The AKIM MCM-02 Small Current Meter is used for measuring the flow velocity at low water levels, e.g. in:
Small Rivers
Small canals
Streams
Lakes and seas
Pressure pipes, falajs
Natural water courses
es
Laboratori
Small Current Meter is used worldwide for
its proved quality, precision and reliability in
measuring low water level
It is especially recommended for measurements in remote regions whenever a
lightweight and handy measuring instrument
is required.
Small Current Meter provides solutions
for all velocity measuring applications. The
highly precise, reinforced spindle bearing as
well as an on- contact signaling system give
the possibility for measuring flow velocities
as from 0,025 m /sec. up to 5 m /sec.
Low starting speed of 0.025 m/sec. Minimum
depth of water for using this instrument is
approx. 4 cm.
Small Current Meters set the standard for
liquid-flow measurement and without them
hydrometry is not imaginable.
Fixing:
Small Current Meter can directly be fixed to a rod of 9
mm dia. A Relocating Device however, has proved to be
a useful facility, which is designed as sleeve tube and
is slided together with the current meter over the rod.
For measurements from higher places (e.g. bridges) it
is recommended, by means of the clamping piece to
use a rod of 20 mm dia. with relocating device
Measuring Ranges:
Depending on the pitch of the propellers used, different
velocity ranges may be obtained. Besides, the propeller
has a component effect. The angular degrees specified
in the table show the extent of oblique flow up to which
the propeller measures the true velocity value.
Within the stated ranges of oblique flow and velocity,
the propellers follow the law of cosine with an accuracy
of ± 1 % of the measured value.
Determination of Flow Velocit:
A calibration of the small current meter with the
relating propeller is necessary in order to determine
the water velocity “v” according to the equation;
v = k . n + ?
v = flow velocity (m/sec.)
k = hydraulic pitch of propeller (m) determined by
test runs in the modern hydraulic towing canal.
n = number of propeller revolutions per second
? = meter constant (m/sec.) determined by test runs
in the modern hydraulic towing canal.
Since among current meters there are mechanical
differences in the propellers as well as in the bearings,
the constants “k” and “?” are found by specific tests
in the modern hydraulic towing canal (Certificate of
Calibration DSI - TAKK).
If desired, the calibration equation (relation between n
and v) can also be supplied with fully calculated values
compiled in a table (Velocity table- TAKK).
Rod:
9 mm. dia., 1,5 m. long, 3 sections in 50 cm. , numbered
every 5 c
Connect ing Cable:
2 m. long
Teknik Özellikler
LCD Double Display
2 x 16 = 32 digits, Dot matrix, double line, indication, automatic battery control and insertable buzze
LCD Double Display simultaneously shows propeller type,
pulses, time, and flow velocity
30, 55, and 60 seconds is the time or retention as these
values can be set manuall
Key pad
6 buttons keypad for on and off, time setting,
Propeller choice, Buzzer choice and start/stop
After the calibration of the propellers, constant “k” and “?”
values can be entered for each propeller (See User’s Guide).
When the calibration is done again due to the mechanical
damages and the constraints change, “k” and “?” constant
values of each propeller can be entered again via keypad on
the counter The set and the remaining time can be seen on the screen
when the speed and water velocity is set at the same time
Timing set
30, 40, 50, 55, 60 and 100 sec. as can be made
with quartz clock.
Even if you don’t press the stop button of the counter, it has
the feature of self-closing after 4 minutes.
The flow velocity value can be seen on the screen; moreover,
buzzer beep is heard at the end of the arranged time when
the propeller takes a whole stroll.
Accuracy
Time measurement: 0.01 sec.
Impulse Counting: 1 impulse.
Maximum impulse frequency
40 impulse /sec
Time can be set in the range of 0-200 sec. within an interval of 5 sec.
When the Electronic counter is first started, it is arranged for 55 sec
It can be stopped, if required, by pushing the “stop” button after
a while it is started. Device calculates the time and the pulse
values and gives the flow velocity speed in the meanwhile when
it is stopped
