12
Manual
US 3.10 713 FLOW CONVERTER 1905 - SW 833062
MJK Automation
Blokken 9
DK-3460 Birkerød
Denmark
Tel
+45 45 56 06 56
www.mjk.com
Model 3100 Hydrostatic Transmitter
The following directions should be followed when mount-
ing the pressure transmitter:
1: It should be mounted securely - preferably on
a pipe.
A 1 in pipe is used to prevent the
pressure transmitter from hurling around in a Parshall flume.
In case the water stream is so intense that the turbulence will affect the measuring
accuracy, the pressure transmitter must be placed in a stilling well.
Note, that the
transmitter should be positioned in the stilling well at the same height as the
zero flow level!
2: It should be placed in the correct height over the
bottom of the flume / weir.
1 in NPT thread
➀
Actual measurement
➁
Measuring range
➁
➀
Measuring distances for Palmer & Bowlus flumes
Diameter D: Distance L:
Diameter D: Distance L:
4”
2”
18”
9”
6”
3”
21”
10.5”
8”
4”
24”
12”
10”
5”
27”
13.5”
12”
6”
30”
15”
15”
7”
3: Mount the transmitter in the correct upstream
distance from the contraction in the flume / weir.
The distance depends on the dimension and type
of flume / weir.
4: Mount the transmitter at a location with no or very
little turbulence - preferably in a stilling well placed
in the correct distance from the contraction.
Measuring distances for Parshall flumes
Throat width b: Distance L:
Throat width b: Distance L:
1”
10”
36” 43”
2”
11”
48” 47”
3”
12”
60” 51”
6”
16”
72” 56”
9”
23”
84” 59”
12”
36”
96”
63”
18”
37.5”
120” 72”
24”
39”
144” 80”
(L = D/2)
A stilling well should always
be used together with a
pressure transmitter!
The use of a
stilling well is the
best option!
