KROHNE LEVEL-SONIC BM90 Series Installation And Operating Instructions Manual page 22

Pr. 40 Vessel Shape (D=0)
' 0 ' = no volume conversion
1 = flat bottomed vessel and percentage of span
2 - 7 = standard shapes as shown below
8 = vessel linearisation (see Pr.44)
Pr. 41 Vessel Dimension H (D=0)
Enter H where indicated above in units selected at Pr.2.
Pr. 42 Vessel Dimension L (D=0)
Enter L where indicated above in units selected at Pr.2.
22
Pr. 43 Display Conversion (D=1)
If Pr.40 entry is between 1 - 8 then enter - full scale dis-
p l a y ¸ 100
e.g. if 100% = 2000 litres and display required in litres
then set Pr.43 to 2000 ‚ 100 = 20.
To display in any unit enter any value from '0.001' to
Enter 1 '9999'
F l a t
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NOTE:
Display cannot be more than 4 digits. If it is neces-
sary to measure 20,000 gallons, then display in thou-
sands of litres (or cubic metres) by dividing 20 by
Enter 2
100 = 0.2.
Pyramid
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Pr. 44 Linearisation (D= ==== )
This function allows non-standard flumes and vessels to
be characterised. For full details please refer to Appendix
1, pages 39 to 40.
Enter 3
Pr. 45 Flow exponent (D=1)
Conical
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Enter the required value for open channel flow device
being used.
e . g . Flow Device
Unity
Enter 4
Rect. flume 3/2
H a l f
Rect. weir 3/2
sphere
V-notch weir 5/2
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Special
Parshall Flumes
The OCM flow exponent (Pr.45) has been expanded to
include 10 Parshall flume profiles. The data for the
Enter 5
selected flume is loaded into the flume mapping system
Parabolic
(Pr.44) from tables held in memory.
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Size
5 : 1,2,3,24
6 : 6
Enter 6
7 : 9
F l a t
8 : 12
ends
9 : 18
1 0 : 36
1 1 : 48
1 2 : 72
Enter 7
1 3 : 96
parabolic
ends
1 4 : 10,12,15,20,
25,30,40,50
Maximum head is entered in Pr.4 and the associated
maximum flow in Pr.46. If one of the values is known, the
other can be found in the flume tables or by calculation
from
where H = Inches, Q = US GPM and
(for imperial gallon multiply K factor by 0.8).
Enter
1
2
2
3
4 (Refer to Pr.44)
5-14
Exponent
inches
inches
inches
inches
inches
inches
inches
inches
inches
f e e t
Q = KHn GPM,
K = Constant for flume size
1.550
1.580
1.530
1.522
1.538
1.566
1.578
1.595
1.606
1.600