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Chemical Flow Meter specifically refers to a flow meter that can be used to measure chemical materials. So how to choose the most suitable Chemical Flow Meter? Hope you can find the answer after reading this article.
Chemical flowmeters are used to measure flow rate that flow through them. You may often hear about ultrasonic flow meters, electromagnetic flow meters, turbine flow meters, volumetric flow or mass flow. Chemical flow meters are common in industries like petrochemical plants and refineries. And play a vital role in the manufacturing process since they help to enhance manufacture efficiency.
Sino-Inst offers a variety of Chemical flow Meters. If you have any questions, please contact our sales engineers.
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Difficulties in the measurement of chemical liquids/gases
If you want to choose a suitable chemical flow meter, you must first understand the characteristics of the chemical raw materials you need to measure.
According to different forms, chemical raw materials can be divided into solid chemical raw materials, liquid chemical raw materials and gas chemical raw materials. There are many liquid and gas chemical raw materials, and most of them are corrosive. Special attention should be paid to them during transportation and storage.
The chemical flow meter mainly measures gas and liquid chemical raw materials.
Common characteristics of chemical fluids that need to be considered when measuring flow rate:
- Corrosive
This is the most common characteristic of chemical materials. Corrosive acid, alkali, salt solution.
- Flammable and explosive
Compared with flammable liquids and solids, flammable gas is easier to burn, and the burning speed is fast, and it burns out. Gas composed of simple components is more flammable, faster burning rate, higher flame temperature, and greater risk of fire and explosion than gas composed of complex components.
- Electrified
Most flammable liquids are electrolytes. Such as crisps, ketones, gasoline, esters, aromatics and petroleum products.
These substances are transported, poured, shaken, stirred and flowed at high speeds in pipelines, storage tanks, tank trucks, and oil tankers.
Because friction is easy to generate static electricity, when the static charge accumulated to a certain extent, static sparks will be generated, which may cause burning and explosion.
- Stickiness
Such fluids include glue, resin, asphalt, and molasses.
Chemical flow meters types
Corrosive chemical flow meters
Electromagnetic flowmeter is a kind of chemical flowmeter commonly used to measure corrosive liquids.
In addition to the electromagnetic flowmeter can measure the flow of general conductive liquids. It can also measure the volume flow of liquid-solid two-phase flow, high-viscosity liquids, and strong acids, strong bases, and salt liquid media.
Electromagnetic flowmeter commonly used electrode materials include acid-resistant steel, molybdenum-containing acid-resistant steel, Hastelloy, titanium, tantalum, platinum, platinum-iridium alloy and so on.
Acid-resistant steel and molybdenum-containing acid-resistant steel are mainly used for domestic and industrial water, raw water, sewage, waste water, and weakly corrosive acid and alkali solutions such as dilute acid and dilute alkali. The price is low.
Hastelloy is suitable for low-concentration hydrochloric acid and other non-oxidizing acids and non-oxidizing hydrochloric acid, but not suitable for oxidizing acids such as nitric acid.
The corrosion resistance of titanium is slightly better than that of acid-resistant steel, and it has excellent corrosion resistance to chlorides, hypochlorites, and seawater. It has corrosion resistance to oxidizing acids such as nitric acid at room temperature, but not applicable to reducing acids such as hydrochloric acid and sulfuric acid.
Tantalum has superior corrosion resistance similar to glass. Except for a small amount of acid such as fuming sulfuric acid, it is suitable for most acid liquids, but not for alkali liquids such as sodium hydroxide.
Platinum and platinum-iridium alloys have corrosion resistance to almost all acids and alkalis. Aqua regia, ammonium salts and a few liquids are not applicable. The disadvantage is that they are expensive.
Common lining materials for electromagnetic flowmeters include neoprene, polyurethane rubber, polytetrafluoroethylene, hexafluoropropylene, polyethylene and so on.
