Using the EGT Pyrometer Gauge's Temperature Offset Feature
to Counteract Measurement Shifts due to Sensor Aging
Customer Question:
A couple years ago i purchased a gauge and thermocouple from you and I am starting to wonder about accuracy. Now I must say that since the initial install the gauge never read the outside ambient temperature correctly. The thermometer on my porch would read 45F and the gauge would read 55F or so. I have the probe mounted in the exhaust manifold between two cylinders and I assume a completely cold engine that has been sitting outside all night should read closer to ambient than 10+ degrees. Is there any way to test the thermocouple? There appears to be no physical damage.
Answer:
This customer's system is coming up on about 3 years of age. After use EGT probes will sometimes experience what’s called aging. Aging causes the measurement to shift a bit, 10 degrees is not unheard of. The good news is that this does not mean the probe is going bad. This shift can be taken out in the gauge via the offset function. We’d suggest going into the gauge’s program and adding a -10 offset. Here’s a couple of short videos demonstrating how to program in the offset.
A couple years ago i purchased a gauge and thermocouple from you and I am starting to wonder about accuracy. Now I must say that since the initial install the gauge never read the outside ambient temperature correctly. The thermometer on my porch would read 45F and the gauge would read 55F or so. I have the probe mounted in the exhaust manifold between two cylinders and I assume a completely cold engine that has been sitting outside all night should read closer to ambient than 10+ degrees. Is there any way to test the thermocouple? There appears to be no physical damage.
Answer:
This customer's system is coming up on about 3 years of age. After use EGT probes will sometimes experience what’s called aging. Aging causes the measurement to shift a bit, 10 degrees is not unheard of. The good news is that this does not mean the probe is going bad. This shift can be taken out in the gauge via the offset function. We’d suggest going into the gauge’s program and adding a -10 offset. Here’s a couple of short videos demonstrating how to program in the offset.
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