Measurement

• Measurement of μS/cm, mS/cm (conductivity); Ω·cm, kΩ·cm and MΩ·cm (resistivity); ppm, ppt (TDS); ppt, PSU, % (salinity) as a function of temperature

• Application-specific profiles allow fast and direct measurement without updating sensor and system settings

• Activity log during measurement

• Measurement stability indicator (set using stability criteria)

• Reading modes: direct and direct/auto-hold

• Temperature compensation can be set to automatic or manual

• Audible and/or alarm messages when measurement exceeds predefined limits

• Galvanic isolation for conductivity measurement

• The HI6321 is a streamlined benchtop instrument with a large touchscreen display, consisting of the instrument housing and an integrated conductivity measurement module.

• The HI6321 is compact and easy to operate, and includes Hanna's HI7631233 four-ring conductivity/resistivity/TDS/salinity probe.

• The HI7631233 is recommended for water applications in a wide range of industrial processes. It provides stable measurement over a wide measuring range and does not require frequent calibration. The integrated temperature sensor measures the process temperature and adjusts the measured conductivity to the reference temperature by applying specialized compensation algorithms:

• Linear: Applicable when the temperature coefficient of variation is assumed to be the same value for all measured temperatures.

• Standard: Suitable for high-purity water measurement and documented in ASTM standard D5391-14. This setting should be used for resistivity measurements greater than 1 Mohm.cm.

• Natural: Suitable for natural groundwater, well water or surface water (or water of similar composition) in accordance with ISO7888.

• TDS is a calculated value based on the conductivity of the solution (TDS = coefficient x EC25). The TDS coefficient is the conversion factor used to change the EC measurement value to a ppm measurement value.

• Sal psu: The practical salinity of seawater is related to the ratio of the conductivity of a normal seawater sample at 15°C and 1 atmosphere to that of a potassium chloride solution (KCl) with a mass of 32.4356 g/Kg at the same temperature and pressure. Under these conditions, this ratio is equal to 1 and S = 35. At temperatures from 0 to 35°C, the practical salinity scale is applicable to values from 0 to 42.00 psu.

• Sal ppt: The measured value expressed in ppt is based on the natural seawater scale from 0.00 to 80.00 g/L, covering a temperature range of 10 to 31°C. It determines salinity based on the conductivity of the sample relative to standard seawater at 15°C and a salinity value of approximately 35 in seawater.

• Sal%: In this range, 100% salinity corresponds to approximately 10% solids.

• User Interface

• 7-inch capacitive touchscreen with multi-touch support

• Capacitive touchscreen, home and system menu keys

• User-friendly icons and symbols allow users to easily navigate and interpret instrument functions.

• Users can choose between five different views:

• Simple GLP with calibration information

• Full GLP with electrode status and calibration point details

• Interactive graph with real-time updates

• Tabular data including date, time and comments

• Calibration

• Standard single-point salinity calibration with 100% salinity standard, reading salinity scale set to %

• Standard single or multiple conductivity calibration using standards

• Non-volatile memory retains data and settings

• Logging

• Data log collection of at least 1000000 data points (with time and date stamp)

• Logging types: manual, automatic, auto-hold

• Sample ID for manual and auto-hold data

• Connectivity and Services

• Transfer logged data to USB drive

• Includes log files of measurement and calibration data (as .csv files)

• FTP and email for exporting logs via Ethernet and Wi-Fi connection

• USB Type A for USB flash drive, keyboard and printer

• USB Type C for USB flash drive and PC connection

• Instrument Guided Help Section

• Video-supported demonstrations of main functions