Liquid turbine flowmeterLMW100 series

technical parameters

△operative norm：△Meter diameter（mm）and

connection mode：△accuracy class：△Range ratio：△sensor material：△service conditions：

△signal output function：△communication output function：△Operating power：

△signal line interface：△Protection class：

Turbine flow sensor（GB/T9246-1999）threaded connection for 4、6、10、15、20、25、32、40 flange connection for（15、20、25、32、40）50、65、80、100、125、150、200 ±1%R、±0.5%R、±0.2%R（special customized）1:10；1:15；1:20304 SS、316（L）SSmedium temperature：-20℃~+120℃ Ambient temperature：-20℃~+60℃relative humidity：5%~90% barometric pressure：86Kpa~106Kpapulse signal、4~20mA signalRS485communication、HART protocol A. external power：+24VDC±15%, ripple wave≤±5%，suitable for 4-20mA output、 pulse output、RS485, etc..B. internal power：one set of 3.0V10AH lithium battery，normal operation for battery voltage of 2.0V~3.0V. Basic type：Hersman connector or self –equipped three-core cable;female threadM20×1.5IP 65 or higher（as requested）

basic parameters

Principle

LMW100 Series turbine flowmeters are new generation of turbine flowmeter with simple structure, light weight, high precision, perfect reproducibility, sensitive response, easy installation and maintenance. They are widely used to measure the liquids with kinematic viscosity of less than 5 × 10-6 m2 / s at operating temperature in closed pipes and the pipes which have no corruption for stainless steel 1Cr18NI9Ti, 2Cr13, steel pressed Al2 O3 and cemented carbide without impurities such as fiber and particles. For the liquids with kinematic viscosity of greater than 5 × 106 m2 / s, the flowmeters can be used after actual liquid calibration. If they are used together with display instruments with special functions, they can also be used for quantitative control and excessive alarm so they are the ideal meters for flow measurement and energy saving.When the measured fluid flows through the sensor, the wheel rotates by force under the action of fluid. The rotational speed of wheel is proportional to the average flow rate in the pipe. The rotation of wheel changes the magnetic resistance value of magnetoelectricity convertor periodically. The flux bearing in detecting coil changes periodically to generate periodic induced electromotive force, i.e. electric pulse signals which are amplified by the amplifier then sent to the display meter. The flow range of turbine flowmeter can be divided into two categories: practical flow range and theoretical flow range.

睹1）Practical flow equationq y =f/K q m =q y p Whereinqy2 qm ⋯⋯are volume and flow rate respectively，m3 /s，mass flow rate，kg/s； y2 mf⋯⋯frequency of output signal for flowmeter，Hz； K⋯⋯meter factor for flowmeter, P/m3 .The relation curve of factor and flow (or pipe Reynolds number) for flowmeter. Meter factors can be divided into two segments, namely linear and non-linear segments.Linear segment is about two-thirds of its work segment and its characteristics are related to the structure size of sensor and the fluid viscosity. At non-linear segment, the features are greatly affected by bearing friction and fluid viscosity resistance. When the flow rate is below the lower flow limit of sensor, the meter factors vary rapidly with flow rate. The relation between pressure loss and flow rate is approximately square. When the flow rate exceeds the upper flow limit, cavitation must be prevented. TUF characteristic curves with similar structure are similar and they only differ in the level of system error.The meter coefficients of sensor are calibrated by flow calibration device to generate. They completely do not inquiry the internal fluid mechanism within sensor. The sensor is regarded as a black box and its conversion coefficients are determined according to input (flow rate) and output (frequency pulse signal) for practical application. However, it should be noted that the conversion coefficients (meter coefficients) are conditional and their calibration conditions are referenced. The coefficients will change if the conditions are deviated in operation. The change depends on sensor type, pipeline installation conditions and physical parameters of fluid.

