Metrohm NIRS XDS RapidLiquid Analyzer - Manual (Page 82)

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5
Instrument Fails Performance
Test.
1. Verify that the sample drawer is not jammed or
impeded in any way. It should be free to open and
close under software control.
2. Temperature and/or humidity may be changing
rapidly during the test. This can usually be
observed as large spectral activity between 1300-
1400nm and 1800-1900nm. If this is the case, the
instrument should be tested in a more controlled
setting to verify proper operation.
3. Instrument may be located on a bench with
grinders, stirrers, or other laboratory equipment
which produces vibration or mechanical
disturbance. This shows up as spectral activity in
various areas, depending upon the transmitted
frequency of the motion. Turn off all equipment
that might cause such disturbance. Locate it to
another part of the laboratory, or place it on
isolated supports away from the XDS Analyzer.
4. A weak lamp will exhibit higher noise near the end
of its life. This may also show up as one or two
peaks in Performance Test not passing. If warm-up
does not help, consider a lamp change. A new
lamp will often solve a variety of subtle problems.
The Performance Test is the easiest way to track
lamp condition – as the lamp begins to fail, noise
goes upward.
6
Instrument fails Instrument
Calibration.
1. Verify that the sample drawer is not jammed or
impeded in any way. It should be free to open and
close under software control.
2. Verify that the Wavelength Standard is properly
positioned in the sample drawer when prompted
by software.
7
Instrument Gain is excessively
high in Gain Test.
1. NIR Gain should always be less than 10 on the
reference. Higher gain indicates lamp is out, or
instrument is in need of service.
2. Verify that lamp is lit. (see above)