Flow Meter

Introduction:

YPL-MF Electromagnetic flow meters as they are called, operates on Faraday's law of electromagnetism to measure flow of conductive liquids. These flow meters efficiently measure liquid flow rate of liquids & converts it into 4-20mA output current signal or display it on LCD display unit. These flow meters incorporates advanced microprocessor based data processing electronics to ensure efficient and accurate operation, clear LCD unit to display flow rate & Totalized flow with EEprom memory to store data.

Flow meter is sub classified into two main models:

Integral Type - LCD: transmitter cum display electronic unit is mounted on top of the flow sensor. Remote Type - LCD: transmitter cum display electronic unit is separate wall mounted type & is connected to the flow tube sensor, with special cable to be ordered along with the flow meter.

Flow meter consists of a hollow cylindrical shaped main flow sensing unit, its inner surface is lined with suitable insulation material called liner. Two sensing electrodes are placed diagonally opposite to each other. When excitation signals are given to these electrodes, a magnetic field with a magnetic flux (B), is generated in the direction vertical to the measuring pipe sensor. At this time if the flux with specific electro-conductivity flows through the measuring pipe, the line of magnetic force will induct electromotive force E. Electromotive force E is in directly proportional to magnetic flux B. With the product of inside diameter 'd' of flow meter pipe and average flow velocity V, electromotive force E (signal of the flow) is measured by electrodes and sent through cable to transmitter unit. Transmitter magnifies these flow signals by computing flow rate of flux and after converting displays it as liquid flow rate on LCD & a 4-20 mA current output is also obtained. E = K B d V

In the equation: E = signal voltage of inner electrodes (v) B = density of magnetic flux (T) d = inside diameter of measuring pipe (m) V = average flow velocity (m/s)

In above equation, d is a constant. Since excitation current is constant B is also a constant. We can know from E = KBdV that flow rate of volume Q is directly proportional to signal voltage E, that is, signal voltage of flow rate induction E is in linear relation to flow rate of volume Q. So if only E is measured flow rate Q can be defined, which is the basic operating principle of magnetic flow meter. From E = KBdV we can see that the temperature of the measured flux medium, density, pressure, electro-conductivity and the liquid-solid proportion of the liquid medium will not affect the measurement result. To moving condition if only it accords with the flow of axial symmetry (such as laminar flow) it will not affect the result of the measurement. Due to its operating principle, same magnetic flow meter can be used for different liquids having different physical parameters without any modification & with great efficiency.

The flow meter's electronic unit is easy to configure by push buttons, have LCD display and efficient signal processing components. Various versions are available for use in different liquid media. Different Liners like Rubber & PTFE are available, for corrosive liquid like acidic effluent, acids, chemicals, pulps, juices, corrosive water etc. choice of optional measuring electrodes are available like SS316L, Hastelloy B, Hastelloy C, Titanium, Tantalum are available. Different models are available for high temperature operation and optional HART interface, RS485, RS232 communication, back light LCD display etc.

Application:

Water, diesel, washing tanks, acids, solvents, dye, Juices, oil etc.

Features:

When the liquid level rise in the tank, the liquid also rise inside the glass tube carrying a graduated pointer. The liquid level in the tank can be conveniently read against the pointer.

Specifications:

MODEL YPL-FM Versions Integral Remote Protection IP 65 IP 65 (IP 67, IP 68 optional) Connection Flanged - CS Sizes DN 25 ~ DN 2000 Liners Rubber / PTFE Supply 220 V AC , 50 Hz / Optional 24 V DC Output 4 - 20 mA Process Temperature -20 to 180 Deg. C as per model selection Media Liquids with conductivity ratio more than 5 μS/cm Electrodes SS 316L / Hastelloy B,C / Ti / Ta Accuracy 0.3% ~ 0.5% Flow tube SS-304 Outputs (optional) HART / RS 232 / RS 485 Signal Cable (optional) 10 ~ 20 meter integral (with remote version only)