Cover



Contents

  1. Introduction Page 
    1. The ALTOSTRATUS Probe Page 
  2. Set Up Page 
    1. Install and Connect Page 
    2. Mount the Device Page 
    3. Zero the Probe Page 
  3. Reset & Update Page 
    1. Reset the ALTOSTRATUS Page 
    2. Update the ALTOSTRATUS Page 
  4. Important Safety Information Page 


Introduction


The ALTOSTRATUS Probe


Altostratus power button
Battery State LED Colour Behaviour
Good (≥ 40%) Cyan / Blue Alternating pulse
Medium (20–39%) Cyan / Amber Alternating pulse
Low (< 20%) Cyan / Red Alternating pulse
Critical Red Slow fade
Charging (device on) Amber Solid
Charging (standby) Amber Slow pulse
Fully charged (device on) Green Solid
Fully charged (standby) Green Slow pulse
Startup Green / Cyan Alternating pulse
Power button hold White Fast flash

Set Up


Install & Connect


To use your ALTOSTRATUS sensor with the CIRRUS system:

  1. Turn on the sensor by pressing the power button once. The LED should blink green and blue.

  2. Start the NIMBUS app in the data logger. The NIMBUS app will come pre-installed.
  3. On the start up screen, go to Setup

  4. Nimbus initial screen

  5. Expand the Sensors section.

  6. Nimbus setup screen

  7. Select Connections

  8. Nimbus connections screen

  9. To connect the ALTOSTRATUS, press SL Scan
  10. After devices appear, select AERO_5 and press Connect


    Nimbus SL scan screen

  11. The sensor should now show as TRACKING

  12. Nimbus SL scan screen



Mount the Device


  1. Please mount the ALTOSTRATUS probe to the bike so that the head of the probe is inside of the green zone, as shown in the drawing below.
  2. Altostratus probe mounting position
  3. Ensure that the probe head is parallel to the ground. Aim for +/- 1 degree but a variation of 2-3 degrees will not cause a significant error.

  4. Altostratus mounting angle

  5. Lock the pivot bolt using a 2mm allen key to avoid movement while testing.

  6. Altostratus mounting angle

  7. Use the manual regulator to adjust the angle.

  8. Altostratus regulator

  9. Now tighten the screw on the Go Pro mount.

  10. Altostratus mount screw

  11. Finally, tighten the pivot screw on the opposite side of the probe.

  12. Altostratus mount screw

For assistance with custom mounts please send a message to support@streamlines.aero




Reset & Update


Reset the ALTOSTRATUS

If the ALTOSTRATUS device becomes unresponsive you can manually reset it by inserting a pin into the hole above the charging port and pressing it down for 3 seconds. This reset only cuts off the power and will not erase any stored data.

ALTOSTRATUS reset button

Update the ALTOSTRATUS

Please periodically check if your ALTOSTRATUS sensor is running the latest software version by downloading the Streamlines Firmware Updater App (available at the iOS App Store and Google Play Store) and updating it when appropriate.


Google Play store icon Apple Store icon

How to use the Firmware Updater App:

  1. Ensure Bluetooth is turned on phone
  2. Open the Streamlines Firmware Updater App
  3. Select 'ALTOSTRATUS' on the top tabs
  4. Press 'Load from server' button
  5. Then, press the ALTOSTRATUS device's power button 10+ times; the LED should blink red & green
  6. Next, press 'Start update' button on the app
  7. On the ALTOSTRATUS, the LED will flash blue while updating, then it will flash blue and cyan once the update is complete


Important Safety Information


WARNINGS:




STREAMLINES AERO LTD.

© 2025 Streamlines Aero Ltd. All rights reserved.


The Streamlines logo is a trademarks of Streamlines Aero Ltd.


Streamlines Aero Limited

62 Temple Road, OX4 2HB

Oxford - United Kingdom

www.streamlines.aero


The Bluetooth word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Streamlines is under license.

Other company and product names mentioned herein may be trademarks of their respective companies.

Every effort has been made to ensure that the information in this manual is accurate.