VEGA VEGATROL 20 Ex - Manual (Page 18)

VEGATROL 20 Ex 18
4 Supplement
4.2 Calculation information for sensor length
The determination of the sensor length must be generally made with the respective expert.
Example: cylindrical tank
3000 mm
L
0 mm
Procedure
- calculate the level of the max. permissible volume
85 %, e.g. 2400 mm
- determine the distance from the flange lower edge up
to the calculated level
- determine the total length of VEGASWING
L = distance + 25 mm
(25 mm = submerging depth up to the switch point)
in this example
L = 600 m + 25 mm = 625 mm
A VEGASWING with a total length of 625 mm must be
ordered.
Note:
An increase of the total length of VEGASWING will cause
the instrument to respond even at low levels, a reduction
causes a response at higher levels.
If the required total length cannot be exactly determined,
the calculated value must be rounded up (determination to
the safe side).
600 mm distance from
flange lower edge to the
determined swicht point
Volume 85 %
corresponds to 2400 mm