Among them, the good corrosion resistance is polytetrafluoroethylene, which is resistant to the corrosiveness of hydrochloric acid, sulfuric acid, aqua regia, and concentrated alkali solutions; chloroprene rubber is suitable for the corrosiveness of low-concentration acid and alkali solutions such as tap water and industrial water.
Polyurethane rubber has good wear resistance and poor acid and alkali resistance. It is suitable for pulp, mineral pulp and other slurries.
Corrosive gas chemical flow meters
Usually, a throttling type differential pressure flowmeter is used, and the pipe diaphragm is lined with corrosion-resistant materials. The diaphragm early used corrosion-resistant stainless steel containing molybdenum. Later, a layer of PTFE isolation diaphragm was added to the diaphragm, but it was still easy to be corroded.
Our company continued to improve the diaphragm material and still did not solve the fundamental problem, and later switched to the solution of isolating ordinary instruments from corrosive media with isolating liquid. But the isolation liquid fluorine oil used is very expensive, which greatly increases the production cost of the instrument.
Low corrosive chemical flow meters
Of course, in addition to electromagnetic flowmeters. To measure acidic media, oval gear flowmeters, vortex flowmeters and turbine flow sensors made of acid-resistant materials can also be used. The parts in contact with the medium are made of acid-resistant materials, which can resist general acidic substances.
Such fluids include solvents, solutions, ethanol, diesel, and clean water.
Turbine flow meters are less expensive and usually have chemical flow sensors that have a compact design.
These flow meters are volumetric, meaning that they can measure liquids passing through them either indirectly or directly.
Some of the advantages of using turbine flow meters are that they have high accuracy, can measure high pressure, and have a large measuring range.
Low flow rate-chemical flow meters
For low flow rate fluids, we generally recommend the use of gear flowmeter transmitters. The minimum flow rate is 0.3-20 L/H.
The circular gear flowmeter transmitter is a positive displacement flow transmitter. With the flow of the medium, the gear meshes and rotates, and under the action of the fluid flow, a pressure difference is formed at the inlet and outlet of the meter. No need for power supply, a pair of gears rotate freely. The cavity between the gears is filled with liquid, and the liquid is discharged as it rotates. The flow rate of the liquid flowing through the meter can be known by measuring the number of revolutions of the gear.
High viscosity chemical flow meters
High-viscosity liquid means that the liquid is viscous and thick, which is different from general liquids and non-Newtonian fluids (mud, pulp). The activity is slow and it is very difficult to filter by simple methods.
What’s more, in addition to some dust, the liquid also contains colloidal particles that are not completely dissolved.
For example: solutions such as rubber, paraffin, cellulose acetate, viscose, polyacrylonitrile, paint and animal glue.
The oval gear flowmeter is particularly suitable for measuring high viscosity media. And it is not sensitive to changes in the viscosity of the liquid being measured.
The measurement of the oval gear flowmeter has nothing to do with the flow state of the fluid. The higher the viscosity of the medium, the smaller the leakage from the gear and the metering gap. Therefore, the greater the viscosity of the measured medium, the smaller the leakage error, which is more beneficial to the measurement.
Measurable medium:
Fuel, diesel, gasoline, heat transfer oil, hydraulic oil, kerosene, tar, petroleum, crude oil, asphalt, resin and other liquids. Especially suitable for the measurement of high viscosity liquids.
Corrosive but non-conductive liquid flow meters
When the clamp-on ultrasonic flowmeter is working, the liquid does not directly contact the flowmeter. So it is suitable for various corrosive liquids. But its accuracy rate is relatively low.
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Sino-Inst, Manufacuturer for Chemical Flow Meters.
Sino-Inst’s Chemical Flow Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.
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Chemical flow meter Selection Guide | Sino-Inst
Chemical Flow Meter specifically refers to a flow meter that can be used to measure chemical materials. So how to choose the most suitable Chemical Flow Meter? Hope you can find the answer after reading this article.
Product SKU: Chemical flow meters
Product Brand: Sino-Inst
Product Currency: USD
Product Price: 200
Price Valid Until: 2099-09-09
Product In-Stock: InStock
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