Xylem E-Line 80 Refractometer - Manual (Page 6)

°Brix to Refractive Index Conversion Table (Table 3)
The table below can be used to convert °Brix readings taken from the instrument scale into
refractive index.
°Brix
Refractive Index at
589.3nm and 20.0°C
°Brix
Refractive Index at
589.3nm and 20.0°C
°Brix
Refractive Index at
589.3nm and 20.0°C
0 1.33299 30 1.38115 60 1.44193
1 1.33442 31 1.38296 61 1.44420
2 1.33586 32 1.38478 62 1.44650
3 1.33732 33 1.38661 63 1.44881
4 1.33879 34 1.38846 64 1.45113
5 1.34026 35 1.39032 65 1.45348
6 1.34175 36 1.39220 66 1.45584
7 1.34325 37 1.39409 67 1.45822
8 1.34477 38 1.39600 68 1.46061
9 1.34629 39 1.39792 69 1.46303
10 1.34782 40 1.39986 70 1.46546
11 1.34937 41 1.40181 71 1.46790
12 1.35093 42 1.40378 72 1.47037
13 1.35250 43 1.40576 73 1.47285
14 1.35408 44 1.40776 74 1.47535
15 1.35568 45 1.40978 75 1.47787
16 1.35729 46 1.41181 76 1.48040
17 1.35891 47 1.41385 77 1.48295
18 1.36054 48 1.41592 78 1.48552
19 1.36218 49 1.41799 79 1.48811
20 1.36384 50 1.42009 80 1.49071
21 1.36551 51 1.42220
22 1.36720 52 1.42432
23 1.36889 53 1.42647
24 1.37060 54 1.42862
25 1.37233 55 1.43080
26 1.37406 56 1.43299
27 1.37582 57 1.43520
28 1.37758 58 1.43743
29 1.37936 59 1.43967
Data Source:
ICUMSA Methods Book, Specification and Standard SPS-3 (2000), Refractometry
and Tables - (Official)
Page 4