Orifice Flowmeter

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Specifications

 LBJ diferential pressure flowmeter: LBJ flowmeter

The product satement

The production introduction

The industrial steam as the secoundary energy are very widely used. It has the very important economic meaning for the accurate measurement of the industrial steam, and also it is the main segment for commencing the energy-saving work. There are a big amount of measuring problems of the industrial stream in the lots of industries, such as oil,chemical, light industry, metallury, textile, food, and medicine etc..Especially the coutry implement central heating policy, which require insistently to settle the problems of the accurate measuring of the large pipe and large flow of the industrial steam. For satisfying the needs of the industrial productioon, our company produce the LBJ series measuring equipments for the big diameter and big flow rate( thereinafter calling equipment), the appliable diameter specifications are Dg50,Dg80,Dg100,Dg150,Dg200,Dg250,Dg300,Dg350,Dg400,Dg450,Dg500,Dg600.

The measureing range of the equipments are wide, the reading accurately cooperate, which are the best flow measuring equipment in the domestic market. The equipments are mainly applied in the measuring of saturated vapour, overheating vapour, compressed air, and the mixed gas nonflammablely and nonexlosively. The equipments could be applied for the above mentioned flow measurement, display, meter and the online autocontrol of the producing process etc

The product features

The equipment make the most advantage of the classic the throttle element and smart flow meter with high accuracy, and through the design method, it adopts the actually operable adjustment method and electric technology to make the usability of the equipment owing the distinctive quality. Now the overviews are as followed:

1. The equipment tracks the magnitude change of the pipe flow rate, and increase the measuring accuracy largely.

2. The throttle element applied by the equipment is specially designed according o the international users supplying the technology conditions and make the reading more accurate and reasonable under the change scope of the scheduled pressure, temperature and flow rate.

3. The equipment adopts the hole plate angle connecting to the ring casing or flange to measure the pressure,

Thereinto, the applicable diameter of the flange for measuring the pressure is Dg450-600, with the features of high-temperature and high pressure resistance, and it is applicable to all kinds of calculations of large diameter and flow rate.

4. The equipment is easy to use, the reading is intuitive and no need to converse; And the equipment has strong complete set, and it is easy to maintenance, examine and manage.

5. For guaranteeing the measurement accuracy and being convenient for the users, the throttle elements has upstream and downstream measuring pipe and installation part.

6. The design of the equipment is rigorous, and the structure is reasonable, possessing the good performances of heat proof, moistureproof and shockproof to ensure the long term work stably.

The main technical parameters

1.The equipment model number

LBJ- the first character of Chinese Pinyin, symbolizes automatic compensation type flow equipment.

LBJ- x y z

X- symbolizes the specification of the pipe diameter.

Y-symbolizes the measured medium

Z-symbolizes the upper limit of the pressure range(the meter pressure)

x.y.z adopt the digit to symbolize the meanings as followed:

X

00 – Dg50       01 – Dg80         02 – Dg100

03 – Dg150       04 – Dg200       05– Dg250

06 – Dg300       07 – Dg350       08– Dg400

09 – Dg450       10 – Dg500       11 – Dg600

Y

1-overheating stream   2. saturated stream     3-gas

4-water

Z

00 – 0.4Pa       01 – 0.6Pa       02 – 0.8Pa

03 – 1.0Pa       04 – 1.3Pa       05 – 1.6Pa

06 – 2.0Pa       07 – 2.5Pa       08 – 3.0Pa

09 – 4.0Pa       10 – 6.0Pa       11 – 8.0Pa

12 – 10.0Pa

For example: the LBJ-124 type is one saturated stream equipment with Dg80 and the 1.3Mpa pressure upper limit.

2. The measurement range

a. the measuring range of the flow rate.

0-100(T/h) vapor

0 -100000(M³/h) compressed steam(working condition)

b. the measuring range of the pressure

0-10(Mpa) vopor hot water

0-2(MPa) compressed air

c, the measuring range of the temperature

0 °C- 370°Chot water

100°C - 370°Csaturated steam
100°C - 600°Coverheating steam

0 - 90°C compressed air

3.the pipe diameter:

Dg50,Dg80,Dg150,Dg200,Dg250,Dg300,Dg350,Dg400,Dg450,Dg500,Dg600

It is discussed separately for other pipe diameter users.

4.The measuring accuracy

±1%

5.Using conditions

a.the surrounding temperature is 0-45°C

b. the relative humidity of the air is not above 85%.

c. the working shake frequency is not above 25Hz, and the swing is not above 0.1mm(complete swing)

d. it should not have the corrosive gas in the surrounding air.

The time affect of the electrical applicance control ≤15ms

7.the electric power source

220 -50Hz  Permitting change of the voltage

8.Circuit signal of the output flow

0-10mA, 4-20mA,DC With the load ability   0-1500Ω constant flow property.

9. the circuit signal of the output pressure:

With the load ability 0-1500Ω constant flow property. 0-10mA,4-20mA,DC extension need to be added the socket connector.

10. consumed power: ≤ 30 VA

The working principle

The working principle of the equipement

When the fluid flow through the throttle element, the differential pressure is produced at the upstream and downstream sides. If the geosim and kinematic similarity of the unnorminal throttle equipment is same as the normnal throttle equipment after completely tested, at the known conditions of the relative parameter, there is the definite value relationship between the static pressure difference and the fluid flow rate flowing. The practical equotion of calculating the flow rate when the fluid flows the throttle equipment.

q_m = 0.01251.α.ε.d² 20   (kg/h) (1)       q_v = q_m/p

In the equotion: q_m the mass flux     kg/h

q_v the resistance value under the condition state.; αthe resistance value under the working state.; ε the swell factor when the fluid passes the throttle equipment; p the fluid density: kg/m³;

The differential pressure mmH₂O

D₂₀ the ringent diameter of the throttle element

When The differential pressure, pressure P examined by the sensing part is assembled by the primary instrument, and is changed into the relevant electrical signal by the differential pressure transmitter and the pressure transmitter, at the same time output the platinic thermal resistance Pt to the secondary instrument, and then the relevant flow rate q_m is calculated out by the secondary instrument.

The use method

The matters need attentions before the equipment put into operation. 1. the connecting pipe system are injected with cold water as the transmission medium.

Measuring the high temperature vapor generally transmit the pressure through the cold water. Under the condition that the vapor does not be delivered in the pipeline, open the primary valve, pressure valve and balance valve, close the wash water valve, directly inject the cold water to the drainer by the tender filling hole, until the drainer is full. Of course, it also could close the balance valve and pressure valve, open the primary valve to import high temperature vapor which slowly condense to the water. Due to the too high temperature vapor which could easily damage the instrument, generally it is not adopted. Especially pay attention when measuring the high temperature vapor, the instrument is strictly forbidden to put into work when the connecting pipe is injected fully with water or the temperature is very high. To measure compressed air, cold water directly adopt the measured medium to transmit the pressure.

2.   adjust the null drift of the pressure transmitters

operation is that it could operate after the connecting pipe injects with

interference.

2. The maintemance of the equipment

consultant services.