VEGA VEGASON 71 - 2 … 75 - 2 - Manual (Page 23)

Adjustment at differential measurement
71 - 2 … 75 - 2 23
Differential adjustment in m without differential measurement
Programming as pre-requirement
Mode 30 = 1
Mode 40 = 21 or 12, display coordination With this adjustment procedure two differences
in m are defined, relating to the values of 0 % and
100 %.
MODE 0 - 31 and 0 - 32
Programming example 1
with VEGASON 71 - 2 mounted at the same height
for weir control.
(Individual programming sequence of the min. /
max. difference)
• select mode 0 - 31 in MODEFIELD
• program 00.00 m in PARAMETER FIELD
• then store with STO-button
• select mode 0 - 32 in MODEFIELD
• program 01.00 m in PARAMETER FIELD
• then store with STO-button
The level difference can occur within the whole
range (in the example e.g. 0 … 5 m) and can be
detected.
Programming example 2 as above, however
sensors mounted at different height
program 0 m + 0,5 m = 0,5 m respective 0 %
in mode 31 = 00.50 m
program 1 m + 0,5 m = 1,5 m respective 100 %
in mode 32 = 01.50 m
Further adjustment of channel 1 and 2
Upstream adjustment Full adjustment mode 0 - 12 = 01.00 m program distance
(channel 1) Empty adjustment mode 0 - 11 = 05.00 m program distance
Downstream adjustment Full adjustment mode 0 - 22
(channel 2) example 1 = 01.00 m or
example 2 = 01.50 m program distance
Empty adjustment mode 0 - 21
example 1 = 05.00 m or
example 2 = 05.50 m program distance
m
0 %
distance level
5 0
channel 1
upstream
liquid
Max-difference 1 m ^ 100 %
Min-difference 0 m ^ 0 %
downstream
liquid
∆ = 1m
4
3
2
1 100
channel 2
+ 0,5
m
0 %
100
5 0
channel 1
distance level
upstream
liquid
min-difference
max-difference
downstream
liquid
4
3
2
1
channel 2
The value of the sensor in the plus range of
channel 2 must be added to the min. and max.
distance