Salinity

Salinity analysis is carried out using the KRÜSS OPTRONICTM Digital Refractometer DR 301-95. Before starting inspect the prism window to ensure that it is completely clean. Before each measurement clean the window with a soft tissue. During the measurement the refractometer has to be placed in a horizontal position.

• Calibration: at least once a day, additionally after each change of the setting (e.g. moving of the instrument). Put approx. 1 ml of distilled water (18 - 20°C) onto the prism and close the lid and press ZERO for 3 seconds. The calibration is completed when END is displayed.

• Measurement: Put approx. 1 ml of sample onto the prism and close the lid and press READ / ENTER. Make sure that you write the number down and enter it into the database properly afterward.

• Press scale to change the measurement units if necessary.

• Automatic Temperature Compensation (ATC): should be switched on for each measurement. If ATC is not displayed press FUNC- Y/N, select menu 2, press scale to switch the temperature compensation on and confirm with READ / ENTER.

• Temperature Unit: select from the function-menu (FUNC- Y/N) menu 3, by pressing scale you can change the temperature unit to °C or °F. Confirm with READ / ENTER.