High Precision Turbine Flow Meter Sensor Good Repeatability 1000m

NYLD Turbine Flowmeter

The NYLD turbine flowmeter (Abbr. TUF) is a main type of Impeller Flowmeters also including the Anemoscope and Water meter. TUF is made up of Sensor and Conversion-Show. The Sensor reacts to the average velocity of fluid with multi-blades rotor so as to speculating the flow value and the accumulative flow value. The velocity (or circles) of rotor can be picked up by the way of mechanism, electromagnetic induction, photoelectricity, before displaying and transmitting the records by reading device.
It is said that America announced the first TUF patent early in 1886. The patent in 1914 recorded that the TUF flow value is relevant to frequency. The first developed TUF in 1938 is applied to measuring the fuel flow in the aircraft. It is eventurelly achieved to use in the industry until the end of the world war two, since it is urgent for the jet engine and liquid jet fuel to demand high accuracy, quick responses flow measurement instrument. Nowadays, it can be extensively used in the fields of oil,chemical,defence,science,measuring, etc..
NYLD series Turbine Flowmeters draw the leading technology integrating with advanced design to produce the new generation of turbine flowmeter with the features of simple structure, light weight, high accuracy, good repeatability, flexible reaction, convenient installation/maintenance/application etc.. It is widely applied to measuring the liquid of which kinematic viscosity is under 5*10-6㎡/s and have no impurify of fibre,grain etc.,and no corrosive interaction with the stainless steel 1Cr18Ni9Ti,2Cr13,and A12O3, and hard alloy in seal pipes. The liquid of kinematic above 5*10-6㎡/s can be measured after real liquid calibration of flowmeter. It can be used in value control, siren when excess, if co-ordination with special display instrument. So it is the ideal instrument of measuring flow value and saving energy.

NYLD Turbine Flowmeter Basic Parameters / Technical Specification

Technical Specification

Measurement range and Working pressure for liquid

Measurement range and Working pressure for gas

NYLD Turbine Flowmeter Operating Principle

As the measured liquid flows through the sensor, the drived vane begins to turn, which velocity is in direct proportion to average flow one in the pipe. The turn of vane periodically changes the magnetic resistance value of magnetoelastic transducer. Magnetic flux in the magnetic test coil happens to change cyclically with it to produce periodic induced voltage, it is the pulse signal, that will be sent to the display to show after amplified by magnifier.

Flow rate equation of Turbine Flowmeter includes both practical and theoretical one:

• Practical equation:

                 Q_v=f／k

Q_m= Q_v vρ

    Q_v refers to volume flow rate, (unit: m³/s)

    Q_m refers to mass flow rate, (unit ㎏/s)

    f : refer to output signal frequency (unit Hz)

    k : refer to the Flowmeter factor, (unit P/m³).

The related curve of flowmeter factor and flow rate is in the graph (Diagram: Turbine flowmeter characteristic curve). As your seeing, the factor curve can be divided into two parts of linearity and non-linearity. The linear part accounts for two-thirds of the entire curve which feature is related to the structure, size of sensors, and fluid viscosity. The feature in non-linearity part is influenced by friction force from bearing, the viscosity resistance of liquid. When flow rate is below the lower limit of sensor, the instrument factor are quickly increasing with it. The value of pressure loss and the flow rate are similar to be square relations. If flow rate surpassed the upper limit, pay attention to preventing from cavitation. When the turbine flowmeters have similar structure, their curves have similar feature but have different system errors.

The sensor factor can be worked out by calibration instrument, which may have no consideration of the sensor’s inside fluid mechanism, and can be confirmed by inputed flow rate and outputed pulse signals of frequency. So we can see the sensor as a black box , that is convenient for application. But please note that the conversion factor (or instrument factor) should comply with some conditions which calibration condition is the reference condition . If it deviate from this condition, the factor will happen to change. The changes would be determined in terms of the sensors type, the pipe installation condition,and fluid physical parameters.

• Theoretical flow rate equation:

According moment of momentum theorem can list the equation of motion impeller.

