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| | Don’t | | :--- | :--- | | Do let the lamp warm up for 60 minutes before running a calibrated method. | Don’t turn the detector off and on repeatedly (stresses the igniter). | | Do flush the cell with degassed water after using buffers. | Don’t leave a buffer in the cell overnight—crystals will scratch the quartz windows. | | Do keep a log of lamp energy readings (in Monitor mode). | Don’t trust the "Lamp hours" counter exclusively—it doesn't account for intensity decay over time. | | Do run a Wavelength Calibration after moving the instrument. | Don't open the optical unit unless you are in a cleanroom—dust kills sensitivity. |

: A quick glance at the front panel saves time: Green is ready, Orange is sleep mode, and Red indicates an error Shimadzu Scientific Instruments 2. Extending Lamp Life & Performance shimadzu spd20a user manual better