SOP for Operating & Calibration of Conductivity Meter

1.0      Objective:

            The objective of this standard operating procedure is to lay down the procedure for

            operating & calibration of Conductivity Meter .

2.0      Scope:

This SOP covers operating procedure of Conductivity Meter.

3.0      Responsibility:

           Jr. Research Officer, Research Officer: Responsible for operation, calibration and  

           maintenance of the instrument as per procedure.

           Head of Department: Responsible for calibration and maintenance, timely as per schedule.

           QA officer/QA Manager: Review the records and governing the document.

4.0       Procedure:

4.1       Procedure for operation:

4.1.0    Ensure that instrument is visibly clean and free from dust.

4.1.1    Connect the conductivity probe to the instrument.

4.1.2    Switch “ON” the instrument.

4.1.3    Set the temperature at 25 °C with the help of temperature Knob.

4.1.4    Submerse the probe into the solution to be tested.

4.1.5    The sleeve holes must be completely submersed. Tap the probe repeatedly to remove

any air bubbles that may be trapped inside the sleeve.

4.1.6        The conductivity value will be displayed on the primary LCD and the temperature on

the secondary LCD.

4.1.7        If the reading is out of range, the full-scale value will be displayed blinking.

4.2       Procedure for calibration:

4.2.1    Rinse the probe with calibration solution or deionized water.

4.2.2    The sleeve holes must be completely submersed.

4.2.3    Tap the probe repeatedly to remove any air bubbles that may be trapped inside the sleeve.

4.2.4    To enter EC calibration, select the EC range and press CAL.

4.2.5    The “BUF” and “CAL” tags are displayed.

4.2.6    Selectable calibration points for conductivity are 0.00µS for offset and 1413 µS for slope.

4.2.7    For 1413µS calibration prepare KCL solution (0.7455gm/Lit in CO2 free water), using AR/GR grade KCL dried at 180°C for 1 Hour.

4.2.8        Cool the solution at 20°C and measure its conductivity. Wash the cell with distilled water & restore it in the same.

Note:   CO₂ free water is prepared by boiling distilled water for 10 minutes & cooling it in CO₂ free atmosphere (Desiccators containing NaOH flakes in bowl).

Acceptance Criteria:

The observed conductivity should 1.330 ± 1% at ms/cm at 20 °C.

Frequency: Daily

5.0       Routine maintenance:

5.1       Clean instrument with dry cloth.

5.2       Clean the electrode and temperature knob with wet

6.0       Documentation:

6.1       Annexure – 1 -  Usage log book.                    XXX/FRM/000

6.2       Annexure – 2 - Calibration record.                 XXX/FRM/000

7.0       History of Revision:

Revision No.	Effective Date	Revision details	Reason for revision

Annexure - 1
Date	Booking No.	Name of sample	Remark	Sign
SOP No. : XXX/SOP/000         Format No. : XXX/FRM/000-00

ANNEXURE - 2

DAILY CALIBRATION DATA Instrument  :  Conductivity meter                 ID              : Make            :                                                  Model        :                Month     :                                 Frequency : Daily (KCl Make)  :                                                  Batch No. : Date Observed conductivity Signature Remark 1.3167 – 1.3433mS/cm @ 20°C        SOP No. : XXX/SOP/000        Format No. : XXX/FRM/000-00