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Universal Current Meter (CM-32)

The CM-32 is a flow meter used to measure water velocity.

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UNIVERSAL CURRENT METER (CM-32)

The AQUADATA Universal Current Meter CM-32 is a measuring
instrument to determine the flow velocity of water in open
canals, rivers, streams, rivulets, pressure pipes, lakes,
and the sea.

Universal application on different fixing devices for use on
rod or as cable suspended meter equipment.
The reliable instrument approved by many years practical
experience under hard conditions worldwide.

MAIN BODY

Made of high-quality, noncorrosive chromium steel, the
current meter can be used even under extreme conditions.
The propeller is filled with oil and rotating in two special
ball-bearings. The oil filling and a capillary seal protects
against water entry. A base stop prevents the propeller from
striking to the ground. Universal Application on different fixing
devices for use on rod or as cable-suspended meter
equipments, for use with AQUADATA single drum winches
or cable way installation.

CONTACT TRANSMISSION

The current meter propeller gets turned by the flow.
A permanent magnet turning with the propeller actuates,
once per revolution the built-in Reed Contact which is
watertight under pressure. The pulse sequence is nearly
proportional to water velocity in the measuring point.

GUIDING DEVICE (ROD)

This rod is manufactured from non-corrosive stainless
chromium steel.
20 mm. dia., 2 m. long, 2 sections,

CONNECTION CABLE

The number of cycles that appear with the rotation of the
propeller in the water is transmitted to the Signal Counter
via the connection cable (3 m.).
The plugs on the cable
ends are made of stainless chrome material.

DETERMINATION OF FLOW VELOCITY

The exact relation between the number of propeller cycles
per second and the water velocity is determined by 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 revolutions
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, constants k and Δ are
found by specific tests in the modern hydraulic towing canal
(Certificated of Calibration DSI - TAKK). If desired, the
calibration equation (relation between n and v) can also be
supplied with fully calculated value and complied in a
table (Velocity table – TAKK).

POSSIBILITIES OF APPLICATION

Current Meter On Rod:

For measurements in small rivulets and low water levels
with slow flowing speed, the CM- 32 Current Meter is used
in combination with a rod. The two Standard methods of
fixing the current meter to the rod are the following.

INSTRUMENT CASE (CM-32)

Made of resistant black ABS plastic.
Dimension: 19 x 33 x 45 cm,
Weight: Case including equipment approx. 5,5 kg.

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-07) with
input of up to 20 calibration results and additional indication
of the flow velocity in cm / sec. Universal Current Meter has a
working range between 0.025 m/sec. to 12.0 m/sec.
During the process. Reed contact is used for the pulse.

OPTION

Extra rod, extra cable, extra oil, sinkers, winch, mobile
bridge jib, car crane and relocation device.

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) and weight	11 x 9 x 5,5 cm. / 430 gr., IP-68

Propeller Size	100 mm dia 0,125 m pitch	80 mm dia 0,50 m pitch	125 mm dia 0,25 m pitch
Max. Water Velocity (m / sec.)	5,0	10,0	12,0
Starting Speed (m / sec.)	0,025	0,040	0,025
Range of Component Effect	± 45º	± 5º	± 5º
Material	Metal	Metal	Metal

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.

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

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.

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.