Let me get straight to the point so you don't choose the wrong equipment and waste money 👇

👉 To "precisely control" gas or oxygen → select "Flow Controller (MFC)".
👉 Only choose a "flow meter" if you just want to know how much water is flowing.

Why must gas/oxygen be controlled by a "controller"?

Because both of these gases share several common problems:

Pressure will change (cylinder pressure drops, pipeline pressure fluctuates).
Temperature will change
If the traffic is unstable,Safety and quality issues directly caused problems. ⚠️

What if we only use a "flow meter + manual valve"?

It was just set up, and it ran out of control after 10 minutes.
A change in upstream pressure immediately leads to a change in flow rate.
Poor repeatability, requires readjustment every time.

👉 This isn't control; it's just "visual estimation + gambling." 😅

What does MFC do? (Important)

The mass flow controller contains:

mass flow sensor
Control valve
PID control

You just need to give it a setting value (e.g., 5 slm).
It will compensate for pressure and temperature changes itself, bringing the flow back.

Quick Select Table (Gas/Oxygen Only)

Usage requirements	Recommended choice
Fixed flow rate, stable for a long time	MFC(Learn more about the TMFC series)
Mixing ratio control (gas mixing)	MFC(Learn more about the TMFC series)
Process/Experiment/Calibration	MFC(Learn more about the TMFC series)
Only monitor, do not adjust	Flowmeter
Extremely low budget and low accuracy	Flow meter + needle valve

Oxygen & Gas Safety Reminders (Very Important)

⚠️ When choosing MFC, please pay attention to the following:

Is it compatible with oxygen (O₂ Clean)?
Valve material (avoid grease and flammable materials).
Does it comply with relevant standards (such as oxygen-specific specifications)?

👉 Not every MFC can be used directly for oxygen therapy!

Engineer's one-sentence version

The very act of "precisely controlling gas" is essentially saying: use MFC.

If you'd like to give me more information:

Type of gas (What type of gas is it?)
Flow range (e.g., SCCM or SLM)
Pressure source (gas cylinder? pipeline?)

I can directly help you determine whether you should use MFC or if MFM + control valve is sufficient. 🔧