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The HI-6421/P polarographic DO meter is a highly accurate laboratory benchtop solution for measuring dissolved oxygen, biochemical oxygen demand, oxygen uptake rate and specific oxygen uptake rate in salt and freshwater samples. This meter is supplied with a polarographic probe, while the HI-6421 is supplied with an optical Opdo probe.
The Hanna HI-764833 polarographic probe is a slim and versatile option covering a wide range of dissolved oxygen. This probe has a platinum cathode with Ag/AgCl anode assembly, enabling a fast response time with readings that are not dependent on flow.
The HI-764833 also features a built-in thermistor temperature sensor, allowing for compensation with temperature variation. The slim shape and size of this DO probe make it suitable for use with test tubes and BOD bottles.
Practical, streamlined design
Every meter in the HI-6000 series is designed with modern laboratories in mind, with a compact footprint and minimalist design to allow for ease of operation and placement. A large, capacitive touchscreen makes it easy to set up and take measurements, while connectivity via WiFi and ethernet allows for flexibility in placement, with no requirement for proximity to a PC or printer.
Supplied with Hanna polarographic DO probe
The Hanna HI-764833, a slim test tube-compatible polarographic probe, is supplied with the HI-6421/P. This robust probe is designed for a wide range of applications and is fitted with durable (PTFE), oxygen-permeable, screw-on membrane caps. These caps are filled with electrolyte and easily installed on the probe.
Automatic compensation
The HI-6421/P automatically compensates for barometric pressure, temperature, and salinity. Temperature is automatically measured and compensated for, while salinity is compensated automatically once a salinity concentration of the water has been defined manually.
A built-in barometer allows pressure compensation to be automatic or manually entered depending on specific requirements, with a range of user-configurable units offered: mmHg, mbar, kPa, inHg, psi and atm.
Built-in methods and calculations
The Hanna HI-6421/P advanced DO meter also can act as an OUR, SOUR and BOD meter, with built-in methods and calculations included within the instrument to allow for accurate and reliable measurement of these parameters.
Flexible electrode holder
The electrode arm included with the HI-6421/P DO meter can be mounted to either side of the meter, allowing for further flexibility in placement. This electrode stand is designed to securely hold the probe when measuring a sample of salt or freshwater, helping to ensure accuracy in testing.
Repeatable and reliable parameter measurement
The HI-6421/P provides repeatable, accurate and reliable measurements in freshwater and saltwater samples. This advanced benchtop meter and four-ring probe provide precise readings for DO, BOD, SOUR and OUR.
Complete flexibility
The ability to connect and share data via WiFi and ethernet removes the restriction of placement within the laboratory, with the HI-6000 series not requiring direct connection to a PC or printer. The flexible electrode arm can also be mounted to either side of the unit, saving bench space and allowing the HI-6421/P to be placed up against a wall on either side if required.
Intuitive, practical interface
The HI-6421/P features a comprehensive, easy-to-use interface, with access to a wide range of settings and customisations to tailor this advanced DO meter to your requirements. The menu system includes:
Choose from five measurement views
Five purpose-built measurement views are available for the HI-6431/P, enabling you to tailor your measurement screen to the most relevant information:
One million data point storage
The extensive capacity of the HI-6421/P DO meter allows up to one million individual data points to be stored, inclusive of both date and time stamps. This organised information is available for export in .csv format via WiFi, ethernet, direct connection or USB stick, with no specialist software required to access measurements.
Audible and visual alarm system
The HI-6000 series includes customisable visual and audible alarms within the settings menu. These alarms can be fully tailored to individual requirements, allowing users to define a specific range for samples. Measurements outside of this range will trigger the audible and visual alarms automatically.
Remote connectivity with ethernet and WiFi
In-built WiFi and ethernet connectivity allow the HI-6421/P to transfer data without the need to connect directly to a PC. Digital transfer is available via FTP or email, providing flexibility to send measurements to laboratory offices or directly to clients as required, with no additional steps or software to access the results of testing.
USB C and USB A included
A USB A and USB C connection is included with HI-6000 series meters, both for the connection of peripherals such as keyboards and for the transfer of data. Information can be exported via USB stick or the HI-6421/P can be connected to a laptop, PC or printer to export data in a universal .csv alongside remote WiFi and ethernet connection.
Complete tutorial system
The HI-6421/P has an in-built tutorial system, with both text prompts and video tutorials to suit your preferred learning style. These tutorials cover all of the fundamentals of operating HI-6000 series lab meters, making it easy to start measurement with a minimal learning curve.
User customisability
Customise access and permissions directly on the HI-6000 series meters, with the ability to create both standard and administrator users. Administrators have full control via the Account Management Screen, enabling standard users to have specific permissions or to have limited access to certain functionalities.
If you would like to book a demonstration or discuss your requirements for DO measurement with our experts, get in touch directly. Call us at 01525 850 855 or email us at [email protected] to speak to our specialists.
What instruments are in the HI-6000 range?
The HI-6000 range includes:
Is the HI-6421/P DO meter suitable for laboratory usage?
The HI-6000 series, including the HI-6421/P polarographic DO meter, is specifically designed to be functional and practical in a laboratory environment. These exceptionally accurate, laboratory-grade meters are an ideal solution for industrial applications both within businesses and within the laboratories that provide outsourced services for clients within industries.
What are the key features of the HI-6421/P?
Some of the key features of the Hanna HI-6421/P include:
What industries is the HI-6421/P suitable for?
The HI-6421/P lab meter is a versatile solution for accurately measuring dissolved oxygen in salt and freshwater. This advanced meter for DO is suitable for a range of different niches and applications that require the measurement of natural water, wastewater and other kinds of water.
| 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 | |
| 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 | |
| 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 | 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 | |
| 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 | 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 | |
| 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 per file |
| 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.) |
Our standard delivery is 3-5 working days (where products are available) Monday to Friday, excluding public holidays when you order by 2pm. Details of our returns and cancellation policy can be found in our Returns Policy & Section 11 of our Terms and Conditions. For more information please contact us on 01924 444 577 or Email Us.
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Key Features of HI-6000 Modular System:
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