Homebrew PCBs

Ancel,

In the Harbor Freight laminator, the rollers are almost completely 
surrounded by an aluminum structure that contains the heaters, and 
radiates the heat to the rollers. I have two non contact IR 
thermometers, one with a 1:8 ratio, and one with a 1:1 ratio. even the 
1:1 unit has too wide a field to read the roller temperature through the 
narrow slots on the structure. My contact method shows that the 
structure is about 20�C hotter than the rollers. So, while the non 
contact method rules, it is not a general solution.

Harvey
On 12/30/2016 7:02 AM, AncelB mosaicmerc@... [Homebrew_PCBs] wrote:
>
> Non contact passive infrared rules...
> Get one of these...
> https://www.sparkfun.com/products/9570
>
>