High Precision Turbine Flow Transmitter Explosion Proof 220VAC Three Wire

NYLD-G Gas Eletromagnetic Flowmeter

The NYLD-G gas turbine flowmeter is a new generation of high precision, high reliability gas precision measuring meter integrating temperature, pressure, flow sensor and intelligent flow totalizer developed by the advanced technology of flow meter at home and abroad, optimized by theories of gas mechanics, fluid mechanics and electromagnetics, which has excellent low pressure and high pressure metering performance.

It has a variety of signal output modes and low sensitivity to fluid disturbances, and is widely used in the measurement of natural gas, coal gas, liquefied gas, light hydrocarbon gas.
This type of turbine flowmeter is an explosion-proof product with an explosion-proof rating: ExdIICT6

NYLD-G Gas Eletromagnetic Flowmeter Technical Parameters

Basic Parameters

Technical parameters

Note: the pressure loss at the maximum flow rate (Q) is the value measured with dry air (density is about 1.2 kg/m) under normal pressure, qt = 0.2Qmax.

NYLD-G Gas Eletromagnetic Flowmeter Operating Principle

When the fluid passes through the flowmeter, it is rectified and accelerated by the action of the guide vane (or rectifier). Since the impeller is at an angle to the fluid flow direction, at this time,the turbine generates a rotational moment. After overcoming the friction torque and the fluid resistance torque, the turbine starts to rotate. In a certain flow range, the angular velocity of the turbine rotation is proportional to the volume flow rate of the fluid. According to the principle of electromagnetic induction, a magnetic sensitive sensor is used to induce a pulse signal proportional to the volume flow of the fluid from the synchronously rotating communicating plate. This signal is sent to the volume corrector and is processed together with signals such as temperature and pressure, and displayed on the LCD screen. Its structure principle is shown in Figure 1..

4.2Volume Corrector Working Principle

The volume corrector consists of temperature, pressure detection analog channel, flow detection digital channel, micro processing unit, liquid crystal drive circuit and other auxiliary circuits, and it is equipped with an external signal interface.After converting and processing the multi-channel signals sent from each sensor, the signals is brought into the formula for operation according to the gas equation to realize the local display and remote transmission of various signals.

The gas equation can be written as

Where:

    Vo — the volume unde3r the standard condition (m3);

    V — the volume under the3 working condition (m3);

    P=Pa+Pg — the absolute pressure (kPa) at the flowmeter pressure detection point;

    Pa — local atmospheric pressure (kPa);

    Pg—the meter pressure (kPa) of the flowmeter pressure detection point;

    P0 — the standard atmospheric pressure (101.325kPa)

   T0 — the absolute temperature under the standard condition (293.15K, which can be 273.15K according to user requirements);

    T — the absolute temperature of the measured medium (27315+t)K;

     t — the temperature of the measured medium (°C);

    Fz—Gas compression coefficient

    Zn — the gas compression coefficient under standard sate

    Zg — the gas compression coefficient under working condition;

NYLD-G Gas Eletromagnetic Flowmeter Design Features

■  High precision, good repeatability and wide range ratio,up to 1:20 (or wider);

■  Use integrated type new rectifier, the requirements for the front and rear straight pipe sections are lower (front ≧5DN, rear ≧3DN);

■  Use a carefully designed dust-proof structure to ensure the reliability of long-term bearing operation;

■  Designed with a unique fueling system to ensure reliable fueling, easy maintenance and beautiful appearance;

■  Thetechnical indicators meet the requirements of I509951-1993,the length of the body is 3DN, and the whole machine has reachedthe international advanced level;

■  Thevolume corrector of the flowmeter can be rotated freely by about 350 degrees, which can be easily read in various installation modes.

■  Low speed, high life, low pressure loss, high precision;

■  It integrates high-precision temperature, pressure, flow sensor and volume corrector, which can detect the temperature, pressure and flow of the measured gas, and automatically track and compensate the flow and correct the compression coefficient. The meter has real-time database and communicatesvia RS485 interface and meter reading network to facilitate centralized data collection and real-time management;

■  Use high-performance microprocessor and modern digital filtering technology, with powerful software functions and superior performance;

■ Use floating point calculation and automatic correction of five-segment meter coefficient, and has fault; self-diagnosis and alarm function;
■ Use micro-power high-tech, with internal and external power supply, and low power consumption;
■ Local display flow value with multiple signal output functions;
■ Use a high-contrast three-line LCD display, it can display standard cumulative flow, standard volume flow, working volume flow, medium temperature, pressure value and battery capacity percentage with Chinese prompt;
■ With real-time data storage function, it can prevent data loss when battery is replaced or suddenly power down . In the power-off condition, internal parameters can be permanently saved.
■ With explosion-proof function, the explosion-proof mark is ExdIIC6.