The DC-LWQ series gas intelligent turbine flowmeter is a new generation of high-temperature, pressure, flow sensor and intelligent flow totalizer developed by our company in accordance with GB / T18940-2003 standard and combined with advanced technology of domestic and foreign flow meters. Precision, high-reliability precision metering instrument, its excellent low- and high-pressure metering performance, multiple signal output methods, and low sensitivity to fluid disturbances, make the DC-LWQ series flowmeters a special type that can accurately measure gas accumulation Volume of commercial trade measuring instruments. Guangzhou Dichuan Instrument Co., Ltd. Consulting Tel: 020-85628522
This flow meter is widely used in: urban pipeline (network) gas measurement, industrial gas measurement, gas pressure regulation station measurement, energy management, and other various non-corrosive gas measurement or flow control and other occasions.
This product has been certified by the National Explosion-proof Product Quality Inspection Department according to GB3836-2000 "Electrical Equipment for Explosive Gas Environments Part 1:
General Requirements ", GB3836.2-2000" Electrical Equipment for Explosive Gas Environments Part 2: Explosion-proof Type "d" "and GB3836.4-2000" Electrical Equipment for Explosive Gas Environments Part 4: Intrinsically Safe "i" 》 The standard inspection is qualified, and the explosion-proof marks are ExdIIBT4 (explosion-proof type), ExdIIBT4, ExiaIICT4, (intrinsically safe type). It is suitable for hazardous locations in Zone 1.2 (only intrinsically safe type) containing explosive gas mixtures of temperature groups T1 ~ T2 of IIA, IIB, IIC.
Second, the main characteristics meet the technical requirements of the GB / T18940-2003 standard, the length of the meter body is 3DN (DN is the flowmeter diameter), and after high,
Low level disturbance test;
It can detect the temperature, pressure and flow of the measured gas, can perform automatic flow tracking compensation and compression factor correction, and display the cumulative 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), small pressure loss, and low initial flow;
With eight-segment meter coefficient setting and automatic correction function;
Special integrated rectifier is adopted, which has low requirements for the installation of front and rear straight pipe sections of the flowmeter (previously ≥ 2DN, no downstream requirements);
Built-in pressure and temperature sensors, high safety performance, compact structure and beautiful appearance;
The pressure and temperature sensors can be diagnosed by themselves and displayed directly on the LCD screen;
One lithium battery can be used continuously for more than five years, and has two-level alarm output function for battery undervoltage, which is more suitable for supporting the use with IC card management system;
The intelligent flow totalizer can be positioned at any angle (the rotation angle is 350 °), which makes the reading of the flow meter under various installation conditions more convenient and direct;
Unique time display and real-time data storage function, no matter what the situation, can ensure that the internal data will not be lost and saved;
The meter has the RS-485 communication interface function, and is equipped with a powerful and rich interface data management software system, which can print each automatically generated chart;
The instrument has explosion-proof and protection functions. The explosion-proof mark is ExdⅡBT6Gb, and the protection grade is IP65.
According to user requirements, it can provide pressure and temperature setting functions, especially suitable for occasions with medium force and relatively stable temperature.
3.1 Standards and certification implementation standards GB / T18940-2003 national standards;
Meets the prEN 12261 European Community standard;
Implementation of JJG1037-2008 "Turbo Flowmeter Verification Regulations".
3.2 accuracy class
All flowmeters have a large allowable error of ± 1.0% or ± 1.5% (that is, accuracy class 1.0 or 1.5) within the specified flow range. When the minimum flow rate is less than 0.2Qmax, it is within the range of Qmin ～ 0.2Qmax. The large allowable errors are ± 2.0% or ± 3.0%, respectively.
3.3 Operating conditions Ambient temperature: -30 ℃ ～ + 60 ℃;
Medium temperature: -30 ℃ ～ + 80 ℃;
Atmospheric pressure: 86KPa ～ 106KPa;
Relative humidity: 5% ～ 95%
3.4 Mechanical performance index
3.4.1 Model specifications and basic parameters of the flow meter (Table 1)
Model Nominal diameter
DN (mm) starting flow
(m3 / h) Flow range
(m3 / h) Pressure grade (MPa) Housing material Accuracy
DC-LWQ-25A 25 ≤0.8 2.5 ～ 25
When the accuracy is 1.0, the allowable error is:
Qmin ～ 0.2Qmax: ± 2%
0.2Qmax ～ Qmax: ± 1%
When the accuracy is 1.5, the allowable error is:
Qmin ～ 0.2Qmax: ± 3.0%
0.2Qmax ～ Qmax: ± 1.5%
DC-LWQ-25N ≤1.3 5 ～ 50
DC-LWQ -40A 40 ≤1.1 4 ～ 50
DC-LWQ -40N ≤1.5 6 ～ 65
DC-LWQ -50A 50 ≤1.5 4 ～ 65
DC-LWQ -50N ≤2.0 10 ～ 100
DC-LWQ -80A ≤5.0 13 ～ 250
DC-LWQ -80N ≤6.0 20 ～ 400
DC-LWQ -100A ≤9.0 20 ～ 400
DC-LWQ -100N ≤15.0 32 ～ 650
DC-LWQ -150A 150 ≤10.0 32 ～ 650
DC-LWQ -150B ≤14.0 50 ～ 1000
DC-LWQ -150N ≤16.0 80 ～ 1600
DC-LWQ -200A 200 ≤14.0 50 ～ 1000 1.6;
2.5 stainless steel
DC-LWQ -200B ≤20.0 80 ～ 1600
DC-LWQ -200N ≤25.0 125 ～ 2500
Note: ① The flow range listed in the table is the flow range at the time of factory inspection (normal temperature and pressure ρ = 1.205kg / m3);
② As the pressure increases, the flow range also increases;
③ C, K, D respectively represent small, medium and large flow ranges for the same caliber;
④ Unless otherwise specified, the products are delivered at level 1.5;
⑤ For other flow ranges, please specify when ordering;
3.4.2 Typical characteristic curve of the flow meter Typical characteristic curve of the flow meter is shown in Figure 1. The vertical axis represents the basic error and the horizontal axis represents the percentage of the flow. In order to better serve you, please be cautious according to your actual situation. Choose the product that fits your specific needs. After you understand the basic attributes of our products, you can correctly select the instrument according to the design requirements and site conditions and order according to the complete product specification code.
When you fail to select the appropriate instrument according to the design and use requirements, please ask questions and requirements. Our professionals will assist you in selecting or designing and manufacturing special products for you. Please provide at least the following information: working pressure, working temperature, Media name, material requirements, etc. Technical Consulting Guangzhou Dichuan Instrument Co., Ltd.