What are pH and free chlorine measured for?

pH value and free chlorine are the two most important parameters for monitoring swimming and bathing pool water. The pH value directly influences the disinfection effect of chlorine: The effectiveness of chlorine is highest at an optimum pH value (7.0-7.4).

This practical combination test set enables the simultaneous determination of both parameters and is therefore the ideal tool for daily swimming pool monitoring.

Standard values for swimming pool water: pH 7.0-7.4, free chlorine 0.3-0.6 mg/l (DIN 19643).

How does the test set work?

The combination test set contains two separate measuring systems:
pH measurement: After adding phenol red Reagent, the sample changes color from yellow (acidic) to orange to red (basic) depending on the pH value.
Chlorine measurement: After adding the DPD reagents (chlorine A + B), the sample turns pink to violet in proportion to the chlorine concentration.

Advantages of the CALDUR® test set

• Two parameters in one test set

  Measure pH and free chlorine simultaneously – time-saving and practical

• Quick analysis in just 1 minute

  Ideal for daily swimming pool checks

• 50 determinations per parameter

  Economical for regular checks

• pH range 6.8 – 8.0

  Optimized for the swimming pool area

• Chlorine range 0.1 – 1.0 mg/l

  Covers the recommended range for swimming pool water

Der Beitrag CALDUR® pH / chlorine (free) – Colorimetric erschien zuerst auf RLS Wacon analytics.

What is chlorine measured for?

Chlorine is the most commonly used disinfectant in the world for treating drinking water and swimming pool water. It reliably kills bacteria, viruses and other pathogens, thus ensuring hygienically safe water. In chlorination, a distinction is made between free chlorine and combined chlorine (chloramines), the sum of which is referred to as total chlorine.

Free chlorine is the active, disinfecting form and should be between 0.1 and 0.3 mg/l in drinking water. Combined chlorine is produced by the reaction of free chlorine with nitrogen-containing compounds (e.g. urea, ammonia) and has a significantly lower disinfecting effect. In swimming pools, combined chlorine is responsible for the typical “chlorine smell” and eye irritation.

Limit values according to the Drinking Water Ordinance:
– Free chlorine: max. 0.3 mg/l Cl₂
– Combined chlorine: max. 0.1 mg/l Cl₂

Regular measurement of both forms of chlorine is essential for effective disinfection while minimizing by-products. The CALDUR® Chlorine LR Test Set – Photometric enables the precise determination of free and combined chlorine with the WINLAB Data Line photometer.

How does the test set work?

The CALDUR® Chlorine LR Test Set – Photometric is based on the proven DPD method (N,N-diethyl-p-phenylenediamine). DPD reacts with free chlorine to form a pink-violet dye, the intensity of which is proportional to the chlorine concentration and is measured photometrically.

Measurement of free chlorine: After adding reagent A, a pink coloration develops immediately corresponding to the free chlorine content. The absorbance is measured photometrically.

Measurement of combined chlorine: After adding reagent C, the combined chlorine is also measured. The difference between total chlorine and free chlorine gives the combined chlorine content.

The photometric evaluation with the WINLAB Data Line photometer provides objective, highly precise measurement results. The DPD method is internationally recognized and complies with the DIN EN ISO 7393-2 standards and WHO recommendations.

Advantages of the CALDUR® test set

• Quick analysis in just 1 minute

  Immediate results for free chlorine – ideal for daily routine checks

• Separate determination of free and combined chlorine

  Differentiated assessment of water quality and disinfection efficiency

• Low measuring range 0.05 – 1.0 mg/l Cl₂

  Perfect for drinking water monitoring and monitoring limit values

• 150 provisions per set – economical in continuous use

  Cost-efficient for daily checks in waterworks and industry

• Photometric precision measurement

  Objective measurement results with high resolution – independent of subjective color assessment

• DPD method according to international standards

  Standard-compliant according to DIN EN ISO 7393-2 – globally recognized reference method

Der Beitrag CALDUR® Chlorine LR (free + combined) – Photometric erschien zuerst auf RLS Wacon analytics.

What is chlorine measured for?

Chlorine is the most commonly used disinfectant in the world for treating drinking water and swimming pool water. It reliably kills bacteria, viruses and other pathogens, thus ensuring hygienically safe water. In chlorination, a distinction is made between free chlorine and combined chlorine (chloramines), the sum of which is referred to as total chlorine.

