Advanced Dissolved Oxygen Benchtop Meter with HI764833 Polarographic DO Probe

Advanced Dissolved Oxygen Benchtop Meter with HI764833 Polarographic DO Probe

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. 

Key Features:

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:

• Network
• Connect and Print
• System
• Custom Users
• User Account Management
• Info Screen
• Log Recall
• Log History and Sharing
• Log Detail
• On-Board Help

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:

• Basic View: A view featuring basic information about measurement
• Simple GLP View: Displays basic  GLP data, including  Including latest calibration date and time, Offset value, average slope and electrode condition. 
• Full GLP View: A full GLP display featuring the electrode symbol and used buffers tray in addition to the above visuals.
• Graph View: A plotted graph of the current measurement
• Tabulated View: An organised table of data featuring date, time and notes in a list of recent measurements

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.

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 Email
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.