Extinguishing Systems

  The detection of gases in the environment is one of three objectives:

- Detection of flammable cleaning (explosive gases and gas mixtures)

- Detection in Toxic (toxic gases)

- Detection of oxygen deficiency Explosion protection;

Combustible gases and vapors mixed with air. This range, called the explosion range, Identified. (Lower Explosion Limit-LEL and Upper Explosion Limit-UEL).

Under the LEL, it is harmless to substances, and above the UEL it remains flammable, dangerous as a target.

Comparison of Gas Sensor Principles

There are different measurement criteria for gas extinguishing. Semiconductor sensor, pelistor sensor, electrochemical cell, opto-acoustic sensor, infrared absorption sensor are the basic detection sensors. It can be said that semiconductor sensors can only be used when the ambient atmosphere does not change and no concentration details are required. False alarms cannot be completely excluded. The classic detector of combustible gases, the pelistor, is compromised by sensor poisoning and sensor inhibitors. If these substances cannot be excluded, there are no other obstacles to the use of the pelistor. The electrochemical cell is very expensive, especially in terms of maintenance. On the other hand, if a particular gas is detected at very low concentrations, it is the first choice because of its selectivity. The use of an opto-acoustic sensor results in a more frequent result than the infrared absorption sensor due to its operating principle. Both methods are highly suitable for the detection of flammable gases and vapors and have the best qualities of all options considered. The most critical point during planning is to know the environmental conditions. The state of the environment must be clearly defined and recorded. To summarize this information;

− substances to be detected   

- Dominant / related substances    

- Evaluating and evaluating these substances   

 - Where do these substances come from?    

- How are they being transported, stored and processed?   

 - What are the temperatures?    

- What's the humidity?    

- Wind conditions / ventilation conditions?    

- Cleanliness of the environment (in terms of sensor positions and inhibitors)

Based on this information, the type, number and location of the detectors can be determined. The following details must also be taken into account:

• Gases and vapors are transported by air currents significantly faster than diffusion.

• The geometry of the room, equipment in the room, machine temperature conditions, ventilation etc. it determines the emission of gases and vapors in the event of leakage.

Therefore, in the placement of the detector, the evaluation of the room's geometry and ambient conditions is often more important than simple assumptions based on low density.

Central Equipment

Siemens XC10 Extinguishing Control ..

Detectors

Siemens DM1103 Extinguishing Button

Siemens Heat-Smoke Detectors