ISO 9001 Surveillance Audit Nonconformance - Thermometers not Calibrated

C

Chance

#91
Ah... didn't know you have 13 of these. That makes the economics different.

Whatever accuracy you feel you need the instruments in the freezer rooms, then you want a standard that is sufficiently more accurate than those. So in general, if you are going to have them at +/-°F, then your standard needs to be 1°F; and, it should be reliable and repeatable.

So I would invest a couple of hundred in a decent instrument. Set it for one year interval. Since these are freezers, I would get an extension long enough for the probe, where the meter sat outside the chamber. I would perform a once a month verification on the rooms/thermometers, and log on a sheet you keep by the rooms.
Brad, I found one thermometer for 50 dollars. According to the manufacturer, it is portable I can carry it from room to room with +/- 1 degree C accuracy, more accurate than my internal procedure (+/- 3 degrees C). It also comes with a certificate traceable to NIST.
According to the manufacturer, usually this is the kind used by others who do stuff like we do.
The good thing about this is that, the acclaimation time is within seconds. That means if I bring it in one room it detects/stablilize and will give the accurate reading within seconds.
 
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C

Chance

#92
If my internal procedure accuracy is +/-3 degrees C, should I get a new and calibrated thermometer with 1 degree or 0.5 degree accuracy? According to Brad, I should get a 1 degree accuracy. Why would I get a 1 degree accuracy and not 0.5 degree. Thanks.
 

BradM

Staff member
Admin
#93
Brad, I found one thermometer for 50 dollars. According to the manufacturer, it is portable I can carry it from room to room with +/- 1 degree C accuracy, more accurate than my internal procedure (+/- 3 degrees C). It also comes with a certificate traceable to NIST.
According to the manufacturer, usually this is the kind used by others who do stuff like we do.
The good thing about this is that, the acclaimation time is within seconds. That means if I bring it in one room it detects/stablilize and will give the accurate reading within seconds.
How much will that unit cost you for re-certification? That needs to figure into the equation. :)

If my internal procedure accuracy is +/-3 degrees C, should I get a new and calibrated thermometer with 1 degree or 0.5 degree accuracy? According to Brad, I should get a 1 degree accuracy. Why would I get a 1 degree accuracy and not 0.5 degree. Thanks.
If your instrument accuracy is 3 degrees, then you should get a thermometer with .5°F accuracy. You are going to have some uncertainty given the testing environment, so you need as much accuracy as you can afford.

I know you are watching your dollars. But... I would think you should look at spending a couple of hundred on a decent instrument. Also, you will probably want to keep two of them, so you can keep them staggered while one is out for calibration.
 

Big Jim

Super Moderator
#94
How much will that unit cost you for re-certification? That needs to figure into the equation. :)



If your instrument accuracy is 3 degrees, then you should get a thermometer with .5°F accuracy. You are going to have some uncertainty given the testing environment, so you need as much accuracy as you can afford.

I know you are watching your dollars. But... I would think you should look at spending a couple of hundred on a decent instrument. Also, you will probably want to keep two of them, so you can keep them staggered while one is out for calibration.
At $50.00 for a new one with certs, why would you send it out? Just buy a new one.
 
C

Chance

#95
How much will that unit cost you for re-certification? That needs to figure into the equation. :)



If your instrument accuracy is 3 degrees, then you should get a thermometer with .5°F accuracy. You are going to have some uncertainty given the testing environment, so you need as much accuracy as you can afford.

I know you are watching your dollars. But... I would think you should look at spending a couple of hundred on a decent instrument. Also, you will probably want to keep two of them, so you can keep them staggered while one is out for calibration.
I thought +/- 1 degree is acceptable.
 

BradM

Staff member
Admin
#97
At $50.00 for a new one with certs, why would you send it out? Just buy a new one.
You can, but how do you know the previous ones were in tolerance?

There are all kinds of ways to cut the cake. :D I just prefer to have confidence in my calibrating instruments. Otherwise, if something changes in the process, you end up second-guessing everything, including the standard.:)
 

Golfman25

Trusted Information Resource
#99
If my internal procedure accuracy is +/-3 degrees C, should I get a new and calibrated thermometer with 1 degree or 0.5 degree accuracy? According to Brad, I should get a 1 degree accuracy. Why would I get a 1 degree accuracy and not 0.5 degree. Thanks.
What kind of climate control system do you have that can keep a room +/- 3 degrees? Seems kind of tight to me.
 
B

BridgeGap

Respectfully, I think the question has been answered and the discussion is getting into management's thought process. Clearly they have determined the temperature to be an important process variable. The thermometer should be calibrated. Reasons have already been cited.
 
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