STANDARD OPERATING PROCEDURE LAB EQUIPMENT AUTOMATIC DIGITAL REFRACTOMETER MODEL: DG-NXT

STANDARD OPERATING PROCEDURE

SUBJECT :                                             LAB EQUIPMENT AUTOMATIC DIGITAL REFRACTOMETER MODEL: DG-NXT

DEPARTMENT          : QA SOP NO.                      : Page No                       : Effective Date             : Next Review                : SOP REVISION           :

             

1.0       OBJECTIVE:

To provide guidelines for Operation & Maintenance of Automatic Digital Refractometer.

2.0        POLICY:  

To establish a procedure for an operation of Automatic Digital Refractometer.

                                       

3.0       PROCEDURE: 

3.1.      Open the Flap cover of the prism and ensure the prism surface is free from dust, or any other particle. Incase not then clean the prism surface gently with distilled water and wipe the same with Cotton or Tissue paper

3.2.      Switch on the instrument by pressing ON / OFF switch. The current power level of the 9V battery fitted is shown on the top right corner of the LCD screen.

3.3       Select the desired scale (Refractive Index, nD / Brix) by pressing the scale key & keep it pressed till the scale indication points on the desired scale shown at the bottom of the screen for P&G Blue Hawaii select the refractive index option.

3.4.      Calibrate the instrument by using DI water. Place approx 1 ml of DI Water on the prism surface. Close the flap cover, wait for 30 seconds. Calibrate the instrument by pressing the Zero key pressed till CAL is displayed on the screen. Then release the calibration reading is displayed on the screen, RI of water is 1.3333. Then pres zero key. The display will be ……

           

3.5.      In case Temperature compensated reading is required then the automatic Temperature compensation function needs to be switched ON (Indicated by the symbol “ATC” on the LCD screen). In case “ATC” is not appearing on the screen press FUNCTION key thrice. Then “ATC.Y” will appear on the screen. Select the option Y by pressing the scale key. Then press Read/Enter key to confirm your setting. Now recheck whether ATC appearing on screen. If this function needs to be switched off, same procedure needs to be followed wherein after pressing Function key thrice. Then “ATC.N” will appear on the screen which needs to be select.

3.6.      Take small amount of sample (approx 1ml) to be measured with the help of a dropper and put in on the prism surface gently. Close the flap cover. Press the READ key. The value will instantly be displayed on the LCD screen. There after the measurement is done gently clean and wipe the prism with distilled water and tissue paper after use.           

4.0       FREQUENCY: As and when required.

5.0       RESPONSIBILITY:   QA Executive

6.0       REVIEW GUIDE: Equipment’s manual.          

7.0       ANNEXURE: ---------

8.0       SOPs DISTRIBUTION:

            This SOP shall be distributed to following Departments:

Name of the Department	Master Copy	Circulatory Copy
QA/QC	√	√
Production	x	x
Warehouse	x	x
General	x	x
Maintenance	x	x