IFM LK81 Series, Руководство по эксплуатации

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13.3 Calculation aids [OP]
For proper functioning of the overflow prevention OP, a minimum distance
(y) (Fig. 12-1) must be observed (→ 6.1) .
The following applies (Fig. 12-1):
B + c = L + u
and
B = z + y
B: tank height L: probe length
c: outside length
(maximum → 6 )
u: distance between probe and tank
bottom
y: required response level OP
from the cover (minimum
(→ 6.1) , maximum (→ 13.2) ).
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 LK8122:
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. 12-1
OP
c
z
B
L
13.3.2 Definition "from the bottom"
Response level (z) of the overflow prevention OP from the tank bottom is defined.
• Without offset ([OFS] = [0]): [OP] = z - u
• With offset ([OFS] = u): [OP] = z
Example:
z = 18.0 cm (from the tank bottom), u = 1.0 cm
Without offset: [OP] = 18.0 cm - 1.0 cm = 17.0 cm
With offset: [OP] = 18.0 cm