Can you explain this seemingly wrong PT relation?

[MGuy]

I got this unused one step 28 oz can of r410a from

http://marielusa.homestead.com/refrigerants.html

I measure the can's pressure: 258 psig
I measure the can temperature: 77 F (room temperature)

R410a PT chart says 258 psig = 86 F
Or 77F = 226 psi

What's going on?

[dunkman]

Either your measurements are inaccurate or it's not pure refrigerant.

[itsiceman]

MGuy Do you have the mini vacuum pump and scale too?
I saw those a few years back and was interested if the vacuum pump was any good.

[Six]

Strap a thermocouple to the side of the can and insulate it uf you want an accurate measuremwnt.

[beenthere]

Adjusting charge on your YZF yourself. Can cause your contractor to void your warranty with him.

[itsiceman]

Adjusting charge on your YZF yourself. Can cause your contractor to void your warranty with him.

Oh boy :whistle:

Never mind MGuy

[MGuy]

I' ll investigate further to see if it's an error in measurements or not pure refrigerant.

Thanks for your time.