Question 1

What is pH and why is it important?

Accepted Answer

pH describes the acid-base character of an aqueous solution (scale 0–14). It directly influences chemical reactions, product quality, corrosion and biological processes — making it one of the most measured process variables.

Question 2

Which pH sensors are available for process use?

Accepted Answer

Potentiometric glass electrodes, ISFET sensors (semiconductor-based) and combined pH/ORP single-rod assemblies are common. For hygienic applications, aseptic versions per DIN 11864 are available.

Question 3

How often do pH sensors need calibration?

Accepted Answer

Typically every 2–4 weeks under normal conditions, more frequently in aggressive media or high GMP environments. MEMOSENS sensors allow pre-calibration in the lab and fast in-situ exchange.

Question 4

What is glass corrosion and how to prevent it?

Accepted Answer

At high pH (>12) or in HF-containing media, the glass membrane can be attacked. Special high-alkali glass, ISFET sensors or coated membranes are the remedy — depending on process conditions.

pH Measurement

Installation Types

Relevant Industries

Standards & Regulations

FAQ