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Long rebound time after flush with Isomac Tea. - Page 2

Postby jonny2 on Thu Jan 27, 2011 5:53 pm

I see that the Fluke 51 II temperature reader has a "type" setting, that has for different settings, K and T was two of them and and also J and E-thermocouples types.

How would the reading of a Scace device be affected by having the type set to K instead of T?
I have a Scace2 device at home now, made some measurements tonight but noticed the instructions for the scace says that "you must configure your temperature reading device to type t to get correct readings" but it doesnt say anything about how wrong it would read if set to K instead of T-thermocouples type.

I got some readings tonight but the fluke was set to type k, and the temperature readings was surprisingly high but not obviously wrong. I used a long flush, waited for Erics adapter to climb back up to 192F before starting the shot and the temperature at 25 seconds was around 203.5F. I had thought it would be somewhere close to 200F but I suspected that the temperature could be higher because my shots has tasted to bitter and sharp.

I will try changing the type on the Fluke to type T tomorrow and see if the readings change.
jonny2
 
Posts: 17
Joined: Nov 18, 2010
Location: Oslo

Postby jonny2 on Thu Jan 27, 2011 6:03 pm

mkay.. think I found the answer to my own question on this forum, Reading T thermocouple with a K meter

seems like reading from a scace2 with the fluke set to expect a type k would produce 5-7F wrong offset. Seems like I have to do all my readings again tomorrow. well well.
jonny2
 
Posts: 17
Joined: Nov 18, 2010
Location: Oslo

Postby jonny2 on Wed Feb 02, 2011 11:18 am

Image
The flush-n-go was timed with the portafilter in the grouphead with 4 min between the shots.
After the 4 min the grouphead temperature was still below the target temperature but when flushing the temperature spiked and I started the shot when the target temperature was hit on the way down.

Image
The flush-n-wait was timed with the portafilter in the grouphead, ran a shot for 30 seconds, removed portafilter and flushed 20-25 seconds and waited for the target temperature. Usually it took around 3 min between the shots, which is about as long as I usually have when making espresso.

The graphs is a selection of representative shots that I ran, measured, analyzed and plotted in excel. In totalt maybe I plotted around 60 shots in different flush temperatures and technique. The grouphead temperature was read by erics adapter.
jonny2
 
Posts: 17
Joined: Nov 18, 2010
Location: Oslo

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