Measurement Unit (Measure Unit) - Mettler Toledo Refracto 30P Bedienungsanleitung

Menu (menu)
5.2

Measurement Unit (Measure Unit)

The measurement units of the Refracto 30P are grouped according to their field
of application:
- nD, nDt: General applications
- Sugar: Sugar determinations
- Conc.: General concentration determinations
- Alcohol: Alcohol (Ethanol)
- IPA: Isopropanol
- Salinity: Salt (sodium chloride)
- Wine: Determination of the sugar content in grape juice
- Antifreeze: Antifreeze
nD (refractive index)
Measurement of the refractive index (n
nDt (temperature-compensated refractive index)
Refractive index (n
All results are calculated for the same reference temperature ( T
regardless of the measuring temperature ( T ). Measuring and reference tempera-
ture have to be in the same unit (°C or °F).
Compensated refractive index = measured refractive index + α
10 temperature-compensation coefficients can be stored in the instrument.
The following input is required:
Comp. No.
Comp. Temp.
α x 1000:
Sugar (sugar determinations)
Display of the results as Brix% (sucrose), HFCS42 or HFCS55 (high fructose
corn syrup). See appendix.
Conc. (concentration determinations)
Measurement of the concentration via the input of the desired concentration-
conversion formula y = a + bx at a reference temperature.
y = Concentration in % or without units
a, b = sample dependent coefficients.
x = measured refractive index
10 temperature-compensation coefficients can be stored. Input of the tempera-
ture-compensation coefficients via nDt; calculation of α, see page 9.
8
T
0
) measurement at a reference temperature.
D
Number of the temperature compensation coefficient (0...9)
Reference temperature ( T
Temperature-compensation coefficient. For calculation of α, see
page 9.
).
D
)
0
METTLER TOLEDO Refracto 30P
, e.g. 20°C),
0
( T – T )
•
0