Conductivity - Xylem YSI ProDSS User Manual

Conductivity

A conductivity/temperature sensor must be installed on the bulkhead
compensation and measurements of all parameters except turbidity and TSS. Temperature calibration is not available
or required for accurate temperature measurements.
The conductivity/temperature sensor can measure and calculate conductivity, specific conductance (temperature
compensated conductivity), salinity, non-linear function (nLF) conductivity, TDS, resistivity, and density. Calibration
is only available for specific conductance, conductivity, and salinity. Calibrating one of these options automatically
calibrates the other conductivity/temperature parameters listed above. For both ease of use and accuracy, YSI
recommends calibrating specific conductance.
Figure 45 Calibrate specific conductance
Conductivity Calibration
1. If necessary, clean the conductivity cell with the supplied soft
brush. See Conductivity/temperature sensor maintenance on page
62.
2. Perform the "Calibration setup (pH, ORP, ISE, conductivity, turbidity,
and total algae sensors)" on page
3. Place the correct amount of conductivity standard into a clean and
dry or pre-rinsed calibration cup.
NOTE: Select the appropriate calibration standard for the
conductivity of the sampling environment. Standards
greater than 1 mS/cm (1000 s/cm) are recommended for
the greatest stability. For fresh water applications, calibrate
to 1,000 or 10,000 S. For salt water applications, calibrate
to 50,000 S.
4. Carefully immerse the sensors into the solution. Make sure the
solution is above the vent holes on the side of the conductivity
sensor. If using the ODO/CT assembly, ensure the vent holes at the
top of the sensor are completely immersed and the solution level
is at least 1/2 inch higher than these top vent holes
5. Gently rotate and/or move the sensor up and down to remove any
bubbles from the conductivity cell. Allow at least one minute for
temperature equilibration before proceeding.
6. Push the Cal key, select Conductivity, then select Specific
Conductance.
NOTE: Calibrating any conductivity calibration option will
automatically calibrate the other options. Specific
conductance is recommended for both ease of use and
accuracy.
7. Select Calibration value then enter the calibration value of the
standard used. Note the measurement units the instrument is
reporting and calibrating and be sure to enter in the correct
calibration value for the units being used. For example, 10,000 S
= 10 mS. Make sure that the units are correct and match the units
displayed on the handheld.
8. Observe the actual measurement readings for stability (white line
on graph shows no significant change for 40 seconds), then select
Accept Calibration
displayed in the message area.
(Figure 4 on page 9) for accurate temperature
33.
(Figure 45). "Calibration successful!" will be
Calibration
(Figure 46).
35