Xylem YSI ProDSS, User Manual

Page: 25 / 92

23
Operation
Sensor Setup
→
Setup
The Sensor Setup menu will show all sensors connected to the instrument
(
Figure 23 ). If a sensor is connected but is not listed on the Sensor Setup
menu ( <None> displayed), check the sensor and cable connections
( “ProDSS sensor installation/removal” on page 9 ).
Setup ODO
→
Setup
→
ODO
Local DO : Enable or disable localized DO% measurements. When
enabled, the calibration value is set to 100% regardless of altitude or
barometric pressure. When enabled, an L will be shown next to DO% on
the run screen. DO mg/L measurements are unaffected when Local DO is
enabled (
Figure 24 ).
LDS : Last Digit Supression (LDS) rounds the DO value to the nearest
tenth, e.g. 8.27 mg/L becomes 8.3 mg/L.
Sensor Cap Coefficients : The sensor cap coefficients must be updated
after sensor cap replacement. Update the sensor cap coefficients using
the KorDSS software and the coefficient sheet provided with the new
sensor cap.
Setup Turbidity
→
Setup
→
Turbidity
TSS Coefficients : Total Suspended Solids (TSS) can be measured if
correlation coefficients are calculated in KorDSS.
To obtain these coefficients, collect turbidity data at the sampling site with
corresponding grab samples. Analyze the samples in a lab to determine
a true TSS measurement (mg/L). At least 2 and up to 6 value pairs of
turbidity and TSS measurements can be used.
NOTE: For highest accuracy, obtain 6 value pairs.
NOTE: Correlation data must be collected for each unique
sampling site, as this correlation is site-specific.
In KorDSS, enter the field-obtained turbidity measurements and the
corresponding lab-obtained TSS measurements. Coefficients can then
calculated with KorDSS and sent to the sensor.
NOTE: Although correlation coefficients can be entered directly
into the ProDSS ( Figure 25 ) only KorDSS can calculate the
coefficients.
Figure 23 Sensor Setup
Figure 24 Setup ODO
Figure 25
TSS coefficients