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PH - Calibration


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ahmed al heseky

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    Egypt

Posted 11 November 2011 - 07:58 AM

Good morning all....

I have two questions

1 - How is the work of calibration device for pH?
2 - What is the time required between each other and calibrated according to ISO 9001 and ISO 22000?


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Thank you very much...


------------------------<BR closure_uid_v0mkap="1357" Tc="null">Ahmed Al_husaki - Egypt<BR closure_uid_v0mkap="1358" Tc="null">vice labs maneger<BR closure_uid_v0mkap="1359" Tc="null">Modern Sciences and Arts University<BR closure_uid_v0mkap="1360" Tc="null">00201271008700-00201225784983

faisal rafique

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Posted 12 November 2011 - 05:37 AM

Dear,
First question as i understood that how calibration has importance to pH meter. Actually calibration compensates deviations of asymmetry potential and slope of the electrode over time. calibration with buffer ( two or three point calibration) solutions corrects variations in the electrode response.
Calibration frequency may be between oh and 7 days, but mostly programmed for daily calibration (three step daily is recommendable).

Faisal






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