EGT Thermocouple Probe
| The Exhaust Gas Temperature probe that came with the Solar turbine is a type K (chromel, alumel) thermocouple and it works just fine on the test panel next to your engine. Don't use it on the helicopter though, or if you do, don't extend thermocouple wire all the way to your instrument panel like I originally did. The Westach/Westberg EGT gauge is calibrated for a type K thermocouple probe with 48" chromel/alumel lead wires. If you are using the Westberg gauge, buy their 712-4DKE probe (or similar) and extend the 48" thermocouple lead wires with standard 2-conductor aircraft wire to the gauge in your instrument console. | |
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This is the Solar EGT probe that came with the turbine. (Note: You can click on these pictures to view in higher resolution.) |
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The Solar EGT probe and collar nut, removed from the turbine. The Westberg 712-4DKE EGT probe beneath is about 3" long, with a 1/4" tube x NPT Swagelok tubing connector. |
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Cut the Solar probe so you can reuse the collar nut. |
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I crimped the Swagelok ferrule about 1/3 of the way down on the Wesberg probe, then removed the Swagelok fitting, cut off the NPT threads and machined the nut on the fitting into a stepped flange similar to the flange on the Solar probe. |
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Ream out the collar nut for the stepped flange, then assemble the collar nut and Swagelok fitting on the thermocouple. |
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Here is the new EGT probe installed in the turbine. |
Last Updated: April 19, 2014
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