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www.scaledinstruments.com
507 NW 60th Street Suite D Gainesville, FL, 32607 USA
Phone: (352) 262-6119
Email: ryanwilhour@gmail.com
24-Hour Conversion Kit for the Davis Instruments 7747
Daytime Fan-Aspirated Radiation Shield
Table of Contents
Introduction .................................................................................................................................................. 1
Acknowledgements ....................................................................................................................................... 2
Components .................................................................................................................................................. 2
Parts List ........................................................................................................................................................ 2
Tools Needed: ............................................................................................................................................... 2
Performing the Conversion ........................................................................................................................... 3
Installation Overview ................................................................................................................................ 3
Remove & Disassemble the existing DFARS ............................................................................................. 3
Move Spacers ............................................................................................................................................ 9
Install Battery Terminals into appropriate slots ..................................................................................... 11
Place the PCBA into the DFARS and Solder battery connectors ............................................................. 13
Reassemble the radiation shield ............................................................................................................. 15
Reinstall the radiation shield to the ISS .................................................................................................. 19
Introduction
Thank you for your purchase of the 24-hour conversion kit used to convert a Davis 7747
Daytime Fan-Aspirated Radiation Shield (DFARS) into a 24-hour unit. This conversion kit is
designed to bring your DFARS as close as possible to the official 24-hour shield used on the
Davis Vantage Pro2 Models 6153 & 6163. The kit utilizes the same parts used in these models
to provide both solar and battery power to your DFARS. This guide assumes you have already
purchased and installed the Davis 7747 unit. Scaled Instruments is not responsible for any
© 2014 Scaled Instruments - Reproduction prohibited unless permission explicitly granted
www.scaledinstruments.com
1
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Table of Contents
Related Manuals for Scaled Instruments Davis 7747
Summary of Contents for Scaled Instruments Davis 7747
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Page 1: Table Of Contents
Reinstall the radiation shield to the ISS ....................19 Introduction Thank you for your purchase of the 24-hour conversion kit used to convert a Davis 7747 Daytime Fan-Aspirated Radiation Shield (DFARS) into a 24-hour unit. This conversion kit is designed to bring your DFARS as close as possible to the official 24-hour shield used on the Davis Vantage Pro2 Models 6153 &... -
Page 2: Acknowledgements
Additionally, Scaled Instruments is not responsible for any damage or injury you may cause by installing this kit. A portion of this installation requires the ability to solder leads to a printed circuit board assembly (PCBA). -
Page 3: Performing The Conversion
This should be the cover that was used with your DFARS and has two solar panels on it. 2. Disconnect the Solar Panel wire on the SIM cover from the SIM board by pulling the Solar Panel connector. (Fig. 1) © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com... - Page 4 Solar Panel wire on the SIM cover from the power lead connected to the DFARS fan. Set the SIM cover aside in a safe place. (Fig. 2) Figure 2 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com...
- Page 5 5. Disconnect the existing cables from sensor connectors. These cables should all be labeled – if your labels have fallen off, take note of which cables plug in where. (Fig. 4) Figure 4 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com...
- Page 6 6. For wired models, disconnect the console cable from the SIM. (Fig. 5) Figure 5 Feed the TEMP/HUM cable and the fan power cable through the back of the cable access port. (Fig. 6) Figure 6 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com...
- Page 7 ISS base. IMPORTANT: Be sure to support the bottom of the shield while removing the hardware. Save this hardware – it will be used later. (Fig. 8) Figure 8 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com...
- Page 8 11. Remove the closed cap plate and the open cap plate from the DFARS assembly. They should just lift off. You should now be presented with the Fan Plate. (Fig. 9) Figure 9 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com...
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Page 9: Move Spacers
(Fig. 11) Keep the spacers in a safe place, they will be needed later in Section E. Only remove the existing spacers -- the screws, lock washers and flat © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com... - Page 10 <- Keep these spacers for later. Figure 11 Figure 12 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com...
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Page 11: Install Battery Terminals Into Appropriate Slots
Route the pair of red wires through the left hole, and the pair of black wires through the © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com... - Page 12 Figure 14 3. Using a wire stripper, strip appx 1/16” additional insulation from each of the leads. Twist both red leads together, and twist both black leads together. © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com...
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Page 13: Place The Pcba Into The Dfars And Solder Battery Connectors
Fig. 15. Push any excess wire through the two holes and make sure the wires do not interfere with the lip of where the fan will be placed. Figure 15 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com... - Page 14 3. Turn the fan plate over and use zip ties to tie up any excess wire between battery bays (Fig. 16) Figure 16 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com...
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Page 15: Reassemble The Radiation Shield
Section B, Step 1 so that it holds the wire for the TEMP/HUM sensor. Do not screw the strain relief down at this point, as the solar panel wire will also be included. (Fig. 18) © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com... - Page 16 #4 flast washer and self-tapping screw. Attach the PCBA cover by squeezing it and inserting it into the slots on each side of the PCBA. (Fig. 19) © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com...
- Page 17 3. Place the open-end plate on top of the spacers. It may require some extra effort to ensure the plate is seated at the top of the spacers. (Fig. 20) Figure 20 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com...
- Page 18 6. With the solar panel in position, place a #8 flat washer and a #8 lock-washer on top of each threaded rod. Use the hex-shaped threaded spacers from included with your kit © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com...
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Page 19: Reinstall The Radiation Shield To The Iss
3-1/4” screws from in that same step. (Fig. 22) Figure 222 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com... - Page 20 9. Take the console out of Setup Mode and ensure that communication is restored. 10. Use tie-wraps to secure any loose wires after your installation is complete. © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com...
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