When it needs for rapid fire detection in its early stages of formation is required, other spot sensors
are not used and,instead of waiting for smoke to reach the sensor, we use a point detector of air samplers.
Application of air sampler detectors ...
The use of these types of detectors is the server rooms, document centers, electrical control panels, and so on.
The plumbing system of these detectors in addition to the main roof can be drawn from inside ceilings and false floors,
or on racks and electrical panels, and even sometimes pass pipes through racks and electrical panels.
These detectors are used in a variety of different levels, and in total, depending on the manufacturer, it can cover up
to 80 square meters,up to 100 square meters, up to 150 square meters, up to 180 square meters, up to 250 square meters,
up to 500 square meters. ... and can be used for single-channel type, dual-channel, four-channel.
This detector has the ability to use in the conventional (conventional / traditional) system as well as the addressable system.
Of course, when installing them, we have to make sure that the standard of use is met.
For example, you should never use a knee or 90-degree interface to bend.
Mode of operation of air sampler detectors or smoke intake detector
The detector recognizes the presence of smoke that may be due to fire, based on the sampling of air in a given atmosphere.
A relatively small fan, one or two smoke detectors and an electronic board that performs processing and evaluation,
are the main components of this type of detector.
The vent inside the chamber draws air into the device via tube-shaped passages. The air passes through a filter after
entering the compartment and drives the path of smoke detectors to the outlet port. In-device detectors and processors measure
the air condition in terms of smoke concentration.
How to run
Air pipes run under the ceiling and have portions at the right distance to enter the air.
In air-conditioned and air-conditioned spaces, it is possible to sample through air returns instead of running under the ceiling.
The amount of space or room to be protected has a direct impact on the smoke's dilution or concentration, and thus the sensitivity of
Another factor in the concentration of smoke and sensitivity of the system is the amount of fresh air and compensatory.
The number of sampling pores placed at the top of the ceiling on the main tube is an important factor in determining
the sensitivity of the system, each sampling pore can be assumed to be a smoke detector, and then in spaces that are airy
or At very low speeds, porosity intervals can be considered as a 7.5 meter smoke detector.
This is while the width of the space is more than 5 meters. Under these circumstances, the sensitivity of the system
will be normal and normal.
In high-sensitivity systems, the venting intervals should be 3.5 meters and for a very high sensitivity of 2.5 meters.
In spaces where the air is in motion, for ordinary sensitivity it is considered 7.5 meters long, but for a high sensitivity
of 5 meters and for a very high sensitivity of 3.5 meters.
Of course, the manufacturing plants, based on the tests on their product, set the interval to consider the pores on the main branch,
which are the basis for installation and implementation.
Sensitivity of air sampling detectors
One of the advantages of this detector is the high sensitivity to the acceptable volume (protective space). So that's called HSSD
or High SensitivitySmoke Detector.
The degree of sensitivity of the air sampler detectors or the smoke intake detector is 3 levels.
In HSSD detectors, the sensitivity is expressed in terms of the volume occupancy rate by smoke in the detector chamber.
In other words, the percentage of laser light (scattering) in the chamber, when passing air (smoke) over a meter.
The unit of measurement or the percentage of darkness is per meter.
Obs/metter (persentage obscuration per-meter))
تعداد بازدید: 225