Page 11
SBS-2500 Manual 09-15-TI2500
Plato
Measurement of °Plato at 20°C.
Proof
Measurement of the Proof degree at 60°F.
The Proof degree is a unit used to determine the ethanol content.
Proof (US): Measurement with US unit (100v/v% = 200 US Proof).
Proof (IP):
Measurement with IP unit (100v/v% = 175 British Proof).
Conc. (Concentrations)
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 density.
The following units are possible for x:
•
1/compensated density -1
•
compensated density -1
•
compensated density
•
1/specific gravity -1
•
specific gravity -1
•
specific gravity
Calculation of the temperature-compensation coefficient α
Measure density of the sample:
•
at a temperature (T
1
) above the normal measuring temperature,
•
at a temperature (T
2
) below the normal measuring temperature.
Calculate α according to the formula:
density at T2 = density at T1
•
(1 + α
•
(T
1
- T
2
))
or
α
=
(
density at T
2 - 1
)
/ T
1
- T
2
density at T
1
Enter value α x 1000 into the instrument.
Note
The temperatures T
1
and T
2
have to be entered into the selected unit (°C or °F, see chapter 5.3).
Example
(measured) density at 26°C (T
1
) 0.7844 g/cm
3
(measured) density at 15°C (T
2
) 0.7937 g/cm
3
α
=
(
0.7937 - 1
)
/ 26 - 15
0.7844
α = (1.011856 - 1) / 11 = 0.011856 / 11 = 0.001078
α x 1000 =
1.078
; enter this value into the instrument.
10 temperature-compensation coefficients can be saved. Input of temperature-compensation coefficients via
Comp. Density. For typical temperature-compensation coefficients, see Chapter 13.2.
