Dwarf Current Meter (MCM-02)

MCM-02 model Dwarf Current Meter is used to measure water velocity in shallow water. Where the dwarf current meter is used; Due to its proven qualities, accuracy and reliability in water, in small irrigation channels, in laboratories in rivers, at irrigation canal outflows and in salvage on seas, and in the measurements of water velocity in shallow water, dwarf current meters are used worldwide. Because it is a light and practical flow meter, it is usually preferred when measuring flow in shallow waters in remote areas. Two precision ball bearings, min. 0.025 m / sec. to max. 5 m / sec. the most sensitive "water velocity measurement" can be done by "reed contact" at the water flow rate. The water depth at which the dwarf current meter is used is at least 4 cm.

Assembly

The dwarf current meter is mounted on a 9 mm diameter shaft. Designed in the form of a cuffed tube as a very useful and precise device, the dwarf current meter works in harmony with the electronic meter during measurement. Current Meter body is made of brass, propellers are made of aluminum and measuring stalks are made of chrome. Body and propellers are nickel-plated. Where the water level is higher, it is advisable to increase the diameter of the compression rod to 20 mm so that a healthy measurement can be made.

Operating Characteristics of Propellers

Depending on different speed ratios, propellers with different slope values ​​are used. The propellers are integral parts. Depending on the flow and velocity of the water, which one can be used at the correct speed according to the angular values ​​of the propeller is given in Table 1. Depending on the flow and speed, selected propellers operate in accordance with the principle of cosine / precision with accuracy of ± 1% of the measured value.

Handle

9 mm. in diameter, 1.5 m. length, 3-piece with 50 cm, base iron and numbering every 5 cm.

Cable

With the return of the propeller in the water, the number of period is transmitted to the number with the contact cable (2 m.). The plugs on the cable ends are made of stainless chrome material.

Calculation of Flow Rate

The flow rate of the water is obtained according to the number of periods to be obtained at the end of the turn of the propellers. The k and Δ parameters in the formula v = k.n + Δ used in obtaining the velocity are determined when the instrument is calibrated. These parameters and the values ​​of "abak" indicating the speeds in the "n" speed are copied and reported in the memory of the electronic numerator device

v = k. n +?

v = Water velocity (m / sec.)

k = hydraulic gradient of the propeller in water (m)

n = a round trip average of the propeller

Δ = Characteristic (m / sec.) Of the Universal Current Meter according to the values ​​obtained from the tests made on an open calibration channel.

Since there are mechanical differences between the propeller and shaft bed between the current meters, the fixed values ​​are found by k and Δ are found by special tests on the special calibration channel (DSİ-TAKK).

Calibration values ​​are given in tables with current meter