Detector Deuterium Lamps
Replacement deuterium lamps for mainstream UV / DAD detectors from Agilent, Waters, Shimadzu, Hitachi and Thermo. High-purity quartz envelope, deuterium purity ≥ 99.999%, rated life ≥ 2000 hours, drop-in replacement with no adjustment required.
Replacement deuterium lamps compatible with UV/DAD detectors from Agilent, Waters, Shimadzu, Hitachi, Thermo and other major brands. High-purity quartz envelope, deuterium fill purity ≥ 99.999%, rated life ≥ 2000 hours, stable output and low baseline noise. Direct replacement for OEM lamps, no adjustment required.
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| Brand | Compatible models (examples) |
|---|---|
| Agilent | 1100 / 1200 / 1260 / 1290 series DAD |
| Waters | 2487 / 2489 / 2998 PDA |
| Shimadzu | SPD-M20A / SPD-M30A |
| Hitachi | L-2450 / L-7400 series |
| Thermo | Ultimate 3000 DAD |
Don't replace on burn hours alone
Rated life is a statistical figure; actual life depends heavily on the number of on/off cycles, power stability and flow cell cleanliness. Prepare to replace the lamp when any one of the following four applies:
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| Criterion | Symptom | Notes |
|---|---|---|
| Lamp energy drop | Intensity / Energy in the self-test report falls below the instrument threshold | The most direct indicator; most DADs show an energy curve on the self-test page |
| Rising baseline noise | Baseline noise clearly above the documented value under the same method | Usually appears before the energy alarm — the earliest observable signal |
| Loss of low-wavelength sensitivity | Response degrades markedly at 190–220 nm while higher wavelengths remain normal | Lamp ageing shows first at the low-wavelength end; methods detecting at 210 nm are the most sensitive to it |
| Cumulative burn hours | Approaching rated life | A backstop, not the sole criterion |
Two things you must do after replacing a lamp
- Wavelength / lamp calibration— a deuterium lamp has two characteristic emission lines at 486.0 nm and 656.1 nm, which the instrument uses to calibrate its wavelength axis. Without calibration after replacement, wavelength accuracy cannot be assured and method validation will fail.
- Adequate warm-up— allow 30–60 min for baseline drift to settle before injecting. Running a sequence immediately after ignition means the drift in the first few injections gets misread as a method problem.
Handling note: never touch the quartz window with bare hands during installation — fingerprints carbonize at high temperature and permanently reduce transmission. Record the replacement date and instrument serial number and reset the burn-hour counter, otherwise the next assessment has no baseline to compare against.