HI7640-18 Galvanic Dissolved Oxygen Industrial Smart Probe HI510 and HI520 Universal Process Controller compatible The HI7640-18 is a galvanic-style oxygen probe designed for use with the Hanna Instruments® HI510 or HI520 process controller. The system is suited for continuous measurement of oxygen dissolved in water. An integral temperature sensor measures water temperature and adjusts the probe signal over the specified temperature range. The result is reliable dissolved oxygen (DO) concentration or percent saturated measurements. Suitable for control applications in municipal and industrial wastewater treatment, the probe can be submersed/immersed using the 3/4” NPT threads, or installed directly in‑line or in a flow cell installation, using the lower sensor threads. The probe is available with an integral connector that permits connections after installation. Patch cables may be purchased separately to connect between the probe and controller up to 50 meters (164 ft). • Galvanic probe with digital processing • Simple membrane-cap replacement • Large electrolyte reservoir provides longer service life • Rugged, chemically-resistant PVDF body • Built-in temperature sensor for measurement and DO compensation • Digital probe stores model, firmware, serial number, and calibration information • 3/4” NPT external thread for mounting • 3 bar (43.5 psi) maximum pressure O-ring seal Membrane cap Oxygen permeable membrane Zinc anode element Silver cathode element The galvanic probe functions in the same manner as a battery. The sensing elements consist of silver cathode and zinc anode, with a pretensioned membrane isolating the cell from the liquid being measured. The refillable electrolyte reservoir holds ample electrolyte to support the reaction. Oxygen diffuses through the membrane and is reduced on the surface of the cathode. This reaction generates a signal proportional to the oxygen concentration. See compatible probe extension cables on page page 15.58, see addtional mounting accessories on page 15.33, see probe holders on page 15.138 and 15.134. 15 Process Instrumentation 15.68 | www.hannainst.com controllers
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