（2）theoretical flow equationThe motion equation of vane can be listed according to moment of momentum theorem WhereinJ： inertia moment of vane；dw/dt：rotational acceleration of vane；M1 ：driving torque of fluid； M2 ：Viscous resistance torque； M3 ：bearing friction resistance torque； M4 ：magnetic resistance torque。When the vane rotates at constant speed, then M 1=M2 +M 3+M4, the following equation can be achieved through theoretical analysis and experimental verification

Whereinn：rotating speed of the vane；q ：volume flow rate； vA: factors related to fluid properties (density, viscosity, etc.), structural parameters of vane (vane dip angle, vane diameter, cross-sectional area of flow channel, etc.);

B: coefficients related to bottom clearance of vane and velocity distribution of fluidC: coefficients related to friction torqueMany theoretical flow equations have been put forward in the world and they are suitable for various sensor structures and working conditions of fluid. So far the hydrodynamic characteristics of turbine meters have not been very clear and they have complex relationship with fluid properties and flow characteristics. For example, the hydrodynamic characteristics are very complex when there are vortexes and asymmetric velocity distribution at the scene. The meter coefficients cannot be deduced from theoretical equation but still determined by actual flow calibration. However, the theoretical flow equation has great practical sense and can be used to guide the design of structure parameters for sensors and predict and estimate the change rules of meter coefficients when field use conditions are changed.

Features

●High accuracy generally up to ±1%R, ±0.5R and high precision type up to ±0.2%R●Perfect repeatability and short-term repeatability up to 0.05%~0.2%. Precisely because of good repeatability, high accuracy can be obtained if performing frequent online calibration.Preferred flow meter for trade settlement. ●Output pulse frequency signal, suitable for gross measurement connecting to computer without zero drift, strong anti-interference capability;●High frequency signals (3 ~ 4KHz) can be obtained with strong signal resolution;●Wide range with medium-large caliber up to 1：20 and small caliber of 1：10;●Compact and light and easy for installation and maintenance with strong flow capacity；●Suitable for high pressure measurement without having openings on the meter body to make high-pressure meter easily;● Various types of special sensors which can be designed according to special needs of customers, such as low temperature type, two-way type, downhole type and special sand mulling type;● Insertion type can be made suitable for measurement of heavy caliber with low pressure loss and price. Can be taken out without stopping flow and easy for installation and maintenance.

Application

Typical application：liquids without impurities or strong corrosion, such as water, diesel and formaldehyde.

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Measuring range and operating pressure Table 1

Meter diameter(mm)

Normal flow range(m3/h)

D N 6

D N 1 0

D N 1 5

D N 2 0

D N 2 5

D N 3 2

D N 4 0

D N 5 0

D N 6 5

D N 8 0

D N 1 0 0

D N 1 2 5

D N 1 5 0

D N 2 0 0

1 ~ 0 . 6

0 . 2 ~ 1 . 2

0 . 6 ~ 6

0 . 8 ~ 8

1 ~ 1 0

1 . 5 ~ 1 5

2 ~ 2 0

4 ~ 4 0

7 ~ 7 0

1 0 ~ 1 0 0

2 0 ~ 2 0 0

2 5 ~ 2 5 0

3 0 ~ 3 0 0

8 0 ~ 8 0 0

threaded connection /6.3MPa

threaded connection /6.3MPa

threaded connection /6.3MPa

threaded connection /6.3MPa

flange connection /2.5MPa

threaded connection /6.3MPa

flange connection /2.5MPa

threaded connection /6.3MPa

flange connection /2.5MPa

threaded connection /6.3MPa

flange connection /2.5MPa

threaded connection /6.3MPa

flange connection /2.5MPa

flange connection /2.5MPa

flange connection /2.5MPa

flange connection /2.5MPa

flange connection /1.6MPa

lange connection /1.6MPa

flange connection /1.6MPa

flange connection /1.6MPa

1 0、1 6、2 5

1 0、1 6、2 5

1 0、1 6、2 5

4 . 0、6 . 3、1 0、1 6、2 5

4 . 0、6 . 3、1 0、1 6、2 5

4 . 0、6 . 3、1 0、1 6、2 5

4 . 0、6 . 3、1 0、1 6、2 5

4 . 0、6 . 3、1 0、1 6、2 5

4 . 0、6 . 3、1 0、1 6、2 5

4 . 0、6 . 3、1 0、1 6、2 5

4 . 0、6 . 3、1 0、1 6、2 5

2 . 5、4 . 0、6 . 3、1 0、1 6、2 5

2 . 5、4 . 0、6 . 3、1 0、1 6

2 . 5、4 . 0、6 . 3、1 0、1 6

2 . 5、4 . 0、6 . 3、1 0、1 6

Extension flow range(m3/h)

