Manual – Xylem MJK 713 Open Channel Flowmeter User Manual
Page 12
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Manual
US 3.10 713 Flow Converter 1210 - Sw 833062
MJK North America, Inc.
37 Sherwood Terrace, #126
Lake Bluff, Il 60044
Tel.: 847-482-8655
Fax: 847-482-8654
[email protected]
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!