29
UK
13.3 Calculation aids [OP]
For proper functioning of the overflow prevention OP the minimum distance
(y) (fig� 13-1) must be observed
�
The following applies (fig� 13-1):
B + c = L + u
and
B = z + y
B: Tank height
c: Outside length (maximum
)
y: Required response level OP
,
maximum
)
L: Probe length
u: Distance between probe and tank
bottom
z: Required response level OP from
the bottom (maximum: z < L - c - y
or z < B - y)
13.3.1 Definition "from the cover“
Required distance (y) of the overflow prevention OP
"from the cover" is defined�
• Without offset ([OFS] = [0]): [OP] = L - c - y
• With offset ([OFS] = u): [OP] = L - c - y + u
or
[OP] = B - y
Example:
c = 3�0 cm, y = 5�0 cm, u = 1�0 cm
Without offset: [OP] = 26�4 cm - 3�0 cm - 5�0 cm
= 18�4 cm
With offset: [OP] = 26�4 cm - 3�0 cm - 5�0 cm + 1�0 cm
= 19�4 cm
Fig. 13-1
OP
c
z
B
L