The Measurement Screen - Thermo Scientific NITON XL3t 500 User Manual

The Measurement
Detection Limit
Thermo Scientific
Screen
Tools Menu Tools Menu Tools Menu Tools Menu
Figure 1-2. The Standard Bulk Measurement Screen
At the top are the elements detected in the sample, and underneath this,
elements that are below the detection limit.
Use the 4 way touch pad or touch screen to scroll through the elements.
For an element to be detected by your analyzer in a given sample, the
measured concentration of the sample must be at least three times the
standard deviation of the measurement. This detection limit will depend on
the composition of the sample.
Precision The measurement precision for each element displayed appears to the right
of the measured concentration, under the heading "+-". The precision of
each measurement is two times the standard deviation (sigma).
An element is classified as "detected" if the measured concentration (in
ppm) is at least 1.5 times the precision. Detected elements are displayed in
ppm, followed by the measurement precision. Non-detected elements are
shown as < the detection limit for that sample. The detection limit for a
given element varies depending on the other elements in the matrix.
Reading Number
NAV Menu
Element
Column

The Measurement Screen

Mode
Nominal Seconds
Test Duration Line
Battery Life
Indicator
Two Sigma
Confidence
Column
Measured
Concentration
NITON XL3 Analyzer User's Guide 1-25