Try the following on your diagram: double-click the "Read from spreadsheed file.vi" and look at its diagram.
-- In the center, you see a SGL array named "type(empty)". right-click on it and select "representation..EXT". -- Repeat with the two terminals on the right (all rows, first row). Now save the VI in your own folder with a new name (e.g. "Read EXT from Spreadsheet file.vi"), you also might want to change the icon, e.g. just fill the background with a different color. See if this helps. Of course with real data you should never use "search array" with floating point numbers. The chance of getting a hit is near zero. Alternatively, you might try to find the array element that is closest to your test number (e.g. subtract it from the array, take the absolute value, then find the minimum using "array Min Max".
