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Absorption measurements and fluorimetric measurements require single mono-
chromatic lines with high radiation density. Mercury low-pressure lamps emit a single monochromatic line at 253.7 nm, which is well reproducible and stable.
Heraeus Noblelight NK-series lamps are low-pressure mercury lamps that are sta-
bilised by the geometric form of the discharge tube and by a cover bulb which re-
duces influences of ambient fluctuations.
NK-series mercury lamps are used in photometers, polarimeters, fluorimeters, re-
fractometers, densitometers and in mercury gas detection equipment. Additionally they are used for wavelength calibration of optical measuring instruments and for disinfection. NK-series lamps are equipped with a quartz material that absorbs the 185 nm line produced in the low-pressure gas discharge. Therefore the NK-lamps do not produce any ozone.
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The guaranteed operating life for all lamp types is 2000 hrs with a reduction of the output of max. 50%. A normal useful operating life can be between 4000 and 6000 hrs. The lamp should be operated at ambient temperatures.
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Top image: Spectral distribution NK 2/1 |
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Relative Intensity (%) - for all NK lamp types
| Wave Length (nm) |
Intensity |
Wave Length (nm) |
Intensity |
| 248 |
0.1 |
313 |
2.8 |
| 253.7 |
100.0 |
334 |
0.1 |
| 265 |
0.1 |
366 |
2.2 |
| 276 |
0.1 |
405 |
1.6 |
| 280 |
0.1 |
408 |
1.6 |
| 289 |
0.9 |
436 |
1.1 |
| 297 |
0.6 |
546 |
1.6 |
| 302 |
0.4 |
577/579 |
0.5 |
MANUFACTURER SAFETY WARNING
UV radiation damages skin and eyes. Always wear protective glasses, gloves and clothing. |
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