Measuring Extract

Question 1

What is a saccharometer?

Answer 1

A specialised hydrometer used to measure SG or ˚Plato

Traditional method for determining sugar concentration in wort.

Question 2

What modern instrument can be used to measure sugar concentration quickly and accurately?

Answer 2

Densitometer

An alternative to saccharometers for measuring sugar concentration.

Question 3

What two methods can be used to express malt extract?

Answer 3

• % w/w (using EBC method)
• L˚/kg (litre degrees per kg) (using IoB method)

Different regions may use other methods.

Question 4

What does L˚ (litre degree) represent?

Answer 4

The product of volume (L) x degrees gravity

It indicates the concentration of extract in malt.

Question 5

If malt extract has 300 L˚/kg, what does that imply for one kg of malt?

Answer 5

It will produce varying possibilities of volume and gravity, but their product will always be 300

This relationship is essential for calculating extract.

Question 6

How is the gravity calculated if 300 L˚ of extract are dissolved in 15 L of wort?

Answer 6

300 L˚/15 L = 20 ˚ (SG 1.020)

This formula helps determine the specific gravity of the wort.

Question 7

What is the volume calculation if the gravity is 60˚ (SG 1.060) for 300 L˚ of extract?

Answer 7

300 L˚/60˚ = 5 L

This calculation is used to find the volume from a given gravity.

Question 8

What does 1% w/w extract equate to in L˚/kg extract?

Answer 8

3.86 L˚/kg extract

This value is useful for quick mental comparisons in extract calculations.

Question 9

What must be considered regarding the basis of malt extract value?

Answer 9

Whether it is expressed on a ‘dry’ basis or an ‘as is’ basis

This distinction is crucial for accurate extract calculations.

Question 10

How do you correct a dry basis extract value for moisture content?

Answer 10

Adjust for the moisture content of the malt (around 5% w/w)

This correction provides the actual ‘as is’ extract of the malt.

Question 11

In the example provided, what is the malt extract percentage on a dry basis?

Answer 11

82% w/w

This percentage is used to calculate the kg of extract from the malt.

Question 12

What is the moisture content of the malt in the given example?

Answer 12

5% w/w

This moisture content affects the actual extract calculation.

Question 13

What is the task proposed regarding calculating the extract in 10,000 kg of malt?

Answer 13

Determine how much extract is present in 10,000 kg of the malt

A practical application of the concepts discussed.