1.0 OBJECTIVE
To lay down the procedure for operation of Conductivity/TDS
meter.
2.0
SCOPE
This SOP shall be applicable to the Conductivity/TDS meter used in
QC Dept.
3.0
RESPONSIBILITY
3.1
Chemist QC and above
shall be responsible for the preparation and execution of this SOP
3.2
Head QC & QA shall
be responsible for the checking and approval of this SOP.
4.0 ACCOUNTABILITY
4.1 Head QC
5.0
PROCEDURE
5.1
Cleaning
5.1.1
Ensure that probe should be properly cleaned.
5.1.2 Ensure that the dry probe should be soaked for
at least 5-10 minutes or longer before calibration.
5.1.3
Wipe the probe with the soft tissue paper so that there
should be no scratch on the probe.
5.2
Calibration
5.2.1
Press the “MODE” key to select the conductivity mode.
5.2.2 Rinse the probe thoroughly with de-ionized water or a
rinse solution, and then rinse a small amount of calibration standard.
5.2.3 Dip the probe into the calibration standard. Ensure
that the probe tip should not be beyond upper steel band.
5.2.4 Press the “CAL/MEAS” to enter conductivity calibration
mode. The CAL indicator will appear in the upper right corner of the display.
5.2.5 Wait for [Ready] indicator to appear before pressing
“ENTER” key to confirm calibration value. The upper display will show “done”
once the calibration is successfully performed. The meter runs to the [MEAS]
mode.
5.2.6 To abort the calibration, press CAL/MEAS to revert back to the measurement mode. No
calibration should be done at this stage.
5.2.7 To perform the next point calibration, repeat the above
steps until all steps have been calibrated.
5.3
Operation
5.3.1 Rinse the probe with de-ionized or distilled water
before use and after each sample and carefully removes all impurities by wiping
off with the tissue paper.
5.3.2
For the removal of proper contamination, rinse the
probe with the small volume of your sample.
5.3.3 Now, press “ON” to switch on the meter and the [MEAS] an indicator appears on the top of the LCD.
5.3.4 Dip the probe into the sample. Make sure that the
solution level is above its upper steel band. Stir the probe gently in the
sample to create the homogenous sample.
5.3.5
Note that reading on the display should be stabilized.
5.3.6
Press the “MODE” to toggle between the Conductivity and
TDS measurement.
6.0
REFERENCES
NA
7.0
ANNEXURE
|
Annexure
No. |
Title of the Annexure |
Format No. |
|
Annexure - I |
Standard
range for calibration of Conductivity / TDS Meter |
F……………… |
|
Annexure - II |
Calibration
record of Conductivity / TDS Meter |
F…………….... |
8.0
ABBREVIATIONS
SOP :
Standards Operating Procedure
QC : Quality
Control
HOD : Head
of the Department
QA :
Quality Assurance
QCD : Quality
Control Department
QAD :
Quality Assurance Department
EQP : Equipment
% : Percentage
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