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Accurate Freezer Thermometer? #5414405 04/27/20 09:20 AM
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Quattro Pete Offline OP
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Any recommendations for an accurate freezer thermometer? I already ordered this one, but I'm not sure of its accuracy. Typically in such thermometers, accuracy isn't very good at the extreme ends of the scale, but I'm having a hard time finding one that goes much below -20F.

I have an IR thermometer, but I'm not sure how good these things are at measuring freezer temps.

I am trying to monitor the temp of my chest freezer. The other day I put a quart of ice cream in there, and 24 hours later when I took it out, it was very soft - on the verge of turning to liquid.


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Re: Accurate Freezer Thermometer? [Re: Quattro Pete] #5414456 04/27/20 10:00 AM
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Barkleymut Offline
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make sure and don't block the area where the cold air is blown into the freezer. During the early stages of coronageddon I have had to shuffle things around in our fridge since the milk that was right next to the fan/blower/cold air shooter thingy was getting frozen and stuff in the middle shelves was not cold enough.


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Re: Accurate Freezer Thermometer? [Re: Quattro Pete] #5414466 04/27/20 10:06 AM
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Donald Offline
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Your chest freezer should get things like ice cream rock solid. Not sure there is a fan to blow the cold air around in a chest freezer. You can typically pack a chest freezer as full as you want without issue. I only get some frost around the area where the top seal is. If it gets really bad it might not let the top close 100% which would compound the problem.


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Re: Accurate Freezer Thermometer? [Re: Quattro Pete] #5414470 04/27/20 10:09 AM
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Donald Offline
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You should be able to (with IR thermometer) pull off the top few items and aim at an item down a bit to get a reasonable temp. Its probably a few degrees colder than what the IT thermometer says.


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Re: Accurate Freezer Thermometer? [Re: Quattro Pete] #5414477 04/27/20 10:12 AM
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JohnG Offline
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Why do you need -20F? Most foods are frozen at maybe 0 to -2F.

Re: Accurate Freezer Thermometer? [Re: Barkleymut] #5414479 04/27/20 10:16 AM
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Quattro Pete Offline OP
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Originally Posted by Barkleymut
make sure and don't block the area where the cold air is blown into the freezer.

This particular one doesn't have such area. The interior is lined with solid aluminum (I think?).


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Re: Accurate Freezer Thermometer? [Re: Donald] #5414488 04/27/20 10:20 AM
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Quattro Pete Offline OP
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Originally Posted by Donald
You should be able to (with IR thermometer) pull off the top few items and aim at an item down a bit to get a reasonable temp. Its probably a few degrees colder than what the IT thermometer says.
I'm seeing -12F with IR thermometer pointed at items toward the bottom of the freezer. That particular ice cream container was sitting closer to the top. It has since firmed up quite a bit, after I moved the temp dial from the middle more toward the "coldest" setting.


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Re: Accurate Freezer Thermometer? [Re: JohnG] #5414492 04/27/20 10:21 AM
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Quattro Pete Offline OP
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Originally Posted by JohnG
Why do you need -20F? Most foods are frozen at maybe 0 to -2F.

I don't need -20F. I just wanted the scale of the thermometer to go below -20F so that the readout of actual temperature wouldn't be so close to the end of the scale, for the reason I mentioned earlier.



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Re: Accurate Freezer Thermometer? [Re: Quattro Pete] #5414514 04/27/20 10:56 AM
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Donald Offline
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Nothing happens very fast in a chest freezer. Take reading in morning after a night of it running and not being opened.

Last edited by Donald; 04/27/20 10:56 AM.

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Re: Accurate Freezer Thermometer? [Re: Donald] #5414520 04/27/20 11:03 AM
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Quattro Pete Offline OP
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Originally Posted by Donald
Nothing happens very fast in a chest freezer. Take reading in morning after a night of it running and not being opened.

Yes, i adjusted the temp yesterday, and measured the temp today.


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Re: Accurate Freezer Thermometer? [Re: Quattro Pete] #5414561 04/27/20 11:42 AM
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mk378 Offline
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Check the door seal. It needs to seal all the way around. Usual advice is to close the lid on a dollar bill and make sure the bill is held in place. Repeat the test in several places.

Chest freezers are cooled by coils embedded in the interior walls from the top to about 6 inches down. The cold air then naturally falls toward the bottom.

+1 on nothing happens fast. If the ice cream wasn't well frozen when you put it in, and especially if it was near the top, it will take a long time to freeze.

Re: Accurate Freezer Thermometer? [Re: mk378] #5414572 04/27/20 11:49 AM
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Quattro Pete Offline OP
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Originally Posted by mk378
If the ice cream wasn't well frozen when you put it in, and especially if it was near the top, it will take a long time to freeze.

Actually, it felt fairly hard when brought in from the store and put in the freezer. Then 24 hours later, it was mush.

I suspect wife may have not closed the lid properly, but we'll never know at this point. I just want to make sure the freezer isn't broken, and if it is, get it fixed while it's still under warranty.


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Re: Accurate Freezer Thermometer? [Re: mk378] #5414586 04/27/20 12:08 PM
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Quattro Pete Offline OP
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Originally Posted by mk378
Check the door seal. It needs to seal all the way around. Usual advice is to close the lid on a dollar bill and make sure the bill is held in place. Repeat the test in several places.

Can you elaborate on what "held in place" exactly means? If I put a bill and close the lid, I can fairly easily pull it out without a whole lot of resistance, pretty much anywhere around the perimeter of the seal.

There is one slight indentation on the seal - see pics below, which was there since the beginning - not sure if this is something to be concerned about? Should I demand it be replaced?

[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]


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Re: Accurate Freezer Thermometer? [Re: Quattro Pete] #5414594 04/27/20 12:14 PM
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Another factor in chest type freezers is the fullness factor. Packed freezers are slower to chill, since more (most) of the cooling in a full freezers is by conduction rather than air circulation, Also, anything at or above the level of the cooling coil just doesn't freeze as hard. My mother will not stop buying food until the lid won't close on the last pizza.she tries to put in there and everything on the top layer of her freezer is merely crunchy frozen.

For a freezer thermometer I use one of the indoor/outdoor thermometers from the garden center at Lowes that has a wired outdoor sensor. Cheap, accurate, and the wire is flat so it can be taped down for minimal disruption of the gasket seal.

There are so many factors involved in IR thermometer accuracy that you can think of them as in the ball park readings rather than a precise number.

Re: Accurate Freezer Thermometer? [Re: Quattro Pete] #5414597 04/27/20 12:23 PM
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MasterSolenoid Offline
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For my Frig (not freezer) I have two Digital Thermometers sitting side-by-side.
For the Freezer, I have one Dial Type (same as what Quattro ordered).

New Freezer - Read the Owners Manual and see what pointers you pick up.

IR Thermometer - Read the Owners Manual and see what the accuracy and range is.

Although it seems you may have already corrected the temp by turning the Control higher.

Lou Boyle has a good suggestion with using an Indoor/Outdoor Thermometer with the Sensor inside and the Thermometer mounted on exterior.
I guess that's the way it's done. It's got me thinking.

What about a 'Wireless' Outdoor Thermometer.
Sensor inside freezer / Readout on wall near Freezer.
https://www.lowes.com/pd/AcuRite-Di...CO7uiuSRiekCFbEDiAkdMtMOQg&gclsrc=ds


Last edited by MasterSolenoid; 04/27/20 12:39 PM.

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