With the application of IoT technology in industrial fields, the Industrial Internet has become the direction and trend of development. Gas flow parameters are essential data for industrial production, scientific experimentation measurement, and various economic calculations, forming a crucial component of energy metering. Their application in industrial automation is increasingly widespread. In today's era, the role of gas flow sensors in the national economy is becoming increasingly prominent: they are present in sectors such as natural gas, metallurgy, mining, petroleum, aviation, industrial packaging, and industrial cleanrooms. Below, we explore the relevant applications of flow sensors in industrial settings.
Instruments measuring fluid flow are collectively termed flow meters or flow gauges, ranking among the most critical devices in industrial measurement. Fluid flow measurement holds a vital position in industrial automated production and process control. Fluids are broadly categorized into liquid and gaseous media, with flow sensors serving as the key components for measuring both.
By measuring gas flow, one can monitor flow processes, automate production controls, and implement energy management. In advanced precision manufacturing facilities-such as those producing wafers or precision instruments-production must occur within cleanrooms. The air in these cleanrooms must achieve Class 1,000 or even Class 100 cleanliness levels to meet production requirements. These enclosed cleanrooms require daily replacement with clean air. This necessitates flow sensors for automated monitoring and control, ensuring production needs are met while preventing unnecessary energy overconsumption, thereby effectively improving the input-output ratio. The Siargo FS4001 Gas Mass Flow Sensor utilizes Siargo's proprietary MEMS flow sensor and packaging technology. Its measurement range spans 0 to 30 sccm up to 0 to 1000 sccm. Each model's flow rate is achieved through specially designed packaging and intelligent electronics to deliver optimal sensitivity.
The housing is constructed from chemically inert and thermally stable polycarbonate material. It features a high pressure rating of 5 BAR (73 PSI), benefiting from Siargo's unique MEMS chip architecture, specialized packaging technology, and robust sensor casing. Applications span a wide range including instrumentation (e.g., gas chromatography-mass spectrometry), leak detection, process control, gas flow metering, and medical applications. The FS4001 requires an 8 to 24 VDC power supply to provide an analog and/or digital user interface. The analog output is linear from 0.5 to 4.5 VDC, corresponding to 0 to full-scale flow. The digital output is transmitted via RS232. The RS232 communication protocol can be found in this manual.
Secondly, based on industrial applications, sensors can be categorized into flow and micro-flow types. For instance, micro-flow control is essential for achieving optimal monitoring in scenarios like oxygen addition for catalytic reactions or nitrogen filling in potato chip packaging. The micro-flow sensor F1031 offered by Gcain.com utilizes thermodynamic principles to detect gas flow within a flow channel, delivering excellent accuracy and repeatability. The F1031 micro-flow sensor incorporates an internal temperature sensor, with each unit undergoing proprietary temperature compensation calibration. It also features a linear analog voltage output for convenient use.
The chip consists of two thermocouple stacks and a heating resistor: the thermocouple stacks are symmetrically positioned upstream and downstream of the heating resistor; the heating resistor and thermocouple stacks' hot junctions are mounted on a thermally insulated base. The heating resistor warms the thermocouple junctions. The temperature gradient between the hot and cold junctions generates an output voltage-the intrinsic Seebeck effect. When fluid is stationary, isotherms symmetrically trace a straight line perpendicular to the heating resistor's center, maintaining equal temperatures at symmetrical points on either side. As fluid flows from left to right, isotherms tilt toward the right. The temperatures at symmetrical positions on both sides of the heating element are no longer equal. This temperature difference can be measured by thermocouple stacks placed on both sides of the heating element. Since heat transfer in the fluid depends solely on the fluid mass and its heat capacity, the sensor can directly measure the fluid mass flow rate.
Furthermore, industrial applications requiring nitrogen, ammonia, or inert gases for production rely on gas flow sensors for measurement and monitoring. The FS4000 series mass flow sensors offered by GCA utilize MEMS flow sensor technology and intelligent electronic control technology, developed specifically for general gas flow monitoring. This sensor directly measures gas mass flow with low pressure loss. It is suitable for monitoring purified air or nitrogen flow and can also be used in environmental samplers (such as chromatography instruments). The FS4003 Mass Flow Sensor features a 3mm pipe inner diameter and offers a cost-effective measurement range up to 5SLPM. It is suitable for particle counters and various analytical instruments. The FS4008 Mass Flow Sensor features an 8mm pipe inner diameter and a measurement range up to 50SLPM. It can be used in anesthesia equipment and clean gas detection applications, such as air samplers and gas analyzers.