HANNA HI6421 Advanced Dissolved Oxygen Benchtop Meter with Optical DO Probe (opdo®)
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.
| SKU | HI6421 |
| Name | Advanced Dissolved Oxygen Benchtop Meter with Optical DO Probe (opdo®) – HI6421 |
| DO (HI7641133 Optical probe) Range | 0.00 to 50.00 mg/L (ppm) concentration; 0.0 to 500.0 % saturation |
| DO (HI7641133 Optical probe) Resolution | 0.01 mg/L (ppm); 0.1 % saturation |
| DO (HI7641133 Optical probe) 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 |
| Barometric Pressure Resolution | 1 mmHg; 1 mBar; 1 kPa; 1 inHg; 0.1 psi; 0.001 atm |
| Barometric Pressure 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 |
| Temperature Resolution | 0.1 °C; 0.1 °F; 0.1 K |
| Temperature 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. |
| DO Calibration Standards | 0 and 100% saturation |
| DO Calibration Reminder | Disabled Daily: 0 m in. to 23 hours and 59 m in. Periodic: 1 m in. to 500 days, 23 hours and 59 m in. |
| Temperature Compensation | Automatic or Manual |
| Salinity Compensation | 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 |
| Reading Stability criteria | Accurate Medium Fast |
| Reading Isopotential | 7.000 or 4.010 |
| Reading Sampling rate | 1000 ms |
| DO Views Basic | Measurement (DO, Temperature) Stability status |
| DO Views Simple | GLP Basic view information Last calibration date, offset, average slope |
| DO Views Full | GLP Simple GLP information and calibration point details |
| DO Views Table | Measurements updated every second are displayed in table |
| DO Views Graph (Plot) | Measurement versus time graph can be panned or zoomed (pinch-to-zoom technology) |
| Logging Type | Automatic, Manual, Autohold |
| Logging Number of records | 50 000 maximum per file Stores at least 1 000 000 data points per user |
| Logging Automatic interval | 1, 2, 5, 10, 30 seconds / 1, 2, 5, 10, 15, 30, 60, 120, 150, 180 minutes |
| Logging Sample ID | Incremental mode |
| Logging 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 |
| Connectivity USB-C | 1 port for PC connectivity and USB-C type thumb drive |
| Connectivity Wi-Fi & Ethernet | FTP / Web server Log transfer and download Email |
| Connectivity 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 | 1.2 kg (26.5 lbs.)1 |
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