TechnoTrade ALMAZ, Руководство пользователя

Страница: 11 / 14

POINT TYPE FLAME DETECTOR "ALMAZ"
www.technotrade.ua Page 21 of 27
APPENDIX F
Definition of area, controlled by FD in guarded premises.
FD is installed on the walls and enclosing structures of buildings, as well as under ceilings
or floors in premises controlled.
1. FD wall mounting.
In case of mounting the FD on the wall of guarded premises controlled area is as follows
(see. Figure F.1):
Figure F.1
POINT TYPE FLAME DETECTOR "ALMAZ"
www.technotrade.ua Page 22 of 27
In general, configuration of the controlled area looks like an ellipse, a square value is
calculated using the formula (1.1):
S =
π · a · b, (1.1)
where a, b - semi-axis of the ellipse.
Semi-axis a and b can be obtained from the canonical equation of the ellipse and
trigonometric ratios sides and angles of triangles, which are cone section view of the FD.
At small angles of the optical axis of the FD you should be aware that some of the
controlled area is cut off by a wall where the FD is mounted, thus the controlled area Scon
= S - S1, where S1 - area, cut off by the wall.
Because the controlled premises usually have a rectangular shape, the quality of
evaluative value of the area you can use the square inscribed in an ellipse rectangle:
S
P
= 2 · a · b – S
1P
, , (1.2)
where S
1P
– is the cut off the by wall area.
Scon and Sr values of the area for the FD "Almaz", depending on the height of FD
mounting H, the maximum range of flame ignition source Lmax, the angle of inclination of
the optical axis
σ and the viewing angle of FD Δ , and the distance from the wall to the
center of the ellipse x and the half the length of the cutting y are given in table F.1.
Calculation and optimization of these values in the criteria of maximum protected area are
performed using software mathematical provisions on PC.
1.1. FD "Almaz" Δ = 90 °, Lmax = 50 m.
FD "Almaz" is usually selected to mount at a sufficiently great height. The most optimal
angle of the FD -
σ = 30 °. When installation height is up to 7 m you can increase the angle
by (5 ÷ 10) degrees. This will increase the protected area in 1,5 ÷ 2 times.
Table F.1 ( σ = 30 °)