What is the PM value measured for?

The PM value (p-value and m-value) describes the acid and base capacity of water and is a central parameter in boiler water and cooling water monitoring.

The p-value (phenolphthalein value) indicates the base capacity up to pH 8.2 and shows the concentration of hydroxide and carbonate ions. It is particularly important for monitoring alkalinity in boiler water and cooling water systems.

The m-value (methyl orange value) indicates the total alkalinity up to pH 4.3 and also includes the hydrogen carbonate ions. It is a measure of the total acid capacity of the water.

Regular monitoring of the PM value is essential for the safe operation of steam boiler systems, cooling water systems and water treatment systems. Incorrect alkalinity values can lead to corrosion, boiler scale or foaming.

How does the test set work?

The CALDUR® PM value test set works according to the proven acid-base titration method. The water sample is first mixed with a pre-reagent and an m-reagent (Reagent). The titration solution is then added drop by drop until a clear color change indicates the end point.

Measuring principle: Each drop of titration solution corresponds to 0.5 mmol/l (for standard sample volume) or 0.25 mmol/l (for double sample volume). The number of drops multiplied by the drop value results directly in the PM value.

Calculation: Number of drops × 0.5 (0.25) mmol/l = PM value.

Advantages of the CALDUR® test set

• p-value and m-value in one test set

  Comprehensive alkalinity determination with one test kit

• Measured value 0.5 (0.25) mmol/l per drop

  Precise measurement for system monitoring

• 100 provisions per set

  Economical for regular operational control

• 3 reagents for maximum accuracy

  m reagent, pre-reagent and titration solution

• Proven acid-base titration

  Reliable and reproducible results

Der Beitrag Caldur® PM value – Titrimetric erschien zuerst auf RLS Wacon analytics.

What is the PM value measured for?

The PM value (p-value and m-value) describes the acid and base capacity of water and is a central parameter in boiler water and cooling water monitoring.

The p-value (phenolphthalein value) indicates the base capacity up to pH 8.2 and shows the concentration of hydroxide and carbonate ions. It is particularly important for monitoring alkalinity in boiler water and cooling water systems.

The m-value (methyl orange value) indicates the total alkalinity up to pH 4.3 and also includes the hydrogen carbonate ions. It is a measure of the total acid capacity of the water.

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® PM-Wert Scientific test set uses a precise dosing syringe for titration. The water sample is mixed with the reagents, then the titration solution is added with the syringe. The measured value is read directly from the syringe scale – no drop counting required!

The measuring range covers 0-20 mmol/l for the p-value and m-value. The stepless reading enables a significantly higher precision than conventional drop titrations.

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

• Measuring range 0-20 mmol/l

  Covers the entire field of practical relevance

• Approx. 100 provisions per set

  Particularly economical due to high number of possible measurements

• p-value and m-value can be determined

  Comprehensive alkalinity determination with one test kit

Der Beitrag Caldur® PM value – Scientific erschien zuerst auf RLS Wacon analytics.