51-638 Echotel Model 338 Two-Wire Ultrasonic Transmitter
24
P40= 16
Trapezoidal weir
0.0032 < Q[m
3
/s] < 82
20 < P41[°] < 100
0.5 < P42[m] < 15
0.1 < h[m] < 2
Q[m
3
/s] = 1.772*P42*h
1.5
+ 1.320*tg(P41/2)*h
2.47
The range (P04) value is larger than the reference distance
(P46) as shown at left. Enter values for P40, P41, P42,
and P46.
P40= 17
Cipoletti trapezoidal (4:1) weir
0.0018 < Q[m
3
/s] < 50
0.3 < P42[m] < 10
0.1 < h[m] < 2
Q[m
3
/s] = 1.866*P42*h
1.5
The range (P04) value is larger than the reference distance
(P46) as shown at left. Enter values for P40, P42, and P46.
P40= 18
V-notch weir
0.0002 < Q[m
3
/s] < 1
20 < P42[°] < 100
0.05 < h[m] < 1
Q[m
3
/s] = 1.320*tg(P42/2)*h
2.47
The range (P04) value is larger than the reference distance
(P46) as shown at left. Enter values for P40, P42, and P46.
P40= 19
90° V-notch weir
0.0002 < Q[m3/s] < 1
0.05 < h[m] < 1
Q[m
3
/s] = 1.320*h
2.47
The range (P04) value is larger than the reference distance
(P46) as shown at left. Enter values for P40 and P46.
P40= 20
Circular weir
0.0003 < Q[m
3
/s] < 25
0.02 < h[m] < 2
Q[m3/s] = m*b*D
2.5
M = 0.555+0.418h/P41+(P41/(0.11*h))
The range (P04) value is larger than the reference distance
(P46) as shown at left. Enter values for P40, P41, and P46.
P46
P04
h
P42
P41
P46
P04
h
P42
1
4
P46
P04
h
P42
P46
P04
h
90
P41
P46
P04
h
