Caldur® Residual hardness – Scientific
Determination of residual hardness in water by spray titration
Private customers can also find our range in our partner store Ampha-Analyse.
Reagent for Caldur® Residual hardness – Scientific:
See also:
CALDUR® Residual Hardness Scientific Test Set – Syringe titration
What is residual hardness measured for?
The residual hardness is the degree of hardness remaining after water treatment (e.g. softening, ion exchange). It is an important control parameter for the function of water softeners and water treatment systems.
This test set is available in three units:
- 0 – 2 °dH (German hardness) – standard in Germany
- 0 – 2 °fH (French hardness)
- 0 – 20 ppm CaCO₃ – International unit
The Scientific series from CALDUR® offers maximum precision for low hardness ranges thanks to innovative syringe titration. Intermediate values can be read directly from the scale.
How does the test set work?
The CALDUR® Residual 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 using the syringe. The measured value is read directly from the syringe scale – no drop counting required!
Advantages of the CALDUR® test set
- Quick analysis in just 1 minute
Ideal for regular checks of softening systems
- Highest precision through syringe titration
Stepless reading enables intermediate values – no drop counting required
- Three units available
°dH, °fH or ppm – choose the right unit for your application
- Approx. 200 provisions per set
Particularly economical due to high number of possible measurements
- Optimized for low hardness ranges
Specially designed for the control of treated water
Areas of application
Carrying out the measurement:
- Fill water sample into test tube
- Add reagent A (buffer) and mix
- Add reagent B (Reagent) – solution turns red
- Fill dosing syringe with titration solution
- Slowly add titration solution while swirling until the color changes to green
- Read the measured value directly from the syringe scale
Tip for best results
With very low residual hardness (< 0.5 °dH) particularly slowly in order to detect the exact color change point.
Measuring range
| Unit | Measuring range | Measuring resolution |
|---|---|---|
| °dH | 0 – 2 °dH | Stepless |
| °fH | 0 – 2 °fH | Stepless |
| ppm | 0 – 20 ppm | Stepless |
Number of possible provisions
You can carry out approx. 200 measurements with a CALDUR® Test Set Residual Hardness Scientific.
Specifications at a glance
| Property | Value |
|---|---|
| Parameters | Residual hardness (Ca²⁺ + Mg²⁺) |
| Method | Scientific (syringe titration) |
| Measuring range | 0 – 5 °dH / 0 – 8.9 °fH / 0 – 89 ppm |
| Analysis duration | 1 minute |
| Number of provisions | approx. 200 |
| Description: Syringe | Syringe, test tube, 2 reagents |
| Packaging | Plastic box |
Scope of delivery
| Dosing syringe | 60 ml with scale |
| Titration solution | 60 ml (shelf life 60M) |
| Indicator solution | 10 ml (shelf life 36M) |
| Test tubes | With markings |
| Operating instructions | DE/EN |
Additional information
| Einheit | °dH, °fH, ppm |
|---|
Flyer
Instructions for use
Operating instructions
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