1.0 PURPOSE
1.1 To lay down the procedure for operation of pH meter.
2.0 SCOPE
2.1 This procedure is applicable for the operation of pH meter model no. Cyber scan 510 with identification nos. XXXXX& XXXXX in XXXXX laboratory of Module I and II.
3.0 RESPONSIBILITY
3.1 Junior Assistant / Senior Assistant –Quality Control
4.0 ACCOUNTABILITY
4.1 Manager-Quality Control
5.0 PROCEDURE
5.1 Connect the pH meter to 230 volts A/C supply.
5.2 Check the connection of the sensor electrode in the socket of meter’s BNC connector marked “input” & ATC (automatic temperature compensation) probe to the clip provided on the stand.
5.3 Connect the pH electrode to the electrode arm connected on the side bar.
5.4 Clean the electrode with distilled water and wipe with tissue paper.
5.5 Switch on the power supply.
5.6 Press ON key to switch pH meter on. All the LCD (Liquid crystal display) segments will display momentarily for a few seconds and the LCD then switches to the last measurement mode by displaying “MEAS”.
5.7 Press MODE key to select pH measurement mode and press CAL/MEAS key if calibration is performing. Otherwise again pressing this key shows measurement mode.
5.8 Rinse both pH electrode and temperature probe well with purified water.
5.9 Dip electrode and temperature probes in to the sample, making sure that the glass bulb of the electrode must be completely immersed in to the sample.
5.10 Stir the probes gently to create a homogeneous sample
5.11 Allow two minutes time for reading to stabilize. The READY mode display at left side of LCD shows the readings are stable with in a range of +0.01pH. Take the reading.
5.12 Note the reading in to a pH meter logbook as per Annexure-I (as per QA SOP format no. XXXXX-current version).
? If the reading is not stable, electrode shall be regenerate with 0.1N HCl for about 2 hrs.
5.13 After the completion of analysis clean the electrode with water thoroughly to avoid any sample traces.
5.14 Store the electrode in purified water when not in use.
END OF THE DOCUMENT
Ph meter, quality control, ph electrode
