Conductivity Meter-SOP for Operation and Calibration

This Document describes (Standard Operating procedure) Sop for Operation and Calibration of Conductivity meter

Sop for Operation, Cleaning and Calibration of Conductivity meter

I. Purpose & Scope:

• The Purpose of this SOP is to lay down the procedure to lay down a procedure for Operation, Cleaning & Calibration of Conductivity meter.
• This procedure is applicable for Operation, cleaning & Calibration of Conductivity meter used in Quality Control Department

II. Responsibilities:

• All Quality Control personnel’s shall be responsible to follow and implement this SOP.

III : Introduction and Procedural Part :

IV) GENERAL CLEANING :

• Clean the instrument with a clean dry cloth every day. Occasionally wet cloth dipped in dilute soap solution may be used.
• Precautions has to be taken to clean the instrument immediately with dry cloth to remove the moisture.

V) BASIC OPERATION OF CONDUCTIVITY METER :

• Ensure the electrode connected to the instrument.
• Switch on the main power supply to Instrument and then on the power switch provided on the rear side of the instrument.
• Remove the electrode from purified water beaker, Clean the electrode with tissue paper.
• Dip the electrode carefully in sample beaker / solution in a center position.
• By Pressing the Range key, set the mode as Conductivity ( µs) and Conductivity value will be appear on
• Record the observed Conductivity value on analytical record or as per requirements.
• Remove the electrode from sample & clean with purified water properly and then finally clean with tissue paper.
• Keep the electrode in stand mode in water beaker containing purified water.

VI) CALIBRATION OF CONDUCTIVITY METER :

• Operate the instrument as per above basic operation procedure
• Preparation of calibration standard solution 0.1 M KCl Solution (A): Weigh 0.7456 gm of Potassium chloride and dilute to 100 ml with purified water.
• Preparation of calibration standard solution 0.01 M KCl Solution (B): Weigh 0.07456 gm of Potassium chloride and dilute to 100 ml with purified water.
• Prepare the calibration standard solutions on daily basis before use for calibration.
• The Potassium chloride shall be kept in desiccators over silica. Label the standard solution with name, strength, prepared by, prepared on and use before. Discard the solution after calibration.
• Determine the conductivity of each solution at 25°C for calibration.
• The standard solution preparation and its conductivity at 25°C is given as.

• Remove the electrode form purified water beaker; clean the electrode with clean tissue paper.
• Dip the electrode carefully in Standard solution A (0.1 M KCL) in a center position.
• By Pressing the Range key, set the mode as Conductivity (µs) and Conductivity value will be appear on display.
• Record the observed Conductivity value Annexure I
• Remove the electrode from Standard solution A and clean with purified water properly and then finally clean with tissue paper.
• Dip the electrode carefully in Standard solution B (0.01 M KCL) in a center position.
• By Pressing the Range key, set the mode as Conductivity (µs) and Conductivity value will be appear on display.
• Record the observed Conductivity value Annexure I
• Remove the electrode from Standard solution B and clean with purified water properly and then finally clean with tissue paper.
• Keep the electrode stand in purified water.
• If any discrepancy observed during operating the instrument report to QC Manager & notify the defect to Maintenance Manager to rectify the defect. Affix ‘Under Maintenance Label’ on the instrument.

Calibration Frequency:

• Daily morning before use

VII) ANNEXURE:

Annexure I      :  Daily Instrument Calibration Record –Conductivity Meter.

Annexure II     :  Preparation record for calibration standards

ANNEXURE-I

 DAILY INSTRUMENT CALIBRATION RECORD – CONDUCTIVITY METER

Acceptance Criteria:

1) For Standard Solution of 0.1 M KCL: 12.88 ± 1% mS (Limit: 12.75 to 13.00)

2) For Standard Solution of 0.01 M KCL: 1413 ± 1% πS (Limit: 1399 to 1427)

ANNEXURE-II

PREPARATION RECORDS FOR CALIBRATION STANDARDS

Month          :