Calibration of the conductivity meter
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
- 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