Advanced Dissolved Oxygen Benchtop Meter with Polarographic DO Probe - HI6421P

HI6421P is a streamlined benchtop meter with a large touchscreen display, comprised of a housing and an integrated module designed for fresh and saltwater measurements of dissolved oxygen.

HI6421P includes the HI764833 polarographic probe. Slim and versatile, this probe covers a wide range of dissolved oxygen and has a built-in thermistor temperature sensor that compensates for temperature variations. The slim design allows for convenient measurement in test tubes and Biological Oxygen Demand (BOD) bottles.

Durable and robust, the probe features a platinum cathode and Ag/AgCl anode assembly. Accurate and with a fast response time, readings are not flow-dependent.
The probe is fitted with durable (PTFE), oxygen-permeable, screw-on membrane caps. Caps are filled with electrolytes and easily installed on the probe.

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.

Additional features include built-in methods and calculations for the measurement of BOD (Biological Oxygen Demand), OUR (Oxygen Uptake Rate), and SOUR (Specific Oxygen Update Rate).

Pressure compensation is done automatically (built-in barometer) or users have the option to manually enter the required value. Pressure is displayed in user-configurable units: mmHg, mbar, kPa, inHg, psi, and atm.

Features at-a-glance

User interface

• 7-inch capacitive touch screen with multi-touch support
• Capacitive touch back, home, and system menu keys
• 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

• Measure %Sat, mg/L, ppm (DO); mg/L, ppm (BOD); mg/L (OUR); ppm, mg/L (SOUR)
• Application-specific profiles allow quick and direct measurement without the need to update the
  sensor and system settings
• Active log during measurement Measurement stability indicator (using the Stability Criteria setting)
• Reading modes: direct and direct/auto-hold
• Temperature compensation can be Automatic or set manually
• Audible and/or alarm messages for measurements outside of predefined limits
• Galvanic isolation for measurement

Calibration

• One or two points of calibration at 0% and/or 100% saturation
• Single point manual calibration in mg/L or % saturation using a reference method
• Non-volatile memory saves data and settings

Logging

• Data log collection of at least 1,000,000 data points (with time and date stamp)
• Logging types: manual, automatic, auto-hold
• Sample ID for manual and auto-hold data

Connectivity features & services

• Transfer logged data ta a USB thumb drive
• Log files that include measurements and calibration data (as .csv file)
• FTP and email for log export via Ethernet and Wi-Fi connection
• USB type A for USB stick, keyboard, and printer
• USB type C for USB stick and PC connection

Primary Applications:

Fresh water and saltwater applications, aquaculture, aquariums, environmental.

Ordering Information:

HI6421P is supplied with HI764833 polarographic probe; 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.

 

Specifications

SKU	HI6421P
Product Name	Advanced Dissolved Oxygen Benchtop Meter with Polarographic DO Probe - HI6421P
DO (HI764833 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	Automatic-two points / User standard-single point
	Standards	0 and 100% saturation
	Reminder	Disabled / Daily
Temperature Compensation	Automatic or Manual
Reading	Modes	Direct/Auto hold
	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 the table
	Graph (plot)	Measurement versus time graph can be panned or zoomed (pinch-to-zoom technology)
Logging	Type	Automatic, Manual, Auto hold
	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
	WIFI-&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.)