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FTI Flow Meter Range: Sizing Flow Technology Turbine Sensors for Aerospace and Metrology Systems
Quick Answer: Pick an FTI turbine flow meter by matching your minimum and maximum flow rate to the sensor bore, not to the line size. Keep the flow range inside 10 percent to 90 percent of the published meter range for linear output. Most aerospace fuel rigs and metrology calibration benches need DN4 to DN10 sensors with 0.1 percent repeatability and frequency output.
Silver Automation Instruments has quoted turbine flow meter replacements for aerospace hydraulic stands and metrology labs in Southeast Asia, Australia, and the Middle East. The same sizing rules apply to FTI Flow Technology turbine sensors and compatible alternatives. We see many engineers oversize the meter first. That leads to low flow cutoffs, poor pulse resolution, and unstable data at the bottom end. We have seen this on customer sites in Vietnam and Mexico.
In practice, a turbine sensor works best when the fluid moves fast enough to spin the rotor but not so fast that bearing wear increases. For jet fuel and hydraulic oil, viscosity below 20 cP gives a wide linear range. For calibration oil above 50 cP, the minimum flow moves up. Check the kinematic viscosity at your operating temperature before selecting any flow tube.
Key Sizing Parameters for FTI Turbine Flow Meters
Start with the actual flow range. Do not size off the process pipe inside diameter alone. A DN25 pipe can carry 1 L/min during calibrations and 80 L/min during flush cycles. The FTI sensor must cover both. In that case, a DN10 meter with a 0.1 to 40 L/min range may not work. You would need a dual-range setup or a smaller bypass loop for the low flow portion.
Pressure and temperature set the material and seal limits. Aerospace test stands often run fuel at 20 bar and 40 °C. Hydraulic benches can reach 250 bar and 80 °C. The turbine body in 316 stainless steel with PTFE seals handles most hydrocarbon fuels, mineral oils, and Skydrol type fluids. Specify shaft material, bearing type, and O-ring compatibility with the test fluid.
Output signal matters for metrology systems. Frequency output from the magnetic pickup gives the highest resolution pulse train. A 10-blade rotor in a DN6 meter can produce 3000 pulses per liter in some models. That kind of pulse count makes turbine sensors useful as master meters on calibration benches. If the control system only accepts an analog signal, use a flow transmitter with 4-20 mA HART output and totalizer.
Aerospace Flow Meter Sizing Example
A customer in Vietnam asked us about a fuel flow test stand for aircraft engine components. He needed 0.5 L/min minimum for idle leakage checks and 25 L/min maximum for full flow recirculation. Fuel was Jet A-1 at 25 °C and 10 bar. We recommended a DN6 turbine sensor with a linear range of 0.3 to 30 L/min. The meter included a frequency output and a local totalizer. That setup kept all readings above the 10 percent cutoff and below 90 percent of full scale.
Most engineers skip this part. Turbine meters have a K-factor that is not perfectly flat across the whole range. At the bottom 5 percent, slip and viscous drag eat repeatability. At the top 5 percent, bearing load and pressure drop increase. So the usable range is not the published minimum to maximum. It is the linear section of the calibration curve. Aerospace and metrology users should ask for the actual calibration data, not only the datasheet.
Metrology Systems and Calibration Benches
For ISO 17025 calibration benches, repeatability and pulse per liter resolution are more important than absolute accuracy. A turbine sensor with 0.1 percent repeatability can serve as a transfer standard if it is calibrated against a higher level master meter. We have supplied DN4 and DN6 turbine flow meters to calibration labs in Thail
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Metrology systems also need stable inlet conditions. Turbine sensors are sensitive to swirl and flow profile. Install at least 10 pipe diameters of straight run upstream and 5 diameters downstream. If the available space is tight, use a flow straightener. For DN4 sensors in a bench, a small straightening tube is often enough.
FTI Flow Meter Range Selection Table
Do not select a sensor model from a table without checking your fluid. The following ranges are typical for light hydrocarbon oil and low viscosity fuel at 20 to 40 °C. For higher viscosity, shift the minimum upward.
DN4: 0.05 to 10 L/min. Good for small leak test rigs and low flow metrology loops.
DN6: 0.3 to 30 L/min. Common for fuel test stands and calibration benches.
DN10: 0.5 to 75 L/min. Good for hydraulic return lines and larger metrology circuits.
DN15: 2 to 200 L/min. Used for test stand supply headers and fuel recirculation skids.
These numbers assume clean liquid with viscosity under 20 cP. For water, the low end can go lower because water viscosity is around 1 cP. For heavy hydraulic oil at 100 cP, the minimum flow may double.
If you need a high pressure version for 350 bar hydrogen or helium gas, a turbine sensor is not the first choice. Coriolis mass flow meters or ultrasonic meters may be better for gas. For liquid fuels and light oils, the FTI style turbine sensor remains practical and cost effective.
How to Request a Firm Sizing Quote
Send Silver Automation Instruments the following data. Fluid name, viscosity in cP or cSt at operating temperature, minimum and maximum flow rate in L/min or kg/h, pressure in bar, temperature in °C, pipe size in DN, and required output signal. That is enough to propose a meter model, fitting style, and price.
For aerospace projects, also tell us the test fluid specification, required accuracy class, and whether the bench is portable or fixed. Portable fuel rigs often need compact DN6 sensors with BSPP or AN fittings. Fixed metrology systems may need welded or flanged connections and a remote display.
FAQ
What is the typical flow range for FTI turbine sensors in aerospace fuel test stands?
Most aerospace fuel test stands use DN6 to DN10 turbine sensors with a linear range from 0.3 L/min to 75 L/min. Larger supply headers move to DN15 with 2 to 200 L/min.
Can FTI turbine flow meters handle low viscosity fluids like Jet A-1 or water?
Yes. Turbine sensors perform well with Jet A-1, water, diesel, and light calibration oils below 20 cP. Low viscosity provides a wide linear range and strong rotor response.
What output signal should I specify for a metrology system?
Use frequency or pulse output for the highest resolution and totalizing. Add a 4-20 mA HART transmitter if the bench PLC only accepts analog signals.
How do I avoid oversized turbine meters in small DN lines?
Size the meter to your actual flow range, not the line size. If the minimum flow is below 10 percent of the meter range, choose a smaller DN sensor or install a bypass loop.
Does Silver Automation Instruments supply turbine sensors for ISO 17025 calibration benches?
Yes. We supply turbine flow meters and compatible signal converters for calibration benches in Australia, Southeast Asia, and the Middle East. Contact Tel: +86-25-68650347 or WhatsApp: +86-25-52155837 with your flow data.
Quote data checklist
Send us your pressure (bar), temperature (°C), pipe size (DN), flow range in L/min or kg/h, fluid name, and output signal. A clear answer usually takes one working day. Silver Automation Instruments, Tel: +86-25-68650347, WhatsApp: +86-25-52155837, WeChat: +86 15365082610.
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