Optical Dissolved Oxygen Industrial Smart Probe

In stock

dedicated to the HI510 Universal Process Controller


The HI7640-58 series are optical dissolved oxygen probes with HI764113-1 DO Smart Caps for measurements of dissolved oxygen. These probes are designed to be paired with the Hanna Instruments HI510 Universal Process Controller. When paired with the controller, the system provides accurate DO measurements auto-compensated
for barometric pressure, salinity (manually set), and temperature. Suitable for control applications in municipal and industrial wastewater treatment, where optimizing oxygen transfer is a key element, the probe can be installed directly in-line, immersed in a tank, or in a flow cell installation.

Principle of Operation

The Smart Cap contains pre-loaded calibration coefficients that are automatically transmitted to the probe. The Cap stores data in a RFID tag. If caps are switched between probes, no information will be lost. The Smart Cap is locked in place on the optical probe and includes the immobilized O₂ 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.





0.00 to 50.00 mg/L (ppm) concentration 0.0 to 500.0 % saturation


0.01 mg/L (ppm) 0.1% saturation


±1.5% of reading ± 0.01 mg/L from 0.00 to 20.00 mg/L ±5% of reading from 20.00 to 50.00 mg/L ±1.5% of reading ± 0.1% from 0.0 to 200.0% sat. ±5% of reading from 200.0 to 500.0% sat.


One or two points at 100% and/or 0% or 8.26 mg/L and/ or 0 mg/L in water-saturated air or zero-oxygen solution Single point process calibration, using a value entered by the user in % saturation or mg/L


Range -5.0 to 50.0 °C (23.0 to 122.0 °F) Resolution 0.1 °C / 0.1 °F Accuracy ±0.3 °C / ±0.5 °F Calibration Single point offset in meter setting

Temperature compensation

Automatic, from -5.0 to 50.0 °C (23.0 to 122.0 °F)

Pressure compensation

% air saturation and mg/L (ppm) Automatic, from 420 to 850 mmHg

Salinity compensation

Automatic, from 0 to 70 g/L (set manually



Probe type

Optical DO

Sensor diameter

17 mm (0.7”)

Maximum pressure

2 bar (29 psi) at 25 °C (77 °F)

Threaded connection

3/4” NPT external thread (both ends)

Ingress Protection Rating


Wetted parts

Smart cap material – Polypropylene Dome-shaped membrane – PMMA O-ring – Nitrile (NBR) rubber Temperature contact – Stainless steel

Protection rating


Cable length

See zz, Series Configuration