Wedge flowmeter

One, the introduction:
LGX series of wedge flowmeter flow sensor without deposit, no congestion, the applicable scope is wide, in addition to the application in the general gas, liquid, steam, especially suitable for high viscosity, crystallization, smudgy liquid mixture and high dust gas flow measurement.Long-term operation of high precision, good stability.Simple structure, no moving parts, not easy to be fluid and working performance is stable, reliable, long life;Its special measuring element and take pressure device structure, fluid by not forming stranded or congestion, less pressure loss, high precision is conducted under the condition of low Reynolds number flow measurement of the ideal choice.
Second, the measuring principle:
LGX series wedge flowmeter are differentiae pressure type flow meter, it is the use of energy transformation in the airtight pipeline Bernoulli's law, namely: the steady fluid situations, of the pipeline flow rate is proportional to the square root of the differential pressure.Wedge flowmeter is in the eighty s began gradually to the utility of a new type of flowmeter, the test piece is a v-shaped wedge (also called wedge throttling), its sleek apex Angle downwards, so conducive to containing suspended particles of liquid or viscous liquid pass, not stagnation in throttling upstream side.Fluid flow through the wedge timing, due to the effect of the throttling of the wedge, on top of it, the downstream side produced a square with flow value differential pressure, the differential pressure from the wedge take pressure on both sides to the differential pressure transmitter into electrical signal output, then through special operations, intelligent flow totalizer.especially can show flow value.
Wedge flowmeter flow equation:

Type of qv - volume flowmeter, m after/s
C -- -- -- -- -- - outflow coefficient;
Epsilon -- -- -- -- -- to expansion coefficient;
M -- -- -- -- -- - throttling area ratio;
D -- -- -- -- -- - pipe diameter, m;
Delta p -- -- -- -- -- - differential pressure, pa.
Rho -- -- -- -- -- - density measured medium, kg/m after
LGX series wedge flowmeter has the flow coefficient, the nonlinear error, parameters such as temperature, density variation correction function;Measuring accuracy can reach 0.5%;Can be the scene display and standard current output signal (4 ~ 20 ma DC), or can be conveniently used in automatic control system and computer networking, traffic or other parameters automatic adjustment and control.
Three, the application of medium:
LGX series wedge flowmeter can be in high viscosity, low Reynolds number, Reynolds number > 500 can be used) of the fluid for high accuracy of flow measurement;Mainly used for high viscosity (heavy oil, residual oil, diesel oil, engine oil, etc.), industrial gas, coke oven gas, blast furnace gas and producer gas, city gas), hydrogen, nitrogen, air, water and sewage flow measurement of liquid such as medium.
Four, wedge flowmeter features:
1, particularly suitable for high viscosity, low Reynolds number, suspended particles or bubble medium measurement;
2, the measurement precision is not affected by fluid medium dielectric constant features of and restrictions;
3, wedge a special structural design, has guide effect, anti clogging;
4, the density of fluid viscosity, temperature changes, changes and other compensation function;
5, vibration resistance, impact resistance, resistance to dirt, corrosion, explosion-proof;
6, wedge flowmeter has two-way flow measurement function;
7, high measuring accuracy;
8, simple structure, strong, high reliability, convenient installation and operation maintenance cost is low
9, no moving parts, no wear, use for a long time do not need to calibration.
Five, the technical parameters of the wedge flowmeter:
A degree, the flow measurement range: > 1;
2, measuring diameter: age from 25 to 1000 mm (over range can be special order);
3, the measuring accuracy: 0.5, 1.6;
4, Renault coefficient using range: 300 ~ 1 x108;
5, measuring liquid viscosity limit: 500 mpa. S.
6, scope of work pressure: 6.2 MPa or less;
7, installation and connection mode: flange connection;Welding connection;
8, flowmeter work environment temperature: - 20 - to + 70 ℃;
9, work environment relative humidity: 15 ~ 85%;
10, power supply voltage: 24 v DC;
11, communication methods: RS495.
Six, notable matters of installation:
1, the installation can be horizontal, vertical or inclined, should guarantee the tube filled with liquid.
2, throttle device before and after the straight pipe should be straight, not visible to the naked eye bends, should be "round" at the same time, the inner surface should be clean, without potholes and sediment;
3 and the request of straight section length and throttling device installation should be in conformity with the relevant provisions of the GB/T26224-93.
4, lead pressure pipeline installation should comply with the standards stipulated by the regulations.
Seven, classification and structure of the wedge flowmeter:
According to different product scope of supply, and the output signal, wedge flowmeter can be divided into three categories:
1, wedge sensor;
Provide only the differential signal form part of the wedge device (part), differential pressure transmitter and flow display section is not available, the output signal for the differential pressure.Other configuration shall be conducted by the users themselves.
2, wedge flow transmitter;
By the wedge orifice plate flow sensor and differential pressure transmitter.Have a split type installation and one-piece installation structure.
A wedge, orifice flow meter by independent wedge orifice plate flow sensor and differential pressure transmitter.Wedge orifice plate flow sensor and differential pressure transmitter of pressure pipe connection between performed by users themselves.
B, one-piece installation is product factory has the differential pressure transmitter and wedge orifice connected into an organic whole, users buy one-piece wedge orifice flow meter, don't need to join again when using pressure tube.But must be allocated to the corresponding flow calculator, pressure transmitter and temperature transmitter.
3, cut-off valve and other parts.The connection between the parts combination performed by users themselves.Explosion-proof type and ordinary type two kinds.
Eight, structure:
One-piece installation is composed of intelligent display and wedge orifice device a wedge orifice meter.It comes with a high quality of the differential pressure sensor, pressure sensor, the thermal resistance temperature sensor.Type intelligent display not only in the range of differential pressure sensor range automatically adapt to, and all kinds of compensation coefficient such as: flow coefficient C epsilon, flow beam expansion coefficient are calculated for on-line, expanding truly achieve the scale at the same time guarantee the accuracy of measurement.Using large screen LCD screen display with cumulative flow, transient flow, the instantaneous pressure and transient temperature, without manual switch.4-20 ma two wire system transient flow output.
Nine, wedge flowmeter selection table:

Ten order, design notes:
1, pipe size: diameter x wall thickness (mm);
2, measuring medium name: medium density (kg/m3);
3, set the maximum flow: meter on the range of limit (kg/h or m3 / h);
4, process of minimum flow: (kg/h or m3 / h);
5, work pressure (Mpa);
6, work temperature: (° C);
7, such as with our company, please provide together: intelligent flow totalizer.especially pressure range, or pressure transmitter type, range;Temperature range, or models, range temperature transmitter.