Operation & Calibration of Conductivity meter

Operation & Calibration of Conductivity meter


To lay down the procedure for operation & calibration of conductivity meter.

2.0      SCOPE :                                  

2.1        This SOP is applicable for production department (SVP) for Operation and calibration of Conductivity meter.

Make                                                 Modal

Eutech                                               CON 700 


3.1       References

3.1.1    In House & User Manual

3.2       Attachments

3.2.1    Attachment-I     Daily Calibration Record of Conductivity Meter


4.1       Production  Person:

4.2.2    To Prepare the SOP & maintained the record.

4.2       Production Head:

4.2.1    To ensure the compliance & implementation of SOP.

4.3       Quality Assurance Persons

4.3.1    To verify that all the instructions are followed properly as per the given SOP.

4.3.2   To ensure implement of the SOP.


  1. Production
  2.  II.   Quality Assurance.


6.1       Definition


6.2      Abbreviations

6.2.1    SOP                : Standard Operating Procedure

6.2.2    QA                   : Quality Assurance

6.2.3    PROD.              : Production

6.2.4    C.C. No.          : Change Control Number

6.2.5    TDS                 : Total Dissolved Solid

6.2.6    PPM                :  Parts Per Million


7.1 Cleaning:

    • Before cleaning, switch off the instrument & disconnect from the main power supply.
    • Clean with dry & lint free cloth & brush.

7.2        Procedure for determination of Conductivity:

7.2.1     Switch ON the mains.

7.2.2     Press on/off key on control panel of Conductivity meter.

7.2.3     Display will automatically begin within 3-5 second & will display “MEAS”, conductivity in  “µS”  & temperature in “ºC” on the screen.

7.2.4     Then wash the electrode with purified water & dip the electrode in sample for which  conductivity to be measure, & hold the same until the electrode get stabilize.

7.2.5     As the conductivity in the display get stable, record it & remove the electrode from the sample          solution.

7.2.6     Again wash the electrode and dip it in purified water/distilled water.

7.2.7     If the conductivity meter is not in further use press ON/OFF key & switch off it.

7.3        Procedure for determination of TDS (Total Dissolved Solid)

7.3.1     When it show the conductivity on display screen then press the mode key, display will show  the unit in ppm.

7.3.2     Wash the electrode with purified water and dip the electrode in sample solution and measure the TDS of sample in ppm.

7.4        Calibration

7.4.1     Preparation of 0.0006M solution of Potassium chloride (84 µS)  Weight  about 44.74 mg of anhydrous Potassium Chloride reagent in 1000ml volumetric flask add purified water to dissolve and make up to volume 1000ml with same solvent.

 7.4.2     Preparation of 0.01 M solution of Potassium chloride (1413 µS)  Weight  about 745.6 mg of anhydrous Potassium Chloride reagent in 1000ml volumetric Flask, add purified water to dissolve and make up to volume 1000ml with same solvent.

7.5       Method of calibration:

7.5.1    Operate the instrument as per procedure given above 7.3.1 to 7.3.8.

7.5.2    Press a Cal / means key for calibration mode and ‘Cal’ appear on the screen.

7.5.3   Then dip the electrode in 1413µS/cm conductivity solution previously adjusted at temperature 25 ± 1°C when conductivity get stabilize in display, press enter and note the conductivity in Attachment-I.

7.5.3    Wash the electrode and repeat the step 7.6.2 for 84 µS/cm conductivity solution and note the observations in Attachment-I.

7.5.4    Attach calibration status tag on the instrument at suitable place.

7.5.5    If parameter does not meet the specified limits then immediately paste the label “Out of Calibration, Do not Use” on the Instrument and Inform to Production Manager.

7.6     Acceptance criteria

  • Acceptance limit for Conductivity 1413± 5µS/cm.
  • Acceptance limit for Conductivity 84± 2µS/cm.
  • Acceptance limit for Conductivity 9±2µS/cm.
  • Temperature 25 ± 1°C

  7.7    Frequency

7.7.1    Daily

7.8       Precautions

7.8.1    Ensure that the Instrument is clean & free from dust.


Version No. 00 Effective date

Detail of revision – New SOP


Company logo Company Name & address


Instrument  ID Number            
Make   Model No.
SOP No.   Location
Sr. No. Calibration Date Buffer solution Preparation Date      Observed Conductivity Done By Checked By Remarks
Calibration Verification
(Limit:  84±2µS) (Limit.:

1413 ±5µS)

(Limit:  14.9±2µS)


About Pharmaguidanaces Channel

Ms. Abha Maurya is the Author and founder of pharmaceutical guidance, he is a pharmaceutical Professional from India having more than 18 years of rich experience in pharmaceutical field. During his career, he work in quality assurance department with multinational company’s i.e Zydus Cadila Ltd, Unichem Laboratories Ltd, Indoco remedies Ltd, Panacea Biotec Ltd, Nectar life Science Ltd. During his experience, he face may regulatory Audit i.e. USFDA, MHRA, ANVISA, MCC, TGA, EU –GMP, WHO –Geneva, ISO 9001-2008 and many ROW Regularities Audit i.e.Uganda,Kenya, Tanzania, Zimbabwe. He is currently leading a regulatory pharmaceutical company as a head Quality. You can join him by Email, Facebook, Google+, Twitter and YouTube

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