Have the MES 30 1st Gen and I have used the AMNPS with great success by pulling the chip tray out just enough that I can see the bottom of tray, wide open with top vent and pull the chip loader out about 2 " or so.
Did a small turkey that I smoked for 6 hours, turned off the MES, but forgot to take the AMNPS out. 2 hours later, after dinner, I noticed the smoke was still coming out of the top vent. The smell was so good coming out of the vent that I left it in there while we sat on the deck for 2 more hours!
My new aromatherapy!
BTW, when I did a brisket, I used the water pan filled with sand and gravel, covered it with foil, and put it in the slot made for it under bottom rack.
For some reason, the AMNPS didn't perform as well? After a half hour, I took the water pan out and the AMNPS worked like a charm?
Anyone have the same issue? I assume it was an airflow problem caused by the placement of the water pan?
Luckily, the temp held just fine without a heat sink since I only opened the door twice during the whole 10 hour smoke. Once to foil it and once because, well, you know, I just had to!
When I set MES to 200-210, the Maverick 732 reading only varies about 10 degrees from what MES shows for chamber temp.
However, when I crank it up to 220 or above, the Maverick reading varies as much as 50 degrees?
Had it at 275 (max) for some wings and the Maverick was reading 331!
And this was one a cool day <75 degrees.