Carbonate Hardness (Alkalinity) – CALDUR® | RLS Wacon

Caldur® Carbonate hardness – Scientific

Stefano Russo — Thu, 12 Mar 2026 10:29:53 +0000

CALDUR® Carbonate Hardness Scientific Test Set – Syringe titration

What is carbonate hardness measured for?

Carbonate hardness (temporary hardness) is an important parameter in water chemistry and provides information about the concentration of hydrogen carbonate and carbonate ions in the water. It is part of the total hardness and plays a decisive role in the buffering capacity of the water (pH stability).

Monitoring carbonate hardness is essential in boiler systems, as carbonate hardness precipitates and forms scale when heated. This impairs heat transfer and can lead to serious damage to the system. The carbonate hardness in boiler water should be as low as possible (< 0.5 °dH). The Scientific series from CALDUR® offers maximum precision and user-friendliness thanks to the innovative syringe titration. Intermediate values can be read directly on the scale without having to count drops.

How does the test set work?

The CALDUR® Carbonate Hardness Scientific test set uses a precise dosing syringe for titration. Two reagents are added to the water sample, then the titration solution is added with the syringe. The measured value is read directly from the syringe scale – no drop counting required!

This method enables a continuous reading in the range from 0 to 20 °dH and offers significantly higher precision than conventional drop titrations. The resolution is at least 0.5 °dH, whereby intermediate values can also be read without any problems.

Advantages of the CALDUR® test set

Quick analysis in just 1 minute
Ideal for regular checks – faster than conventional drip titrations
Highest precision through syringe titration
Stepless reading enables intermediate values – no drop counting required
Wide measuring range from 0 to 20 °dH
Covers all practical areas from boiler water to raw water
Approx. 200 provisions per set – economical in continuous use
Particularly economical due to high number of possible measurements
Convenient handling with dosing syringe
Ergonomic design for fatigue-free working
Robust plastic housing
Safe transportation and protection of components

Der Beitrag Caldur® Carbonate hardness – Scientific erschien zuerst auf RLS Wacon analytics.

Caldur® Carbonate hardness CH 5 – Titration

Stefano Russo — Thu, 12 Mar 2026 10:29:52 +0000

CALDUR® Carbonate hardness CH 5 test set – Titration

What is carbonate hardness measured for?

Monitoring carbonate hardness is essential in boiler systems, as carbonate hardness precipitates and forms scale when heated. This impairs heat transfer and can lead to serious damage to the system. The carbonate hardness in boiler water should be as low as possible (< 0.5 °dH). For applications that require particularly high precision in the low hardness range, the CALDUR® CH 5 test set offers a resolution of 0.5 °dH or 0.25 °dH. This is ideal for checking softened water, boiler water and high-purity process water.

How does the test set work?

The CALDUR® carbonate hardness CH 5 test set works according to the proven acid-base titration method. The hydrogen carbonate is neutralized by adding an acid solution drop by drop to a water sample with Reagent. The color changes at the equivalence point – the number of drops used corresponds directly to the carbonate hardness.

The method is simple, fast and provides reliable results in the measuring range from 0 to 10 °dH with a resolution of 0.5 °dH (0.25 °dH with double the sample quantity).

Advantages of the CALDUR® test set

Quick analysis in just 1 minute
Ideal for daily checks in boiler systems and softening systems – immediate results
High resolution of 0.5 °dH (or 0.25 °dH)
Particularly precise measurement in the low hardness range
100 determinations at 5 °dH – economical in continuous use
Cost-efficient for regular inspections in waterworks and industrial plants
Simple drop titration without aids
No additional devices required – direct reading
Clear color change for precise results
Clearly recognizable end point of the titration
Robust, waterproof plastic housing with hinged lid
Safe transportation and protection of reagents

Der Beitrag Caldur® Carbonate hardness CH 5 – Titration erschien zuerst auf RLS Wacon analytics.

Caldur® Carbonate hardness CH – Titration

Stefano Russo — Thu, 12 Mar 2026 10:29:51 +0000

CALDUR® Carbonate hardness CH test set – Titration

What is carbonate hardness measured for?

Monitoring carbonate hardness is essential in boiler systems, as carbonate hardness precipitates and forms scale when heated. This impairs heat transfer and can lead to serious damage to the system. The carbonate hardness in boiler water should be as low as possible (< 0.5 °dH). In aquariums, carbonate hardness stabilizes the pH value and prevents dangerous pH fluctuations. A carbonate hardness of 3-10 °dH is optimal for most fish. Carbonate hardness also plays an important role for water quality in drinking water treatment and pool water.

How does the test set work?

The CALDUR® Carbonate hardness CH test set works according to the proven acid-base titration method. The hydrogen carbonate is neutralized by adding an acid solution drop by drop to a water sample with Reagent. The color changes at the equivalence point – the number of drops used corresponds directly to the carbonate hardness.

The method is simple, fast and provides reliable results in the measuring range from 0 to 20 °dH with a resolution of 1.0 °dH (0.5 °dH with half the sample quantity).

Advantages of the CALDUR® test set

Quick analysis in just 1 minute
Ideal for daily checks in boiler systems and aquariums – immediate results
Measuring range from 0 to 20 °dH with 1.0 °dH resolution
Covers all practice-relevant ranges, optional 0.5 °dH resolution possible
100 determinations at 10 °dH – economical in continuous use
Cost-efficient for regular inspections in waterworks and industrial plants
Simple drop titration without aids
No additional devices required – direct reading
Clear color change for precise results
Clearly recognizable end point of the titration
Robust packaging format
Choice between hinged lid box and folding box

Der Beitrag Caldur® Carbonate hardness CH – Titration erschien zuerst auf RLS Wacon analytics.