PHOTOIONIZATION LAMPS
Photoionization lamps are used as ionization sources in gas analyzers, gas chromatography detectors, mass-spectrometry and other devices.
The radiation spectrum of photoionization lamps in VUV-range consists of two resonance lines 116,5 and 123,5 nm for krypton lamps and 129,6 and 147,0 nm for xenon lamps. To extract the radiation MgF2 window is used.
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Several models of both DC and RF photoionization lamps are manufactured. The advantages of DC lamps are high stability and long life time. The RF lamps are less stable and the life time is shorter, their advantages are small size and low power consumption.
The lamps with glass and ceramic discharge channel are available. During lamp operation plasma interacts with discharge channel. For glass this results in emission of O2, CO, CO2, H2O etc molecules, that changes the gas filling of lamp and leads to lamp failure. There is no such change when ceramic channel is used, that has been confirmed by lamp spectra, where the lines of radiating gas present only.
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Radiation spectrum of Kr photoionization
lamp CDL-1050
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Radiation spectrum of Kr photoionization
lamp CDL-1050
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Using of ceramic discharge channel increases the lamp life-time up to 10000 h, that allows to use such lamps in fixed point photionization detectors.
Technical Specifications
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Glow discharge DC Photoionization Lamps
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Model
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CDL-1050
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CDL-1050
mod.К
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CDL 1021-03
mod. BDC
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CDL-1070
mod. GC
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Maximum photon energy, eV
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10,6 (Kr)
9,5 (Xe)
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10,6 (Kr)
9,5 (Xe)
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10,6 (Kr)
9,5 (Xe)
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10,6 (Kr)
9,5 (Xe)
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Ignition voltage, V
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450
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450
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450
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450
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Operation voltage, V
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230
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230
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230
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230
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Operation current, mA
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0,1 – 4,0
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0,1 – 4,0
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0,1 – 4,0
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0,1-4,0
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Max. length ´ diam., mm
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53 ´ 22
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55 ´ 21,5
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45 ´ 23,3
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50 ´ 18,7
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Discharge channel
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Ceramic
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Ceramic
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Ceramic
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Ceramic
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Operating temperature, °С
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Minus 20 - 350
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Minus 20 - 45
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Minus 20 - 45
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Minus 20 - 350
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Life time, hour
Ambient temperature
300 °C
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5000
500
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5000
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5000
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5000
500
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