Flow Meter (Transmitter)

  • Model LRS Thermal Gas Mass Flowmeter
Model LRS Thermal Gas Mass Flowmeter

Model LRS Thermal Gas Mass Flowmeter

The thermal mass flowmeter is designed and manufactured on the basis of Kim's law, i.e. the principle of thermal diffusion. The so-called Kim's Law refers to the number of fluid molecules flowing through the superheat source in direct proportion to the amount of heat dissipation. There are two ways to realize this principle: one is the constant power method, the other is the constant temperature difference method. According to Gene's Law, mass flow Q can be obtained from the ratio of heating power to temperature difference of heat source. In practical work, we fix any parameter of heating power or temperature difference to measure the quality of fluid. The former is constant power method and the latter is constant temperature difference method. The thermal gas mass flowmeter manufactured by our company guarantees the consistency and reliability of the instrument through the application of the above principles and professional technology. The instrument has two sensors, one is the heat source and the other is the temperature of the medium. When the fluid flows, the molecular weight of the fluid flowing through the two sensors is proportional to the heat loss of the heat source. According to this relationship, the instrument calculates the mass flow rate of the gas through the electronic module. Since the instrument measures the mass of molecules in the fluid, it has nothing to do with the temperature and pressure of the medium, and the measured flow rate is the mass flow rate.

Features

Direct mass flow measurement without temperature and pressure compensation.

High precision measurements can also be obtained at low range.

Maximum range ratio to 1:1000, with leak detection function.

Short response time.

Pressure loss is negligible.

No movable parts, using aseismic design.

Easy installation and high economy.

Repeatability depends on the exact installation location.

Flow measurement for large caliber and regular pipes.

With Replacement Sealing Device, Online Installation and Replacement.

Multiple diagnostic functions.

Integrated or split type optional.

Setting of Different Gas Coefficient and Matching of Intelligent Digital Flow Totalizer

Application

Application in metallurgical industry: Blast furnace gas, coke oven gas measurement, steel aeration measurement, steel rolling gas measurement and control, process control of hydrogen, oxygen, nitrogen and other gases such as heat treatment quenching furnace, and various gases in steel plant to measure air, N2, O2, H2, CH4, He, CO2, NH3, natural gas etc. Advantages: simple installation, easy cleaning, high range ratio, low pressure loss, high accuracy.

Petrochemical industry applications: torch gas emission, flue gas, ammonia measurement in fertilizer plants. Advantages: Good small flow sensitivity, high range ratio, easy disassembly and cleaning.

Power industry applications: measurement of primary and secondary air in power plants; monitoring of SO2 and NOX emissions from flue gas exhaust, measurement of gas-assisted and preheated air supply in boilers, control of pulverized coal combustion process and hydrogen measurement of steam turbines in power plants when hydrogen is generally used as cooling material. Advantages: No moving parts, no pipeline blockage, high cost performance, low pressure loss, high range ratio.

Glass, ceramics and building materials industry applications: gas furnace intake control, Control of Hot Air Flow from Vertical Mill in Cement Industry. Advantages: Direct mass flow monitoring, high accuracy and calibration according to actual components.

Food and beverage industry, pharmaceutical industry applications: carbon dioxide treatment in breweries, waste gas flow monitoring in fermentation containers, fresh air addition in food processing operations, hot air flow monitoring in bottle disinfection in pharmaceutical industry. Advantages: Excellent low flow sensitivity, direct mass flow monitoring, high accuracy.

Application of water, wastewater and water treatment: measurement of biogas and ventilated air, measurement of air flow in aeration tank. Advantages: dirt resistance, dust resistance, easy installation, easy disassembly and cleaning.

Manufacturing Applications: Compressed Air Measurement, Leak Point Detection, Ratio of N2, O2 and Ar in Air Separation Unit, Fuel Cell Plant Gas Flow Measurement, Laboratory High Purity Gas Measurement. Advantages: no temperature and pressure compensation, excellent low flow sensitivity, mass flow monitoring, High range ratio, low pressure loss.

