![]() ![]() ThisĪllows for extremely fast, real time measurements of flow that are sensitive enough to report pulsations in flow as A series of calculations is performed and flow rate data is updated an average of 1,200 times per second. The sensors send information to the microprocessor which determines the massįlow. In an Alicat mass flow instrument a discrete absolute pressure sensor and a temperature sensor are placed in the laminar region of the flow stream. Z s = Compressibility at Standard Conditions Z a = Compressibility at Measured Conditions P s = Absolute Pressure at Standard Condition T a = Absolute Temp at Flow Condition (Kelvin) T s = Absolute Temp at Standard Condition (Kelvin) To determine the mass flow rate, these two known laws of physics need to be applied the temperature effect onĭensity and the absolute pressure effect on density. Essentially this is a determination of theĭensity of the gas at sea level and a pre-determined temperature as related to the actual flow conditions. Pressure (STP) condition for "normalizing" the mass flow calculation. Using non-Ideal Gas Laws requires a reference to a standard temperature and Ideal Gas Laws show us that the density of a gas is affected by its temperature, absolute We now have the volumetric flow rate upon which we can apply additional measurements and calculations to determine the actual mass flow rate. ![]() The viscosity of the gas must be calculated by the microprocessor in relation to that gas temperature. Finally, the gas temperature is measured as The differential pressure drop is measured within the laminar region. This eliminates turbulence and creates a state of laminar gas flow beneath the accepted Reynolds threshold of 2000. Laminar Flow Element and it forces the gas molecules to move in parallel paths along the length of the passage. To put this mathematics into practical use, an internal restriction is created. This now shows the linear relationship between volumetric flow rate (Q), differential pressure (ΔP), and absolute viscosity (η). In it more simplified form, the calculations related to the geometry of the restriction can be replaced by a constant factor. The Benefits of using an Alicat Mass Flow Meter ![]() Every meter can also be used with over 80 gases or gas mixtures, you can even add your own measurement of mass flow. We offer many variations which cater for a range of requirements, our standard M series model can cover most applications but models also exist for portable use, corrosive gases, ultra-low pressure drop and portable calibration units.Įvery gas flow meter in the range features a local display and keypad for easy setup, analogue output and RS-232 digital communications (others also available). They compensate for pressure and temperature, and can output both mass flow and volumetric flow rates for your process application. Our range of mass flow meters from Alicat scientific are suitable for many types of gases and gas applications. The Benefits of using an Alicat Mass Flow Meter.DS(font: Arial 8.Use a single Mass Flow Meter to measure Mass Flow rate, Volumetric Flow rate, Process pressure and Temperature Table of contents Brooks Instrument is a Supplier Partner with Cross Company | Instrumentation Group)
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |