Analytical

MEASURING PRINCIPLE

Electrochemical analysis

Ion-selective electrodes and conductivity cells convert chemical activity into potential or current.

PRINCIPLE · LIVE SIGNAL13.9mA

HOW IT WORKS

See the principle in action

Move the slider to change the process variable and watch the signal respond.

Electrochemical analysis

PH VALUE
7.00 pH

OUTPUT
12.0 mA

ADJUST PH VALUE

A glass membrane responds to hydrogen-ion activity.
The potential between measuring and reference electrodes follows the Nernst equation.
The analyser converts millivolts into pH, with temperature compensation.

AT A GLANCE

Strengths and limits

STRENGTHS

Proven for pH, ORP and conductivity

LIMITS

Sensors age and need periodic calibration

INSTRUMENTS

Instruments using this principle

AN-110

Analytical

pH / ORP Analyser

Digital pH sensor and transmitter with built-in diagnostics.

ACCURACY

±0.02 pH

PROTECTION

IP66

AN-210

Analytical

Conductivity Analyser

Inductive cell for aggressive and CIP media.

ACCURACY

±1 % of reading

PROTECTION

IP67

APPLICATIONS

Where this principle is the answer

APPLICATION

Wastewater pH dosing control

pH must be held in a narrow band while dosing chemicals, against fouling and flow changes.

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APPLICATION

Clean-in-place conductivity monitoring

Detect phase changes and rinse completion to cut water, chemical and downtime.

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Articles and downloads

Technical article

Selecting pH sensors for process control

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Application note

Optimising CIP with conductivity

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