Who uses Keri Systems' Protech Detectors?

For many years Protech detectors have provided military, government, commercial, and industrial users the highest standard in intrusion sensors. These high quality sensors are the ideal solutions for your outdoor or hazardous requirements and should be a primary component in any alarm system.

Why are Protech Detectors "The Only Outdoor Detector That Really Work"?

The XL2 version of Protech Detectors provide reliable outdoor "volumetric" protection under even the most severe environmental conditions. The XL2 sensors have a very broad application range. The key to their success is the unique, dual-channel Stereo Doppler Microwave Detector and its ability to ignore randomly moving objects. The capability to field adjust the distance a target must move to create an alarm, enhances the sensor's adaptability to most environmental situations.

• Stereo Doppler Microwave Detector - Two receiving channels with the ability to eliminate vibration and periodically moving objects as sources of false alarms.





• Dual Element Infrared Detector - Ignores normal temperature variations yet is very responsive to rapid infrared changes created by an intruder.





• Balanced Temperature Compensation - Stereo Doppler Microwave and Passive Infrared portions automatically adjust detection parameters to compensate for losses in range that occur at elevated temperatures.





• Digital Range Control - Ten-position digital switch adjusts how far the sensor detects (to it's maximum range).





• Digital Sensitivity Control - Ten-position digital switch adjusts the amount of movement required to initiate an alarm condition.





• Enhanced Bird Immunity Control - Two-position switch adjusts the sensors immunity to birds and small animals.





• Master LED - Displayed on the face of the unit indicating the alarm relay status.





• Analytic LED's - Alarm and environmental caution LED's for both technologies displayed on the face of the sensor. An internal switch can disable both master and analytic LED's.





• Walk-test Sounder - Optional audible tester to assist in the walk-test and initial sensor setup. The XL-Sounder greatly simplifies the installation as it enables walk-testing and adjustment by a single installer.





• Swivel Mounting - 180° horizontal adjustment, 90° vertical adjustment.





• Tamper-proof - Tamper switch with terminal connection.





• All Solid State Relay - User selectable Form C relay output. A solid state relay is flexible, silent and more reliable than an electro-mechanical relay.





• Metal Raintight Housing - Rugged, weatherproof housing offers maximum protection against RFI and EMI interference.





• Weather Shroud - Metal hood that routes rain from sensor's face and also provides maximum protection from ice, snow, wind and sun loading.



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The SDI-76XL2 and SDI-77XL2 are dual technology sensors combining Protech's proprietary Stereo Doppler Microwave Technology with a dual element Passive Infrared sensor. The independent sensor modules are "And Gated" and must activate simultaneously to create an overall sensor alarm.

The available coverage patterns are as follows:

• SDI-76XL2      15m x 15m (w/Lens A)
• SDI-77XL2      27m x 15m (w/Lens A)
• SDI-77XL2-B   Medium 30m x 10.5m (w/Lens B)
• SDI-77XL2-C   Narrow 38m x 6m (w/Lens C)
• SDI-77XL2-D   30m x 1m Vertical Barrier


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The “LT” (Ladder and Tower) version is an Outdoor Dual Technology Motion sensor specifically designed to protect against intruders climbing up ladders and towers. The LT version features Protech's proprietary Stereo Doppler Microwave Technology combined with passive infrared. The sensor is configured so that both technologies must activate simultaneously for a sensor alarm. The direction control switch can be set to one of three detection modes:

• Approach Mode - Sensor detects only approaching targets
• Recede Mode - Sensor detects only receding targets
• Both Mode - Sensor detects both approaching and receding targets

For protecting ladders and towers The LT is generally mounted at the top of the structure looking downward. The direction control switch is set in the “Approach” mode so that the sensor detects only approaching targets, i.e. someone climbing up the ladder or structure, not debris or rain falling from above the sensor.

• SDI-77XL-DIR-LT - Ladder & Tower Detector
• PH-6 - Ladder Mounting Bracket

The SDI-77XL2-EX Model of Stereo Doppler was developed to protect hazardous locations due to the presence of flammable gasses or vapors, combustable 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.