『Key Instruments Water Flow Meter Specifications: Inline Low-Flow Rotameters for Medical and Machine OEMs』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
Key Instruments Water Flow Meter Specifications: Inline Low-Flow Rotameters for Medical and Machine OEMs
Quick Answer: Silver Automation Instruments supplies inline low-flow rotameters that match many Key Instruments water flow meter specifications for OEM builds. Standard ranges cover 0.02 L/min to 10 L/min for water and 0.05 L/min to 50 L/min for air. Accuracy is ±2 percent of full scale on 100 mm and 150 mm tubes. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range for a quote.
What An Inline Low-Flow Rotameter Does In An OEM Build
Inline low-flow rotameters give a direct visual indication of coolant, gas, or liquid flow. They do not need external power. A float moves inside a tapered tube. The operator reads the flow from the top edge of the float. Medical OEMs use them on oxygen mixers, anesthesia gas sampling lines, and dialysis rinse ports. Machine builders use them on spindle coolant loops, laser tube cooling, and sealing water lines.
Silver Instruments builds these meters in acrylic, polysulfone, and 316L stainless steel. Most OEMs select a panel mount or inline body with female threads. Tube lengths are short, usually 65 mm to 150 mm. The compact size fits inside enclosures and control cabinets. Because the meter is mechanical, there is no wiring and no signal drift.
Key Specifications That Matter For OEM Selection
Here is the thing. Most buyers paste a Key Instruments part number and expect a mechanical match. The critical specs are flow range, connection size, valve option, and tube material. We see this daily on RFQs from Singapore, Vietnam, and Brazil.
Flow ranges start at 0.02 to 0.2 L/min for water and 0.1 to 1 L/min for air. Mid ranges cover 0.5 to 5 L/min water and 1 to 10 L/min air. High ranges go up to 10 L/min water and 50 L/min air. Turndown is 10 to 1. Accuracy is ±2 percent of full scale for 100 mm and 150 mm tubes. Shorter 65 mm tubes give ±4 percent of full scale. Repeatability is ±0.5 percent of full scale. Maximum pressure is 10 bar for acrylic and 20 bar for stainless steel. Maximum temperature is 65 °C for acrylic and 120 °C for stainless steel. Wetted parts include acrylic or polysulfone tube, 316L stainless steel or brass end fittings, PTFE and Viton seals. Connection options are 1/8 NPT, 1/4 NPT, G1/8, G1/4, 6 mm push in, and 8 mm barb.
Medical OEM Design Constraints
Medical and analytical OEMs often ask about oxygen cleaning, USP Class VI materials, and particle limits. Silver Instruments supplies polysulfone body meters for medical gas and water lines. This material is lighter than metal and does not corrode with deionized water. We can mark the scale in L/min, mL/min, SCFH, or percent. A ventilator maker in India asked for 0 to 15 L/min air with a 1/8 NPT inlet and a low pressure drop. We delivered 200 units with laser marked scales and individual serial numbers. The total pressure drop was under 20 mbar at full flow.
In practice, most medical buyers skip the generic catalog meters and go for a fixed range. That avoids the patient safety risk of someone changing the setting. We also provide tamper proof cover screws and fixed valve stems. No exposed glass is used on medical panels. The tube is acrylic or polysulfone, not plain glass.
Machine OEM Applications And Coolant Fl
Machine tool builders in Malaysia and Thailand use inline rotameters on CNC spindle cooling loops. They set the meter for 1 to 7 L/min water, with a 1/4 NPT female body. The scale is printed directly on the tube. Maintenance staff can check flow at a glance. If the float drops below 2 L/min, the operator stops the machine and checks the pump. So the meter becomes a simple mechanical interlock.
Laser cutter OEMs monitor cooling water at 2 to 10 L/min. They prefer brass or stainless steel end fittings and a polysulfone tube. Brass is cheaper for non sanitary water. Stainless steel is for deionized water or aggressive additives. Most machines use a panel cutout of 27 mm diameter. The meter body clips into the front panel. We supply a rubber gasket and two mounting nuts as standard.
Custom Scales, Ranges, And OEM Labeling
Silver Instruments offers private label and custom scale printing. You can send a drawing in PDF or DWG. We engrave your part number on the scale. Minimum order for custom scales is 50 units. Standard colors are blue, black, and red markings. We also supply dual scales, for example L/min and GPM on the same tube. This helps if your end user is in the Philippines or the United States.
Every OEM batch can include a calibration certificate. The certificate lists the reference flow standard, the tube ID, scale range, and accuracy class. We keep records for 5 years. This matters for medical device technical files and ISO 13485 audits.
Lead Time, Packing, And Shipping For OEM Quantities
For 100 to 500 units, lead time is 3 to 4 weeks after drawing approval. For 500 to 2000 units, lead time is 5 to 6 weeks. We pack each meter in a clear poly bag with a foam insert. Bulk packing is 50 units per inner carton. We ship from Nanjing by DHL, FedEx, sea freight, or forwarder. A recent order of 300 polysulfone rotameters to Australia took 12 days by air and cleared customs without issues.
Contact Silver Instruments by telephone at +86-135-1213-1526, WhatsApp at 86-135-12131526, or WeChat at +86 13512131526.
FAQ
Do these rotameters replace Key Instruments water flow meters?
Yes. Many customers send a Key Instruments part number or a photo of the label. We cross reference the flow range, connection, and material to a Silver Instruments model. The physical envelope is usually identical or slightly shorter.
What is the minimum order quantity for OEM rotameters?
Standard inventory models have no minimum order. Custom scales and private label start at 50 units. For large OEM programs, pricing drops at 500 and 2000 units.
Can the meter handle deionized water or medical gas?
Yes. Select a polysulfone or stainless steel body with PTFE and Viton wetted parts. Tell us the media and we will confirm material compatibility. Oxygen service may require special cleaning and packaging.
What accuracy can be achieved for low flow?
Standard accuracy is ±2 percent of full scale. For tube lengths over 100 mm we can reach ±1.6 percent. Calibration certificates are optional and can be included with every batch.
How do I get a quote?
Send your flow range, connection size, tube material, operating pressure, temperature, and estimated annual quantity. We reply within 24 hours on business days.
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