Item on conveyor rail not exchanging heat

Is the mass of the bits of aluminium on the rail less than 1 gram? Because if so, that's by design, mass under 1g doesn't undergo thermal transfer (probably to avoid issues with rounding tiny amounts of heat energy, I'd assume.) Unfortunately, that means that using a conveyor temp sensor can run into this kind of issue.

It's a pain, but generally, just using a shutoff with a timer or measuring the steam temperature to control the release of metal from the steam chamber is more effective.

Edited April 22 by ashridah

I am aware. These are 14.9kg and 20kg packets in about 500kg of water each.