Would you Calibrate this Digital Hygrometer / Thermometer?

Q

QCALPINE

#11
Re: Would you calibrate this instrument?

Thanks to everyone for all the info. This is the first time I have posted a question and I can't believe all the helpful information I have received. While reading through one of our customers PO, it seems they require calibration including without limitation ISO-17025, ISO10012-1, and ANSI Z540. I have two that I am going to send out for ISO-17025 accrediated calibration. The three I have with just certificates of conformance I will use until I have the other two calibrated. Then I am going to place them side by side and see if how accurate the one's I just purchased are and hopefully document something to file that shows they were accurate.

It seems expensive $125 for an $18 instrument, but at least I won't have to worry about it. When I first started working here we had a calibrated one, stickered and all that was within it's window, but didn't read correctly I think it had been dropped. I tried to order one from VWR but they had none in stock and a 3 month estimated delivery date. So I bought the three cheap ones (they were in stock) so I at least had one that worked. I will check Fisher out next time I order. Luckily the broken one was hanging in place when an auditor went through. He checked to make sure it was calibrated and hadn't expired. I never volunteered the info it didn't work. Just replaced it as soon as I got the new ones.

Thanks again.

Thanks again
 
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L

Libnani

#13
Re: Would you calibrate this instrument?

Dear all

I have a similar situation but my position is a bit different .

We are a laboratory and we are preparing to be accredited according to ISO17025 for the calibration of electrical parameters (Resistance , voltage ,..)
and we need a Temperature and humidity datalogger to take several values by day of the temperature in order to measure the variation of the temperature .
this variation wil be used in the calculation of uncertainty of calibration of a resistance .

My question , i receive from the supplier 2 options for the certifcate of calibration :
the first is a certifcate of calibration from an accredited laboratory
and the second is a manufacturer certificate of calibration which costs
5 times less .

As this instrument is used indirectly in my calibrations , can the manufacturer certifcate will be enough ?

thank you .
 

harry

Super Moderator
#14
Re: Would you calibrate this instrument?

.....As this instrument is used indirectly in my calibrations , can the manufacturer certifcate will be enough ?

thank you .
The instrument may be used indirectly but its readings does have a direct effect on the integrity of the calibration results. Therefore it must be calibrated by an accreditated lab.
 
Last edited:
L

Libnani

#15
Re: Would you calibrate this instrument?

I know it should be calibrated , but my question :

is it necessary to be calibrated by an accredited laboratory or it can be calibrated by the constructor which is certified ISO 9001 (5 times less cost) .
 

BradM

Staff member
Admin
#17
Re: Would you calibrate this instrument?

Need calibration from a lab accreditated to ISO 17025 standard.
Agreed.:agree1:

I realize you are trying to save money. I would see the 150725 being a little more costly (as the cliche goes, though, you get what you pay for), the cert for five times less would scare me. Do get a couple of quotations, though.
 
D

Dmokong - 2009

#18
Good day to all,
In my experience in calibration of Thermo-Hygrometer, I have encountered units which has error even though they are newly purchased. So I believed that your equipment for monitoring your temp and humidity should be calibrated. Even though they are certified by the manufacturer, this doesn't mean that it is functioning properly or accurately after they are shipped out to distributor/retailer. Also, the thermo-hygrometer sensors are very sensitive to contamination.
 
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