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SENSOR PREPARATION & INSTALLATION
5. SENSOR PREPARATION & INSTALLATION
5.1. SENSOR TYPES & DESCRIPTIONS
1. 2. 3.
1. HI7698194-0 combination pH sensor features a plastic body pH sensor with a glass
bulb and a silver/silver chloride double junction reference with gelled electrolyte.
HI7698194-1 combination pH / ORP sensor features a plastic body pH sensor with a glass bulb,
a platinum sensor for redox measurements and a silver/silver chloride double junction reference
with gelled KCl electrolyte.
2. HI7698194-3 four electrode conductivity (EC / TDS / Resistivity / Salinity) sensor, immune to
polarization or surface coatings.
3. HI7698494-5 optical dissolved oxygen (opdo
®
) sensor is based on the principle of fluorescence
quenching. An immobilized Pt based luminophore is excited by the light of a blue LED and emits
a red light. As oxygen interacts with the luminophore it reduces the intensity and lifetime of the
luminescence. The lifetime of the luminescence is measured by a photodetector and is used to
calculate the dissolved oxygen concentration.
Smart Cap Description
Easy to use Smart Caps contain pre-loaded calibration coefficients that are automatically transmitted
to the probe. The Smart Cap stores data in a RFID tag. If caps are switched between probes, no
information will be lost. See section 5.2. SENSOR PREPARATION & CONDITIONING for Smart Cap
installation procedure.
The Smart Cap™ is locked in place on the optical probe and includes the immobilized O
2
sensitive
luminophore with rugged insoluble black oxygen permeable protective layer.
Over time, the sensor’s optical components can age but are compensated for by using the reference
signal to compensate the measuring path. As a result, the sensor provides accurate DO measurements
over long periods of time without the need for frequent calibration.
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