J dw dt =M₁-M₂-M₃-M₄

In the formula,

J: impeller inertia moment;

dw dt: rotational acceleration;

M₁ : Liquid-driven torque

M₂ : Viscous resistance moment

M₃ : Bearing friction moment

M₄ : Magnetic moment.

When impeller is rotating according to constant velocity, J dw dt =0, and M₁=M₂+M₃+M_4. Through the analysis in theory and verification in experiment ,the formula can be deduced that is:

n=Aq_v+B- C q_v

In the formula,

n: refers to impeller rotational speed;

q_v: refers to volume flow rate;

A: the factors related to fluid physical properties ( include density, viscosity etc.), impeller structure parameters (blade angle, impeller diameter, flow channel cross-sectional area etc.);

B: the factors related to top vane gap, and fluid flow velocity distribution;

C: the factor related to friction moment.

The scholars domestic and abroad have put forward to many flow equations in theory, applied to various sensors structures and fluid working conditions. Until now, the hydrodynamic characteristic of turbine instrument ones is still unclear, for it has complicated relationship with fluid physical property, and flow characteristics. For instance, when there appears to swirling and unsymmetry velocity distribution in flow field, the hydrodynamic characteristics are very complicated.

So instrument factors can not be deduced by theoretical formula, can be confirmed by real flow calibration. But theoretical formula has been significant in practice. It can be used in instruction in the design of sensor structure parameter and the forecast ,and assessment of instrument factor changing rule.

NYLD Turbine Flowmeter Feature

• High accuracy (regular accuracy±1%R, ±0.5%R, highest accuracy±0.2% R);
• Good repeatability (short-term one reaches 0.05%--0.2%), priority to be used in trade settlement for its extremely high accuracy in the regular calibration or on-line calibration.
• Pulse frequency signal output is applicable to totality calculation and computer connection with no zero drift and strong anti-interference capacity.
• High frequency (3-4kHz) can be achieved, and has high resolution.
• Wide rangeability: medium or large diameter may reach 1:20,and small diameters are 1:10.
• Compact and light weight structure, convenient installation and maintenance, extensive application ability.
• Application to high pressure measurement with its unnecessary opening hole to be made into high pressure instruments.
• Complete tailored version sensors can be designed to different kinds of types according to users special needs. For instance, low temperature type, high pressure type, sanitary type, etc.
• Insertion type can be made, that is applicable to large normal diameters measurement for its little pressure loss, low price, unnecessary stopping flow to take out it, and convenient installation and maintenance.

NYLD Turbine Flowmeter Category

1.NYLD series can be divided into two categories by function:

• Turbine flow sensor / transmitter
• Intelligent integration Turbine Flowmeter

2.Function illustration:

Turbine flow sensor/ transmitter

This kind of products have no scene display function,only produce signals to transmit output to far distance. The flow signals can be divided into pulse or current (4-20ma) signal. This instrument has low price, high assemble, small size, so can be applicable to match second displayer,PLC,DCS so on computer control system to use.

According to different signal outputs, its can be divided into NYLD-N and NYLD-A types.

NYLD—N sensor
12--24V DC power supply, three wires pulse outputs,
high level≥8V, low level≤0.8V, signal transmission distance≤1000M.

NYLD—A transmitter
24V DC power supply, two wires current (4—20mA) signal output, signal transmission distance≤1000M.

Intelligent integration turbine flowmeter
It adopts an advanced super-low power consumption single-chip microprocessor technology to make up of new intelligent flowmeter with turbine flow sensor and accumulative calculation displayer integration. It has many obvious advantages which are double-row LCD display at the scene, compact structure, direct and clear reading, high reliability, anti-interference from outside power, anti-thunder attack, and low cost ,etc.
It has the instrument factors’ three points rectified, non-linear intelligently compensated, and revision at the scene.
High clear LCD display simultaneously shows both instant flow rate (four valid figures) and accumulative flow rate (eight valid figures, and accumulative flow rate (eight valid figures with reset). All valid data can be kept for ten years. This kind of turbine flowmeters all are explosion-proof products, and the explosion-proof class is ExdIIB6.
This type of turbine flowmeters can be divided into type NYLD—B and NYLD—C in terms of supply power and the remote signal transmitting methods.
NYLD—B type: supply power 3.2V10AH(Lithium battery) can continuously run more than four years, but no signal output.
NYLD—C type: supply power 24V DC outside, output normal two wires current signal (4-20 m A) , and can add RS485 or HART communication according to different scene demand.

