OK. My black globe sensor is complete except for a mount. Here are a few details and photos for anyone wanting to make one or compare my construction to Michaelpt's.
I made mine to use a Davis temperature probe. I used a 14" NPT brass pipe cap, a 14" NPT brass male hose barb, some 1/4" brass hobby tubing, a 4-40 stainless machine screw, and a 1/4-20 brass adjusting nut I found in the junk box.
Like Michaelpt, I drilled out the pipe cap to pass the probe and soldered it to the sphere. In order to hold it in place, I screwed it down with a self-drilling machine screw and a washer:
After it was soldered, I removed the screw and washer and drilled out the sphere through the cap.
I made a holder for the probe out of the hose barb, sawing off the barb and drilling it out to just pass the brass tubing. Then I drilled and tapped a 4-40 set screw hole through one of the hex flats.
The probe assembly is made from the brass tubing and the brass adjusting nut.
Hint: The temperature sensor is supposed to be in the middle of the sphere. I dry fit the Davis sensor through the full length tubing. You'll have to cut off the phone jack on the end of the cable, and either splice it or crimp on a new connector later. Save the original connector so you can get the colors right if you are crimping a new one on. I screwed the holder into the cap, and slid the probe and tube in until it hit the far side of the sphere and marked the tube where it exited the holder fitting. Then, since it's a 6" sphere, half way is 3" up the tube from there. I marked that.
I drilled out the nut (now it's a stop) to pass the tubing, cut the tubing to allow about a half inch beyond the stop and soldered the 2 together at the previously marked "halfway" mark, ensuring that the threads pointed the right way.
I used the tips of a pair of needle nose pliers to debur and slightly flare both ends of the tube. Be careful not to flare the "inside" end so much that it won't pass through the holder. (Don't ask how I know this...)
Then I slid the temperature probe cable through the tube assembly and secured the probe and the exiting cable with 5 minute epoxy.
While that set, I painted the sphere and set it up for testing.
Next, a mount and building a Davis Wet Bulb sensor. I already have a wet bulb cobbled up for calculations. It's a heck of a lot easier than trying to calculate theoretical wet bulb from other data.
