1
Function
The DULCOTEST
®
sensor, type DO 3, is used
for measurement of the partial pressure of dis‐
solved oxygen and the measured variables
derived from this:
n
Oxygen concentration in aqueous liquids
in mg/l or ppm,
n
Degree of oxygen saturation in aqueous
liquids in %
The sensor type DO 3 is used for measurement
of the concentration of dissolved oxygen in
fresh water and salt water. The applications
specifically include
n
The control and monitoring of aeration pro‐
cesses in clarification plants,
n
Monitoring of fish farming facilities
n
The aeration of raw water in water works
n
Assessment of the quality of surface
water.
All wetted materials are suitable for fresh water
and salt water.
1.1 Measuring principle
The sensor type DO 3 is based on the optical
measurement of a fluorescence beam. The flu‐
orescence beam is weakened depending on
the partial pressure of the oxygen in the water.
The measurement is done in pulsed mode, with
the relaxation time of the fluorescence beam
being determined.
Function
5
