Slide rule

SKU: S742
GTIN: 4009910000724
Category: CO² bottles

Slide rule
for CO²-containing beverages
for determining the equilibrium pressure in
Dependence on CO² volume, as well as for calculating the necessary CO² delivery pressure

4,88 €

incl. 19% VAT , plus

Choose tax zone / country of delivery

Delivery time: 2 - 3 Workdays (DE - int. shipments may differ)

A slide rule for CO2-containing beverages is a practical tool used to determine the equilibrium pressure and the necessary CO2 delivery pressure. This is particularly relevant in the beverage industry, where the correct amount of CO2 is required for carbonating beverages such as cola, lemonade, or beer. Here is a detailed explanation of how such a slide rule works and how it is used:

1. Equilibrium pressure as a function of CO2 volume:

The slide rule helps to calculate the equilibrium pressure required to dissolve CO2 in liquids and achieve the desired carbonation level. The equilibrium pressure is the pressure at which CO2 remains stable in a liquid at a certain temperature without gas escaping or dissolving further.

Volume percent CO2 (CO2 volume): This is the proportion of CO2 gas that is present in the beverage in dissolved form. For example, a beverage with 5 volume percent CO2 contains 5 parts CO2 per 100 parts liquid.
Temperature dependence: The slide rule also takes temperature into account, as the equilibrium pressure decreases at higher temperatures and increases at lower temperatures. This is important because the carbonation temperature of a beverage is often between 0 and 10 °C.

The scales of the slide rule are calibrated so that the user can read the corresponding equilibrium pressure by setting the CO2 volume and temperature.

2. Calculation of the required CO2 delivery pressure:

The CO2 delivery pressure is the pressure required to deliver CO2 from a tank into the beverage, ensuring that the CO2 is completely dissolved in the liquid. The slide rule also helps to determine the correct delivery pressure here.

Delivery pressure: The delivery pressure must be high enough to force the CO2 into the liquid without allowing the CO2 to escape from the solution. At the same time, the pressure must not be so high that the beverage becomes overcarbonated.
Relationship between delivery pressure and equilibrium pressure: The slide rule establishes a connection between the equilibrium pressure and the delivery pressure. The delivery pressure should usually be slightly higher than the equilibrium pressure to ensure that the CO2 passes into the liquid.

3. Practical application:

Calculation and verification: The slide rule is used in practice to ensure that the carbonation of the beverage is set to the desired level and that the CO2 delivery pressure is sufficient to efficiently dissolve the gas into the beverage. It also helps to avoid errors caused by pressures that are too low or too high.
Adjustments depending on the beverage: Depending on the type of beverage (e.g., cola, lemonade, beer), the slide rule can be used to calculate the specific CO2 content and the corresponding pressure. For carbonated beverages, there are often specific CO2 volume percentages that are targeted to achieve the right taste and carbonation.

4. Advantages of the slide rule:

Precision: The slide rule enables quick and precise calculation of equilibrium pressure and delivery pressure.
Easy to use: The slide rule is a practical, easy-to-understand tool that requires no electricity or software and can be used directly on the production line or in the brewery.
Production optimization: Accurate calculation of CO2 content and delivery pressure ensures uniform carbonation, which improves beverage quality and production efficiency.