LKQ Thermal Type Gas Mass Flowmeter

General

The LKQ series thermal gas mass flowmeter provide a reliable solution for gas mass flow detection. Low flow sensitivity, fast response and wide range ratio make this model of meter the first choice for many important gas applications. The Steel - Trak sensor automatically corrects the effects of temperature and pressure, making the mass flow output more stable and reliable. Its advantages in gas measurement are particularly pronounced, especially in the case of low pressures and complex gas compositions. Compared with other flowmeters, the thermal type gas mass flowmeter has the advantages of small pressure loss, wide range ratio and high sensitivity of small range segments, which is more conducive to energy saving and procurement costs.

LKQ series thermal type gas mass flowmeter is a mass flow measurement and monitoring meter,which can detect  air, natural gas, hydrogen, oxygen, chlorine, nitrogen and ammonia, ammonia, coal gas, phosgene, flue gas and various chemical mixtures, without pressure and temperature compensation. It can be widely used in petroleum, chemical, metallurgy, electric power, water treatment, paper, food, medicine, cement, textile and various production, scientific research units for process control and gas flow measurement. Widely used in: flow measurement of steel plant, coking plant gas.

Smoke flow measurement from the chimney

Aeration flow measurement in water treatment

Cement, cigarette, glass flow measurement during production

Compressed air flow measurement

Measurement of mixed gas flow of various natural gas, coal gas, liquefied gas, flare gas,ammonia gas, carbon dioxide, etc.

Features

• Direct measurement of mass flow of gas without pressure and temperature compensation;

• High repeatability, high reliability, high stability and high precision;

• Range range width: up to 1000:1 or more;

• Explosion-proof, anti-corrosion design, suitable for harsh conditions, corrosive occasions；

• High sensitivity, especially suitable for flow measurement of large diameter and low flow rate;

• Eextremely small pressure loss and almost negligible;

• Diverse structure, flexible installation, convenient loading and unloading, easy to use, basically maintenance

• LCD display, clear and intuitive, showing both instantaneous flow and cumulative flow, so that you can see more clearly and more directly;

Technical Parameters

Measuring PrincipIe

As shown in Figure 1, the temperature sensor measures the temperature of the gas in the pipe, and the other is a speed sensor. It is electrically heated to a temperature higher than that measured by the temperature sensor and keeps the temperature difference constant. When the gas flows away with the heat on the speed sensor, in order to keep the temperature difference constant, additional electrical compensation heating is required, and this compensated electrical power is proportional to the gas mass flow.

In the above formula: Qm the gas mass flow rate, K is the meter factor (constant), Δp the compensated electric power (can be obtained by measurement), Cp is the constant pressure specific heat capacity (determined by the gas composition); Δt the temperature difference (constant) between the two probes; S cross-sectional area of the pipe.

Based on the above principle, for large-caliber flow measurement, although there is no corresponding large caliber calibration device to calibrate the flowmeter, the mass flow rate of the fluid in the large caliber can be conveniently measured by measuring the corresponding mass flow rate on a standard caliber calibration device.

Both sensors are made of metal platinum with stable performance and are sealed by special process in 316L stainless steel pipe or special material pipe resistant to acid and alkali corrosion. Therefore, they are extremely strong and will not pollute the measured fluid or be polluted by the measure fluid with quite good corrosion resistance.

Reference Flow range

Product Classification

LKQ-A1 plug-in type

Applicable to gas mass flow measurement with pipe diameter greater than DN80. The meter has features such as high precision, good repeatability, high reliability, wide range ratio, fast response, simple and convenient installation, basic free of maintenance, almost no pressure loss, pipe diameter has a very small influence on the price. It has become more and more widely used in the field of gas measurement. Especially after the design with the ball valve installation, it breaks the history that the gas must be shut down when installing the flowmeter on site, which greatly facilitates the use.

LKQ-A2 pipe mounting type

Applicable to gas mass flow measurement with pipe diameter less than DN65. It uses a more beautiful design, with double circlip, ten-layer V-type PTFE gasket, and flange with concave and convex surface,  so that the meter will not leak under high pressure, which is more convenient for use, disassembly and maintenance.

LKQ-A2F3 anti-corrosion type

He anti-corrosion type thermal gas mass flowmeter has all the features of the conventional thermal mass flowmeter and the sheath of the sensor is made of special metal material tantalum with good acid corrosion resistance, and in the concentration of 28~29% hydrochloric acid ( at this concentration, hydrochloric acid is the most corrosive to metals.) the wall thickness will be corroded by 4u every year. If the wall thickness of the sheath is to be completely corroded, it takes more than ten years,moreover, the corrosive properties of chlorine, phosgene and other gases actually used are not as corrosive as the concentration of 28, 29% hydrochloric acid solution, and the PBF probe and the pipe to be tested are reliably sealed.