BX-LWQ-C dual power supply temperature and voltage compensation 1.0 grade aluminum alloy material


Introduction to gas turbine flowmeter:
A new intelligent instrument for turbine flow sensor developed using ultra-low power single-chip microcomputer technology. This type of turbine flowmeter has a complete and compact structure, convenient, intuitive and clear readings, strong reliability, is not easily obstructed by external power sources, is resistant to lightning strikes, and is cost-effective.
A natural gas flowmeter is one of the types of impeller flow meters. The turbine flowmeter consists of a sensor and a conversion display device. The sensor of the turbine flowmeter uses a multi blade rotor, which is used to sense the average velocity of the fluid. The turbine flowmeter then derives the flow rate and total amount of the medium. The rotational speed of the turbine flowmeter rotor can be detected by mechanical, electromagnetic induction, and photoelectric methods, and the turbine flowmeter displays and transmits records based on the reading device. Turbine flowmeter is a high-precision and fast response flowmeter. Nowadays, turbine flowmeters have been widely used in oil plants, chemical plants, research laboratories, the Ministry of National Defense, and various metrology departments.

Advantages of natural gas flow meters:

1. Natural gas flowmeter is one of the three types of industrial instrument products with high repeatability and accuracy, while turbine flowmeter has its own characteristics.
The lightweight structure of turbine flowmeter is not complex, with few parts, light weight, wide flow capacity, and can adapt to high usage parameter requirements. Turbine flow meters have strong anti-interference ability and strong anti impurity ability. Turbine flow meters can release suspended debris in the fluid at any time during rotation, and have strong anti-interference and anti vibration capabilities.
2) The structural principles of the sensors and displays of the turbine flowmeter are very clear and understandable, making it particularly easy for customers to master their usage and maintenance techniques.
4) After replacing the impeller and bearings, the instrument coefficient of the turbine flowmeter remains unchanged.
5) The measurement range of turbine flowmeter is wide, and the lower limit flow rate is low.
6) The measurement error of the fluid is small.
7) Almost no pressure loss, can save energy consumption.
8) Sensors can be installed and used outdoors. It has waterproof function, and the entire turbine flowmeter sensor can be submerged in water for a long time.
9) Sensors with shut-off valves do not require flow interruption during the installation and disassembly of turbine flow meters.
10) Natural gas flow meters can be used in a wide range of environments, including horizontal, vertical, and inclined pipelines.


1、 Overview
The LWQ series gas intelligent turbine flowmeter is a new generation of high-precision and highly reliable precision measuring instrument developed by our company in accordance with the GB/T32021-2015 standard and combined with domestic and foreign flow instrument technology. It integrates temperature, pressure, flow sensors, and intelligent flow integrators. With low and high pressure measurement performance, multiple signal output methods, and low sensitivity to fluid disturbances, the LWQ series flowmeter has become a commercial trade measuring instrument that can accurately measure gas accumulation.
This flowmeter is widely used in the measurement of urban pipeline (network) gas, industrial gas, gas pressure regulating stations, energy management, and the measurement or flow control of various non corrosive gases.
The explosion-proof mark is ExdIICT6Gb (explosion-proof type), ExdIIBT4, ExiaIICT4, (Intrinsic safety type). Suitable for Class IIA, IIB, IIC, T1~T2 temperature group explosive gas mixtures in Zone 1.2 hazardous areas (intrinsically safe only).
2、 Main features
Meet the technical requirements of GB/T32021-2015 standard to detect the temperature, pressure, and flow rate of the tested gas, perform automatic flow tracking compensation and compression factor correction, and display the accumulated gas volume under standard conditions (Pb=101.325KPa, Tb=293.15K);
Wide flow range (Qmin/Qmax=20:1), good repeatability, high accuracy (up to 1.0 level), low pressure loss, and low initial flow rate;
It has the function of setting eight instrument coefficients and automatic correction;
Using a dedicated integrated rectifier, the installation requirements for the front and rear straight pipe sections of the flowmeter are low (≥ 2DN for the front, no requirements for the downstream);
Built in pressure and temperature sensors, high safety performance, compact structure, and beautiful appearance;
Capable of self diagnosing faults in pressure and temperature sensors and displaying them directly on the LCD screen;
A lithium battery can be used continuously for more than five years and has a two-level alarm output function for battery undervoltage, which is more suitable for use with IC card management systems;
The intelligent flow integrator can be positioned at any angle (with a rotation angle of 350 °), making the reading of the flow meter more convenient and direct under various installation conditions;
The unique functions of time display and real-time data storage ensure that internal data will not be lost and can be saved continuously under any circumstances;
The instrument has RS-485 communication interface function and is equipped with a powerful and rich interface data management software system, which can print various automatically generated charts;
The instrument has explosion-proof and protective functions, with the explosion-proof mark of Exd Ⅱ BT6Gb and a protection level of IP65
According to user requirements, the function of setting pressure and temperature settings can be provided, which is particularly suitable for situations where the medium force and temperature are relatively stable
3、 Model specifications and basic parameters of flow meters (Table 1)

