More probe logging data

[Steve_M]

Just got my Maverick ET-72 pit probe and ET-72 meat probe. I also purchased a high-heat probe, but will have to run another heat up, cool down test to see what it's like as well.

In this test, I'm using the following probes.

Probe0 = ET-72 Pit
Probe1 = ET-72 Meat
Probe2 = iGrill Pit
Probe3 = iGrill Meat

I've also taken individual readings of the 10k resistors on the HM board and am using those values. They're 9955, 9937, 9938 and 9958 for probe0 through probe3, respectively.

I used my handy-dandy egg carton holder on my Weber gas grill. The egg carton was placed on the left side of the warming rack and I used the far right burner as the heat source, ramping up the heat by about 1/4 turn of the knob every 10-15 minutes.

Observations:

1) The Maverick and iGrill probes pretty much tracked bang on.

2) The Maverick meat probe was tracking between 8-10 degrees hotter than the Maverick pit probe

2) The iGrill meat probe was tracking between 10-20 degreees cooler than the Maverick meat probe

4) When I turned off the heat source, the Maverick meat probe, Maverick pit probe and iGrill pit probe were pretty much reading the same temp within 1 degrees.

I'm really curious as to why the Maverick meat probe was tracking hotter than the 2 pit probes when the heat source was active, but then started reading the same as the 2 pit probes on cool down.

HM Graph:

Google Docs Graph using the CSV output from the HM ie: /luci/lm/hist?nancnt=460

I excluded the target temp data from the google graph to allow the probe temperature range to be better seen.

Link to full size static image: http://i.imgur.com/ZtcZS9n.png

The following link will bring you to a much larger, interactive version of the above Google Docs graph.

http://dl.dropboxusercontent.com/u/833508/Maverick_iGrill.html

 

[John Case]

That's interesting!

 

[Bryan Mayland]

That is interesting. I wonder if has something to do with the response time of the probes. I have no idea really.

 

[Steve_M]

I ran another heat / cool cycle last with the following info.

Probe0 = ET-72 Pit
Probe1 = ET-72 Meat1
Probe2 = ET-72 Meat2 ( High heat probe )
Probe3 = iGrill Meat2

In trying to figure out the temp difference between heat and cool, I modified my egg carton holder, removing as much material as possible, so that it could support the temp probes but not trap any air under them or conduct any heat of its own.

This run shows the 3 Maverick probes running pretty close together and the iGrill probe running a little cool.

Interestingly enough the ET-72 Meat1 from the last run isn't running hot compared to the pit probe. The 2 Maverick meat probes tracked almost identical paths with the Maverick pit probe running 2-3 degrees hotter.

Full res of the HM graph: http://i.imgur.com/iUreqIZ.png

Full res of the Google Docs graph: http://i.imgur.com/SjaVmo7.png

Large, interactive Google Docs graph:
http://dl.dropboxusercontent.com/u/833508/Maverick_iGrill2.html