The HI-6421/P Advanced Benchtop Meter for Dissolved Oxygen provides a laboratory-grade solution for measuring DO, BOD, OUR and SOUR in fresh and saltwater samples with a polarographic DO probe. This modern, streamlined meter has five individual viewing modes and ethernet and WiFi connectivity for easy remote data transfer.
| HI-6421 – DO (HI-7641133 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 |
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| HI-6421P – DO (HI-764833 Polarographic probe) | ||
| Range | 0.00 to 90.00 mg/L (ppm) concentration; 0.0 to 600.0 % saturation | |
| Resolution | 0.01 mg/L (ppm); 0.1 % saturation | |
| Accuracy | ±1.5 % of reading ±1, least significant digit | |
| 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 |
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| 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 |
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| Temperature | ||
| Range | −20.0 to 120.0 °C −4.0 to 248.0 °F 253.0 to 393.0 K |
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| Resolution | 0.1 °C; 0.1 °F; 0.1 K | |
| Accuracy | ±0.2 °C; ±0.4 °F; ±0.2 K | |
| DO Calibration | ||
| Points | DO optical 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 polarographic Automatic-two points / User standard-single point |
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| 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. |
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| Temperature Compensation | Automatic or Manual | |
| Salinity Compensation (Optical DO only) | 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 |
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| Reading | ||
| Modes | Direct Direct/Autohold |
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| Stability criteria | Accurate Medium Fast |
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| Isopotential | 7.000 or 4.010 | |
| Sampling rate | 1000 ms | |
| DO Views | ||
| Basic | Measurement (DO, Temperature) Stability status |
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| Simple GLP | Basic view information Last calibration date, offset, average slope |
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| 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 per file Stores at least 1 000 000 data points per user |
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| Automatic interval | 1, 2, 5, 10, 30 seconds 1, 2, 5, 10, 15, 30, 60, 120, 150, 180 minutes |
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| 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 |
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| 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 | HI-6421 is supplied with HI-7641133 optical dissolved oxygen probe (OPDO®); HI-764060 electrode holder; capillary pipette; 24 VDC power adapter; USB-C to USB-A cable; probe quality certificate; quick reference guide with instrument quality certificate. HI-6421P is supplied with HI-764833 polarographic probe; HI-764060 electrode holder; capillary pipette; 24 VDC power adapter; USB-C to USB-A cable; probe quality certificate; quick reference guide with instrument quality certificate. |