NYLD Turbine Flowmeter Type Choice

Note: DN15—DN40 need thread connection regularly,but can be made into flange connection through adding the “FL” to the nominal diameter at its end.

NYLD Turbine Flowmeter Installation Size

NYLD Turbine Flowmeter Cautions in Installation

(1)The installation site:
Sensor should be installed in the sites where is convenient to maintain, have no vibration of pipe, no strong electromagnetic interference, and hot radiation influence. The typical pipe installation system of turbine flowmeter is following as the picture. The each part of configuration can be chosen in view of the objects measured ,which needn’t all. It is sensitive for turbine flowmeter to velocity aberrance and rotating flow, so entering sensor should be the pipe flow developed enough and match the necessary straight pipe or rectifier. If upstream side components of flow resistence are variables, the pipeline length upstream generally is not less than 20D and the pipeline length downstream is not less than 5D. If the installation space does not satisfy these demands, the flow rectifier may be installed between the component of flow resistence and sensor. The sensor should be installed outside where avoids the direct sunshine and rain.

(2)The installation demands on connection with pipes:
The horizontally installed sensor demands the pipeline inclination shouldn’t be visible (generally within 5°), and the vertically installed one should be same as it.The site needed to run continuouslly should install the by-pass pipe and reliable cut-off valve. It must be assured that the by-pass pipe has no leakage when measuring.
Location of sensor in a new pipeline is replaced into a short pipe first. After the pipeline inside has been cleared , the short pipe can be changed back into sensor formally. For this step always has been reglected, the sensor may often be damaged during clearing pipeline.
If the measured fluid includes impurity , the filter should be installed before sensor of upstream side. To continuous flow liquid should install two sets of filters which clear impurity in turn, or choose auto clearing type filer. If the air mixes in the liquid, the eliminator should be installed in the upstream side. The mouth of filter or eliminator must be led to safe site.
If the location of sensor is at the lower point of the pipeline, the drain valve should be fixed after the sensor to discharge the impurity regularly in order to prevent from dwelling deposit. If the measured liquid is easy to be aerified , the exit pressure of sensor should be more than Pmin in order to prevent from air pockets that may damage the accuracy and live time.
    Pmin=2⊿P+1.25Pv Pa
    Pmin: The lowest pressure, Pa;
    ⊿P: the pressure loss while the sensor flow rate is the biggest Pa;
    Pv : the saturation vapour pressure when the use temperature arrives at the highest point Pa.

Flow control valve should be fixed in the sensor’s downstream ,and the cut-off valve at the upstream side all should be opened, whose
valves may not produce vibracation and leakage toward outside. To the flow range that might make the reversed flow should prevent the
fluid’s reversed flow with fixing the check valve. Both sensor and pipeline should be concentric. The sealed washer

NYLD Turbine Flowmeter Connection Way

Turbine flow sensor/transmitter:(model NYLD-N, model NYLD-A )

1. Basic type:

NYLD-N type Turbine flow meter connection way

NYLD-A type turbine transmitter connection way

2. Anti-explosion type:

NYLD-N type turbine flow meter sensor connection way:

NYLD-A type turbine flow transmitter connection way:

Intelligent integration turbine flowmeter(model NYLD-C)

NYLD Turbine Flowmeter Application

NYLD-N basic type turbine flow meter:

This sensor has been calibrated and adjusted before sales, so needn’t examination.

The sensor conbines with displayer: in the first place, checking the output feature(the pulse frequent range,level,wide etc.) which should match the entry feature of displayer. The displayer parameters must set in terms of sensor factors. The sensor power , wire, and resistance must match each other as well.. In addition, the sensor’s prepositional amplifier must be considered to prevent from electromagnetic interference, for instance, to take action of rain proof.

NYLD-A turbine flow transmitter:

This transmitter should be set the flow rate output zero point and the full range value well according to the customer demand when purchasing.

