Description

HI6421 is a streamlined benchtop meter 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 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.

The probe is fitted with easy to use Smart Caps (HI764113-1) which lock in place and contain pre-loaded calibration coefficients that are automatically transmitted to the probe. The Smart Cap features an 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. Concentration measured. Additional features include built-in methods and calculations for the measurement of BOD (Biological Oxygen Demand), OUR (Oxygen Uptake Rate), and SOUR (Specific Oxygen Update Rate). Pressure compensation is done automatically (built-in barometer) or users have the option to manually enter required value. Pressure is displayed in user-configurable units: mmHg, mbar, kPa, inHg, psi, atm.

Features at-a-glance

User interface

• 7-inch capacitive touch screen with multi-touch support
• Capacitive touch back, home and system menu keys
• User-friendly icons and symbols allow users to easily navigate and interpret the instrument functions

The user can select between five different views:

• Basic measurement configuration
• Simple GLP with calibration information
• Full GLP with electrode status and calibration point details
• Live updated, interactive graph
• Tabulated data with date, time, and notes

Measurement

• Measure %Sat, mg/L, ppm (DO); mg/L, ppm (BOD); mg/L (OUR); ppm, mg/L (SOUR)
• Application-specific profiles allow quick and direct measurement without the need to update the
  sensor and system settings
• Active log during measurement Measurement stability indicator (using the Stability Criteria setting)
• Reading modes: direct and direct/auto-hold
• Temperature compensation can be Automatic or set manually
• Audible and/or alarm messages for measurements outside of predefined limits
• Galvanic isolation for measurement

Calibration

• One or two points calibration at 0% and/or 100% saturation
• Single point manual calibration in mg/L or % saturation using a reference method
• Non-volatile memory saves data and settings

Logging

• Data log collection of at least 1, 000, 000 data points (with time and date stamp)
• Logging types: manual, automatic, auto-hold
• Sample ID for manual and auto-hold data

Connectivity features & services

• Transfer logged data ta USB thumb drive
• Log files that include measurements and calibration data (as .csv file)
• FTP and email for log export via Ethernet and Wi-Fi connection
• USB type A for USB stick, keyboard, and printer
• USB type C for USB stick and PC connection

Help section for meter guidance

• Video support presentation of main functionalities

Ordering Information:

HI6421 is supplied with HI7641133 optical dissolved oxygen probe (opdo®); HI764060 electrode holder; capillary pipette; 24 VDC power adapter; USB-C to USB-A cable; probe quality certificate; quick reference guide with instrument quality certificate.

Accessories:

HI7641133 optical dissolved oxygen probe (opdo®)
HI764113-1 Smart cap with O-ring
HI764113-2 Calibration/storage vessel
HI764113-3 Stainless steel protective shield