HI6421 and HI6421P are streamlined benchtop meters with a large touch screen display, comprised of a housing and an integrated module designed for fresh and saltwater measurements of dissolved oxygen. HI6421 includes Hanna's HI7641133 optical dissolved oxygen probe (opdo®) that is based on the principle of ¦uorescence 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. The probe is tted with easy to use Smart Caps (HI764113-1) which lock in place and contain pre-loaded calibration coe«cients that are automatically transmitted to the probe. The Smart Cap features an immobilized O¬ 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. HI6421P includes the HI764833 polarographic probe. Slim and versatile, this probe covers a wide dissolved oxygen range and has a built-in thermistor temperature sensor that compensates for temperature variations. The slim design allows for measurement in test tubes and Biological Oxygen Demand (BOD) bottles. Durable and robust, the probe features a platinum cathode and Ag/ AgCl anode assembly. Accurate and with a fast response time. The probe is tted with durable (PTFE), oxygen permeable, screw on membrane caps. Caps are lled with electrolyte and easily install on the probe. Concentration measurements are automatically compensated for barometric pressure, temperature, and salinity. Barometric pressure and temperature are automatically measured and compensated. Salinity is automatically compensated by setting manually the salinity concentration of the water being measured. Pressure compensation is done automatically (built-in barometer) or users have the option to manually enter required value. Pressure is displayed in user-congurable units: mmHg, mbar, kPa, inHg, psi, atm. HI6421 • HI6421P Advanced Dissolved Oxygen Meter with Optical and Polarographic Probe Compatibilty 6 Dissolved Oxygen 6.4 | www.hannainst.com benchtop
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