All the work of probe manufacture is based on the work of C. C. Wafer at al. (UNC, Raleigh, NC,USA) and modified/enhanced to achieve the goal of our studies. A big thanks to Steven Earp (student shop manager), Matthew Wiesner, Connor Coleman, Jonathan Bills without whom this work would not have been possible.
Equipment with the machines and help of the Pratt Student Shop
Lathe (the rod turns and the drill is fixed)
Bandsaw to cut the brass rods (hose clamp tigten before cutting)
1 Micro Drill Chuck part # 01136498
Heat gun (harbor freight or other)
+ pliers, files, etc...
Platinum wire from Johnson Matthey Precious Metals Division : Platinum(99.95%) Wire 0.0394 inch diameter +/- .0004
From Mc master Carr
|7972A209||Welding and Brazing Rod Gas, Low-Fuming Bronze, 1/8" Dia, 5-lb Pk, Packs of 5 Lb. (Same as 7972A163)|
|7861K53||Moisture-Seal Polyolefin Heat-Shrink Tubing 1/4" ID Before, 5/64" ID After, 48" L, Black, Each of 48 In.|
|7861K52||Moisture-Seal Polyolefin Heat-Shrink Tubing 3/16" ID Before, 1/16" ID After, 48" L, Black, Each of 48 In.|
|7587K411||Stranded Sing le-Conductor Wire UL 1015, 18 Awg, 600 VAC, Blue (Same as 7587K41)||
|72675K51||Moisture-Seal Polyolefin Heat-Shrink Tubing 0.183" ID Before, .060" ID After, .75" L, Red, Packs of 100|
HCl 4N just on the platinum tip with a rubber band.
Soak overnight (to check any leaks through the heatshrink) and test in water + little ORP solution
Illustrated step by step fabrication method:
Brazing Rod Drilling
Drilling no more than 6mm deep
~ soldering the platinum ~ Pictures TBA
First layer of heat shrink
Third layer and the probe is done
Installation in the field