NUS-7
Seite 24
NUS-7 K03/0617
P40= 19
THOMSON (90°-notch) weir
0.0002 < Q [m
3
/s] < 1
0.05 < h [m] < 1
Q[m
3
/s] = 1.320
h
2.47
Accuracy:
3%
P46
P40=19
P04
h
90
P40= 20
Circular weir
0.0003 < Q [m
3
/s] < 25
0.02 < h [m] < 2
Q[m
3
/s] = m*b
D
2.5
. where b =
f (h/D)
m= 0.555+0.041
h/
P41
+(
P41
/(0.11
h))
Accuracy:
5%
P40=20
P46
P04
h
P41
P46
Distance at Q=0
FACTORY DEFAULT: 0
Distance between sensor surface and the level at which
flow starts has to be
entered in this parameter
.
8.5 32-Point linearisation
P47: a Linearisation
FACTORY DEFAULT: 0
Linearisation is the method of assigning requested (calibrated or calculated) level,
volume or flow to values measured by the transmitter.
It can be used for instance if the sound velocity is not known (LEVEL
LEVEL) or
in the case of tank with other shape than under 6.4 or open channel other than
under 6.5 (LEVEL
VOLUME or LEVEL
FLOW).
a
Linearisation
0
OFF (FACTORY DEFAULT)
1
ON
Conditions of correct programming of the data pairs
The table must always start with: L(1)= 0 and r(1)= value (assigned to 0 level)
The table must be ended either with the 32
nd
data pair i.e. j=32 or if the
linearisation table contains less than 32 data-pairs j<32, it must be ended with a
level value “0” e.g.
L
(j<32)= 0.
The NUS-7 will ignore data after recognising level value “0” with serial number
other than “1”.
If the above conditions are not met, error codes will be displayed (see
chapter: Error Codes).
