Ceiling mount intrusion detector from Detection Systems

Product Profile

With its 25-foot mounting height and 360° coverage, the DS939 is the ideal security tool for a wide variety of applications, including:
  • Retail and Department Stores
  • Banks and Financial Institutions
  • Manufacturing Facilities
  • Automobile Dealerships
  • Schools Colleges and Universities
  • Offices
  • Atriums
  • Warehouses
  • Gymnasiums


The DS939 also features three independent PIRs, which can be individually adjusted for customised coverage.  Providing standard floor coverage, or to monitor the main floor plus an elevated loft area at the same time.

You can also focus the detector for pinpoint coverage of areas such as cash registers, jewellery counters and more. 

First Step Processing helps reduce false alarms from background, environmental sources.  The DS939 provides efficient performance while reducing costs.

Precise pattern control, reduced false alarms, excellent catch performance and an unparalleled 25-foot mounting height .
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Technical Specification

Make Bosch
Manufacturer Bosch Security Systems
Model code DS939
PIR Detectors Yes
Coverage/ Range m 21
Angle of Detection o 360
Vertical Coverage 7.6
Selectable Pulse Count Yes
Wall/Ceiling Mount Ceiling Mount
Electrical Specifications Power Supply: 9 ~ 15 V DC
Physical Specifications Dimensions mm: 89 x 178
Environmental Specifications Operating Temp oC: -40 ~ +49
Power Consumption 39 mA
Additional info

The ceiling mount DS939 PIR Detector provides a 21 m (70 ft) panoramic coverage pattern and can be used on ceilings as high as 7.6 m (25 ft).  With three separate PIR sections that are fully adjustable, the DS939 provides coverage integrity at all mounting heights, plus the ability to customize the coverage for specific areas.  The DS939 uses several patented processing techniques to provide excellent catch performance with freedom from false alarms.

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