Free chlorine is the active, disinfecting form and should be between 0.1 and 0.3 mg/l in drinking water. Combined chlorine is produced by the reaction of free chlorine with nitrogen-containing compounds (e.g. urea, ammonia) and has a significantly lower disinfecting effect. In swimming pools, combined chlorine is responsible for the typical “chlorine smell” and eye irritation.

Limit values according to the Drinking Water Ordinance:
– Free chlorine: max. 0.3 mg/l Cl₂
– Combined chlorine: max. 0.1 mg/l Cl₂

Regular measurement of both forms of chlorine is essential for effective disinfection while minimizing by-products. The CALDUR® Chlorine LR test set enables the separate determination of free and combined chlorine in the low concentration range.

How does the test set work?

The CALDUR® Chlorine LR test set is based on the proven DPD method (N,N-diethyl-p-phenylenediamine). DPD reacts with free chlorine to form a pink-violet dye, the intensity of which is proportional to the chlorine concentration.

Measurement of free chlorine: After the addition of reagent A, a pink coloration corresponding to the free chlorine content develops immediately.

Measurement of combined chlorine: After adding reagent C, the combined chlorine is also measured. The difference between total chlorine and free chlorine gives the combined chlorine content.

The measured value is determined by direct color comparison with a color chart provided. The DPD method is internationally recognized and complies with the DIN EN ISO 7393-2 standards and the recommendations of the WHO.

Advantages of the CALDUR® test set

• Quick analysis in just 1 minute

  Immediate results for free chlorine – ideal for daily routine checks

• Separate determination of free and combined chlorine

  Differentiated assessment of water quality and disinfection efficiency

• Low measuring range 0.05 – 1.0 mg/l Cl₂

  Perfect for drinking water monitoring and monitoring limit values

• 150 provisions per set – economical in continuous use

  Cost-efficient for daily checks in waterworks and industry

• DPD method according to international standards

  Standard-compliant according to DIN EN ISO 7393-2 – globally recognized reference method

• Robust, waterproof plastic housing with hinged lid

  Safe transportation and protection of reagents – durable and reliable

Der Beitrag CALDUR® Chlorine LR (free + combined) – Colorimetric erschien zuerst auf RLS Wacon analytics.

What is chlorine measured for in the High Range?

The CALDUR® Chlorine HR (High Range) test set is specially designed for applications where higher chlorine concentrations occur and precise photometric measurement is required. This is typically the case for shock chlorination in swimming pools, industrial disinfection processes, cooling water treatment or the treatment of heavily contaminated water. In these situations, the measuring range of standard chlorine tests is often not sufficient, which is why an extended measuring range of 1 to 10 mg/l Cl₂ is required.

Chlorine is the most commonly used disinfectant in the world for treating drinking water and swimming pool water. It reliably kills bacteria, viruses and other pathogens, thus ensuring hygienically safe water. In chlorination, a distinction is made between free chlorine and combined chlorine (chloramines), the sum of which is referred to as total chlorine.

Free chlorine is the active, disinfecting form and should be present in different concentrations depending on the application. Combined chlorine is produced by the reaction of free chlorine with nitrogen-containing compounds (e.g. urea, ammonia) and has a significantly lower disinfecting effect. In swimming pools, combined chlorine is responsible for the typical “chlorine smell” and eye irritation.

Typical applications for the high range:
– Shock chlorination in swimming pools (up to 10 mg/l)
– Industrial cooling water treatment
– Disinfection of waste water
– Treatment of well water with high microbial contamination
– Food industry (cleaning and disinfection)
– Laboratory analyses with the highest accuracy requirements

Regular measurement of both forms of chlorine is essential for effective disinfection while minimizing by-products. The CALDUR® Chlorine HR Test Set – Photometric enables the separate determination of free and combined chlorine in the extended concentration range with maximum precision by photometric evaluation.

How does the test set work?

The CALDUR® Chlorine HR Test Set – Photometric is based on the proven DPD method (N,N-diethyl-p-phenylenediamine). DPD reacts with free chlorine to form a pink-violet dye, the intensity of which is proportional to the chlorine concentration.

Measurement of free chlorine: After the addition of reagent A, a pink coloration corresponding to the free chlorine content develops immediately.

Measurement of combined chlorine: After adding reagent C, the combined chlorine is also measured. The difference between total chlorine and free chlorine gives the combined chlorine content.

