How to Use a Calibration Column for Metering Pumps: Benefits, DIY Guide, and Top Brands

When it comes to chemical dosing accuracy, your metering pump is only as reliable as its calibration. A calibration column—sometimes called a calibration cylinder—is a simple, cost-effective tool that ensures your pump delivers the exact amount of chemical you intend.

At Cannon Water Technology, we supply premium calibration columns from trusted brands like Koflo, Pulsafeeder, and Neptune Pump Company. In this guide, we’ll explain the benefits, features, and step-by-step DIY use of calibration columns so you can maximize pump performance.

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What is a Calibration Column for a Metering Pump?

A calibration column is a transparent, graduated tube installed on the suction side of a metering pump. By measuring the actual chemical drawn into the pump over a set time, operators can verify if the pump is feeding the correct volume.

In short: it’s the easiest way to test and fine-tune chemical feed rates.

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Why Calibration Columns Are Essential

1. Improve Accuracy in Chemical Dosing

Calibration columns verify that your Pulsafeeder or Neptune pump is delivering the right volume—critical in water treatment, boilers, cooling towers, and industrial applications.

2. Save Money on Chemicals

Overdosing wastes expensive chemicals, while underdosing risks system damage. A calibration column keeps feed rates on target.

3. Simplify Troubleshooting

If your system performance is off, a calibration check instantly reveals whether the pump or another component is the problem.

4. Support Compliance and Reporting

Many industries require documented feed accuracy. Calibration provides a quick, verifiable record.

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Features of a High-Quality Calibration Column

When shopping for calibration columns, look for these features:

• Clear, Durable Construction – Koflo calibration columns are available in acrylic or PVC for excellent chemical resistance and easy reading.

• Precise Graduations – Markings in milliliters and gallons make volume checks fast and accurate.

• Easy Installation – Designed for compatibility with major brands like Pulsafeeder and Neptune Pump Company metering pumps.

• Optional Venting & Pressure Relief – Improves safety and simplifies priming.

? Tip: Choosing a brand-name calibration column ensures long-lasting accuracy and compatibility with your pump.

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DIY: How to Use a Calibration Column (Step-by-Step Guide)

Here’s a simple DIY method to check your pump’s calibration:

Step 1 – Install the Column

Mount the calibration column vertically on the suction side of the pump using chemical-resistant tubing.

Step 2 – Prime the Pump

Fill the column with chemical and allow the pump to remove any trapped air.

Step 3 – Time the Draw

Using a stopwatch, measure how long it takes for the pump to draw a set amount (e.g., 100 mL).

Step 4 – Calculate Flow Rate

$$Flow Rate (mL/min) = Volume Withdrawn ÷ Time (minutes)$$

Compare this value to the pump’s expected feed rate.

Step 5 – Adjust the Pump

Change the pump’s stroke length or speed until the measured rate matches the required dose.

Step 6 – Re-Test for Accuracy

Repeat the process two or three times and log the results for compliance records.

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Example Applications

• Water Treatment Plants – Use a Neptune calibration column to verify chlorine or coagulant feed.

• Boiler & Cooling Systems – Pair a Pulsafeeder calibration column with scale inhibitor dosing.

• Industrial Chemical Processes – Use a Koflo calibration cylinder for polymer feed accuracy.

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Shop Calibration Columns from:

• FloMotion Systems Calibration Columns
• Griffco Calibration Columns
• SIGMAMOTOR Calibration Columns
• Koflo Calibration Columns
• Pulsafeeder Calibration Columns
• Neptune Calibration Columns
• Icon Process Controls Calibration Columns

At Cannon Water Technology, we carry a full line of calibration columns and accessories compatible with Pulsafeeder, Neptune Pump Company, and Koflo products.

 Browse our calibration columns now and take control of your chemical dosing accuracy.

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❓ Frequently Asked Questions About Calibration Columns

1. What is a calibration column for a metering pump?

A calibration column is a clear, graduated cylinder installed on the suction side of a metering pump. It allows you to measure the actual volume of chemical drawn over a timed interval. This makes it easy to verify and adjust your pump’s chemical feed rate for maximum accuracy.

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2. Why should I use a calibration column?

Calibration columns help ensure chemical dosing accuracy, prevent overdosing or underdosing, save on chemical costs, and support regulatory compliance. They’re also a simple DIY tool for troubleshooting Pulsafeeder and Neptune pump performance.

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3. Which brands make calibration columns?

Trusted brands include Koflo, Pulsafeeder, and Neptune Pump Company. Koflo calibration columns are known for durable acrylic and PVC designs, while Pulsafeeder and Neptune offer columns specifically engineered for compatibility with their metering pumps.

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4. How do I use a calibration column with my metering pump?

To use a calibration column:

1. Install it on the suction side of the pump.

2. Prime the pump to remove air.

3. Record the time it takes to draw a set volume.

4. Calculate flow rate and compare with your pump settings.

5. Adjust stroke length or speed as needed.

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5. Are calibration columns universal?

Most calibration columns are designed for universal compatibility with standard metering pumps. However, it’s best to choose one designed for your pump brand—such as a Pulsafeeder calibration column or Neptune calibration column—to ensure proper fit and performance.

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6. Can I install a calibration column myself?

Yes! Installation is straightforward and considered a DIY-friendly task. With chemical-resistant tubing and fittings, you can mount a calibration column vertically on the pump suction line. Always follow safety guidelines when working with treatment chemicals.

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7. Where can I buy calibration columns?

You can purchase Koflo, Pulsafeeder, and Neptune Pump Company calibration columns directly from Cannon Water Technology. We carry a wide selection of sizes and materials to fit your specific application.

Final Thoughts

A calibration column is one of the most valuable DIY tools for ensuring metering pump performance. Whether you operate a Pulsafeeder pump in a cooling tower, a Neptune pump in a water treatment plant, or use a Koflo calibration column for industrial dosing, regular calibration checks protect your equipment, budget, and compliance records.

Get your calibration column today from Cannon Water and make chemical feed accuracy simple.