Siemens Base for FDF241-9 Flame Detector, M20 Cable Entry FDFB291

Overview

Like most fire detectors, a flame detector is fitted in two parts. The base is fixed and wired first, and the detector head plugs onto it later.

This Siemens base is the fixed part for the FDF241-9. All of the line wiring ends here, and the detector joins it with a pluggable connection.

Where to use it

Wherever an FDF241-9 is installed, it needs this base, fixed on a bracket or directly on a stable, vibration-free surface.

In damp and/or corrosive environments, fit the M20 x 1.5 metal cable gland, because device function is impaired without it.

Installing it

• Accessories first: if needed, fit the MV1 bracket for 45°, the MWV1 ball and socket joint for accurate aiming, or the DFZ1190 rain hood for outdoor applications.
• Cable entry: break open only the openings you require, then fit glands as needed.
• Terminals: use a screwdriver to remove the load from the spring clip, slide in the wire, and fit only one wire per terminal.
• Line layout: on FDnet/C-NET, loops, stubs and T-branches are possible.
• Indicators: wire-saving circuitry in external alarm indicators is prohibited for new sites.

Planning your system

Each flame detector needs one base, plus a bracket, joint or rain hood where the position calls for it. Fire-resistant cable is the usual choice for fire alarm circuits.

Flame detection normally forms one part of a fire alarm system that also covers smoke and heat. The commercial fire alarm guide explains how addressable and conventional systems differ.

As a rule, have a competent person design, install and commission changes to a fire alarm system.