Hach-Lange DR 5000 brewerie analysis, supplementary software LZV570 - Manual (Page 26)

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Working procedures
2.6.3 Procedure for measuring free amino nitrogen (FAN) in dark worts
1. Prepare three blank value solutions, three standard solutions
and three samples as described in the working procedure.
2. Select STORED PROGRAMS in the “Main Menu”. Select test
number 816 .
3. Insert zero value solution (distilled water) into the cell
compartment, close the cover and touch ZERO .
4. Insert blank value cuvette (see sample preparation) into the cell
compartment. Close the cell compartment. Touch READ .
Display: E1.
Note: Repeat the procedure with blank value cuvettes 2 and 3.
Display: E2 and E3.
5. Insert standard cuvette (see sample preparation) into the cell
compartment. Close the cell compartment. Touch READ .
Display: E4.
Note: Repeat the procedure with standard cuvettes 2 and 3. Display:
E5 and E6.
6. Insert correction cuvette (see sample preparation) into the cell
compartment. Close the cell compartment. Touch READ .
Display: E7.
Note: Repeat the procedure with correction cuvettes 2 and 3. Display:
E8 and E9.
7. Insert the sample cuvette with the first prepared sample into the
cell compartment. Close the cell compartment. Touch READ .
Display: E10.
Note: Repeat the procedure with sample cuvettes 2 and 3. Display:
E11 and then, after the final measurement, the result.
8. The FAN result is displayed in mg/l.
Note: Analysis of additional samples: Repeat working procedure from
point 7.