To lay down the procedure for Operation, and Calibration of conductivity
1.1 To lay down the procedure for Operation, and Calibration of conductivity / TDS Analyzer Equipment identification No: xxxxx
2.0 SCOPE
2.1 This Sop covers the operation and Calibration of procedure of conductivity / TDS analyzer.
3.0 RESPONSIBILITY
3.1 Chemist / Microbiologist
4.0 ACCOUNTABILITY
4.1 Head - Quality Control
5.0 PROCEDURE
5.1 OPERATION
5.1.1 Connect the power cord to the 220 V AC supply socket (Properly grounded).
5.1.2 Fix the ATC probe and Cell to the clip provided on the stand.
5.1.3 Connect the cell to BNC socket at the back of the instrument.
5.1.4 Switch ON the power supply, indicator lamp glows.
Note: If print out of the sample is required connect printer to RS-232 connector provided at the back of the instrument.
5.2 PROGRAM MODE:
5.2.1 Press PRG/CAL Key to enter into Program Mode “PASSWORD” Menu displays.
5.2.2 Enter the password ‘100’ by using ? or ? Keys and press OK.
5.2.3 Screen displays 1.‘PROG’, ‘CAL’, 2.’PRG’ ‘Option’ and ‘PRG’ ‘Clock’.
5.2.4 Use ? or ? keys at 1.2.3. Position as required and press ‘OK’.
5.2.5 PRG/CAL key to exit program Mode menu.
5.2.6 Enter the usage time in Equipment usage logbook
5.3 OPERATION FOR CALIBRATION
5.3.1 Set the parameter of Option Mode displays ‘PRG’ ‘Calib’.
5.3.2 Select by pressing OK Key, displays “SENSOR CAL”.
5.3.3 PRESS OK key displays “dip cell in to standard solution (5.3.11.)”.
5.3.4 Press OK key to set the desired temperature using ? or ? Keys and press OK to accept the set temperature.
5.3.5 Dip the cell in known conductivity solution and press OK displays the reading.
5.3.6 The LED lamp (m s/ppm or mS/ppt ) glows.
5.3.7 Using ? or ? Keys the measured value shown in segment display can be adjusted to the required STD.value. This will automatically update Cell constant.
5.3.8 Press OK key to go to save Menu in order to save the calibrated value display shows Save Y or Save N.
5.3.9 Use ? to toggle between Y and N.
5.3.10 Select Y to store the calibrated value or N to Skip.
5.3.11 Preparation of standard solutions of potassium chloride
(Reference BP – A182 - O)
5.3.11.1 Dissolve 0.0149g of Potassium chloride separately in 1000g of carbon dioxide-free water. The conductivity of carbon dioxide-free water shall be not more than 2µS.cm-1.The concentration values and the conductivity are included as below.
5.3.11.2 Prepare the above solution as on when required and enter the details in Annexure –II.
Conductivity of potassium chloride solutions at 200C
5.3.12 Calibration
5.3.12.1 Using the potassium chloride solution prepared as directed in 5.3.11 Calibrate the conductivity meter as per Annexure I.
5.3.12.2 For determinations made at temperatures other than 200C the following equation shall be used to correct the conductivity of the potassium chloride solutions indicated in the table. The equation is valid in the range 20+5 0C
CT=C20 [1+0.021(T-20)]
Where T = Temperature at which the conductivity value is
to be measured.
CT = Conductivity of the solution at T0C
C20= Conductivity of the solution at 200C
5.3.12.3 Enter the details of calibration in Annexure –I.
5.4 FREQUENCY
5.4.1 Once in a day before start.
Conductivity, calibration, operation, temperature
