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Small Current Meter (MCM - 02)

MCM-02 is a flow meter used to measure water velocity in shallow waters.

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SMALL CURRENT METER (MCM-02)

Small Current Meter is used worldwide for its proved
quality, precision and reliability in measuring low water
levels. 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.

PROPELLER'S SPECIFICATIONS

Depending on the different speed ratios, propellers
with different pitch values are used. Propellers are
integral parts. Depending on the flow and speed of
the water, which propeller will be used at the correct
speed according to its angular values is given in the
Technical Specifications section.The propellers
selected depending on the flow and speed operate
in accordance with the cosine/precision principle with
an accuracy of ±1% of the measurement value.

OPTION

Extra rod, extra cable, extra oil.

ROD

9 mm. dia., 1,5 m. long, 3 sections
in 50 cm. , numbered

CABLE

2 m. long

DETERMINATION OF FLOW VELOCITY

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 + Δ 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 cycles
per second Δ = 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 “Δ” 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).

INSTRUMENT CASE MCM-02

Body Material; Brass, nickelplated
Size of the instrument case; 54x18x8cm. 4,6 kg.
Small Current Meter. Metal Instrument Case includes
basic unit; Propellers, electronic counter, rods, and all
its accessories.

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.

SIGNAL COUNTER Z07

This full electronic counter is able to receive frequencies
for all flow velocities. The impulses generated by the
Current Meter are added and indicated in relation to the
preselected time. The timing starts from the first impulse.
This counter is able to calculate the current velocity
directly by means of predefinable equations (Z-05) with
input of up to 20 calibration results and additional
indication of the flow velocity in cm/sec.

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.

USAGE AREAS

Small Rivers
Small canals
Streams
Lakes and seas
Pressure pipes, falajs
Natural water courses
Laboratories

LCD Display	128x64 Grafic Dot Matrix. double line, indication, automatic battery control and insertable buzzer.
Key Pad	6 buttons keypad for on and off, time setting, Propeller choice, Blacklight choice and start/stop.
Timing Set	30, 40, 50, 55, 60 and 100 sec. as can be made with quartz clock.
Accuracy	Time measurement: 0.01 sec. Impulse Counting: 1 impulse
Maximum impulse frequency	40 impulse /sec.
Temperature Range	- 20 ºC + 70 ºc
Power Supply	3.7V Lithium Ion
Case (size)	Contalı ABS – (11 x 9 x 5,5 cm.) – IP -68
Weight	430 gr.

Propeller Diameter & Pitch	50 mm dia 0,05 m	50 mm dia 0,10 m	50 mm dia 0,25 m	50 mm dia 0,50 m	30 mm dia 0,05 m
Max. Speed (m / sec.)	1,0	2,0	4,0	5,0	1,0
Min. Speed (m / sec.)	0,025	0,030	0,035	0,060	0,050
Component Effect	± 30º	± 20º	± 10º	± 5º	± 20º
Material	Aluminium	Aluminium	Aluminium	Aluminium	Aluminium

30, 55, and 60 seconds is the time or retention as these values can be set manually.

After the calibration of the propellers, constant “k” and “Δ” 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 “Δ” constant values of each propeller can be entered again via keypad on the counter

LCD Double Display simultaneously shows propeller type, pulses, time, and flow velocity.

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.

The set and the remaining time can be seen on the screen when the speed and water velocity is set at the same time.

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.