Aircraft Hangars
Engine Test Bays
Oil Refineries
Turbine Halls
Boiler Fronts
Coal Stacks
Recycling Plants
Waste Handling & Tips
Paint Spraying Areas
Fuel Distribution Sites

The 7000 Series units are designed for long range monitoring of extensive locations for flame conditions. The unit is most applicable to situations where conventional building fire protection sensors can not be practically employed. With both open air sites and large enclosed areas, such as aircraft hangars or power stations, the normal rules regarding heat convection patterns, smoke stratification, and collection profiles at the ceiling are not applicable. This makes point heat and smoke detectors ineffective. Sites where there is a potential hazard due to volatile materials such as aviation fuel and PRB coal are particularly suitable for protection by Patol’s Series 7000 Flame Detectors.
The detectors have four basic sensitivity settings. Each of these levels has a ‘zoom’ option. Euro-Standard EN54-10 employs a 330 x 330 mm pan of ignited n-heptane for range classification. Based on this the table shows the typical range along the optical axis of the field of view as shown.
The system is blind to both visible light from the sun or local luminaires, and black body emissions from hot machinery etc.

 
Click to enlarge FIGURE-1
 
 
 
  Click to enlarge FIGURE-2
 

The exact location of the flame monitors, in order to adequately protect any particular site, is dependant on:- the space’s dimensions, the flame hazard (potential flame type/size), and the performance characteristics of the 7000 series flame detector.
The 7000 units should be directed toward the centre of the protected area and ideally have a completely unobstructed view of all hazards. This is an unusual site coverage for a single detector.
The exact position and orientation of units must take into account obstructions to the field of view. Most applications will require two or more detectors for full coverage, even though some sub-areas will then be monitored by multiple devices.
Figures 1 & 2 show a typical arrangement for an aircraft hangar. The area under the aircraft is a particular hazard. Thus the example shows detector placement at both high and low level to obviate obscuration by aircraft wings and body.
With other applications, such as power station turbine halls or boiler areas, detector placement at both high and low level obviates obscuration by mezzanine floors and machinery.  

When the protected area is very large, as would be for multiple aircraft service facilities or multi-unit power stations, the overall space must be sub-divided into zones - each zone similar to that indicated in figures 1 & 2. A degree of overlap of zone boundaries should be employed to ensure effective coverage.

If fire extinguishing media is to be automatically activated, all associated sub-areas/zones should have duplex coverage such that a “double knock” regime for “release” can be implemented.