Exact Flow: Recognized for Superior Accuracy Worldwide in Aerospace Applications

Exact Flow provides solutions to aircraft manufacturers, engine developers and test laboratories by offering unique, integrated flowmeter system packages. Our custom products are developed around the highly accurate dual rotor turbine flowmeter, which eliminates the need for flow straighteners and provides additional information such as bearing diagnostics, bi-directional flow readings, and pressure and temperature sensor data.

In addition, our exceptionally accurate, integrated ExactComp EC80 Flow Computer provides multiple outputs delivering ±0.25% of reading system accuracy, and ±0.02% repeatability over an extended universal viscosity curve (UVC) flow ranges up to 60:1.

Exact Flow's integrated systems reflect the most advanced turbine flowmeter technology, incorporating flow, temperature and pressure measurements in one compact sensor package that can be installed almost anywhere onboard the aircraft. From Very Light Jet (VLJ) aircraft to advanced military fighters and unmanned aerial vehicles (UAVs), Exact Flow's flow measurement solutions are suited for virtually every type of aerospace application.

Examples include:

General Atomics Avenger (Predator C)

Exact Flow was the flowmeter supplier of choice for the General Atomics Avenger (formerly Predator C), an unmanned combat air vehicle (UCAV) built by General Atomics Aeronautical Systems for the United States military. Unlike the previous MQ-1 Predator and MQ-9 Reaper (Predator B) drones, the Avenger is powered by a turbofan jet engine, and its design includes stealth features such as internal weapons storage and an "S" shaped exhaust for reduced heat and radar signature. The Avenger can cruise at 50,000 feet and perform multiple tasks from reconnaissance to attack roles.

For the Avenger project, Exact Flow provided a Model EF3601 Dual Rotor Turbine Flowmeter and an integral IFC15 flow computer with special outputs to handle engine fuel measurements. The Model EF3601 employs embedded pickoffs in order to withstand engine vibration. It's compact, lightweight aluminum housing was designed to utilize the existing bolthole pattern in the Avenger's engine flowmeter mounting bracket. This small packaging also allowed the meter to be used with no modifications to the engine fuel piping – and without the need for flow straighteners.

Joint Strike Fighter STOVL

The Exact Series Dual Rotor Flowmeter is used to monitor for hydraulic system leaks. Having dual rotor flowmeters allows for bearing checks, bidirectional flow measurement, and integral temperature sensors all in a high shock design. The Exact Dual Rotor Flowmeter system measures the flow output and return to ensure no leaks in the entire hydraulic system.

Features:

• Flight critical safety level
• Full redundancy
  

  – Four pickoffs per dual rotor
  – Two pickoffs for quadrature

• 10 flow signals and four temperature sensors
• Software certified to: DO-178B Level A
• Designed to: MIL-STD 704E
• Tested to: MIL-STD 461E and MIL-STD 810

X-51 Waverider Scram Jet Cruise Missile

The X51 Waverider is capable of precision strikes anywhere in the world. Powered by a Pratt & Whitney Rocketdyne SJY61 scramjet engine, it is designed to ride on its own shockwave and accelerate to Mach 6+. Carried under the wing of a B52 gives high altitude launches and leads the way for new pinpoint tactical missile strikes.

The Exact Series offers a fully qualified dual rotor flowmeter with integral flow computer and pressure sensor mount.

Features:

• Exact Series Dual Rotor measures engine fuel
• Standard hydrocarbon fuel JP7
• Flow straighteners not required
• Intergal Flow Computer with UVC calibrations
• Unmanned missile, capable of Mach 6+
• Mounts a four-pack pressure sensor stack to minimize space

Business Jet Fuel

Exact Series Flowmeters lend themselves to limited installation areas having no room for flow straighteners. This innovative compact design packs a powerful fuel processing capability with flow compensation and signal processing.

Features:

• Dual rotor fuel flowmeter with integral miniaturized flow computer
• Housing clamps over the flowmeter body
• Integral pickoff and temperature sensor
• Flow straighteners not required

Boeing Air Tanker

Hydraulic high pressure applications require special end fittings and packaging requirements fully met by the Exact Series Dual Rotor Flowmeter. No flow straighteners are required when using the dual rotor flowmeter, while averaging dual rotors provides ±0.02% repeatability. Having an integral flow computer, embedded pickoffs and temperature sensors enables a compact design to withstand high vibration.

Features:

• Dual rotor hydraulic system flowmeter
• Proof pressure: 4500 psi
• Custom end-fittings for manifold
• Contains amplifiers for RF carrier pickoffs
• Includes software interface (GUI)
• Compensates for linearity, viscosity and density
• Averaging
• RTD temperature input/output
• Programmable rotor blade and period averaging
• Fast response: 0.8 to 2.0 mS + period measurement
• Operating temperature: - 65 to 185° F