Technical Parameters

Measuring Medium

Various gases (except acetylene)

Caliber Range

DN10~100mmFull tube type

DN80~6000mmInsertion type

Velocity Range

0.5~100Nm/s

Accuracy

±1.0%

Operating Temperature

Sensors: Normal temperature type - 10 ~ 200 , High temperature type: - 10 ~ 350 , Converter: - 20 ~ 45

Operating Pressure

Medium pressure 10Mpa

Medium pressure 2.5Mpa

Power Supply

IntegratedDC 24V or AC220V18WSplit-typeAC220V19W

Speed Of Response

1S

Output Signal

4~20mA (Photoelectric Isolation, Max Load 500Ω) RS485Photoelectric Isolation , Hart protocol

Pipe Material

Carbon steel, stainless steel, plastics, etc.

Display

LCD

Show Contents

mass flow, Standard condition Volume flow, Cumulative flow, standard time, Cumulative running time, medium temperature, standard velocity, etc.

Protection Class

IP67

Sensor Material

Stainless steel

Stainless steel, carbon steel

Note:

1. If the medium pressure is greater than 4MPa, it should be customized through consultation with the manufacturer.

2. The plug-in process is connected by locking device/ball valve, and the pipeline process is connected by flange or thread.

3. The expanding range of flow rate of medium measured by the product can reach 0.1-100Nm/S. From this, the flow measurement range of products with different pipe diameters can be deduced. The formula is: flow rate=(flow rate*(pipe diameter mm)²)/353.8.

Upper Limit Of Range (Scalable, unit: Nm³/h)

Calibermm

Air

NitrogenN2

Oxygen

O2

HydrogenH2

15

65

65

32

10

25

175

175

89

28

32

290

290

144

45

40

450

450

226

70

50

700

700

352

110

65

1200

1200

600

185

80

1800

1800

900

280

100

2800

2800

1420

470

125

4400

4400

2210

700

150

6300

6300

3200

940

200

10000

10000

5650

1880

250

17000

17000

8830

2820

300

25000

25000

12720

4060

400

45000

45000

22608

7200

500

70000

70000

35325

11280

600

100000

100000

50638

16300

700

135000

135000

69240

22100

800

180000

180000

90432

29000

900

220000

220000

114500

77807

1000

280000

280000

141300

81120

1200

400000

400000

203480

91972

1500

600000

600000

318000

101520

2000

700000

700000

565200

180480

Standard condition:TEMP 20℃,PRESS 101.325KPa

Unit Options for Instantaneous Flow: Nm³/h, L/h, L/min, t/h, t/min, kg/h and kg/min.

Installation Method

Insert installation:

1. Position determination: Keep away from elbows, solenoid valves and other parts to ensure steady flow field.

2. Welding base: drill a circular hole of 22mm on the pipeline and weld the welding base.

3. Installation Instrument: Insert the locking head into the probe rod and tighten it with a wrench after confirming the insertion depth.

4. Recommends that users use Globe valve in the selection, Easy disassembly. Especially in the media sites which are harmful to human body.

5. Diameter less than DN300, insertion depth 1/2D+15mm. Diameter DN300~DN1000, insertion depth 1/4D+15mm. Diameter above DN1000, insertion depth 1/8D+15mm.

Pipe section installation method:

Horizontal and vertical installation. The special flange is welded with the front and rear straight pipe sections, and then the front and rear straight pipe sections, sealing gaskets and instruments are clamped with double-headed bolts to form a whole. Then install this set of components on the pipeline. When installing, attention should be paid to the direction marked on the instrument should be consistent with the direction of the fluid.

Ordering Codes

Model

Description

LRS

 

Thermal Gas Mass Flowmeter

Sensor Type

C

Insertion type

FG

Flange pipe section type

LG

Thread pipe section type

J

Clamping type

Caliber (mm)

Pipe inner diameter :10-6000mm

 

The square pipe provides side length:25*25-2000*2000

Material

A

316SS

B

304SS

C

201SS

D

Anticorrosive coating

E

Other materials

PRESS (Mpa)

S

1.6

M

1.62.5

H

4

TEMP ()

-40200

-40450

Output Signal

1

4-20mA

2

RS485

3

pulse

4

Relay N.O. contact

5

4-20mA+HART protocol

Power Supply

DC

24VDC

AC

220VAC

Display

J

Local display

S

Split display