Use and Calibration of Conductivity Meter

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1.0 Purpose 
 
 The purpose of this procedure is to provide guidelines for the use and calibration of the VWR
 
 Model 89094-958 conductivity tester for use in the QC microbiology department.
 
 2.0 Scope 
 
 This procedure gives general guidance for the use of the Conductivity Meter. This procedure
 
 also give specific instructions on calibration of the conductivity meter. This procedure
 complies with USP<645> water conductivity. 
 
 3.0 Responsibility 
 
 3.1 It is the responsibility of QC laboratory personnel to follow this procedure.
 
 3.2 It is the responsibility of QC Laboratory Management to implement this procedure and
 
 to ensure that the procedure is being followed. 
 
 3.3. It is the responsibility of QC Laboratory Management to keep the procedure current
 
 with the latest Ion Labs practices. 
 
 4.0 Definitions 
 
 4.1 ATC — Automatic Temperature Correction 
 
 42 QC -— Quality Control 
 
 5.0 References 
 
 5.1 USP <645> Water Conductivity 
 
 

[SOP 

 Standard Operating Procedure SOP No | Rev 
 D-809 1 Page 2 of 3 
 Use and Calibration of Conductivity Meter 
 
 5.2. E-705-F1, Form, Municipal Water Test Ticket 
 
 5.3 E-705-F2, Form, Purified and Millipore Water Test Ticket 
 
 5.4 E-705-F3, Form, Conductivity Stage 2 Test Ticket 
 
 5.5 Traceable Conductivity Meter Instructions 
 
 6.0 Procedure 
 
 6.1 Operation 
 
 6.1.1 Place the probe in fresh Millipore water for 30 minutes to thoroughly rinse the
 
 meter probe. 
 
 6.1.2 Turn the meter on by pressing the SET button. 
 
 6.1.3. Place the probe head into the solution being measured. Ensure that calibration
 
 was completed as in step 6.2. 
 
 6.1.4 Ensure that the probe head and temperature sensor are completely immersed.
 
 6.1.5 Ensure that there is adequate movement of the liquid around the tip, this can be
 achieved by swirling the meter in the liquid. 
 
 6.1.6 Take measurement. 
 
 6.1.7. The HLD button can be pressed to freeze the measurement prior to recording the
 
 value. Press this button again to unfreeze the measurement. 
 
 6.2. Daily Calibration 
 
 6.2.1 Conductivity meter should be calibrated daily prior to use. 
 
 Place the probe in fresh Millipore water for 30 minutes to thoroughly rinse the
6.2.2 meter probe.

 6.2.3 Turn the meter on using the SET button. 
 
 

[SOP 

 Standard Operating Procedure SOP No | Rev 
 D-809 1 Page 3 of 3 
 Use and Calibration of Conductivity Meter 
 
 6.2.4 Place the probe head in the Conductivity Standard that is closest to the value of
 
 the samples being tested. (ex : use 1.0uS/cm for distilled/purified water samples,
 use 1413 uS/cm for municipal water.) 
 
 6.2.5 Press and hold the CAL button for three (3) seconds.. 
 
 6.2.6 Press the Up Arrow or the Down arrow buttons to adjust the display to the
 
 known value of the Conductivity standard. 
 
 6.2.7With the known value of the conductivity standard appearing and the ready
 
 flashing, press the ENTER button, the meter will return to the measurement
 
 display. 
 
 6.3 Calibration Notebook 
 
 6.3.1 This notebook will record the following information each time the Conductivity
 Meter is calibrated: 
 
 6.3.1.1 Analyst calibrating the conductivity meter 
 
 6.3.1.2 Date 
 
 6.3.1.3 Lot number, concentration, and expiration date of conductivity
 standard used. 
 
 6.3.1.4 The recheck value of the conductivity standard in normal mode.
 
 7.0 Revision History 

| Rev | Date | Description of Changes | CCR # | By |
|-----|----------|------------------------|-------|----|
| 0 | 06/24/21 | New. N/A G. Shaw ; 04/08/22 Changed SOP to new meter model and its instructions for use and CC-22-0167 G. Shaw calibration. | - | - |