4. GENERAL DESCRIPTION & INTENDED USE
HI6321 is an advanced benchtop meter with a capacitive display, comprised of a housing and an integrated
conductivity measurement module. Compact and easy to operate, the meter is delivered with HI7631233
EC and resistivity probe.
HI7631233 is a platinum, four‑ring probe with an integral temperature sensor that adjusts the measured
conductivity to a reference temperature by applying compensation algorithms:
•
linear: when the temperature coefficient of variation has the same value for all measurement temperatures
•
standard: for high‑purity water measurements (>1 MΩ
•
cm resistivity) and documented in ASTM Standard
D5391‑14
•
natural: for natural ground, well, or surface water (water with similar composition) as per ISO7888 standard
The result is reliable electrolytic conductivity, resistivity, TDS (Total Dissolved Solids), or Salinity (expressed in
percent, PSU, or ppt units).
TDS is a calculated value based on the conductivity of the solution (TDS = factor × EC
25
). A TDS factor is a
conversion factor used to change an EC measurement to a ppm measurement.
Sal PSU: The practical salinity of seawater relates the ratio of electrical conductivity of a normal seawater
sample at 15 °C and 1 atmosphere to a potassium chloride solution (KCl) with a mass of 32.4356 g/Kg water
at the same temperature and pressure. Under these conditions the ratio is equal to 1 and S=35. The practical
salinity scale may be applied to values 0 through 42.00 PSU at temperatures between 0 to 35 °C.
Sal ppt: measurements expressed in ppt are based on the Natural Seawater Scale that extends from 0.00 to
80.00 g/L and covers 10 to 31 °C temperature range. It determines the salinity based upon a conductivity ratio
of sample to standard seawater at 15 °C and an approximate salinity value of 35 in seawater.
Sal %: in this scale 100 % salinity is equivalent to roughly 10 % solids.
This system responds to a complex range of measurement and monitoring requirements, providing accuracy,
reproducibility, and reliability.
HI6321 is supplied with an electrode holder that has a flexible arm. The holder can be mounted quickly and
provides secure support for electrodes while taking measurements in sample containers.
This benchtop meter supports:
• USB type A – support for USB stick, printer, keyboard
• USB type C – support for USB stick, PC connection
The user can select between five different views.
• Basic measurement configuration
• Simple GLP with calibration information
• Full GLP with probe status and calibration point details
• Live updated, interactive graph
• Tabulated data with date, time, and notes
Capacitive touch screen with multi-touch support
The benchtop unit has a 7‑inch color display with resolution of 800×480. The capacitive, multi‑touch screen
supports video playback and data plotting.
General Description & Intended Use 6
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