How Too Check Accuracy Of Pyro? ?

[Jeff H]

I pulled my Pyro apart and zero'd it out.

But I got to tinkin should have I set it to the outside temp rather than 0 degrees?

I would now like to check to see how accurate it is now. How or what could I use to check the accuracy?

When going down the road at 55 I'm now running at 450 to 500 degrees. Thats with 285/75 tires and 3. 54 gears. truck empty. It seams a bit low to me. At idle sitting in the driveway it reads in the 200 to 250 degrees.

 

[paccool]

Water boils at 212 degrees. Pull the probe and place the tip in a pan of boiling water. You must keep the water boiling to get a good reading. Set the gauge from this. I think you should have set the meter to whatever the ambient temperature was at that the probe was seeing.



Woops, forgot about altitude. See you are in MN. What is the alt there? You might want to place a thermometer in the water to see how close to 212 it is.



Stan

 

[wyosteve]

Not trying to be a smart A--, but water boils at 212 F. no matter what the altitude is. It just takes longer to reach that temp at higher altitude which I believe is due to the fact that the flame is not quite as hot due to less oxygen available. Feel free to correct me since it's been a lot of years since I took chemistry and science classes.

 

[Ethdee]

If I remember correctly, you should have set it to ambient with the thermocouple hooked up or 70 degrees with the leads shorted.



And the higher the altitude, the lower temperature at which water boils, due to the lower air pressure. In Denver, water boils at 203 degrees Fahrenheit.



Jim

 

[JTBMC]

EGT Temps, I was wondering about the same question. I have the Isspro EV gauges and cruises at 750 to 800 degrees at 70 mph unloaded, temps are much higer towing. and feel the gauge is possibly wrong, with my other old style Isspro EGT gauges temps were about 550 to 650 degrees at 70 mph with 8 #'s of boost. At 65 mph boost is 4 to 6 #'s and 700 to 750 degrees. Also it takes forever to drop to 300 degrees prior to shut down, about 2. 5 to 3 minutes, gauge useully stops at 350 in about 1 min then the wait is on to get to 300. The differance in new higher temps is I now have a Edge EZ set on level 3, with DD # 1 injectors.

I am at Sea level also, while in Colorado a couple of weeks ago temps cruising were 900 to 1000 degrees with out a load.

Thanks ,TJ

 

[pnwradar]

Originally posted by wyosteve

Not trying to be a smart A--, but water boils at 212 F. no matter what the altitude is. It just takes longer to reach that temp at higher altitude which I believe is due to the fact that the flame is not quite as hot due to less oxygen available. Feel free to correct me since it's been a lot of years since I took chemistry and science classes.

Quoted from How Stuff Works:



"The reason foods have these instructions is because the boiling point of water changes with altitude. As you go higher, the boiling temperature decreases.



At sea level, the boiling point of water is 212 degrees F (100 degrees C). As a general rule, the temperature decreases by 1 degree F for every 540 feet of altitude (0. 56 degrees C for every 165 meters). On top of Pike's Peak, at 14,000 feet, the boiling point of water is 187 degrees F (86 degrees C). So pasta or potatoes cooked at sea level are seeing 25 degrees more heat than pasta or potatoes cooked on Pike's Peak. The lower heat means a longer cooking time is needed. "



-jon-

 

[Lug-nut]

Originally posted by wyosteve

Not trying to be a smart A--, but water boils at 212 F. no matter what the altitude is. It just takes longer to reach that temp at higher altitude which I believe is due to the fact that the flame is not quite as hot due to less oxygen available. Feel free to correct me since it's been a lot of years since I took chemistry and science classes.

Water ONLY boils at 212 degrees at sea level on a standard pressure day. The boilingtemp of water (or any liquid for that matter is directly dependant on the pressure exerted on the liquid by the atmosphere. This is why the water in your cooling system can reach temps above 212 (because of the pressure cap on the radiator) and also why pressure cookers work so well... . but now I am rambling. So... ... at higher elevations water will boil at a lower temp. I don't recall the numbers vs pressures, but here in Idaho at about 4800 ft. water boils at around 202 or so degrees. That being said, if you set the temp at somewhere near 200-212 with the probe in boiling water, the error should be small enough as to be insignificant.

 

[illflem]

So if you really want to get accurate you will also need an altimeter and a barometer.

 

[Lug-nut]

Originally posted by illflem

So if you really want to get accurate you will also need an altimeter and a barometer.

lol





But just cause I am in a smarta$$ mood today... ... . an altimeter is actually nothing more than a barometer... :--)

 

[JTBMC]

I have a Casio wrist watch with Triple functions Altimiter, Barometer, & Tempreture, and Compass so if I can figure out how to hook my watch up to my truck I'll be able to accuratly boil water on the exhaust manifold and shorten the cook time of my MRE's while camping.

 

[rspinks]

Good one tjlaffite, this site cracks me up.

 

['956Wheel]

If I knew you were coming I'd baked a cake... but I had no idea of the altitude or if you could make it here despite your EGT's. So we will just call for a pizza!



You could ues a templestick on the probe with a propane torch to heat it. This would work to check the higher temps.



Ambient temp is not relevant due to the fact that the probe is in a isolated enviroment. i. e. , it does not matter what ambient temp it is water will always boil at 212 (sea level).



Mike

 

[Ethdee]

Okay, if you REALLY want to check calibration, get a millivolt calibrator and a thermocouple table and figure out the math, or get a thermocouple simulator and crank in the temperatures.



If you're lucky enough to have a process instrumentation shop near you, you can probably stop in and have someone check it for a few bucks. Do you know anyone that works in a process plant, like a brewery, refinery, or the like?



I checked mine before and after installation, and it varies from right on to +/- 25 degrees, depending on where in the scale you look at it. Thermocouples aren't exactly linear devices, but they're close.



Jim

 

[TowPro]

welding supply places sell these things called temple sticks, its like a crayon. YOu mark the end of the probe with it, heat just the end of the probe where you marked it. When the mark changes colors its the temp the temple stick is designed for, have your buddy check the gauge.



I used a 1000 deg stick.



It takes 2 people because the probe will cool off before you can run around and check what the gauge says.



You want to heat the end of the probe, as It was explaned to me, they are actualy telling you the difference between one end of the probe and the other.

 

[Jeff H]

I Basically wan't low couple hundred degrees. Then mid around 500 hundred degrees. Then High if I can around 1200 degrees.

I supose I could use boiling water.

How hot is a candle?

Or propane stove. How hot is the burners?

 

[JBlock]

tjlaffite

tjlaffite

Isopro had a set of pyro that were out of calabration. i think, I like you have a fault clacabration. Mine take for ever to get below 350Fto 300F. I might try the boiling water trick to check the lower calcabration too.



Check this out



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If an adjust skeem for those who know they are reading high.



Joe