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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 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-configurable units: mmHg, mbar, kPa, inHg, psi, atm.
User interface
- 7-inch capacitive touch screen with multi-touch support
- Capacitive touch back, home and system menu keys
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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
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Measure %Sat, mg/L, ppm (DO)
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Application-specific profiles allow quick and direct measurement without the need to update the sensor and system settings
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Active log during measurement
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Measurement stability indicator (using the Stability Criteria setting)
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Reading modes: direct and direct/autohold
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Temperature compensation can be Automatic or set manually
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Audible and/or alarm messages for measurements outside of predefined limits
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Galvanic isolation for measurement
Calibration
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One or two points calibration at 0% and/or 100% saturation
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Single point manual calibration in mg/L or % saturation using a reference method
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Non-volatile memory saves data and settings
Logging
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Data log collection of at least 1,000,000 data points (with time and date stamp)
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Logging types: manual, automatic, autohold
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Sample ID for manual and Autohold data
Connectivity features & services
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Transfer logged data to a USB thumb drive
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Log files that include measurements and calibration data (as .csv file)
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FTP and email for log export via Ethernet and Wi-Fi connection
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USB type A for USB stick, keyboard, and printer
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USB type C for USB stick and PC connection
Help section for meter guidance
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Video support presentation of main functionalities
Primary Applications:
- Fresh water and saltwater applications, aquaculture, aquariums, environmental.
Specifications:
|
DO (HI7641133 Optical probe)
|
Range |
0.00 to 50.00 mg/L (ppm) concentration; 0.0 to
500.0 % saturation
|
| Resolution | 0.01 mg/L (ppm); 0.1 % saturation | |
| Accuracy |
from 0.00 to 20.00 mg/L (ppm) 1.5 % of reading or
± 0.01 mg/L (ppm), whichever is greater
from 20.00 to 50.00 mg/L (ppm) ±5 % of reading
from 0.0 to 200.0 % saturation ± 1.5 % of reading
or ± 0.1 %, whichever is greater
from 200.0 to 500.0 % saturation ±5 % of reading
|
|
|
Barometric
Pressure |
Range | 450 to 850 mmHg; 600 to 1133 mBar; 60 to 133 kPa; 17 to 33 inHg; 8.7 to 16.4 psi; 0.592 to 1.118 atm |
| Resolution | 1 mmHg; 1 mBar; 1 kPa; 1 inHg; 0.1 psi; 0.001 atm | |
| Accuracy | ±3 mmHg within ±15 % from the calibration point ±3 mmHg ±1 least significant digit |
|
|
Temperature
|
Range | −20.0 to 120.0 °C −4.0 to 248.0 °F 253.0 to 393.0 K |
| Resolution | 0.1 °C; 0.1 °F; 0.1 K | |
| Accuracy | ±0.2 °C; ±0.4 °F; ±0.2 K | |
|
DO Calibration
|
Points |
One or two points automatic calibration at 100%
(8.26 mg/L) and 0% (0 mg/L).
Single point manual using a value entered by the
user in % saturation or mg/L.
|
| Standards | 0 and 100% saturation | |
| Reminder | Disabled Daily: 0 min. to 23 hours and 59 min. Periodic: 1 min. to 500 days, 23 hours and 59 min. |
|
| Temperature Compensation
Salinity
Compensation
|
Automatic or Manual
Automatic from 0 to 70 PSU (manually set)
0.0 to 70.0 % / 0.0 to 45.0 g/L / 0.0 to 42.0 psu
|
|
|
Reading
|
Modes | Direct Direct/Autohold |
| Stability criteria | Accurate Medium Fast |
|
| Isopotential | 7.000 or 4.010 | |
| Sampling rate | 1000 ms | |
|
DO Views
|
Basic | Measurement (DO, Temperature) Stability status |
| Simple GLP | Basic view information Last calibration date, offset, average slope |
|
| Full GLP | Simple GLP information and calibration point details | |
| Table | Measurements updated every second are displayed in table | |
| Graph (Plot) | Measurement versus time graph can be panned or zoomed (pinch-to-zoom technology) | |
|
Logging
|
Type | Automatic, Manual, Autohold |
| Number of records | 50 000 maximum perfile Stores at least 1 000 000 data points per user |
|
| Automatic interval | 1, 2, 5, 10, 30 seconds 1, 2, 5, 10, 15, 30, 60, 120, 150, 180 minutes |
|
| Sample ID | Incremental mode | |
| Export option | .csv file format | |
| Users | Up to 9 users and the default administrator account | |
|
Connectivity
|
USB-A | 2 ports for keyboard input or USB thumb drive |
| USB-C | 1 port for PC connectivity and USB-C type thumb drive | |
| Wi-Fi & Ethernet | FTP Web server Log transfer and download |
|
| RS232 | Connecting peripherals | |
| Power supply | DC adapter 100-240AC to 24VDC 2.5A | |
| Environment | 0 – 50 °C / 32 – 122 °F / 273 – 323 K maximum 95% RH non-condensing | |
| Dimensions | 205 x 160 x 77 mm (8.0 x 6.2 x 3.0 “) | |
| Weight | Approximately 1.2 kg (26.5 lbs.) | |
| 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.
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