The evaluation is carried out photometrically with the WINLAB Data Line photometer, which enables a much more accurate determination of the chlorine concentration than the visual color comparison. The DPD method is internationally recognized and complies with the standards DIN EN ISO 7393-2 and the recommendations of the WHO.

Advantages of the CALDUR® test set

• Quick analysis in just 1 minute

  Immediate results for free chlorine – ideal for daily routine checks

• Highest precision through photometric evaluation

  Objective measured values without subjective color interpretation – ideal for documentation and quality assurance

• Separate determination of free and combined chlorine

  Differentiated assessment of water quality and disinfection efficiency

• Extended measuring range 1 – 10 mg/l Cl₂

  Perfect for shock chlorination, industrial applications and higher concentrations

• 150 provisions per set – economical in continuous use

  Cost-effective for regular checks in swimming pools and industry

• DPD method according to international standards

  Standard-compliant according to DIN EN ISO 7393-2 – globally recognized reference method

Der Beitrag CALDUR® Chlorine HR (free + combined) – Photometric erschien zuerst auf RLS Wacon analytics.

What is chlorine measured for in the High Range?

The CALDUR® Chlorine HR (High Range) test set is specially designed for applications where higher chlorine concentrations occur. This is typically the case with shock chlorination in swimming pools, industrial disinfection processes, cooling water treatment or the treatment of heavily contaminated water. In these situations, the measuring range of standard chlorine tests is often not sufficient, which is why an extended measuring range of 1 to 10 mg/l Cl₂ is required.

Chlorine is the most commonly used disinfectant in the world for treating drinking water and swimming pool water. It reliably kills bacteria, viruses and other pathogens, thus ensuring hygienically safe water. In chlorination, a distinction is made between free chlorine and combined chlorine (chloramines), the sum of which is referred to as total chlorine.

Free chlorine is the active, disinfecting form and should be present in different concentrations depending on the application. Combined chlorine is produced by the reaction of free chlorine with nitrogen-containing compounds (e.g. urea, ammonia) and has a significantly lower disinfecting effect. In swimming pools, combined chlorine is responsible for the typical “chlorine smell” and eye irritation.

Typical applications for the high range:
– Shock chlorination in swimming pools (up to 10 mg/l)
– Industrial cooling water treatment
– Disinfection of waste water
– Treatment of well water with high microbial contamination
– Food industry (cleaning and disinfection)

Regular measurement of both forms of chlorine is essential for effective disinfection while minimizing by-products. The CALDUR® Chlorine HR test set enables the separate determination of free and combined chlorine in the extended concentration range.

How does the test set work?

The CALDUR® Chlorine HR test set is based on the proven DPD method (N,N-diethyl-p-phenylenediamine). DPD reacts with free chlorine to form a pink-violet dye, the intensity of which is proportional to the chlorine concentration.

Measurement of free chlorine: After the addition of reagent A, a pink coloration corresponding to the free chlorine content develops immediately.

Measurement of combined chlorine: After adding reagent C, the combined chlorine is also measured. The difference between total chlorine and free chlorine gives the combined chlorine content.

The measured value is determined by direct color comparison with a color chart provided. The DPD method is internationally recognized and complies with the DIN EN ISO 7393-2 standards and the recommendations of the WHO.

Advantages of the CALDUR® test set

• Quick analysis in just 1 minute

  Immediate results for free chlorine – ideal for daily routine checks

• Separate determination of free and combined chlorine

  Differentiated assessment of water quality and disinfection efficiency

• Extended measuring range 1 – 10 mg/l Cl₂

  Perfect for shock chlorination, industrial applications and higher concentrations

• 150 provisions per set – economical in continuous use

  Cost-effective for regular checks in swimming pools and industry

• DPD method according to international standards

  Standard-compliant according to DIN EN ISO 7393-2 – globally recognized reference method

• Robust, waterproof plastic housing with hinged lid

  Safe transportation and protection of reagents – durable and reliable

Der Beitrag CALDUR® Chlorine HR (free + combined) – Colorimetric erschien zuerst auf RLS Wacon analytics.

What is free chlorine measured for?

Free chlorine is the most commonly used disinfectant in the world for treating drinking water and swimming pool water. It reliably kills bacteria, viruses and other pathogens, thus ensuring hygienically safe water. In chlorination, free chlorine is the active, disinfecting form that is responsible for effective water disinfection.

