How to Measure Oxygen Flow: The flow rate is determined by the position of the indicator relative to the scale on the tube. Always use the specific flow rate prescribed by a physician.

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How to Measure Oxygen Flow in Industrial Lines

Quick Answer: To measure oxygen flow, select a flow meter that suits the line size, pressure, temperature, and oxygen purity. A rotameter reads flow directly from the position of a float or indicator against a scale on the tube. For compressed oxygen, a thermal mass flow meter or Coriolis mass flow meter gives a direct mass flow signal.

Oxygen flow measurement is common in steel plants, chemical processing, medical gas lines, and water treatment. The principle is simple. The flow rate is determined by the position of the indicator relative to the scale on the tube. Always use the specific flow rate prescribed by a physician for medical oxygen. In industrial lines, use the flow rate set by the process engineer.

Here is the thing. Different oxygen applications need different meter types. A low pressure low flow line can use a rotameter. A high pressure line with compressed oxygen needs something more robust.

Rotameter Measurement for Low Flow Oxygen

A rotameter is a variable area flow meter. It has a vertical tapered tube and a float inside. Gas flows upward. The float rises until the force balances. You read the flow from the position of the float or indicator against the scale on the tube. This method works for clean oxygen at low flow rates, typically up to 100 L/min for medical use or small pilot lines.

In practice, most engineers skip the rotameter when they need a 4-20 mA signal or remote totalization. A rotameter gives local indication only. It has no HART output.

Industrial Oxygen Flow Meter Options

Silver Instruments supplies several flow meter types for oxygen. Thermal mass flow meters are a good choice for clean gas lines. They measure direct mass flow in kg/h or Nm3/h. A typical inline thermal mass flow meter, the Silver Instruments SI-TMF series, covers 0.5 to 200 Nm3/h for DN15 to DN100. Accuracy is around plus or minus 1 percent of reading. The output is 4-20 mA HART.

Coriolis mass flow meters handle oxygen at higher pressure and higher accuracy. The Silver Instruments SI-CMF series can reach plus or minus 0.2 percent of reading. The meter gives direct mass flow and density. Use the meter for custody transfer or reactor feed lines. DN3 to DN50 models can cover low flow and high pressure up to 100 bar.

Vortex flow meters measure volumetric flow. Th

How to Measure Oxygen Flow: The flow rate is determined by the position of the indicator relative to the scale on the tube. Always use the specific flow rate prescribed by a physician.

ey work for oxygen, compressed air, and steam. You need pressure and temperature compensation to convert to mass flow. Vortex meters suit DN15 to DN200 lines. In some cases they are less affected by gas composition changes than thermal meters.

Do not use an electromagnetic flow meter for oxygen gas. Electromagnetic meters need a conductive liquid. Oxygen gas is not conductive. Do not use an oval gear flow meter for gas. It is a liquid-only meter.

How to Size an Oxygen Flow Meter

We have seen this type of sizing question on customer sites many times. A steel plant in Vietnam needed oxygen flow measurement at 6 bar, DN50, 50 to 400 Nm3/h. They wanted a local display and a 4-20 mA HART signal to the PLC. A thermal mass flow meter fit the line without major piping changes.

To size a meter, send these details. Line size in DN. Flow range in Nm3/h or kg/h. Operating pressure in bar. Operating temperature in C. Oxygen purity. Required accuracy. Output signal. We will recommend a meter model and quote price.

Contact Silver Automation Instruments at Tel: +86-25-68650347, Whatsapp: +86-25-52155837, WeChat: +86 15365082610. You can also check our product pages on flow-meter.com.au.

FAQ

Q: Can a thermal mass flow meter measure pure oxygen?
A: Yes. Thermal mass flow meters from Silver Instruments work for clean oxygen. Specify oxygen gas and the required flow range when you order.

Q: What is the typical output signal for an oxygen flow meter?
A: Most models offer 4-20 mA HART. Some also have RS485 Modbus RTU or digital pulse output.

Q: How do you read a rotameter for oxygen?
A: The flow rate is determined by the position of the indicator relative to the scale on the tube. Always use the specific flow rate prescribed by a physician for medical oxygen.

Q: Which flow meter is not suitable for oxygen gas?
A: Electromagnetic flow meters and oval gear flow meters are not suitable. Electromagnetic meters need conductive liquid. Oval gear meters are for liquid only.

Q: What details do you need for a quote?
A: Send us your pressure (bar), temperature (C), pipe size (DN), and flow range. We will reply with a specific model and price.

For a fast quote, contact Silver Automation Instruments directly. We supply industrial flow meters to Southeast Asia, Oceania, Latin America, Africa, and the Middle East.