English article summaries; links open the original Chinese articles.
Flow controller not shutting off? Check three causes
“Not closing completely” can describe several different symptoms. A nonzero reading is not automatically valve leakage. Separate a real gas flow from zero.
Six engineering checks for accurate gas blending
Putting an MFC on each gas channel and setting a flow ratio is a sound starting point for dynamic gas mixing. It does not by itself prove that the intended.
Preparing a flow controller for long-term storage
A flow instrument may spend months unused during production changes, project handover or spare-equipment rotation. Incorrect shutdown and storage can leave.
Why particles and moisture affect flow controllers
Zero drift, residual flow at a zero command, or a changing gas mixture can result from dust, condensate or oil in the gas path. Thermal instruments measure.
Separate or integrated display: four selection differences
“Integrated display or separate readout?” is a frequent question when selecting a gas mass flow instrument. Display arrangement alone does not establish.
Comparing gas flow meter suppliers
Searching for a “gas mass flow meter manufacturer” produces rankings, advertisements and claims of reputation. They can help identify candidates, but they do.
Mass flow control for quartz dehydroxylation purge gas
Dehydroxylation is important in producing high-purity quartz sand, crucibles, tubes and related quartz components for semiconductor and photovoltaic.
What determines the price of a flow controller?
“How much does a gas mass flow controller cost?” cannot be answered meaningfully without its configuration. Range, interface, display, gas compatibility.
Installing compression fittings: six steps and common mistakes
A normal flow reading does not prove that the surrounding piping is leak-free. Double-ferrule fittings are common on gas mass flow controllers, and incorrect.
Accuracy: full scale or reading?
When a supplier answers “±1% accuracy,” the next question is essential: 1% of full scale, or 1% of the current reading? The same number can imply very.
Installation direction and position
When gas supply, leakage checks and settings appear correct but readings still disagree with the reference, installation may be the cause. Tilting an.
Troubleshooting inconsistent flow readings
A setpoint of 500 SLPM but only 400 SLPM delivered, a nonzero reading after closure, or a reading that oscillates does not immediately prove that an MFC or.
Three ways to check gas-path leaks
A small leak at a fitting can make the flow delivered to the process differ from the instrument's reading, affect a gas mixture and reduce repeatability. The.
Converting flow readings for another gas
An MFC or MFM nameplate normally identifies the calibration gas, often nitrogen (N₂). If the application instead uses argon, carbon dioxide, methane or a.
Six steps for selecting a gas mass flow controller
An unsuitable gas mass flow controller can cause unstable processing or production rework. Flowmethod's experience in semiconductor, vacuum and.
Gas Flow Controllers in Combustion: Operating Checks
Flowmethod's guidance for combustion applications highlights six operating issues that can affect gas-flow reliability. Gas-flow regulation is only one part.
Industries using gas mass flow controllers
Flowmethod gas mass flow controllers offer different gas and range configurations for a variety of applications. Typical uses include:
Integrated-Display Flow Controllers: Process Measurement
Gas-flow measurement and control are relevant to natural-gas processing and other industrial gas applications. The required instrument depends on gas.
Choosing a control interface
Gas mass flow controllers (MFCs) and mass flow meters (MFMs) can connect through analog signals, digital communication or a local display. The best option.
What to confirm when selecting a flow controller
Gas mass flow controllers and meters are specialized instruments for regulating or measuring gas flow. Providing the following information before purchase.
Multi-channel touchscreen gas-mixing system delivered
Flowmethod has delivered an integrated, touchscreen-controlled, multi-channel gas mixing system to a research institution. The system met the agreed design.
Digital Thermal Gas Mass Flow Controllers
Digital gas mass flow controllers use a thermal measurement principle in many common designs. Flow changes the heat transferred through a sensing passage.
Gas Flow Switches: Fault Checks and Qualified Service
An explosion-protected gas flow switch may show an abnormal switching state or an incorrect output. The possible causes differ, so record the symptom before.
Flow instrument types: turbine flow meters
Turbine flow meters measure flow by placing a turbine in the flow path. Moving fluid rotates the turbine, and its rotational speed is related to the fluid.
Flow Measurement Principles: Ultrasonic Meters
Ultrasonic flow meters use acoustic signals to determine flow velocity and derive volume flow. Obtaining mass flow requires the appropriate.
Flow Measurement Principles: Coriolis Meters
This article describes a Coriolis mass flow meter, one of the main mass-flow measurement principles. It is different from the thermal gas mass flow products.
Combustion Flow Controllers: Initial Fault Checks
If a gas mass flow controller in a combustion application does not operate normally, check external conditions before assuming an internal failure.
Gas Flow Control in Vacuum Processes
Flowmethod provides gas-flow measurement and control configurations for vacuum-industry applications. Its product options support selection for the required.
Gas Flow Control for Environmental Monitoring
Flowmethod mass flow controllers are used in PM2.5 and other environmental-monitoring equipment. Suitable configurations can support the required flow.
Custom Gas Control for University Research
Flowmethod develops gas-control solutions around university and research requirements. Options include standard or custom MFC configurations, gas mixing.
How Pressure Controllers Work
A pressure controller combines pressure measurement with a regulating valve to maintain a target gas-path pressure. The host provides a pressure command, the.
Thermal Gas Mass Flow Measurement
Thermal gas mass flow instruments infer flow from heat transfer between a sensing element and the gas. One design uses a temperature-measuring element and a.