Regular connection mode and pressure- resistant class

0 . 0 6 ~ 0 .6

0 . 1 5 ~ 1 .5

0 . 4 ~ 8

0 . 4 5 ~ 9

0 . 5 ~ 1 0

0 . 8 ~ 1 5

1 ~ 2 0

2 ~ 4 0

4 ~ 7 0

5 ~ 1 0 0

1 0 ~ 2 0 0

1 3 ~ 2 5 0

1 5 ~ 3 0 0

4 0 ~ 8 0 0

Type selection table

Description 型号

L M W 1 0 0 -

//

/////////

////

46

1 01 52 02 53 24 05 06 58 0

1 0 01 2 51 5 02 0 0

/□□ /□ /□ /□ /□/□

/

/

/

/

/

/

1

2

3

4

5

6

/

/

/

2

5

1 0

/

/

W

S

/

/

0 4

1 6

/

/

N

H（ x）

4 m m

6 m m

1 0 m m

1 5 m m

2 0 m m

2 5 m m

3 2 m m

4 0 m m

5 0 m m

6 5 m m

8 0 m m

1 0 0 m m

1 2 5 m m

1 5 0 m m

2 0 0 m m

Sensor type：+12V or 24V power， pulse signal of three-wire system output

Transmitter type：+24V power， 4~20mA of two-wire system output

Intelligent type：lithium battery power，site display without signal output

Intelligent type：+24V power，site display with 4~20mA of two-wire system output

Intelligent type：+24V power，site display with RS485communication output

Intelligent type：+24V power，site display with HART communication protocol

0.5 level

1.0 level

Extension measuring range

Standard measuring range

304 SS

316（L）SS

Regular pressure（refer to Table 1）

high pressure（refer to Table 1）

0.2 level（consultation for ordering with long production phase）

Regular connection mode and pressure- resistant class

Special pressure- resistant class(Flange clamp mounted)

DN4

Type Description

0.40-0.25 0.04-0.4

■Intelligent integrated turbine flowmeterThe turbine flow sensor developed using the technology of advanced single-chip microcomputer with ultra-low power consumption and the new intelligent meter with integration of display and integrating adopt double LCD of on-site display. They have the obvious advantages of compact structure, intuitive and clear readings, high reliability, free of external power interference, anti-lightning and low cost. The meter has three-point correction for meter factors and nonlinear for meter factors of intelligent compensation as well as on-site correction. High-definition LCD displays instantaneous flow rate (four significant figures) and cumulative flow rate (8 significant digits with reset function). All valid data can be kept for 10 years in case of power failure.This kind of turbine flowmeters can be divided into LMW100-B type and LWM100-C type in accordance with power supply and the availability of remotely transmitting signalsLMW100-B type: Power supply uses 3.0V10AH lithium battery (continuous operation for more than 4 years without signal output function).LMW100-C type: Power supply uses 24VDC external power supply, standard two-wire, three-wire or four-wire current signal of output 4-20mA, or 1 ~ 5V voltage signal, and RS485 or HART communications can be added according to different site needs.

Instrument category

1. LMW 100 series turbine flowmeter can be divided into the following two kinds based on their functions: Turbine flow sensor/transmitterIntegrated intelligent turbine flowmeter 2. Function descriptionTurbine flow sensor/transmitter This turbine flow product is only able to transmit and output the flow signal without the function of on-site display. The flow signal can be divided into pulse signal or current signal (4-20mA); It has a reasonable price, but its integration level is high. It is small. It is especially applicable to be used in combination with the secondary display instrument and computer control systems such as PLC, DCS. It can be divided into LMW100-N and LMW100-A based on the output signal. LMW100-N sensor: power supply: 12 ~ 24VDC, three-wire system pulse output, high electrical level ≧ 0.8V; low electrical level ≦ 0.8V; signal transmission distance ≦ 1000m

Pulse width = LMW100-A transmitter: power supply: 24VDC, two-wire system 4-20mA, output, signal transmission distance ≦ 1000m. ;

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