Analytical

MEASURING PRINCIPLE

Optical analysis

Light emission, absorption or scattering is measured; luminescence quenching gives oxygen, scattered light gives turbidity.

PRINCIPLE · LIVE SIGNAL13.9mA

HOW IT WORKS

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Optical analysis

DISSOLVED OXYGEN
10.0 mg/L

OUTPUT
12.0 mA

ADJUST DISSOLVED OXYGEN

A blue LED excites a luminescent layer on the sensor cap.
The layer emits red light, and oxygen shortens (quenches) the decay time.
The sensor measures the decay time and converts it to oxygen concentration.

AT A GLANCE

Strengths and limits

STRENGTHS

Low drift, low maintenance, no electrolyte

LIMITS

Optical windows need keeping clean

INSTRUMENTS

Instruments using this principle

AN-310

Analytical

Optical Dissolved Oxygen Sensor

Luminescence sensing with low drift and no electrolyte.

ACCURACY

±0.1 mg/L

PROTECTION

IP68

AN-410

Analytical

Turbidity Sensor

Nephelometric sensing for filter and effluent monitoring.

ACCURACY

±2 % of reading

PROTECTION

IP68

APPLICATIONS

Where this principle is the answer

APPLICATION

Dissolved oxygen in aeration basins

Aeration is the largest energy cost in treatment; DO control cuts it.

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APPLICATION

Turbidity and filter monitoring

Catch filter breakthrough early and document compliance continuously.

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