Xylem MJK 713 Open Channel Flowmeter - Manual (Page 6)

6
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
Product identification
General
A standard MJK 713 is delivered for two different measur-
ing ranges (0 - 1 ft and 0 - 3 ft).
It is very important that the measuring range is correct
for the flume in question in order to obtain maximum
measuring accuracy.
Check that the item(s) delivered corresponds to the or-
dered item(s). the item number is printed on a label that
is sticked onto the packing. Shown below is the label for
a MJK 713 System Package 1 delivery including a MJK
713 flowmeter and a Shuttle
® ultrasonic sensor:
An identical marking can
be found on the right
hand side of the level
transmitter cabinet:
Mounting
General
MJK 713 measures the flow in an open flume or weir
based on the level of the head in the flume. the method
of measurement are based on the following mathematical
function:
Flow Q = f(head
x
× constant)
where the exponent x and the constant depends on the
type of weir or flume.
the flow converter has 3 different linearization
systems depending on how the volume of water is mea-
sured:
-
preprogrammed formulas for different dimensions of
the most common flumes and weirs, Parshall flumes,
Palmer & Bowlus flumes, v-notch weirs, and rectan-
gular weirs.
- for other flumes and weirs with a known calculation
formula the exponent and the factor of the calcula-
tion formula can be set.
- for flumes where no calculation formula exists, a
number of known flow values can be entered,
on which a point linearization and curve extrapolation
is calculated.
It is obvious that the flow calculation is highly dependant
on the accuracy of the level measurement. It is therefore
important to follow the mounting instructions carefully for
the Shuttle
® Ultrasonic Sensor (MJK 713 System Pack-
age 1 or 2) or MJK model 3100 Pressure transmitter
(MJK 713 System Package 3).
Explosion hazardous areas
the Shuttle
® ultrasonic sensor is ex approved and can be
mounted in Zone 2 without the need of a
zener barrier. It is not approved for Class I Division I
zones.
The Flowmeter (= the electronic box with
display) must not be mounted in explosive
hazardous areas.
➀
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➃
➂
➂
➁
➀ Item number
➁ Item description
➂ Serial number
➃ Software version