When the flowmeter works on and the flow rate output zero point should be adjust on site, the operation method is doing as the follows:

Close the valves of flowmeter pipe, confirm there is not flow rate in pipe; put on the power, the series-connected current meter can monitor the flowmeter’s output current; slightly adjust the W502 potentiometer on the circuit board to come the output current back to 4m A.

Note: the flowmeter’s full range value couldn’t be adjusted on site after it works; If need, please return it to factory to complete that in the standard installation according to your need.

NYLD Turbine Flowmeter Cautions in Using

(1)The switch order putting into running
※The sensor that have not the branch pipe should slightly open up the half upstream valve, then the downstream valve. When running for a while through a small rate( about ten minutes), open the whole upstream valve and the downstream valve to the normal flowrate.
※The sensor with branch should first open the branch pipe valve, the half upstream valve, the downstream valve, close the branch valve to small flowrate, and running for a while. Then open the whole upstream valve, close the whole branch valve( be assure of no leak) , finally adjust the downstream valve to the needed flowrate.
(2)The low and high temperature fluid starts up
When low temperature fluid flows through the pipe, first the water should be expelled, then running for fifteen minutes with a minimum flow, and gradually rise to the normal flow. When stop flowing , also should gradually reduce to approaching pipe temperature and ambient temperature.
The high temperature fluid’s running is similar to this low one.
(3)Other notes:
1) Opening and closing the valve should be slow. If adopted the auto control switch, it is best to use “two open, two close” way to prevent the fluid against vane wheel to damage it.
2) Check the sensor’s downstream pressure to adopt measures to prevent cavitation.
3) For the sensor factors could appear to change should regularly calibrate away from pipe line. If the flow is not within the allowed range , sensor should be change .
4) Cleaning the pipe needs confirm to the standards of used flow direction,value,pressure,and temperature etc.,otherwise can make the accuracy fall,even damage.
5) Strengthen the check for sensor in order to assurance of long time normal working. As finding the unnormal , the measure should be taken. For instance, hearing the unnormal voice as monitoring the vane wheel rotation.

NYLD Turbine Flowmeter Problem and Solution

NYLD Turbine Flowmeter Transportation and Storage

The sensor should be put in the solid wooden box(small diameters can be put in carton) and cannot be free to wobble in the box. When carrying, it must be care to put down ,and refuse to load or unload crustily.
The location of reservation should be confirmed to the conditions as the following:
1.avoid rain and humidity;
2.avoid mechanical vibration and strike ;
3.temperature range:-20℃--+55℃;
4.relative humidity: not more than 80%;
5.ambient environment does not include corrosive gas.

Cautions in unpacking

When opening box, files and accessory should be complete. The files in the box include a user manual, a piece of test certificate, and a piece of packing list. The sensor should be observed whether it happens damage during transportation so that dealing with it well. Users must protect the certificate from loss otherwise the instrument factors cannot be set.

Necessary knowledge on order

User should notice that when ordering turbine flowmeter , the proper model specification should be chosen according to fluid’s nominal diameter, operating pressure, operating temperature, flow range, the fluid category and the surrounding condition. The anti-explosion type sensor should be chosen when having explosion-proof demand and noticing strictly the explosion-proof classes.
When the display instrument is matched by our company, please refer to the related instruction to choose your proper model or use our design of technological engineer for your choosing in terms of your information offering. The cable using in sending signal you want should provide the length and specification.
Intelligent integration of turbine flowmeter(NYLD-B/C NYLD-B/C)

Working condition Press “＞”,Entering the password input interface, Press“＜”bond, Approximately 1.2 seconds Start typing the password.
Set a password for 2010(Engineer Operation)Figure 2
Key Description:
Press“＜”Button(Press“＜”Button Approximately 1.2seconds Represents confirmation)
Press“+” Button(Press“＜”Button Approximately 1.2seconds It means exit)
Press“+” Button In the input state Cycle to change the value at the cursor
Press“＜” Button Move the current cursor position input
Press the input state“＜”, Passcodes The right to enter the menu , The Wrong Return to the initial state input

Instrument panel Operating Instructions