Fluid Measurement Probes

Digital 7-Hole Probes

Self-contained digital 7-hole probes that measure three velocity components, with fast-response and miniature options for wind tunnel, motorsport and UAV testing.

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Three Velocity Components From One Self-Contained Probe

A digital 7-hole probe combines a multi-hole probe head with onboard pressure sensors and analog-to-digital conversion in a single unit, so there are no pressure lines to run to a separate scanner. It measures three components of velocity, absolute static pressure, local fluid temperature and humidity, and includes an inertial sensor for automatic alignment and vibration warning.

Three configurations are available: a standard in-line system with quick-change probe stings, a fast-response version with dynamic calibration for turbulence measurement, and a miniature version about 12 mm in diameter for tight installations and UAV flight control.

Digital 7-hole probe with hooked stem and integrated electronics body

At a Glance

Three velocity components plus static pressure, temperature and humidity
24-bit data acquisition at 1000 Hz (standard and fast-response)
Sensor package 18 mm diameter by 150 mm long (standard and fast-response)
Miniature version about 12 mm diameter by 93 mm long
USB 2.0, RS232 or UDP Ethernet outputs

Specifications

Digital 7-Hole Probe Specifications

Manufacturer specifications for the standard, fast-response and miniature configurations. Accuracy, frequency response, extended ranges and custom stings are confirmed at quotation.

Probe type	7-hole probe with integrated electronics; the standard system uses a 7-plus-1 hole head with a local static reference ring
Configurations	Standard in-line system, fast-response system with dynamic calibration, and miniature system
Measurements	Three velocity components, absolute static pressure, local fluid temperature and humidity; the fast-response version also reports turbulence intensity
Data acquisition	Standard and fast-response: 24-bit, 1000 Hz. Miniature: 24-bit, 150 Hz, simultaneous
Differential pressure sensitivity	Down to 160 Pa full scale (standard and fast-response)
Sensor package	18 mm diameter by 150 mm long (standard and fast-response). About 12 mm by 93 mm (miniature)
Probe sting	Quick-change stings down to 2 mm OD (standard). Miniature: straight, L-shaped and plug configurations, including 3D-printed steel stings
Operating temperature	5°C to 60°C (standard and fast-response)
Outputs	USB 2.0, RS232 or UDP Ethernet; Ethernet requires a communications adaptor. Miniature: USB and UART, with a CAN adaptor available
Materials (miniature)	Nylon or hardened stainless steel
Software	Data conversion software and a development kit for NI LabVIEW; NI LabVIEW run-time and NI-VISA are required

Why K-Tec Systems

More Than a Probe Supplier

K-Tec Systems manufactures the sensing and cabling around the probe in Ferndale, Michigan, so one U.S. team can support the whole measurement chain, from thermocouples and RTDs to wire harnesses.

Manufactured and supported in the U.S.

K-Tec Systems builds custom thermocouples, RTDs, wire harnesses and test stands at our Ferndale, Michigan, facility. The probe, the temperature sensing and the cabling can be specified together, with one U.S. team behind the order.

Flow and temperature at the same point

K-Tec thermocouples and RTDs can be integrated into compatible probe designs, so total pressure and temperature are measured at the same location.

Registered for government and defense work

CAGE Code 4W0S0. WBENC and WOSB certified woman-owned small business. CMMC Level 2.

Thermocouples produced to ISO/IEC 17025 standards

Thermocouples for your test article are produced to ISO/IEC 17025 standards at K-Tec Systems.

Applications

Where Digital 7-Hole Probes Are Used

Wind tunnel testing

Three-component velocity measurement for low- and high-speed aerodynamics, without pressure lines.

Motorsport

Package dimensions and communications similar to other 5- and 7-hole probes, with factory calibration that allows probe interchangeability.

UAV flight instrumentation

Turbulent flow measurement on light unmanned aircraft, with a polymer enclosure option and a UART interface on the miniature version.

FAQ

Digital 7-Hole Probes: Frequently Asked Questions

How is a 7-hole probe different from a 5-hole probe?

The manufacturer states that seven holes give increased angular resolution and lower uncertainty than five-hole probes. For standard 5-hole configurations see 5-hole probes.

Does it need pressure lines or a separate scanner?

No. The pressure sensors and analog-to-digital conversion are inside the probe, which streams data over USB 2.0, RS232 or UDP Ethernet; Ethernet requires an additional communications adaptor. The miniature version has onboard USB and UART, with an optional CAN adaptor.

What is the fast-response version for?

Turbulent flow measurement. It is dynamically calibrated and reports turbulence intensity along with three velocity components at 1000 Hz data acquisition. A frequency response figure is confirmed at quotation.

Can the probe tip and sting be changed?

Yes. The standard system uses quick-change stings down to 2 mm OD, and the fast-response probe stings can be removed for maintenance or purge. The miniature version supports straight, L-shaped, hook-shaped and plug configurations.

What finishes and digital options are available on the 3D-printed probes?

The manufacturer offers its additively manufactured stainless steel probes in raw, coarse and fine surface finishes, in 7-hole, yaw and rake designs or a custom geometry. Probes can be supplied with barbed stings for use with a separate scanner, or as a fully digital system with a miniature 8-channel pressure scanner in the probe body.

How do I order one?

Contact K-Tec Systems with your application, speed range and installation constraints. Configuration, lead time and price are confirmed at quotation.

Not sure which probe fits your test? See the full probe range or call 248-414-4100.

Other Probe Types

All probes are supplied in the U.S. by K-Tec Systems. Scroll or use the arrows to see every probe type, or visit the fluid measurement probes overview.