User's Manual

Commissioning
Page 32
Item Name Description
W1
= Protection level 1 Enter password 1
FI
= Low product reflection warning Two digits; default value: 75. The maximum value is 99 and
delay counter then the delay is approximately 1 minute. During the delay, the
last valid measured level is transmitted as the product level.
EX
Exit Exit protection level
Reduced accuracy
Obstructions in the tank may produce reflections. When the level reflection is in the neighbourhood of an
obstruction reflection the accuracy of the obtained level reading is reduced. The software provides for
entering data to describe obstruction zones. See items
OS
,
OE
,
OT
and
OZ
. This can be used to detect that
the level reflection is in an obstruction zone. When in addition level calculation decision switch item
4V
position 2 is set to 'O', a reduced accuracy warning will be set if the level reflection is in an obstruction zone.
When the level is in the bottom zone, a bottom reflection may reduce the accuracy of the level reading.
When the level calculation decision switch item
4V
position 1 is set to 'B' , a reduced accuracy warning will
be produced if the level is in the bottom zone.
Peak selection with roof reflector
With light products it is possible to have a reflection from the tank bottom, specially at lower level through
the product. Therefore, there is a routine that in the bottom zone is searched for a smaller peak in front of
the highest peak, which is caused by the bottom.
However, when a roof reflector is used it is impossible to look through the product. That information is given
in item
4S
, second position.
Item Name Description
W2
= Protection level 2 Enter password 2
4V
= Level calculation decision switch Ten characters; default setting: - - - - - - - - - -
Pos. Char. Function
1 B Reduced accuracy if level peak in bottom zone
- No reduced accuracy if level peak in bottom zone
2 O Reduced accuracy if level peak in obstruction zone
- No reduced accuracy if level peak in obstruction
zone
3 D Double reflection detection enabled (always)
4 S Reduced accuracy if level peak detected above
the maximum safe fill height (item
SF
)
- No reduced accuracy in the above situation
5 P Search for product peak before bottom reflection
(always)
6 - Not used
7 F Enables AdvancedDSP level calculation
- Normal level calculation
8 - 10 - Not used.