Conductivity meter Calibration SOP

1.0 OBJECTIVE:

To lay down the calibration procedure of Conductivity meter for reliable and accurate results.

2.0 SCOPE:

This shall be applicable to the Conductivity meter of Quality Control Laboratory.

3.0 RESPONSIBILITY:

3.1 Technical Assistant/ Helper.

3.2 Q.C Analyst.

4.0 ACCOUNTABILITY:

4.1 Manager-Quality Control.

4.2 Head of the Q.C Department.

5.0 MATERIAL AND EQUIPMENT:

5.1 Conductivity meter.

6.0 PROCEDURE:

6.1 Before starting calibration makes sure that the instrument is in correct measurement mode.

6.2 Wash the electrode with deionized water after and before use and store it dry.

6.3 Change the buffer after one week or when required, and record the details.

6.4 Perform the calibration using standard buffer of 1413μS and record the details.

6.5 Press the mode key to select conductivity mode the conductivity indicator appears in the upper right hand corner of the display.

6.6 Rinse the electrode thoroughly with deionized water or a rinsing solution do not wipe the probe this causes the electrostatic charge on the glass surface.

6.7 Dip the electrode into the calibration buffer, the end of the probe must be completely immersed into the sample. Stir the probe gently to homogenize the sample.

6.8 Press CAL/MEAS key to enter conductivity calibration mode. The CAL indicator will be shown. The primary display will show the measured reading while the smaller secondary display will indicate the conductivity standard buffer solution.

6.9 Press HOLD/ENTER key to confirm calibration. The meter is now calibrated to the current buffer.

6.10 Rinse the electrode with de-ionized water or a rinse solution and store it dry.

6.11 Note down in annexure-1.

6.12 Preparation of standard buffer of 1413μS:

6.12.1 Dissolve 0.7459g of potassium chloride in distilled water made up to 1 liter of solution i.e. 0.01N solution.

6.12.2 At 25^oC this has a conductivity of 1413μS/cm.

6.13 Record the result on the “Calibration Record”, “Calibration Log Book” & paste the “Calibration Status Sticker” on Conductivity meter.

7.0 REVISION LOG:

Revision No.	Effective Date	Reason
00		New SOP

8.0 REFERENCES:

8.1 Not Applicable.

9.0 ANNEXURES:

Annexure 1: Calibration record of Conductivity meter.

Annexure: 1

Calibration record of Conductivity meter

CALIBRATION RECORD OF CONDUCTIVITY METER

Calibration date	Date of last calibration done	Next due for calibration

INSTRUMENT DETAILS:
Name of equipment	Conductivity meter
Make
Model no.
Identification no.
Frequency	Daily

Date	Conductivity at 25^oC mS/cm	Sign

Conclusion: Satisfactory/ Not satisfactory.

Calibrated by/date	Checked by/date

10.0 ABBREVIATIONS:

Abbreviation	Expanded Form
SOP	Standard operating procedure
&	And
No.	Number
Ltd.	Limited
Q.C	Quality control
Q.A	Quality assurance
QCE_B	Quality control equipment calibration
F	Format
^oC	Degree centigrade
N	Normal
mS/cm	Milisimens per centimeter
%	Percentage
μS	Microsimens