liquid flow meter types liquid nitrogen flow meter

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The RFLDE series liquid flowmeter is specially designed with a Chinese LCD display with backlight and wide temperature. It has complete functions and practicality, intuitive display, convenient operation and use, which can reduce the inconvenience caused by other electromagnetic flowmeter English menus. In addition, we exclusively designed the 4-6 multi-electrode structure to further ensure the measurement accuracy and no grounding ring is needed at any time, which reduces the volume of the instrument and the trouble of installation and maintenance. The measurement accuracy of the liquid flow meter is not affected by changes in fluid density, viscosity, temperature, pressure and conductivity. The sensor voltage signal of the liquid flow meter has a linear relationship with the average flow rate, so the measurement accuracy is high. The liquid flow meter has no obstructions in the measuring pipeline, so there is no additional pressure loss; there are no moving parts in the measuring pipeline, so the sensor has an extremely long life. Because the induced voltage signal of the liquid flow meter is formed in the entire magnetic field-filled space, it is the average value of the pipe surface, so the straight pipe section required by the sensor is shorter, and the length is 5 times the pipe diameter. Only the inner lining and electrode of the sensor are in contact with the liquid to be measured. As long as the electrode and inner lining materials are selected reasonably, it can resist corrosion and abrasion.

Correct selection:

The selection of the instrument is a very important work in the application of the instrument. The relevant data shows that 2/3 of the faults in the actual application of the instrument are caused by the wrong selection or installation of the instrument. Please pay special attention.

◆Collect data

1. Measured fluid composition

2. Maximum flow, minimum flow

3. Maximum working pressure

4. The highest temperature, the lowest temperature

◆The fluid to be tested must have a certain degree of conductivity, and the conductivity is >5μS/CM

The maximum flow rate and minimum flow rate must conform to the numbers in the table below.

The actual maximum working pressure must be less than the rated working pressure of the flowmeter.

The maximum operating temperature and the minimum temperature must meet the temperature requirements specified by the flowmeter.

Determine whether there is negative pressure.

You can select the corresponding electromagnetic flowmeter according to the flow rate in the above table. If the inner diameter of the selected electromagnetic flowmeter does not match the inner diameter of the current process pipeline, the tube should be reduced or expanded.

If the pipeline is contracted, it should be considered whether the pressure loss caused by the contraction will affect the process flow.

Considering the price of the product, you can choose a smaller-caliber electromagnetic flowmeter to reduce investment.

When measuring clean water, the economic flow rate is 1.5-3m/s. When measuring the solution that is easy to crystallize, the flow rate should be increased appropriately, 3-4m/s is suitable, which can play the role of self-cleaning and prevent adhesion and deposition; measuring ore slurry, etc. In the case of abrasive fluids, the flow rate should be appropriately reduced, 1.0-2m/s is appropriate to reduce the wear of the lining and the electrode. The actual application rarely exceeds 7m/s, and it is even rarer to exceed 10m/s.

Correct wiring

①The excitation cable can choose YZ medium-sized rubber sheathed cable, and its length is the same as that of the signal cable.

②Signal cables and other power cables must be strictly separated, cannot be laid in the same pipe, cannot be laid in parallel, and cannot be twisted together. They should be worn separately in the steel pipe.

③The signal cable and the excitation cable should be as short as possible. The excess cables should not be rolled together. The excess cables should be cut off and re-soldered. When the cables enter the electrical interface of the sensor, they should be U-shaped at the port to prevent rain. Penetrate into the sensor.

④The connection between the excitation cable of the split type electromagnetic flowmeter and the converter is completed by dedicated wiring, and the converter and the external connection are the same type of electromagnetic flowmeter.

Wiring of liquid flow meter:

①The excitation cable can choose YZ medium-sized rubber sheathed cable, and its length is the same as that of the signal cable.

②Signal cables and other power cables must be strictly separated, cannot be laid in the same pipe, cannot be laid in parallel, and cannot be twisted together. They should be worn separately in the steel pipe.

③The signal cable and the excitation cable should be as short as possible. The excess cables should not be rolled together. The excess cables should be cut off and re-soldered. When the cables enter the electrical interface of the sensor, they should be U-shaped at the port to prevent rain. Penetrate into the sensor.

④The connection between the excitation cable of the split type electromagnetic flowmeter and the converter is completed by dedicated wiring, and the converter and the external connection are the same type of electromagnetic flowmeter.

Liquid nitrogen flowmeter is a new type of turbine flowmeter newly developed by our company. Its wetted materials are all ultra-low temperature materials and a new high-pressure resistant structure. It breaks through the traditional structure mode of turbine flowmeters and can measure ultra-low temperature, low pressure, high pressure and low temperature fluids. measuring.

