This document details the procedure for the operation and calibration of a total dissolved solid meter(TDS Meter calibration) -DiST.
It is the
policy of Xyz Limited that a written procedure shall be followed for the
operation and calibration of the total dissolved solid meter(TDS)-DiST and its use
monitored to ensure smooth operation and its use monitored to
obtain consistent and reproducible results and to minimize downtime and
to meet regulatory requirements.
This
procedure is to be applied at the time of operation and calibration of the total dissolved solid meter-dist.
RESPONSIBILITY
Persons
along with their responsibilities and accountability are given below:
Executive –Corporate
Quality Assurance:- To prepare the SOP. To maintain in the records as per SOP.
Assistant – General Manager: - To ensure implementation of
SOP.
Operation and Calibration of TDS Meter
5.1 PRELIMINARY CHECK
5.1.1 Check
if the instrument is clean and free from dust, if not; clean it with lint-free
cloth/tissue paper.
5.2 PRECAUTIONS
5.2.1
Total dissolved solid meter-dist should be rinsed between sample
measurements with purified water or distilled water. Never rub the tip
of the total dissolved solid meter-dist to remove excess water, just
blot the tip end with clean tissue paper to remove residual drops.
5.2.2 Allow sufficient time for the probe to stabilize in the sample response as
given under.
5.2.3 For the greatest accuracy, ensure that no particulate matter is suspended in
the test solution. If necessary, filter the solution before the
determination.
5.3 OPERATION
5.3.1 Remove
the protective cap and turn the DiST ON.
5.3.2 Immerse
it in the sample up to the maximum immersion level without touching the bottom
of the beaker. Stir gently and wait until the display stabilizes. DiST
compensates for the temperature variance automatically.
Read
the value automatically. This value has to be multiplied by a factor of 10 for
DiST1as shown on the upper left-hand corner of LCD to give direct readings in
ppm (mg/l).
5.3.5 Switch off the instrument when not in use.
5.3.6 Maintain the Logbook of total dissolved solid meter-dist on XYZ/SOP-090/FR-01as
Logbook for total dissolved solid meter-dist Appendix I.
6.0 CALIBRATION PROCEDURE total dissolved solid meter
6.0.1 Calibration
Frequency: Half-Yearly
6.0.2 Use DiST1 HI70032P Calibration kit 1382 ppm (mg/L).
6.0.3 The calibration procedure is very simple and fast.
6.0.4 Immerse the tester up to the maximum level in the appropriate DiST1 HI70032P
calibration solution
6.0.5 Allow the reading to stabilize and using a small screwdriver turn the
calibration trimmer to match the solution value at 25 ºC.
Acceptance
Criteria:
|
Sr.
No. |
Solutions
to be used for Half Yearly calibration |
Limits
(mS) |
|
1.0 |
1380 ppm |
±2% |
6.0.6 To maintain the temperature of the total dissolved solid solution, place
it in an ice bath.
6.0.7 Discard the disposed of total dissolved solid solution after the
calibration.
6.0.8 Record the calibration data as per XYZ/SOP-090/FR-02 Appendix II
6.0.9 Report any discrepancy observed during the operation and calibration of the instrument
to the Section In-charge or his representative for corrective and preventative action as per SOP No. XYZ/SOP-030, CAPA.
6.0.10 Section
In-charge or his representative will take the necessary action and report the
same to Manager-Quality Assurance.
6.0.11 Affix the “Out of Order” label on the instrument as per SOP No. SOP Labeling Policy.
7.0 GENERATION OF INSTRUMENT CALIBRATION NUMBER
Generate
the instrument calibration number on the calibration datasheet as INSCALXXYYZZZ
where INS denotes instrument, CAL denotes calibration, XX denotes the year, YY
denotes month and ZZZ denotes sequence number.
8.0 ABBREVIATION
XYZ XYZ Limited
SOP Standard Operating Procedure
CQA Corporate Quality Assurance
CAPA Corrective and Preventative Action
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