Digital seven-hole probe system

High-precision, integrated digital seven-hole probe system for directional velocity measurement

This fully self-contained, high-precision and robust flow measurement solution provides a compact, low-cost alternative to optical flow diagnostics. Ideal for use in wind-tunnel and motorsport applications, this probe offers industry-leading functionality at a fraction of the cost. Quick-change probe stings are also now offered on all digital multihole probes, for maximum flexibility and easy maintenance.

This system provides three components of velocity, together with absolute static pressure, local fluid temperature and humidity (for density corrections) and an IMU for automatic alignment and vibration warning. A low-profile, in-line sensor package (measuring under 18 mm in diameter) minimizes interference, and an integrated static pressure ring in the probe sting enables differential measurement directly against local static pressure for highest precision.


Digital seven-hole probe system

Wind-tunnel laboratory

Wind-tunnel testing

With 24-bit pressure measurements, integrated environmental and alignment sensors, this system is one of the most sophisticated and functional fluid velocity probes on the market. Available with ranges down to 160 Pa and with an integrated fluid temperature sensor, this system is equally ideal for low- and high-speed aerodynamics.

Formula 1 cars going around a hairpin turn


With package dimensions and communications similar to other five-hole products currently available, this system offers a high-performance, high-precision alternative for wind-tunnel scanning. High fabrication tolerance and factory sensor calibration also allows a degree of probe interchangability minimizing the need for time-consuming recalibrations.

Reaper UAV with canopy removed

Unmanned aircraft

This enclosed system may equally be used on light UAVs, including the probe and instrumentation in a single component for ease of installation and use. The low mass, range and power consumption mean that this system is well-suited to low-altitude, low-speed operation.


Seven-plus-one hole probe

Seven-hole probe with direct local static reference ring, for best precision

Temperature sensors

Systems includes a local air temperature sensor, as well as automated temperature correction

Absolute static pressure sensor

Absolute static pressure  sensors for high-accuracy data reduction

Inertial positioning sensor

Inertial positioning sensor for automated probe alignment and vibration warn

Humidity sensor

Humidity sensor for density correction and condensation warn

24 bit, 1000 Hz data acquisition

High-precision digital outputs, streaming via USB2.0, RS232 or UDP Ethernet

Wide operating range

Differential pressure sensitivities available down to 160 Pa full-scale, and temperature-rated between 5° C and 60° C

Compact, in-line sensor package

Compact, in-line sensor package measures 18 mm in diameter x 150 mm long

Range of probe diameters

Quick-change probe sting diameters down to 2 mm OD available

Product Details

Capabilities and performance

The system uses high-fidelity pressure transducers with built-in temperature compensation and 24-bit ADC, operating at 1 kHz in sample-and-hold mode. Sensor calibration in carried in on-board memory, and data streams in user-readable ASCII format, in SI units, for simple integration.

Communications may be over USB2.0, RS232 or UDP Ethernet, depending on customer requirement.

System specifications

  • Physical dimensions: sensor package approx. 18 mm dia x 150 mm
  • I/O: Data streaming as single-precision floats in SI units; system supports stand-alone Tx/Rx streaming output, USB operation or network communications (RS-485, RS-232, Ethernet UDP available with additional signal converter)
  • Power: 6- 24 VDC, <60 mA; min. 290 mW
  • Reference pressure: port provided for probes not including an integrated static ring
  • Digital resolution: 24-bit pressure, 16-bit environmental and IMU, 1 kHz (equivalent) data acquisition
  • Range: from 160 Pa full-scale; wide range of scales available
  • Temperature: compensation from 5° to 55° C; range may be extended for extreme environments
  • Total uncertainty: ~0.5% full-scale
  • Absolute pressure sensor specification: 300-1100 Pa FS, +/- 0.12 Pa
  • Relative humidity sensor specification: 0% – 100% RH, +/- 1%
  • IMU specification: 6-axis, range/accuracy 2g/0.061 mg; 125 dps/3.9 mdps
  • System requirements: Win7 or later, minimum 3GHz & 4Gb RAM recommended

Additional custom modifications available

  • Variety of probe geometries available
  • External heating and cooling sleeves may be integrated for use in cryogenic or combustor applications
  • Battery power and wireless telemetry module for remote operation
  • Custom enclosure design service available
  • Custom software and driver development service available
  • Calibration service available
  • Extended product support and warranty available