Scaled Instruments Davis 7747 Bedienungsanleitung

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

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change in warranty status of your equipment due to the installation of this conversion kit.

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). If you are not confident in your ability to perform this step, it is strongly

suggested you contact a friend with the proper equipment and experience to create a good

solder joint.

Acknowledgements

Scaled instruments would like to thank a generous customer who wishes to remain anonymous

for this outstanding guide.

Components

Before starting, please ensure you have all the necessary components for the conversion. This

conversion relies on re-using parts that are already included with your DFARS, so be sure you

don’t throw anything out until the conversion is complete. You should have the following

components shown on the next page:

Parts List

Quantity Description

(2) 7011.010 24 Hr Spars ISS NiCad Rechargeable Batteries

(2) 7342.509 Pro2 Spars 24 Hr NiCad Battery Cover

(2) 7354.003 Pro2 Spars 24 Hr NiCad Battery Cover O-Ring

(3) 7350.787 PRO2 Standoff M/F #8-32 1.5” Hex 2.25”

(3) 7350.015 PRO2 Stainless Steel 24Hr Shield Spacer

(3) #8-32 x 1.25” Stainless Steel Machine Screws

(3) #8 Stainless Steel Lock Washers

(3) #8 Stainless Steel Flat Washers

(1) 7353.2034 Pro2 SPARS Red and Black Battery Lead Wire Set

(1) 7315.053A Pro2 24hr SPARS PCBA Circuit

(1) 7342.514 Pro2 PCBA Cover

(1) 7345.119 Pro2 24hr SPARS Solar Panel

(6) #4-3/8” Stainless Steel Self Tapping Screws

Tools Needed:

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•A medium Phillips Head screwdriver

•A good soldering iron (Capable of reaching 800 deg F) and StayBrite or equivalent

SILVER solder (Do not use Lead-Tin solder due to exposure to elements) – Rosin core

preferred, or non-corrosive flux

•Wire stripper

Performing the Conversion

Installation Overview

1. For Consoles – Put the console into Setup Mode to prevent erroneous data while

working on the ISS. To put the Vantage Pro2 console into Setup Mode, press and hold

DONE and then press the down arrow (-). This prevents the reception of erroneous data

while you are removing the DFARS from the ISS.

2. Remove the existing DFARS from the ISS

3. Disassemble the existing DFARS to perform the conversion

4. Install the new components into your DFARS

5. Solder battery wires to the PCBA

6. Reassemble the converted DFARS

7. Test the functionality of the fan with both battery and solar operation

8. Reinstall the radiation shield

9. Take the console out of Setup Mode

Remove & Disassemble the existing DFARS

It is important that you work on the conversion in a safe location, such as a workbench. To

do so, please perform the following steps after ensuring your console is in Setup Mode:

1. Locate the Sensor Interface Module (SIM) housing cover on the side of the ISS and

open it. 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)

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Figure 1

3. Disconnect the 2nd 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

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4. Remove the foam insert from the cable access port and set it aside. (Fig. 3)

Figure 3

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

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6. For wired models, disconnect the console cable from the SIM. (Fig. 5)

Figure 5

7. Feed the TEMP/HUM cable and the fan power cable through the back of the cable access port. (Fig. 6)

Figure 6

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8. Remove the rain collector cone by rotating the cone counter-clockwise until the cone’s

latches line up with the openings in the base. Lift off the rain collector cone and set aside

in a safe place. (Fig. 7)

Figure 7

9. While supporting the bottom of the DFARS, remove the (3) #8-32 x 3-1/4” screws, lock

washers and flat washers from the 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

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10. The DFARS should now be free of the ISS. Be careful – there is nothing holding the

closed cap plate and open cap plate at the top of the shield at this point. Take the

DFARS to your work area to perform the conversion.

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

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Move Spacers

1. Remove the screw that holds the strain relief for the fan power cable and

temperature/humidity sensor. Remove the fan power cable from the strain relief and

disconnect from the fan. This cable will no longer be needed. Additionally, remove the

(3) 4” screws from the fan plate as indicated below. Save the 4” screws, washers, and

lock washers from this step, as well as the strain relief and its washer/screw. (Fig. 10).

Figure 10

2. Remove the fan from the housing by simply lifting it..

3. Lift the fan plate off of the existing plate stack, and place the remaining shield to the

side, being sure to keep them in the proper order.

4. Remove the existing spacers in the DFARS fan plate by removing the screw, lock

washer and flat washer from the bottom of the fan plate. These screws are located

under the fan plate (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

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washers will be used in the next step.

<- Keep these spacers for later.

Figure 11

Figure 12

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