Hanna Total Chlorine Checker® HC

The Hanna Total Chlorine Checker® bridges the gap between simple chemical test kits and professional instrumentation.

Chemical test kits have limited accuracy and resolution since they rely upon the human eye to discern differences in color. Professional instrumentation incorporates a light source such as an LED or tungsten lamp with a filter and a light sensing detector to precisely determine ion concentration. Professional instrumentation offers greater resolution and accuracy but can cost hundreds of dollars. The Hanna Total Chlorine Checker® uses a fixed wavelength LED and silicon photo detector to provide the accuracy of professional instrumentation at the affordable price of a chemical test kit.

• Compact, Portable Design
• Built-in Timer
• One-Button Operation

The HI711 Checker® HC (Handheld Colorimeter) provides a simple, accurate and cost effective way to measure total chlorine. Chlorine is a popular disinfectant used in municipal water, fruits and vegetables, as well as equipment in the food and beverage industry. Though beneficial in destroying pathogens, levels greater than 4 parts per million (ppm) is harmful to humans and therefore, must be monitored. Designed as a more accurate alternative to chemical test kits, the HI711 provides quick, accurate results in four easy steps:

Features at-a-glance:

• Easier to use and more accurate than chemical test kits
• Dedicated to a single parameter
• Small size, big convenience
• Ideal for: Water Quality, Education, Pool and Spa

Q&A

What is the Hanna Total Chlorine Checker HC used for?

The Hanna Checker HC is a portable handheld colorimeter designed to measure chlorine levels in water. It provides quick digital readings of chlorine concentration, helping users monitor water quality in applications such as drinking water testing, swimming pools, aquariums, environmental monitoring, and water treatment processes. 

What does total chlorine mean?

Total chlorine represents the sum of free chlorine and combined chlorine present in water. Free chlorine is the active disinfectant available to kill microorganisms, while combined chlorine forms when chlorine reacts with organic matter or ammonia. Measuring total chlorine helps determine the overall level of chlorine-based disinfectants in the water. 

How does the Hanna Checker HC measure chlorine?

The instrument uses a colorimetric method based on the DPD reagent. When the reagent reacts with chlorine in the sample, the solution develops a pink color. The checker measures the intensity of this color using an LED light source and a photodetector, then converts the signal into a chlorine concentration reading.

What is the measurement range of the Hanna Checker HC?

The checker typically measures chlorine concentrations in the range of 0.00 to 2.50 ppm (mg/L), with a resolution of 0.01 ppm. This range is suitable for monitoring low levels of chlorine commonly found in drinking water, pools, and environmental samples.

How accurate is the Hanna chlorine checker?

The instrument provides an accuracy of approximately ±0.03 ppm ±3% of the reading at 25 °C. This level of precision makes it significantly more accurate than many traditional color-comparison test kits. 

What are the advantages of using a digital chlorine checker instead of test strips?

Digital checkers provide objective readings on an LCD screen instead of relying on visual color comparison. This reduces interpretation errors and improves repeatability, making them more reliable for routine water quality monitoring. 

How is the Hanna Checker HC used?

Testing typically involves three simple steps: first, the instrument is zeroed using a water sample; next, a reagent packet is added to react with chlorine; and finally, the cuvette is placed in the meter and the result is displayed after pressing the measurement button.

What accessories are included with the Hanna chlorine checker?

The checker is usually supplied with two sample cuvettes with caps, a starter kit of chlorine reagents for several tests, a battery, and an instruction guide. Additional reagent sets can be purchased separately for continued testing.