Data Collection Procedure for -70 Freezer (Defrosting)

bobdoering

Stop X-bar/R Madness!!
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#11
The facilities I call on that have -70 (and colder) freezers have monitors and alarms on them. They know exactly what the temperatures are all the time, and they are automatically logged. That is in addition to annual calibrations.
This issue is how do they prove the monitors are accurate (not do they know what the recorder says at all times), and what are their calibration procedures. Those are the issues we are trying to benchmark in this thread.

Is ice buildup an issue at those locations, or is that error (if significant) ignored?
 
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BradM

Staff member
Admin
#12
I think you need to have an expert come and look at the freezers. I bet you paid $10K for that freezer (or near it). There should be no frost buildup. Is it happening around the gasket? if so, then it may not be sealing up tight enough. Maybe (just maybe) some door adjustments can fix the issue.

I'm coming in the middle of this, so sorry if I'm off base. You have an independent RTD in the freezer, monitored somewhere else. You have issues with the freezer, so someone comes in and performs maintenance on the equipment, independent of this probe. I would think the probe is removed from the chamber and set to the side. When complete, they place the probe back into the chamber.

If that is the case, there is no need for calibration. There has been no activity at all that could affect the accuracy of that independent probe.
 
K

KeithM

#13
Just to clerify. The "as found data was taken after the material was removed along with a good percentage of the frost/ice. This in my opinion is not right. "As Found" data should be taken as is. The probe however was still pretty well packed in frost/ice and was within the +/- 1 degree tolerance. Once the unit was defrosted the probe is now reading 3 degrees off since it's now free from the Frost/ice pack. Keep in mind that even though these units are for long term storage they are frequently opened in real lab use and frost/ice is easly removed as it forms. Once it is left to build the unit is no longer cycling as normal because of the lack of air flow. As I see it the data shows that this unit was not tracking properly and an Out of Calibration report would be prudent.
 

bobdoering

Stop X-bar/R Madness!!
Trusted Information Resource
#14
I agree, what you are describing is not what I would call a "calibration" - at least in terms of the sensor (or, to be fair, the controller if it depends on that sensor.) Conditions tested "as found" and "as left" should be identical, with the only difference between the two any adjustment (if required or possible) if you are calibrating the sensor.

If you are "calibrating" the freezer "system" (sensor, controller, and PM), then as found would be as it was found (iced up), and as left would be defrosted (as an "adjustment"), if that is how you left it. If your +/- 1 degree tolerance is for the system, and you find a 3 degree difference, then you need to correct the system (yes, out of calibration) - which (of course) is defrosting more often so that the sensor does not accumulate enough ice to become more than +/- 1 degree off.
 

Big Jim

Super Moderator
#15
This issue is how do they prove the monitors are accurate (not do they know what the recorder says at all times), and what are their calibration procedures. Those are the issues we are trying to benchmark in this thread.

Is ice buildup an issue at those locations, or is that error (if significant) ignored?
The log and how the readings compare to the calibration readings would be useful information, especially the before and after defrost log readings. I'm not claiming that it is a complete answer, but it would provide far more information than they have now.
 
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