adjusts the sensor’s immunity to birds and small animals.
  • Tamper: Housing tamper with terminal connection.
  • Solid State Relay: User selectable form C relay output. A Solid State relay is flexible, silent, and more reliable than an electromechanical relay.
  • Walk-Test Sounder: Optional audible tester to assist in the walk-test and initial sensor set-up. The XL-Minisounder greatly simplifies the installation as it enables walk-testing and adjustment by a single installer.


Input voltage10-28 VDC (Also available in 24DC or 24A)
Consumption150 mA @ 12 Vdc (LED OFF)
RF power density120 uW/cm² max. at the face of the unit
Weight40 lbs. (12 kg)
Operating temperature-31°F to +158°F (-35°C to +70°C)
IP ratingIP66 compliant with EN 60529 and IEC 60529 Mechanical resistance IK10 compliant with EN 50102
Relay contact rating0,1 A / 50 V
Microwave frequencyFactory adjusted to one of the following frequencies : 10,525 MHz USA 10,587 MHz International 9,900 MHz International 9,470 MHz International
Electric accessHousing provided with NPT 1/2” pipe thread and cable gland adapted to non-armored cables. Diameter 2 mm to 9 mm. Special hole size, location and thread options available upon request.



PIRAMID EX Installation Guide (1,6 MB)