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R2868

Hamamatsu Corporation
Part Number R2868
Manufacturer Hamamatsu Corporation
Description FLAME SENSOR UV TRON
Published Apr 16, 2005
Detailed Description FLAME SENSOR UV TRON® R2868 Quick Detection of Flame from Distance, Compact UV Sensor with High Sensitivity and Wide Di...
Datasheet PDF File R2868 PDF File

R2868
R2868

Overview
FLAME SENSOR UV TRON® R2868 Quick Detection of Flame from Distance, Compact UV Sensor with High Sensitivity and Wide Directivity, Suitable for Flame Detectors and Fire Alarms.
Hamamatsu R2868 is a UV TRON ultraviolet detector that makes use of the photoelectric effect of metal and the gas multiplication effect.
It has a narrow spectral sensitivity of 185 to 260 nm, being completely insensitive to visible light.
Unlike semiconductor detectors, it does not require optical visible-cut filters, thus making it easy to use.
In spite of its small size, the R2868 has wide angular sensitivity (directivity) and can reliably and quickly detect weak ultraviolet radiations emitted from flame due to use of the metal plate cathode (eg.
it can detect the flame of a cigarette lighter at a distance of more than 5 m.
).
The R2868 is well suited for use in flame detectors and fire alarms, and also in detection of invisible discharge phenomena such as corona discharge of high-voltage transmission lines.
APPLICATIONS q q q q q q Flame detectors for gas/oil lighters and matches Fire alarms Combustion monitors for burners Inspection of ultraviolet leakage Detection of discharge Ultraviolet switching GENERAL Parameters Spectral Response Window Material Weight Dimensional Outline Rating 185 to 260 UV glass Approx.
1.
5 See Fig.
3 Units nm — g — NOTES: 1) This is the maximum momentary current that can be handled if its full width at half maximum is less than 10 µs.
2) If the tube is operated near this or higher, the service life is noticeably reduced.
Use the tube within the recommended current values.
3) Measured under room illuminations (approximately 500 lux) and recommended operating conditions.
Note that these values may increase if the following environmental factors are present.
1.
Mercury lamps, sterilization lamps, or halogen lamps are located nearby.
2.
Direct or reflected sunlight is incident on the tube.
3.
Electrical sparks such as welding sparks are present.
4.
Radiation sourc...


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