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Inline Oxygen Flow Meter: Thorpe Tube and Needle Valve Regulators for Safe Laboratory Distribution
Quick Answer: Silver Automation Instruments supplies inline oxygen flow meters with Thorpe tube indication and needle valve regulation for laboratory gas distribution. These meters give direct L/min readings with no external power. Standard ranges are 0 to 5 L/min, 0 to 15 L/min, and 0 to 30 L/min at inlet pressures from 2 to 4 bar.
Laboratory oxygen distribution needs flow control that is easy to read and easy to adjust. A Thorpe tube flow meter has a tapered glass tube and a metal float. The operator reads the float position against the scale. The needle valve sets the flow. This inline design fits directly into a point-of-use line. It does not need bypass piping. Silver Instruments sells these flow meters to chemistry labs, research benches, gas sampling panels, and universities across Southeast Asia, Oceania, Latin America, Africa, and the Middle East.
How a Thorpe Tube Inline Oxygen Flow Meter Works
Oxygen enters the bottom connection of the meter. It flows through the needle valve. The gas pushes the float upward inside the tapered tube. A higher flow lifts the float to a wider section of the tube. The float stops where the gas force balances its weight. The operator reads the flow at the top of the float. No power supply is needed. No transmitter is needed.
Most engineers skip this part but oxygen service is not standard air service. Oxygen reacts with oil, grease, and many polymers. Silver Instruments cleans oxygen wetted parts before assembly. We use oxygen compatible seals. We do not use standard air flow meters for oxygen lines. A lab in Vietnam learned this the hard way last year. They installed an air flow meter on an oxygen manifold. The seal degraded and the unit leaked within two weeks. We replaced it with an oxygen inline flow meter with FKM seals and a stainless steel valve stem.
Needle Valve Regulator Design and Material Options
The needle valve regulator is built into the flow meter body. A fine thread on the stem gives stable flow adjustment. The stem material is 316 stainless steel. The valve seat is brass or stainless steel. The tube is borosilicate glass. A polycarbonate shield protects the glass tube. End connections can be 1/4 inch NPT female, 3/8 inch NPT female, or push-to-connect for 6 mm and 8 mm tubing. The standard working pressure limit is 10 bar. The recommended inlet pressure for laboratory distribution is 3 bar. The maximum gas temperature is 60 °C. The standard accuracy is plus or minus 5 percent of full scale.
Silver Instruments model SI-OTF-TT15 is a common choice for lab benches. It has a 0 to 15 L/min scale. The valve stem is stainless steel. The body is brass with electroless nickel plating. The tube shield is clear polycarbonate. It accepts 1/4 inch NPT inlet and outlet connections. We also offer model SI-OTF-TT30 for 0 to 30 L/min and SI-OTF-TT05 for low flow from 0 to 5 L/min. The low flow model gives better resolution below 1 L/min.
Common Ranges and Accuracy
Three ranges cover most laboratory oxygen distribution tasks. The 0 to 5 L/min range works for cell culture and small reactors. The 0 to 15 L/min range fits general bench work. The 0 to 30 L/min range handles larger gas analyzers and multiple test stations. Accuracy is plus or minus 5 percent of full scale at 20 °C and 1 atm reference. Repeatability is plus or minus 2 percent. At 0.5 L/min the floa
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Typical Laboratory Distribution Setups
The inline oxygen flow meter sits after a point-of-use pressure regulator. The main oxygen header runs at 5 bar. The regulator drops the pressure to 3 bar. The flow meter controls the flow to a reaction vessel, a gas analyzer, or a sample conditioning panel. Most lab manifolds use DN15 or DN20 piping with point-of-use adapters. A university chemistry lab in Malaysia ordered 20 units of the SI-OTF-TT15 last year. They used 1/4 inch compression fittings on 6 mm stainless steel tubing. The installation took one day. The lab manager later ordered 10 more units for a second building. That is the pattern we see often. Start with standard flow meters. Add more when new benches are commissioned.
A water quality lab in Chile uses inline oxygen flow meters for BOD analyzers. They run 0 to 5 L/min units at 2.5 bar inlet pressure. The operators read the float position through the polycarbonate shield. The needle valve stays set for months. Because the design has no electronics, maintenance cost is low. The main requirement is clean dry gas. Remove moisture and particulate before the flow meter.
Why Choose Silver Instruments for Inline Oxygen Flow Meters
We ship standard models in 7 to 10 days. Custom scales and connection sizes take 15 days. Calibration reports are available for laboratory audits. We supply replacement tubes, floats, seals, and shields. We can match your manifold thread type and tube outer diameter. Send us your gas type, flow range, inlet pressure, temperature, and tube fitting size. We will recommend a model and send a quote within 24 hours.
Contact Silver Automation Instruments for oxygen flow meter selection. Tel: +86-135-1213-1526. WhatsApp: 86-135-12131526. WeChat: +86 13512131526. Tell us your required L/min range and connection type. We will confirm the right inline oxygen flow meter for your laboratory distribution line. Online catalog: flow-meter.com.au
Frequently Asked Questions
What is a Thorpe tube oxygen flow meter?
A Thorpe tube flow meter is an inline device with a tapered glass tube and a float. Gas enters from the bottom. The float rises with flow. The operator reads flow directly on the tube scale. A needle valve controls the flow rate.
Can these flow meters be used with humidified oxygen?
No. Use dry gas only. Moisture affects the float movement and can cause scale fogging. Install a moisture trap upstream if the oxygen line may carry condensation.
What inlet pressure should I use?
Use 2 to 4 bar for stable operation. The standard working pressure limit is 10 bar. Regulate the line pressure before the flow meter. Do not connect the meter directly to high pressure cylinder output.
Do you provide calibration certificates for laboratory audits?
Yes. We can provide a calibration certificate for each unit. The certificate shows the test points, reference standard, and date. This supports ISO lab audits and safety inspections.
What connection sizes are available?
We offer 1/4 inch NPT female, 3/8 inch NPT female, and push-to-connect fittings for 6 mm or 8 mm tubing. Other thread types can be quoted on request.
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