Installation of vesda

A VESDA System Installation can be used as pretty much anywhere but over the years we have found it to be most useful for the following settings:. Just like a standard fire alarm system regular maintenance of a VESDA system is required throughout the year as part of a fire alarm maintenance package. Testing airflow levels, backup battery supplies and cleaning the aspirating pipe is all part of an effective maintenance package. You can find out more about the fire alarm maintenance services we offer here.

From design to installation, commissioning and handover PHF Fire can deliver a high standard of service and ensure you get the VESDA System that effectively protects your building and the people inside it. A VESDA System Installation can be used as pretty much anywhere but over the years we have found it to be most useful for the following settings: Warehouses where we can install the VESDA system at high level to ensure complete coverage. Large ceiling void areas with good access.

This sampling system uses air sampling holes to monitor specific equipment in an open space. The volume of concentration is less in this type of sampling. The ASD monitors the air used in equipment cooling. ASD monitoring systems should be analyzed and reviewed by well-trained engineers. They should have a piece of sound knowledge in smoke detection systems. The main factors affecting the sensitivity of ASD systems are the number of sampling holes drilled in the piping network and smoke detection thresholds.

The dilution of the air coming into the sensing chamber depends on the number of sampling holes drilled in the piping network. When a cloud of smoke is drawn into a single sample hole which results in the dilution of smoke concentration due to the passage of smoke through other sampling holes aspirating clean air.

When the volume of clean air is mixed with smoke-filled air in the detection chamber the smoke-filled air is diluted.

When the smoke is transported through the pipe, it combines with clear air, thus diluting the smoke density. The dilution effect is directly linked with the number of sampling holes in the piping network. The more sampling holes, the more volume of air is sent to ASD and that results in dilution of smoke in the air.

While setting an alarm for the smoke detection system, the dilution effect needs to be considered. Experimentation is done by creating a smoke near one of the sampling holes.

The same amount of air will be let in through all the sampling holes. At the one end of the pipe, there is a smoke source, which prevents any other smoke to enter in any of the sampling holes. Issues that are affecting the dilution effect is the number of sampling holes, the number of bends, elbows, and fittings used in the piping system.

The transport time is the time taken for the smoke to reach the sensing chamber. The time measured in seconds for the particles to reach the sensing chamber from the sensing point.

When discussing transport times, various factors are taken into consideration. Hope you got an idea after reading the blog until the end. Select Course H. Follow Us On for updates. Enquire Now. Principles Of Aspirating Sample Detection A central detection unit in the aspirating smoke detection system, which helps to bring air from the pipes and detects smoke. The aspirating detector consists of Sampling pipe network which can gather air through sampling holes and send it to the detector.

Aspirating smoke detector: It consists of a sensing chamber having a highly sensitive sensor to detect even the micro smoke particle. A fan is installed to draw air from a protected area to the sensing chamber.

Optical fiber to remove large particles from entering the sensing chamber. Exhaust pipe to remove the sampled air from the detector. Aspirating Detection System Piping The Aspirating smoke detector is connected with a sampling piping network through the port from the top or bottom. Aspirating Smoke Detector Aspirating smoke detection systems can be classified according to the type of detection technology Laser-based systems filtered : This system works on laser technology.

The air passes through the filter to remove all large particles and the filtered air passes in front of the laser. A photo collector is used to sense the light scatter caused by smoke.

The detectors can analyze the quality of smoke detectors. Non-filtered laser-based systems: This method purely uses a laser detection system. Here the air is passed to the sensing chamber without passing through the filter.

The photo collector counts the number of micro air particles and it can differentiate between dust particles and smoke particles. Cloud chamber: The Cloud chamber system is one of the oldest sensing technologies. Here the sensing element inside a sealed chamber. The sealed chamber is filled up with high dense water vapor. Once the interaction takes place between smoked particles and vapor, the area gets ionized.

This will result in a condensation process around a nucleus. The particles change their size from below the wavelength of light to a size above the wavelength of light. Dual Source Sensor: This consists of a Blue LED to detect smoke particles which are very low in concentration and infrared lasers to check for dust particles and eliminate false alarms. The inbuilt advanced algorithm interprets signals and distinguishes between smoke and dust particles. Aspirating Smoke Detector Exhaust Systems In a normal operating cycle, the pressure in the air pressure-protected space should be the same as the air pressure in the space where ASD is mounted.

Primary Sampling The primary sampling method is mainly configured to sample the air where the flow is more. Secondary Sampling The secondary sampling requires holes in the ceiling level to check the airflow. Localised Sampling These sampling techniques are used in open space. In-Cabinet Sampling This sampling system uses air sampling holes to monitor specific equipment in an open space. Transport time The transport time is the time taken for the smoke to reach the sensing chamber.

Number of sampling holes The aspirator speed setting rpm Sensitivity setting of the detector Total qty of sampling pipe. Get a Call Back If you need to speak to us about a general query fill in the form below and we will call you back within the same day.