model	Nominal Diameter DN( mm )	Start flow rate ( m3/h )	Flow range ( m3/h )	Pressure level （MPa）	housing material	accuracy (Level)
LWQ-25	DN25(R1)	≤0.8	2.5～25	1.6 2.5 4.0	stainless steel aluminium alloy	When the accuracy level is 1.0, the allowable error is: Qmin～0.2Qmax:±2% 0.2Qmax～Qmax:±1% When the accuracy is at level 1.5, the allowable error is: Qmin～0.2Qmax:±3.0% 0.2Qmax～Qmax:±1.5%
	DN25(R2)	≤1.3	5~50
LWQ-32	DN32(R1)	≤1.3	4~40		stainless steel
	DN32(R2)	≤1.5	6~60
LWQ-40	DN40(R1)	≤1.1	5~50
	DN40(R2)	≤1.5	6~60
LWQ-50	DN50(R1)	≤1.5	6~65		stainless steel aluminum alloy
	DN50(R2)	≤2.0	10~100
	DN50(R3)	≤3.0	10~160
LWQ-65	DN65(R1)	≤2.0	10~100		stainless steel
	DN65(R2)	≤5.0	13~250
LWQ-80	DN80(R1)	≤3.5	8~160		stainless steel aluminum alloy
	DN80(R2)	≤5.0	13~250
	DN80(R3)	≤6.0	20~400
LWQ-100	DN100(R1)	≤5.0	13~250	1.6 2.5 4.0	stainless steel aluminum alloy
	DN100(R2)	≤9.0	20~400
	DN100(R3)	≤15.0	32~650
LWQ-125	DN125	≤15.0	40~800		stainless steel
LWQ-150	DN150(R1)	≤10.0	32~650
	DN150(R2)	≤14.0	50~1000
	DN150(R3)	≤16.0	80~1600
LWQ-200	DN200(R1)	≤14.0	50~1000	1.6 2.5	stainless steel
	DN200(R2)	≤20.0	80~1600
	DN200(R3)	≤25.0	125~2500

(Table 1)

Note: The flow range listed in the table is the flow range during product factory inspection (at room temperature and atmospheric pressure, ρ=1.205 kg/m)³）；
② As the pressure increases, the flow range also expands;
③ R1, R2, and R3 represent the flow ranges of small, medium, and large for the same caliber, respectively;
④ Unless otherwise specified, all products are manufactured at level 1.5;
⑤ Please specify other flow ranges when placing an order;
4、 The external dimensions of the flowmeter
The flowmeter adopts a flange connection method, and the flange size follows the GB/T 20592-2009 standard of the Ministry of Chemical Industry. The appearance of the flowmeter is shown in Figure 4, and the dimensions are listed in Table 2 (this table shows the flange size at PN1.6MPa).