LimsPulse
Spectroscopy

Near-infrared (NIR) spectrometer

Measures how a sample absorbs near-infrared light (about 780–2500 nm) through glass or plastic, in seconds and without sample preparation. Used with chemometric libraries for raw-material identity testing, blend monitoring and moisture.

  • Pharmaceutical
  • Agriculture & grain
  • Food & beverage
  • Petrochemical
  • Polymers
  • Animal feed
Photo of a Near-infrared (NIR) spectrometer
Photo: Allancik, CC BY-SA 4.0 (cropped), via Wikimedia Commons
Follow your site SOP
This is a typical operating sequence for learning. Your instrument model and approved SOP take precedence.
STAGE 1

Before you start

  1. 1Check the instrument is within its calibration date and the daily performance check has passed.
  2. 2Confirm the correct, approved library or model version is selected for the material.
  3. 3For handheld units, check the battery and that the probe window is clean and undamaged.
  • Only use libraries and models that are validated and released under change control.
STAGE 2

Daily performance check

  1. 1Let the lamp warm up as the manufacturer recommends (often 15–30 minutes for bench units).
  2. 2Run the built-in tests: wavelength check, photometric noise, and reference (background) scan on the internal or external white standard.
  3. 3Record the pass/fail result. Do not analyse samples if any test fails.
STAGE 3

Identity testing at the warehouse

  1. 1Select the material code; the software loads the matching library method.
  2. 2Press the probe firmly against the inner polyethylene bag (or place the vial on the window), avoiding folds, labels and printed areas.
  3. 3Acquire the spectrum; the software compares it with the library and reports pass or fail.
  4. 4Record the result against the container number in the receiving record or LIMS.
  5. 5Quarantine any container that fails and inform QC; it then follows the full compendial testing or an investigation.
  • Do not measure through coloured, thick, laminated or foil-lined packaging unless the method was validated that way.
  • A pass means the spectrum matches the library entry. It does not replace other compendial tests such as assay or impurities.
STAGE 4

Shutdown

  1. 1Wipe the window or probe tip with a lint-free tissue and a little isopropanol if needed.
  2. 2Log off the software; switch off or dock a handheld unit for charging.
  3. 3Complete the instrument usage log.
In LimsPulse · Calibration Management

Keep every NIR in control: usage logs, calibration and maintenance schedules, and automatic blocking of overdue instruments.

See how