Agilent Flow Calculator

To calculate the flow rate using the Agilent Flow Calculator, plug in the column diameter and linear velocity into the formula. Solve for the flow rate by following the equation.

Agilent Flow Calculator

Enter any 2 values to calculate the missing variable

Column Diameter

mm cm m in ft

Linear Velocity

cm/min m/min in/min ft/min

Flow Rate

mL/min L/min fl oz/min gal/min

Calculate Reset

The Agilent Flow Calculator is a useful tool for calculating the flow rate in gas chromatography (GC) columns and other laboratory applications. It helps ensure accurate flow rates, which are crucial for precise measurements and results in chromatography. This calculation becomes essential in ensuring consistency across different methods and systems, particularly when transferring methods between instruments.

Formula:

The formula used to calculate flow rate is:

$$FR = \frac{\pi \cdot (CD/10)^2}{4} \cdot LV$$

Where:

• FR = Flow rate
• CD = Column diameter (in mm)
• LV = Linear velocity (in cm/sec)

How to Calculate ?

1. Measure the column diameter in millimeters and the linear velocity in cm/sec.
2. Plug these values into the formula to calculate the flow rate.
3. Calculate the flow rate to ensure the appropriate settings for your GC column.

Solved Calculations

Example 1:

Given:

• Column diameter (CD) = 0.25 mm
• Linear velocity (LV) = 20 cm/sec

Variable	Value
Column diameter (CD)	0.25 mm
Linear velocity (LV)	20 cm/sec

$$FR = \frac{\pi \cdot (0.25/10)^2}{4} \cdot 20$$ $$FR = \frac{\pi \cdot (0.025)^2}{4} \cdot 20$$$$FR \approx 0.03927 \, \text{mL/min$$

Answer: The flow rate is approximately 0.03927 mL/min.

Example 2:

Given:

• Column diameter (CD) = 0.32 mm
• Linear velocity (LV) = 25 cm/sec

Variable	Value
Column diameter (CD)	0.32 mm
Linear velocity (LV)	25 cm/sec

$$FR = \frac{\pi \cdot (0.32/10)^2}{4} \cdot 25$$ $$FR = \frac{\pi \cdot (0.032)^2}{4} \cdot 25$$$$FR \approx 0.0643 \, \text{mL/min}$$

Answer: The flow rate is approximately 0.0643 mL/min.

What is Agilent Flow Calculator ?

The Agilent Flow Calculator is an essential tool for anyone working with chromatography, particularly in labs that utilize Agilent instruments.

This calculator helps determine the flow rate of various gases and liquids through columns, allowing for accurate and efficient method development. It can be especially useful when adjusting conditions for different types of chromatography, such as gas chromatography (GC) and high-performance liquid chromatography (HPLC).

Using the Agilent Flow Calculator, you can easily input parameters like pressure and solvent properties to calculate flow rates in different scenarios. This includes calculating the flow rate of the Agilent 1260 or 1290 systems and understanding how changes in pressure affect flow rates.

Moreover the tool aids in translating GC methods and evaluating solvent expansion, which is crucial for optimizing chromatography performance.

Final Words:

For those looking to improve their analytical methods, the Agilent Flow Calculator is a valuable resource that can be downloaded or accessed as a free app. Whether you’re assessing vapor volumes or managing flow rates in the lab, this calculator simplifies complex calculations and enhances efficiency in your workflows.