TGF600 Thermal Mass Flow Meter

Thermal Mass Measurement Principle

Thermal mass flow meters measure the mass flow rate of gases and liquids directly. Volumetric measurements are affected by all ambient and process conditions that influence unit volume or indirectly affect pressure drop, while mass flow measurement is unaffected by changes in viscosity, density, temperature, or pressure.

Thermal mass flow meters are often used in monitoring or controlling mass-related processes such as chemical reactions that depend on the relative masses of unreacted ingredients. In detecting the mass flow of compressible vapors and gases, the measurement is unaffected by changes in pressure and/or temperature.

TGF600  Thermal Mass Flow Meter dengan desain yang lebih kokoh untuk beradaptasi dengan aplikasi industri yang keras. Ini mengimplementasikan teknologi sensor film terbaru COMATE dan sensor sensitivitas tinggi untuk memastikan pengukuran yang stabil pada laju aliran yang sangat rendah hingga 0,3 Nm/s.

Model insertion standar dapat disesuaikan dengan pipa dari DN80 ~ DN500, model yang diperluas dapat masuk ke pipa yang lebih kecil hingga ke DN25 dan pipa yang lebih besar hingga ke DN 6000. Comate juga menyediakan TGF 600 Thermal Mass Flow Meter dengan variasi koneksi Inline flange,Inline ulir/thread, Insertion flange, Insertion remote.

Applications

However, in many applications, the thermal properties of the fluid can be dependent upon fluid composition. In such applications, the varying composition of the fluid during actual operation can affect the thermal flow measurement. Therefore, it is important for the thermal flow meter supplier to know the composition of the fluid so that the proper calibration factor can be used to determine the flow rate accurately.

Suppliers can provide appropriate calibration information for other gas mixtures, however, the accuracy of the thermal flow meter is dependent on the actual gas mixture being the same as the gas mixture used for calibration purposes. In other words, the accuracy of a thermal flow meter calibrated for a given gas mixture will be degraded if the actual flowing gas has a different composition.

• Compressed air flow and distribution
• Natural gas consumption eg for burner and boiler feed control
• Monitoring and control of stack or flue gas (where composition known)
• Landfill gas recovery
• Flare gas measurement
• Gas flow mixing & blending
• The gas leak testing and detection

The thermal-mass flow measurement principle is based on the physical effect of heat convection, so the sensor signal depends on both the gas flow velocity across the membrane and the measured gas mixture’s thermal properties.

So a thermal flow sensor provides accurate measurement data if it has either been pre-calibrated for a particular gas mixture or if it has a routine that dynamically takes into account varying gas mixtures when measuring flow.

Gas meters can be used for a very large number of potential gas mixtures, and their composition can vary over time. In practice, it is not feasible to perform individual pre-calibrations for all the possible natural gas mixtures, which is why thermal-mass sensors for gas meters have a proprietary, dynamic natural gas and hydrogen recognition routine to ensure accurate flow measurements, even when gas compositions vary.

Air Velocity Probes

Probe-style mass flow sensors are used to measure air flows and are insensitive to the presence of moderate amounts of dust. They maintain a temperature differential between two RTDs mounted on the sensor tube. The upper sensor measures the ambient temperature of the gas (Figure 5-10A) and continuously maintains the second RTD (near the tip of the probe) at 60°F above ambient. The higher the gas velocity, the more current is required to maintain the temperature differential.

Another version of the velocity probe is the venturi-type thermal mass flow meter, which places a heated mass flow sensor at the minimum diameter of a venturi flow element and a temperature compensation probe downstream (Figure 5-10B). An inlet screen mixes the flow to make the temperature uniform. This design is used for both gas and liquid measurement (including slurries), with flow range a function of the size of the venturi. Pressure drop is relatively low, and precision is dependent upon finding the proper probe insertion depth.

Advantages

• Measure gas mass flow rate directly
• Suitable for applications where temperature and pressures fluctuate
• Highly accurate and repeatable measurements with a typical accuracy of ± 1% FS
• Able to measure accurately low gas flow rates or low gas velocities
• Excellent turn down ratio, typically 50:1
• No moving parts

Fitur

• tipe inline dapat diinstal / dihapus tanpa menghentikan garis
• Dapat digunakan pada pipa dalam bentuk yang berbedaLaju aliran minimum turun ke 0,3 m / dt, rasio turndown super lebar 1: 100
• Tidak ada bagian yang bergerak, hampir tidak ada kehilangan tekanan
• Pengukuran aliran massa langsung, tidak memerlukan kompensasi suhu atau tekanan
• Desain terisolasi untuk bagian-bagian listrik untuk menghilangkan gangguan
• Desain efisiensi daya yang dioptimalkan,konsumsi daya rendah hingga 60mA @ 24VDC
• Diadaptasi untuk sumber daya apa pun
• Layar LCD 2 baris dengan unit displayOutput standar adalah pulse dan RS485, Hart @ 4 ~ 20mA dan 4 ~ 20mA juga tersedia
• Metrik/Unit Inggris dapat dipilihFungsi proteksi kata sandi dan fungsi diagnosa diri

Pengukur aliran gas termal Seri TGF600 Thermal Mass Flow Meter  inline mengukur dasar aliran massa gas berdasarkan teori dispersi termal. Ini menggabungkan teknologi canggih COMATE pada pemancar, sensor, pembuatan film dan kalibrasi, dapat memberikan pengukuran yang stabil dan akurat bahkan di bawah aplikasi industri yang keras dan memerlukan pemeliharaan yang sangat kurang.

Spesifikasi

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