Calibration of the conductivity meter

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Calibration of the conductivity meter

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1 Calibration of the conductivity meter
2 CONCISE COURSE IN PHARMA QUALITY ASSURANCE (SEM VI) B.PHARM

PROCEDURE

Calibration of the conductivity meter is undertaken by the
standardization with different reference solutions of known conductivity and
measuring the response on the instrument

SOLUTION REQUIRED FOR CALIBRATION:

 Prepare the reference conductivity solutions ranging from 0.01M to 1.00M
having a conductivity range of 1.4 to
111.9milli-mhos/cm.

     (Ref.: APHA, Ed. 20, 1998, 7.4565gm of KCl. in
100ml will give 1Molar solution).

CONCISE COURSE IN PHARMA QUALITY ASSURANCE (SEM VI) B.PHARM


 

PROCEDURE FOR CALIBRATION:

  •  Switch on the instrument and allow to
    stabilize for 20 to 30 minutes.
  • Under the stipulated operating conditions
    measure the conductivity of   different
    reference     conductivity solutions allowing the readings
    to stabilize before reading the conductivity.
  • Adjust the conductivity meter (if possible)
    according to the conductivity observed.
  • Make a table of conductivity of
    different concentration of KCl molar solution and its     conductivity.  
  • Select appropriate
    concentration range of the KCl solution for the determination of the
    conductivity of the sample. The KCl standard solution should be prepared
    exactly by taking the accurate weight of the pure reagent.
  • The conductivity of the
    standard KCl solution is checked with the conductivity meter. If     any deviation is observed, make
    necessary adjustment to the conductivity through the     knob provided

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