Oxygen Flow Meters: Calibrated Regulation Hardware for Medical and Industrial Gas

Quick Answer

Quick Answer: These oxygen flow meters measure and regulate gas flow in medical and industrial oxygen lines. Silver Automation Instruments supplies calibrated units with dual scales, needle valves, and optional 4-20 mA HART output. Send your pressure in bar, temperature in degrees Celsius, pipe size in DN, and flow range for a price quote.

What These Flow Meters Do in a Gas Line

A calibrated oxygen flow meter is direct hardware. It sits in the line, reads the gas flow, and gives the operator a clear value. In most systems the meter also controls flow with an integrated needle valve.

We see two main types in the field. A variable area flow meter works well for low flow oxygen lines from 0.1 to 15 liters per minute on DN15 or DN20 pipe. A thermal mass flow meter works better for larger industrial lines from 0.5 to 50 standard cubic meters per hour.

Because oxygen service has strict cleaning rules, the flow path must be free of oil and grease. We can supply oxygen cleaned hardware with certificates if your site requires that.

Calibration Data That Matters

Calibration is not just a sticker on the box. For a medical oxygen flow meter we calibrate at 20 degrees Celsius and 101.325 kPa. The scale is usually marked in liters per minute. For an industrial oxygen mass flow meter we calibrate against a reference flow standard and provide a printout with the serial number.

We can also calibrate at your process pressure. In practice this matters when the line pressure is above 6 bar. Most engineers skip this part during first purchase and then find the reading drift at site.

Typical accuracy for our oxygen flow meters is plus or minus 1.5 percent of full scale. For thermal mass flow meters it is plus or minus 1 percent of reading plus 0.5 percent of full scale. Output options include 4-20 mA, HART, RS485, and pulse.

Medical Gas Applications

Hospitals and clinics use oxygen flow meters for ward outlets, anesthesia machines, ICU ventilators, and ambulance regulators. The most common body is a brass or aluminum variable area meter with a clear cover. Flow range is often 0 to 15 liters per minute. Inlet pressure can be 4 bar from a manifold or cylinder regulator.

We also supply oxygen flow meters for hyperbaric chambers and veterinary clinics. These units need a sealed case and a needle valve that does not shift after vibration.

Last year a customer in Vietnam asked us for 80 units for a new private hospital project. They sent oxygen line pressure of 4.2 bar, flow range 0 to 10 liters per minute, and wall outlet type. We matched the inlet fitting and shipped with calibration sheets.

Industrial Gas Applications

Industrial users consume oxygen in steel cutting, glass melting, ozone generation, wastewater treatment, and aquaculture. Flow rates are higher than medical lines. A DN25 or DN50 thermal mass flow meter is common for these jobs.

A paint manufacturer in Southeast Asia uses oxygen to feed a thermal oxidizer. They measure 60 to 180 standard cubic meters per hour at 5 bar. We supplied a DN50 inline flow meter with 4-20 mA HART and local display.

For welding gas distribution you may need a compact variable area flow meter on each drop. We can supply panel mounted units with inlet and outlet fittings ready for 6 mm tube.

Common Installation Problems

One problem is backpressure. A variable area oxygen flow meter should be installed vertically and the outlet should not be choked by a small downstream nozzle. If backpressure is too high, the float will read low.

Another problem is contamination. Oxygen lines must not have oil, grease, or loose PTFE tape. We clean the wetted parts before shipment. You should do the same at site.

Here is the thing. We have seen this on customer sites many times. A customer installs a thermal mass flow meter too close to a pressure regulator. The flow is unstable and the reading jumps. We recommend 10 diameters of straight run upstream and 5 diameters downstream for most gas mass flow meters.

How to Get a Quote

For a fast price quote send us the gas type, oxygen purity, flow range with units, line pressure in bar, temperature in degrees Celsius, pipe size in DN, and connection type.

You can reach Silver Automation Instruments at Tel: +86-25-68650347 or WhatsApp: +86-25-52155837. For urgent requests use WeChat: +86 15365082610. On the website flow-meter.com.au you can see full product data for gas flow meters.

Silver Instruments supplies both standard and custom oxygen flow meters. If you need a lead time estimate, tell us the quantity and destination port. We ship to Southeast Asia, Oceania, Latin America, Africa, and the Middle East.

Five Questions Engineers Ask About Oxygen Flow Meters

Question: Can the same flow meter work for oxygen and air? Answer: In many cases yes, but the calibration gas and cleaning rules differ. Oxygen service needs oxygen clean parts and no oil. We supply dedicated oxygen flow meters with certificates.

Question: What is the typical lead time for 20 units? Answer: For standard variable area oxygen flow meters we ship within 7 to 12 working days. Larger inline thermal mass flow meters may take 15 to 20 working days depending on size and output.

Question: Do you offer 4-20 mA output on low flow medical units? Answer: Yes, we can add a transmitter to a variable area flow meter. Some hospitals use this for remote monitoring of ward oxygen supply.

Question: Can you calibrate for inlet pressure higher than 6 bar? Answer: Yes. Send the actual pressure and gas temperature. We calibrate the scale or the transmitter for that condition.

Question: What maintenance does an oxygen flow meter need? Answer: Keep the glass tube or sensor clean and check for leaks. For thermal mass flow meters, clean the sensor probe once a year if oxygen is not pure or if the line has moisture.

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