How to perform a Water Zero
Step-by-step instructions for performing an Air/Water Zero on a computer based refractometer.
- Clean and dry the prism to be certain there is no sample or any sort of residue on the prism, alcohol or acetone works well.
- Select the Zero option shown directly below the green start option. If asked for a passcode, enter 123 then select Login.
- With the prism clean and dry, cover the prism and select Air, then select Continue. The instrument will perform the air calibration.
- Select OK
- Select Zero again and enter the passcode 123 if asked to do so
- Place a distilled water sample on the prism, enough to cover the complete glass
- Select Water
- Monitor the screen until the reading is stable then select Continue
- The instrument will begin the water calibration. Once completed, the previous and new value will be displayed.
- Select Save, then OK
- With the water still on the prism, select Start to measure the water sample and confirm that water passes.
