Bosch DS939 Classic Series — 360° Ceiling PIR, 21m Pattern

The longest-reaching passive infrared ceiling detector in the Classic Series: a 360° pattern out to 21m across, from a mount between 3m and 7.6m. Rated -40°C to 49°C and drawing 12–39mA, it is built for the kind of large unconditioned space that would otherwise need several detectors.

Key Details

• 21m diameter coverage — A 10.5m radius circle from one ceiling position — the largest single-detector footprint in the range.
• Mounts up to 7.6m — Rated to 7.6m with 6.1m recommended, so it suits genuine warehouse roof heights.
• Wide temperature tolerance — -40°C to 49°C for cool rooms, sheds and buildings with no climate control.
• SPDT alarm and N/C tamper — Separate contacts so the panel distinguishes a detection from an interference with the housing.
• 178mm low-profile housing — A 178mm diameter, 89mm deep body that sits unobtrusively on an exposed ceiling.

Where It Fits

Large single-volume spaces — warehouses, sheds, halls — where the goal is broad coverage of an open floor. In a space subdivided by racking or partitions, several shorter-range detectors will out-perform one long one.

Technical Specifications

Assurance

• 3-Year Australian Warranty
• Genuine Bosch stock, supplied and supported locally
• Australian-based technical support before and after purchase