Thermal mass flow meters
generally use combinations of heated elements and temperature sensors to measure the difference between static and flowing heat transfer to a fluid and infer its flow with a knowledge of the fluid’s specific heat and density. The fluid temperature is also measured and compensated for. If the density and specific heat characteristics of the fluid are constant, the meter can provide a direct mass flow readout, and does not need any additional pressure temperature compensation over their specified range.
Technological progress has allowed the manufacture of thermal mass flow meters on a microscopic scale as MEMS sensors; these flow devices can be used to measure flow rates in the range of nano liters or micro liters per minute.
Thermal mass flow meter (also called thermal dispersion flow meter) technology is used for compressed air, nitrogen, helium, argon, oxygen, and natural gas. In fact, most gases can be measured as long as they are fairly clean and non-corrosive. For more aggressive gases, the meter may be made out of special alloys (e.g. Hastelloy), and pre-drying the gas also helps to minimize corrosion.
Today, thermal mass flow meters are used to measure the flow of gases in a growing range of applications, such as chemical reactions or thermal transfer applications that are difficult for other flow metering technologies. This is because thermal mass flow meters monitor variations in one or more of the thermal characteristics (temperature, thermal conductivity, and/or specific heat) of gaseous media to define the mass flow rate Kind of Siargo Gas Flow Meters
Model of Gas Flow Meters :
MF4000 Series Mass Flow Meters are designed for applications where manifold flow measurements. The standard flow channels are 3 mm and 8 mm in diameter, respectively. Plastic finishing with an easy change of the mechanical adaptors enables applications at a low cost and different environments. The meters can be used for process gas control, environmental samplers and many other industrial applications.
MF5000 Series Mass Flow Meters are specially designed for small pipe flow monitoring and control. The series can measure gas flow in a pipe diameter as small as 3 mm, but not over 19 mm. The accuracy of the meters are generally ±(1.5+0.2FS)% or better depending on the requests. The meters can work at an environment of -20 to 60°C and pressure up to 1.5 MPa. Applications include semiconductor gas process monitoring and control, hospital oxygen gas monitoring, etc.
MF5200 Series Oxygen Flow Meters are specially designed for oxygen metering system in a hospital. These meters are operated with the standard industrial user interfaces (RS485), and user defined alarm functions for better monitoring or control over the network. The off-the-shelf products (MF5212 and MF5219) are for gas flow measurement of 0 ~ 300 SLPM and 0 ~ 800 SLPM, respectively.
MF5600 Series Mass Flow Meters are specially designed for applications where the display is often required to be placed separated away from the flow channel or meter body, such as the oxygen metering system in a hospital. These meters are opted with the standard industrial user interfaces (RS485 and 4 ~ 20mA), and user defined alarm functions for better monitoring or control over the network. The off-the-shelf products (MF5612 and MF5619) are for gas flow measurement of 0 ~ 300 SLPM and 0 ~ 800 SLPM, respectively.
MF5700 Series Mass Flow Meters feature cost effective ultra low power operating on 4 AA batteries. The portable design has excellent exchangeable mechanical adaptors, easy data accessible and user programmable capabilities. The internal data storage can also help for many industrial on-site applications. The meters can be customized for various general purpose flow applications.
MF5806 Series Oxygen Flow Meters are specially designed for hospital individual oxygen therapy applications. it provides precise measurement of instant oxygen intake rate and accumulated oxygen dosage for the individual oxygen delivery system. the design provides low power consumption that make it possible for operation on battery when power is an concern. the meter can be directly connected to the central station via RS485 that can provide remote monitoring and control which will reduce the risk of oxygen over dosing.
MF Series In-line Mass Flow Meters are designed for all purpose industrial gas metering and control. The meters provide direct mass flow information as well as well-designed user friendly interfaces (RS485/4~20mA/pulse etc.) for data process. The series cover the DN range from 25 to 100 mm with an accuracy of ±(1.5+0.5FS)% or better depending on the requests. The meters can work at an environment of -20 to 60°C and pressure up to 1.5 MPa. The package ensures hygienic safety and can be used for beverage and food industrial gas process such as CO2. Other applications include special gas monitoring in steel process, hydrogen flow control in chemical industry, process gases (oxygen, nitrogen, helium, compressed air or argon) monitoring in manufacture, to name a few.
MFI Series Insertion Mass Flow Meters are designed for gas monitoring and control in a large pipe line where installation of an in-line flow meter is either difficult or costly. The insertion meters are equipped with a self-sealed valve and hence provide a solution that only requires minimal interruption to the normal working circumstance. The suggested starting metering DN is 150 mm and above. All of the insertion meters have an accuracy of ±(1.5+0.5FS)% or better depending on the requests. The meters can work at an environment of -20 to 60 °C and pressure up to 1.5 MPa. Applications include but not limited to oxygen, nitrogen, methane, and compressed air flow monitoring for manufacture process control.
MF-GD Series Low Pressure Mass Flow Meters are designed for all low pressure industrial gas metering and control. The meters substantially reduce the installation cost as well as other logistical cost. In addition, the all electronic meters provide easy data access as well as remote data networking capabilities.