SOLUTION SHEETStandalone Calibrator

Velocity and directional calibration of generic hotwire
probesIntroduction
Calibration of probes is a crucial step in thermal anemometry in general. In particular,
velocity and directional calibration of hotwire probes used for Constant Temperature
Anemometry measurements is a must for the required accuracy during, for example,
turbulence investigations.
Dantec Dynamics has offered the legacy StreamLine Flow Unit and the current
StreamLine Pro Automatic Calibrators for few decades as part of the StreamLine
and StreamLine Pro system families. This meant that this high-accuracy calibration
solution with a traceable velocity calibration certificate was only available for customers
purchasing the legacy StreamLine or the current StreamLine Pro systems.
Due to its overall performance and specifications, the StreamLine Flow Unit andStreamLine Pro calibrators achieved a certain popularity in the market, which led toinquiries about the possibility to calibrate third party hotwire / hotfilm probes, or evenother generic anemometry probes / sensors.

Key benefits• Automatic velocity calibration up to 120m/s using 3 nozzles• Automatic directional calibration with Automatic Directional Calibrator (ADC) option• Calibration of non-Dantec hotwire & hotfilm probes• Calibration of generic anemometry probes & sensors• Customizable calibration file generation

Standalone calibration solution
The standalone velocity calibration functionality is achieved using theStreamLine Pro Automatic Calibrator, the Standalone Calibration Softwaremodule, and a system controller (Desktop PC or Laptop).
For the directional calibration of multiple-sensor probes, either theAutomatic Directional Calibrator (ADC) or the manual pitch/yaw/rollmanipulator should be purchased. The A/D converter board must be in
the list of supported devices in the Standalone Calibration Software, andNational Instruments DAQmx device support is included as standard.

The solution in brief
The schematic diagram below shows the components in the Standalone
Calibration Solution. The StreamLine Pro Automatic Calibrator and the A/Dconverter is connected to the system controller via USB / LAN connection.
The system controller is equipped with a supported A/D board, for example
a National Instruments DAQmx type A/D board, running the Standalone
Calibration Software.

The pitch-yaw manipulator used for
directional calibration of multi-wireprobes.

The A/D converter board reads the voltages from a generic thermal
anemometer (CTA) equipped with generic hotwire / hotfilm probes, andrecords them during velocity and directional calibration events.
The StreamLine Pro Automatic Calibrator provides the accurate velocity
reference, and the ADC provides the accurate angular reference. Pleaserefer to the relevant solution / data-sheets for the individual componentspecifications.

The complete CTA calibration setup. The hotwire probe, CTA and the A/D converter are notincluded.

Technical specifications - Directional calibration
Specifications
Pitch positioning accuracy

0.1 deg (1745 µrad)

Roll positioning accuracy

0.1 deg (1745 µrad)

Resolution

0.0002 deg (3.5 µrad)

Weight0.99 kg

Dimensions

208 mm x 158 mm x 122 mm

Data connection

USB, 4.5m

Emergency stop button

External, red, 0.9m cable

Probe alignment tools

Triple sensor parallel flow probes only

Mains connection

100 - 240 VAC

Page 2The Automatic Directional Calibrator
performs directional calibration ofmulti-wire probes.

Technical specifications - Velocity calibration
SpecificationsVelocity range

0.02 m/s to 120 m/s using 3 nozzles

Accuracy (2σ)±1% ±0.02 m/s (0.05-120 m/s)

Repeatability<±0.2% or ±0.02 m/s

Turbulence intensity<0.3% in entire range, typically <0.2%

Test section

Free jetNozzle diameter & velocity range

42 mm, 0.02 to 0.5 m/s			

12.4 mm, 0.5 to 60 m/s
8.8 mm, 5 to 120 m/s

Air supply

Compressed air at 0.7 to 0.9 MPa

Air consumption

0.2 to 26 m3/h

Operating temperature

0 to 45 º C

Dimensions

13.5 cm (w) x 33 cm (h) x 25 cm (d)Ordering information
Model

Item noStandalone Calibrator Software
Calibration of generic single-, dual- and triple-sensor hotwire / hotfim probes.

91S01

StreamLine Pro Automatic Calibrator
Velocity range: 0.05-120 m/s using 3 nozzles. Traceablecalibration certificate for 2-50 m/s. USB & LAN interface, supports standalone operation. Compatible with
StreamWare v4.10 or newer. Directional calibration
with 90H03 Pitch/Yaw/Roll manipulator. Incl. 90H04 Air
Purifier Unit with 10-meter air hose.

91H01

Option Automatic Directional Calibrator
Motorized directional calibration of multiple- sensor,
parallel-flow hotwire probes. Please quote "91H11 Probealignment kit for cross-flow probes" if the configuration
includes cross- flow probes.

90H10

Option StreamLine Pitch/Yaw/Roll Manipulator Air/Water
Directional calibration of multiple- sensor, parallel-flow
hotwire probes. Please quote "91H11 Probe alignment kitfor cross-flow probes" if the configuration includes crossflow probes.

91H03

Option Probe Alignment kit for cross flow probes
Probe alignment kit for cross flow probes. Suitable forthe calibration of 55R52, 55R62, 55P63, 55R53, 55R63,55P64, 55R54, 55R64 and the triple sensor probe 55R97.

91H11

Solution Sheet 0782_v5. Subject to change without notice. Copyright © 2024
Dantec Dynamics. All Rights Reserved. www.dantecdynamics.com