Free chlorine in drinking water should be between 0.1 and 0.3 mg/l to ensure a sufficient disinfection effect. Higher concentrations are recommended in swimming pools, depending on use. Regular monitoring of the free chlorine content is essential for ensuring water quality and protecting health.

Limit values according to the Drinking Water Ordinance:
– Free chlorine: max. 0.3 mg/l Cl₂

Regular measurement of free chlorine is essential for effective disinfection. The CALDUR® Chlorine (free) Test Set – Photometric enables the precise determination of free chlorine with the WINLAB Data Line photometer for maximum measurement accuracy.

How does the test set work?

The CALDUR® Chlorine (free) test set is based on the proven DPD method (N,N-diethyl-p-phenylenediamine). DPD reacts specifically with free chlorine to form a pink-violet dye, the intensity of which is proportional to the chlorine concentration.

Measurement of free chlorine: After adding the reagents, a pink coloration corresponding to the free chlorine content develops immediately. The evaluation is carried out photometrically with the WINLAB Data Line photometer for objective and reproducible measurement results.

The DPD method is internationally recognized and complies with the DIN EN ISO 7393-2 standards and WHO recommendations. The photometric evaluation allows you to achieve maximum precision and documentable measurement results – ideal for professional applications in the laboratory and in industry.

Advantages of the CALDUR® test set

• Quick analysis in just 1 minute

  Immediate results for free chlorine – ideal for daily routine checks

• Photometric measurement for maximum precision

  Objective and reproducible measurement results with the WINLAB Data Line Photometer

• Low measuring range 0.05 – 1.0 mg/l Cl₂

  Perfect for drinking water monitoring and monitoring limit values

• 150 provisions per set – economical in continuous use

  Cost-efficient for daily checks in waterworks, swimming pools and industry

• DPD method according to international standards

  Standard-compliant according to DIN EN ISO 7393-2 – globally recognized reference method

• Compact packaging in a plastic bag

  Space-saving and ideal for use with existing equipment

Der Beitrag CALDUR® Chlorine (free) – Photometric erschien zuerst auf RLS Wacon analytics.

What is free chlorine measured for?

Free chlorine is the most commonly used disinfectant in the world for treating drinking water and swimming pool water. It reliably kills bacteria, viruses and other pathogens, thus ensuring hygienically safe water. In chlorination, free chlorine is the active, disinfecting form that is responsible for effective water disinfection.

Free chlorine in drinking water should be between 0.1 and 0.3 mg/l to ensure a sufficient disinfection effect. Higher concentrations are recommended in swimming pools, depending on use. Regular monitoring of the free chlorine content is essential for ensuring water quality and protecting health.

Limit values according to the Drinking Water Ordinance:
– Free chlorine: max. 0.3 mg/l Cl₂

Regular measurement of free chlorine is essential for effective disinfection. The CALDUR® Chlorine (free) test set enables the quick and precise determination of free chlorine in the low concentration range – ideal for daily routine checks in waterworks, swimming pools and industry.

How does the test set work?

The CALDUR® Chlorine (free) test set is based on the proven DPD method (N,N-diethyl-p-phenylenediamine). DPD reacts specifically with free chlorine to form a pink-violet dye, the intensity of which is proportional to the chlorine concentration.

Measurement of free chlorine: After adding the reagents, a pink coloration corresponding to the free chlorine content develops immediately. The measured value is determined by direct color comparison with a 6-stage color chart provided.

The DPD method is internationally recognized and complies with the DIN EN ISO 7393-2 standards and WHO recommendations. The colorimetric evaluation allows you to obtain precise measurement results quickly and without additional devices.

Advantages of the CALDUR® test set

• Quick analysis in just 1 minute

  Immediate results for free chlorine – ideal for daily routine checks on site

• Simple determination of free chlorine

  Fast and uncomplicated measurement of the active disinfection component

• Low measuring range 0.05 – 1.0 mg/l Cl₂

  Perfect for drinking water monitoring and monitoring limit values

• 150 provisions per set – economical in continuous use

  Cost-efficient for daily checks in waterworks, swimming pools and industry

• DPD method according to international standards

  Standard-compliant according to DIN EN ISO 7393-2 – globally recognized reference method

• Robust, waterproof plastic housing with hinged lid

  Safe transportation and protection of reagents – durable and reliable

Der Beitrag CALDUR® Chlorine (free) – Colorimetric erschien zuerst auf RLS Wacon analytics.