Conductivity meter Calibration SOP


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 25oC 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 25oC 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
QCEB
Quality control equipment calibration
F
Format
oC
Degree centigrade
N
Normal
mS/cm
Milisimens per centimeter
%
Percentage
μS
Microsimens


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