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Oxygen Low Flow Meter: Pediatric and Micro-Therapy Precision Regulators
Quick Answer: Silver Automation Instruments supplies oxygen low flow meters and precision regulators built for pediatric and micro-therapy gas delivery. Flow ranges cover 0.05 LPM to 5 LPM with adjustment accuracy of 0.1 LPM on most stocked models. Send us your inlet pressure, outlet pressure, flow range in LPM, and connector type for a same-day quote.
Most standard oxygen flow meters have a 0 to 15 LPM scale. That range is too coarse for neonatal and pediatric use. A small turn of the knob can change flow by 1 LPM. For a 3 kg infant that is a large oxygen dose shift.
Silver Automation Instruments started receiving requests for low flow pediatric regulators from hospital distributors in Southeast Asia and the Middle East three years ago. The original demand came from a pediatric hospital in Manila. Their biomedical team needed a stable 0.2 LPM setting for long term oxygen therapy.
Why pediatric oxygen flow control needs a precision regulator
Pediatric oxygen therapy often runs between 0.1 LPM and 2 LPM. Neonatal ICU protocols may require 0.2 LPM for hours. A standard Thorpe tube flow meter cannot hold that set point if the inlet pressure drifts.
Our low flow meters use a fine pitch needle valve. The knob rotation is about 270 degrees from closed to full flow. So one degree of rotation changes flow by 0.02 LPM on a 0 to 3 LPM unit. That gives the nurse enough resolution to set 0.3 LPM without overshoot.
We have seen this on customer sites many times. A nurse taps the knob and then overcorrects. The patient SpO2 swings. A precision regulator with a locking ring stops that drift.
Key specifications and model pairing
We stock two common body types. Model LF-03-P covers 0 to 3 LPM. Model LF-05-P covers 0 to 5 LPM. Both have a clear polycarbonate tube with a stainless steel float. The scale is dual marked in LPM and cc/min for micro-therapy.
Inlet pressure is 0.5 to 4 bar. Outlet pressure is fixed at 0.3 bar unless you request a different setting. Flow accuracy is plus or minus 0.1 LPM or plus or minus 5 percent of reading, whichever is larger.
Connections are available as 1/8 inch NPT female, 6 mm hose barb, or DISS 1240 for oxygen. The knob has a push to set mechanism. After you set flow, the knob can be locked with a small side screw.
For oxygen service the body is nickel plated brass. Internal wetted parts are PTFE and EPDM. This avoids oil based lubricants. A stainless steel 316 version is available for clinics that disinfect with aggressive agents.
Oxygen cleaning and packaging
Every unit is degreased before assembly. We flow nitrogen through the body after cleaning. Then the flow meter is bagged in an oxygen safe film. Do not use general thread tape on th
Ask for a certificate of clean if your hospital requires it. We can mark each unit with a lot number and cleaning date. A distributor in Dubai ordered 200 units last year with lot level traceability.
Common problems from the field
In practice, a low flow meter will drift if the inlet pressure is not regulated. Do not connect it directly to a cylinder without a pressure regulator. Our units expect a stable inlet between 0.5 and 4 bar.
Another issue is condensation inside the tube. Oxygen from a cold cylinder can create droplets on the polycarbonate wall. That makes the float stick. To avoid this, let the cylinder come to room temperature before use. Or install a small moisture trap upstream.
Most engineers skip this part. The float material matters. We use stainless steel instead of aluminum because aluminum can react with moisture in oxygen service. That causes scale buildup and sticking.
FAQ
Question: What flow range do I need for a neonatal ward?
Answer: Most neonatal applications use 0 to 3 LPM. If you also run pediatric recovery, choose 0 to 5 LPM. We can supply one unit with dual scales.
Question: Can you match inlet and outlet connections for our existing manifold?
Answer: Yes. Send us the thread type or a photo of the connector. We can supply 1/8 inch NPT, 6 mm barb, or DISS 1240 outlets. Thread adapters are available for older panel mounts.
Question: How do you prevent flow drift on oxygen concentration changes?
Answer: The needle valve is fine pitch and the inlet pressure needs to stay within 0.5 to 4 bar. We test each unit at 3 bar with nitrogen. The lock screw on the knob prevents accidental changes.
Question: What is the typical delivery time?
Answer: Stock models LF-03-P and LF-05-P ship in 3 to 5 working days. Custom flow scales or stainless steel bodies take 15 to 20 working days. We ship by DHL, FedEx, or sea freight to your country.
Question: Do you provide certificates for oxygen use?
Answer: Yes. We provide a cleaning certificate and a material list with each batch. For hospital tenders we can also provide a test report showing flow accuracy at 0.1, 0.5, 1.0, 2.0, and 3.0 LPM.
Contact and pricing data
Tell us your gas type, inlet pressure in bar, outlet pressure in bar, flow range in LPM, and connector type. We will reply with a price and lead time within 12 hours.
Tel: +86-25-68650347
WhatsApp: +86-25-52155837
WeChat: +86 15365082610
Our team has supplied low flow oxygen meters to pediatric hospitals in Manila, Jakarta, and Nairobi. If you need a sample for evaluation, ask for one unit at distributor pricing.