Bubblehead
Well Known Member
This might better go into the Glass Panel area - I'll let the moderators decide.
Since installing SkyView late last year I have had an intermitten indication on oil temp. The probe was still a GRT two-wire model from when I had an EIS-4000 in the plane. After reading up on things on this and the Dynon forums the most common diagnosis was "Bad Ground" so I rewired the ground with no improvement. I decided to change to the Dynon one-wire probe that came with the probe kit so yesterday prepared the water and stove and thermometer to check the calibration on the probe. TERRIBLE! 10 to 15 degrees off all the way up to boiling and back again, and yes I did change the sensor map to the Dynon 5/8" probe.
So I grabbed the original Lyc probe from when I had a Vans analog gage and tried it, again changing the sensor map to 1/8" probe, with the same results. I even tried both probes with the other sensor map settings with no improvement. Did both sensors again with different ground positions, and checked the continuity of the ground. The resistance is about .3 ohms which is supposedly a lot for this type of probe.
The last test of the day was with a new GRT two-wire sensor I had in the spares box. This sensor tracked beautifully right up to 150F and then failed! I turned off the stove and it started working again when the water bath temp dropped below 150. Turned the stove on - failed again.
I am not sure what to do now. The Dynon probe was inaccurate as heck and the GRT probes fail. The one thought I have is to create a custom sensor setup for the Dynon probe to compensate for the inaccuracy, essentially creating a temperature offset. Seems like a band-aid over a free-flowing wound though. Maybe the better way is to just adjust up the alarm setpoints and operating ranges on SkyView by 10 degrees and don't worry about it. That just does not seem right either. I really want to know the oil temp and have confidence it is accurate within a few degrees throughout the normal band.
Any suggestions?
Since installing SkyView late last year I have had an intermitten indication on oil temp. The probe was still a GRT two-wire model from when I had an EIS-4000 in the plane. After reading up on things on this and the Dynon forums the most common diagnosis was "Bad Ground" so I rewired the ground with no improvement. I decided to change to the Dynon one-wire probe that came with the probe kit so yesterday prepared the water and stove and thermometer to check the calibration on the probe. TERRIBLE! 10 to 15 degrees off all the way up to boiling and back again, and yes I did change the sensor map to the Dynon 5/8" probe.
So I grabbed the original Lyc probe from when I had a Vans analog gage and tried it, again changing the sensor map to 1/8" probe, with the same results. I even tried both probes with the other sensor map settings with no improvement. Did both sensors again with different ground positions, and checked the continuity of the ground. The resistance is about .3 ohms which is supposedly a lot for this type of probe.
The last test of the day was with a new GRT two-wire sensor I had in the spares box. This sensor tracked beautifully right up to 150F and then failed! I turned off the stove and it started working again when the water bath temp dropped below 150. Turned the stove on - failed again.
I am not sure what to do now. The Dynon probe was inaccurate as heck and the GRT probes fail. The one thought I have is to create a custom sensor setup for the Dynon probe to compensate for the inaccuracy, essentially creating a temperature offset. Seems like a band-aid over a free-flowing wound though. Maybe the better way is to just adjust up the alarm setpoints and operating ranges on SkyView by 10 degrees and don't worry about it. That just does not seem right either. I really want to know the oil temp and have confidence it is accurate within a few degrees throughout the normal band.
Any suggestions?