Area Of Application; General Features; Project Planning - Helios RMK Notice De Montage Et D'utilisation

Installation and Operating Instructions
EN
CHAPTER 2
AREA OF
APPLICATION
m
WARNING
Duct smoke detector – RMK
moisture indicators). The storage place must be waterproof, vibration-free and free of
excessive temperature variations. Damages due to improper transportation, storage or
commissioning must be verified and are not liable for warranty.

2.0 Area of application

The duct smoke detector RMK (with VdS approval) is used for the early detection of
combustion gas/smoke in a ventilation system. The duct smoke detector protects
against smoke intake by monitoring the supply air intake and it allows targeted system
deactivation to prevent smoke entry.
Application as a component of a fire alarm system is not intended!
2.1 Function
During operation, the smoke detector in connection with the ventilation duct base is
permanently flushed with the air flow in the monitored ventilation ducting. When smoke
particles are detected (smoke detection in the scattered light principle), an alarm is trig-
gered and held (self-holding alarm). The safety devices are triggered. Resetting takes
place when the duct is free of smoke by briefly interrupting the supply voltage. The
smoke detector states are quick and easy to ascertain through the transparent casing
cover of the duct smoke detector.

2.2 General features

The duct smoke detector consists of an optical smoke detector with a specially develo-
ped, automatic alarm threshold as contamination compensation for a long service life, an
aluminium inlet pipe and a ventilation duct base with vibration decoupling (Fig. 1).
Fig.1
Optical smoke detector
Transparent
cover

2.3 Project planning

The duct smoke detector is designed for use inside buildings in rectangular ventilation
ducts from 0.15 to 1 m. In case of round ducts, the use of Ø 0.2 to 1 m is possible. The
side detection area of the inlet pipe in the duct is approx. 500 mm.
The ventilation duct base must be placed so that safe smoke detection can be assumed.
Disruptive factors which affect the safe functioning of the duct smoke detector must be
excluded.
In order to guarantee smoke detection in larger ducts, multiple duct smoke detectors
must be provided. In this respect, the parameters of the ventilation ducting must be
taken into account.
Inlet pipe made of aluminium
2
Ventilation duct base