I honestly think putting a thermometer inside the unit is an excellent idea. I sent the following note off to Harvest Right Support in an effort to gain a little better understanding of the process.
I will place a piece of parchment over the baking sheet and add another layer of fruit. After it is frozen solid, the fruit can be taken off the tray and placed in freezer bags if needed.
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I have one of those hand held heat guns (inexpensive from HF), but I was afraid of accidently burning the insulation. My gun gets very hot! I do the same technique with a fan, shock the ice and listen for the cracks as it separates from the chamber wall.
Unlike canning or dehydrating, freeze drying retains 97 percent of the food’s nutrients. Freeze dried food also tastes more like fresh food than canned or dehydrated foods.
Freeze drying is a dehydration process that removes moisture from food while preserving its structure and nutritional value by freezing it first and then creating a vacuum around it.
14 Posted December 16, 2015 On 7/31/2015 at 11:12 PM, TonyC said: Here is my first pass on a Vapor Trap... it is an old whole house water filter that I modified. It failed to reduce the moisture in the oil... I'm in the process of modifying it to catch and suspend the moisture in the container long enough for desiccant beads to absorb the water. The air flow comes into the inlet, down the central pipe to the bottom of the screen and filters up through the beads and out the top. I know this was like forever ago, but I thought I would respond anyway. I haven't been on much in a while, I only run my freeze dryer in the winter. So I think you'll find it's a lot harder to remove water vapor from a vacuum than just using desiccant, as the vacuum will just pull the water out of the desiccant.
After buying our freeze dryer I was naturally curious as to how it "knew" when something was done, since batch times varied so much depending on what was being processed. Watching the cycle times didn't seem to tell me anything at first -- especially without a thermometer to tell me what was happening inside -- until I finally caught on that applying heat to the frozen food affected the vacuum, which provided the measure of how dry the food had become.
Tray lids– Though freeze drying is underway, you would possibly end up prepping for the next batch. Tray lids are vital in these conditions, preserving your prepped food from contaminants, odors, or unintended spills with your freezer.
I love that the small freeze dryer can be placed on a kitchen counter. Having it in the kitchen makes it convenient and always ready to start the freeze-drying process.
Freeze dried salsa One of our favorite things to freeze dried is our homemade salsa. It tastes much more like fresh than it does when canned. It reconstitutes very quickly and is delicious to eat as a dip or added to spaghetti sauce. We also like to sprinkle it on popcorn.
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Monitoring the FDer internal temps and once I see -40F I start the dry cycle, except for high sugar content food which I give an extra hour. I'm still experimenting with Ice cream and a few fruits to determine optimal freeze time to get the best results. The cooling cycle ends up much shorter.
The food options we had there were extremely limited and full of preservatives. To counter that, my buddy Lance went in with family members on the purchase of a freeze dryer for home use.