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HACH
LDO™ Probe allows for major advantages in
dissolved oxygen monitoring.
New
luminescence technology offers reduced maintenance,
while increasing accuracy, stability, and speed.
The
HACH LDO dissolved oxygen probe is a revolutionary breakthrough
in the measurement of dissolved oxygen (DO) in the wastewater
treatment plant process.  By applying completely
new technology to the measurement of DO, Hach has virtually
eliminated the numerous problems inherent to older DO
measurement technologies. The HACH LDO probe uses no anodes,
cathodes or electrolyte solutions, which suffer from high
failure rates and break down over time. The HACH LDO probe
has no membrane to clean or replace, no electrolyte solutions
to replenish and does not require frequent calibration.
The
HACH LDO probe can be used in many places throughout the
wastewater treatment plant, such as aeration basins, aerobic
and anaerobic digesters and nitrification and de-nitrification
tanks. The HACH LDO probe utilizes a sensor coated with
a luminescent material. Blue light from an LED is transmitted
to the sensor surface and excites the luminescent material,
which emits red light as it relaxes. The time from when
the blue light was sent to when the red light is emitted
is measured. The more oxygen that is present the shorter
the time it takes for the red light to be emitted. This
time is measured and correlated to the oxygen concentration.
The HACH LDO probe is simple to operate and offers users
reduced maintenance and infrequent calibration while increasing
the accuracy, stability and speed of DO measurement.
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