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Possible to use one thermometer across a range ?


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#1 vingal

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Posted 29 July 2019 - 05:01 PM

Do I have to designate one thermometer for Hot readings and other for cold readings????  If the range of the thermometer complies with the range and I have a CCP limit of 30F and the other one is 165F.  if I calibrate the same thermometer with the ice sludge and boiling water point methods. 

 

Regards



#2 Charles.C

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Posted 29 July 2019 - 06:03 PM

Do I have to designate one thermometer for Hot readings and other for cold readings????  If the range of the thermometer complies with the range and I have a CCP limit of 30F and the other one is 165F.  if I calibrate the same thermometer with the ice sludge and boiling water point methods. 

 

Regards

 

Hi vingal,

 

Relevant answers may depend on the context, eg Standard.

 

in Principle one thermometer is feasible. In practice, convenience/accuracy requirements may also be involved.

 

The typical basic requirement is that the thermometer must be appropriately calibrated at the usage temperatures, ie 30,165 degF  (30degF seems unusual. Why not 32degF ?)

 

Boiling Point calibration is IMEX insufficient for CCP usage at 165degF.

 

Most GFSI-recognized Standards IMEX will require external Verification data for the thermometer where CCPs are involved.


Kind Regards,

 

Charles.C


#3 Hank Major

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Posted 29 July 2019 - 08:26 PM

My understanding is that food safety experts believe that at least for the cooking kill step CCP, a line should have two thermometers, from two different manufacturers, hopefully employing two different methods of checking (such as infrared and metal probe).



#4 moskito

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Posted 01 August 2019 - 10:49 AM

Hi,

 

what type of thermometer you are using? What accuracy?

First, you can get calibration certificates for different temperature range.

What we do:

We are using thermocouples, i.e. a reading equipment with different thermo couples each having a certificate for a certain temperature range (color coded; different sensitivity classes etc).

Sensitivity: For some measurements +/- 1 °C is sufficient, for others +/- 0,1 °C is needed -> the less the sensitivity the broader the range of claibration can be.

Stability: For hot reading you need another material stability than for ambient conditions.

-> all these can be handled by using different type of thermocouples

 

For other application we perfer to use loogers - but the questions to be answered are the same.

 

Rgds

moskito






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