Liquid nitrogen flow meter

 The LWGY turbine flow sensor is a high-precision flow measuring instrument. Our company has been committed to the development and innovation of turbine flow meters for a long time. Up to now, it has realized ultra-small diameter (minimum 0.5mm) and ultra-low temperature type (-196 ℃). Various types of turbine flowmeters such as ultra-high pressure type (*high pressure 50MPa) and all-tetrafluoroethylene material type have filled the measurement gaps in various fields such as domestic and international. Its measurement is mainly suitable for low-viscosity media, such as water, diesel, gasoline, acid and alkali and other corrosive fluids. Because of its simple structure, it has a wide range of applications. It is widely used in food, beverages, petroleum, cosmetics, chemicals, metallurgy, and water. Metering and control system for oil, alcoholic liquid, various water and other media in the fields of processing, water plants, scientific research, etc.

  1. Overview of LWGY Liquid Nitrogen Flowmeter

 The LWGY turbine flowmeter is composed of a turbine flow sensor and a display instrument. It is produced by our factory using foreign advanced technology and the most advanced materials. It is one of the most ideal flow meters for ordinary liquid measurement. The flowmeter has the characteristics of simple structure, high accuracy, easy installation, maintenance and use. It is suitable for measuring liquids that do not corrode with stainless steel 1Cr18Ni9Ti, 2Cr13, corundum Al2, and cemented carbide in closed pipelines, and are free of impurities such as fibers and particles. If used in conjunction with a display instrument with special functions, it can be used for automatic quantitative control, overweight alarm and other purposes.

  2. Product features of LWGY liquid nitrogen flow meter:

 1 The sensor is a fully enclosed structure, so it is safe and reliable, and can be used for high-pressure pipeline measurement according to requirements;

 2 The sensor material can be customized according to requirements, such as 304, 316 and all tetrafluoroethylene materials, suitable for various media, such as acids, alkalis and other strong corrosive liquids;

 3 The sensor is a hard alloy bearing thrust type, which not only guarantees accuracy, but also improves wear resistance;

 4 The sensor has been specially modified by our company, and the structure is simple, firm and easy to disassemble and assemble;

 5 The measurement range is wide, and the lower limit flow rate is low;

 6 Measurement accuracy 0.2, 0.5, 1.0 can be selected as required;

 7 Our company's caliber breaks through the convention, from 0.5mm, 1mm, 2mm, etc. to super large diameter plug-in type can be customized;

  8. When the structure of anticorrosive all-tetrafluoroethylene material is used, all the tetrafluoroethylene materials are imported from Japan, which is safe and reliable;

  9. Ultra-high pressure type sensor adopts high-thickness sealed sensor, matching high-pressure flange or installation accessories;

  10. At ultra-low temperature (-196 ℃), the sensor structure is made of special customized imported materials, supporting low temperature resistant amplifier;

 11 The comprehensive pressure loss is small, the repeatability is good, and the accuracy is high.

 12 It has high anti-electromagnetic interference and anti-vibration ability.

 13 Various displays, battery-powered on-site display, external power supply display, and various signal outputs are all configured;

 14 The matching explosion-proof meter is suitable for the use of explosion-proof products;

 15 Various installation methods are available: thread, flange, quick installation, direct welding, etc.;

 16 It can be used with our company's WK-L0 intelligent full Chinese flow totalizer to complete long-distance display;

 17 It can be combined with our company's WK control instrument and control system to form automatic quantitative conveying and feeding equipment;

  three. The main technical performance of LWGY liquid nitrogen flow meter:

 1 Nominal diameter: common type (0.5 ~ 300) mm;

 Anti-corrosion type (6 ～100) mm

Insertion type (80～600)mm

 2 Medium temperature: common type (-20 ～80) ℃

 High temperature type (-20 ～120)℃

 Ultra-low temperature type (-196 ～80 )℃

 3 Ambient temperature: (-20 ～55) ℃;

 4 Accuracy: ±0.2%, ±0.5%, ±1%;

 5 Detector signal transmission line system: three-wire voltage pulse (three-core shielded cable);

 6 Power supply: voltage: 12V±0.144V, current:

 7 Output voltage amplitude: high level ≥8V, low level ≤0.8V;

 8 Transmission distance: the distance from the sensor to the display instrument can reach 250 meters;

 9 On-site display type power supply: 3V (Lithium battery power supply, can be used continuously for 3 years);

 10 Display mode: on-site liquid crystal display instantaneous flow and accumulated flow;

 11 On-site display power supply with signal output: 24V; 4-20mA two-wire current output, long-distance transmission distance of 500 meters.

 12 The flow range and pressure are shown in the figure, and the flow unit is m3/h (for anti-corrosion type or plug-in type, please inquire)