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