Calibration Certificate content for New Equipment

Al Rosen

Staff member
Super Moderator
#1
What should a valid calibration certificate for a new piece of equipment look like? I'm particularly interested in a Temperature/Humidity monitor & logger.
 
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Helmut Jilling

Auditor / Consultant
#2
Re: Calibration Certificate for New Equipment

What should a valid calibration certificate for a new piece of equipment look like? I'm particularly interested in a Temperature/Humidity monitor & logger.
The same information that a calibration cert for a used piece of equipment should contain. There is no real difference. It is a calibration of an instrument that determines the gage can make reliable readings.
 

BradM

Staff member
Admin
#3
Re: Calibration Certificate for New Equipment

The same information that a calibration cert for a used piece of equipment should contain. There is no real difference. It is a calibration of an instrument that determines the gage can make reliable readings.
Agreed. Just roughly:

1. Customer information; company information
2. Date/ time, recall information (if applicable).
3. Standards used information
4. Procedure/ guideline listed
5. Instrument under test specific information
6. Data test points, values observed, tolerances
7. Comments, observations
8. Date, signature, review, etc.

As far as the monitor/logger, it depends. A factory calibration may check voltages, board readings, cold junction compensators, etc. Another may check one channel with a simulator; yet another may check all input channels. So the data could be a paragraph, or three pages long.

Al, is any of that helpful?
 

Jerry Eldred

Forum Moderator
Super Moderator
#4
Re: Calibration Certificate for New Equipment

I won't reiterate what the others have already said. On a certificate for a temp/humidity logger, I would look for three humidity point (low/mid/high), typically somewhere around 20%RH, 50%RH, 80%RH or so. I would look for at least two (preferrably three) temperature data points with ambient being somewhere around the middle.

If there is just a single point cal (particularly on humidity), the accuracy is suspect, as humidity sensors are notorious for non-linearity.
 
D

Daniel Walker - 2011

#5
MEASUREMENT UNCERTAINTY!!!!! the 17025 forum and nobody mentions the need for an uncertainty value? :mg:
 
J

JAltmann

#7
I would also look for whether or not the calibration was accredited or not, meaning performed to ISO-17025. Not that non-accredited may or may not be good, it adds a level of comfort that the calibration was done properly.
 

Jim Wynne

Staff member
Admin
#8
hi, what if a new equipment with calibration certificate is not put in use but kept in storage for 3 months. after that it is used, When will be the date of next Calibration if the periodicity is One year. Is it one year from the date from which it was used or is it one year from the date of manufacture.?
It's your choice, but the device should be calibrated before you release it for production use, regardless of the calibration certificate that it came with. You have no way of knowing its calibration status otherwise.
 

Tagin

Trusted Information Resource
#9
As regards this, what if the Tape was not put to use say for 3 months after being bought along with Calibration certificate.Now when it should be calibrated? Is it one year from the Start date of Actual Usage or one year from the date of Calibration as mentioned in the certificate. Assume the tape was preserved well while in Storage. I have this issue in my organisation. how to answer th auditor reg this.thank u
I think calibration intervals have to be determined by the organization using at least these criteria:
  • Expiration interval of calibration certificate
  • Frequency of use of calibrated device
  • Likelihood of damage and/or wear&tear to calibrated device
  • Risk of producing product with out-of-calibration device
  • Risks (financial, safety, reputation, etc. risks) from delivering product produced with out-of-calibration device
So just going by the expiration on the calibration cert is not really adequate. If you can answer the above criteria for the auditor, I think they will be satisfied.
 
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