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PDF R2868 Data sheet ( Hoja de datos )
| Número de pieza | R2868 | |
| Descripción | FLAME SENSOR UV TRON | |
| Fabricantes | Hamamatsu Corporation | |
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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 Flame detectors for gas/oil lighters and matches
q Fire alarms
q Combustion monitors for burners
q Inspection of ultraviolet leakage
q Detection of discharge
q 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
—
MAXIMUM RATINGS
Parameters
Supply Voltage
Peak Current 1)
Average Discharge Current 2)
Operating Temperature
Rating
400
30
1
-20 to +60
Units
Vdc
mA
mA
°C
CHARACTERISTICS (at 25°C)
Parameters
Discharge Starting Voltage (with UV radiation)
Recommended Operating Voltage
Recommended Average Discharge Current
Background 3)
Sensitivity 4)
Rating
280
325±25
100
10
5000
Units
Vdc Max.
Vdc
µA
cpm Max
cpm Typ.
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 sources are present.
5. High electric field (including static field) generates across the tube.
4) These are representative values for a wavelength of 200 nm and a light input
of 10 pW/cm2. In actual use, the sensitivity will vary with the wavelength of the
ultraviolet radiation and the drive circuitry employed.
Figure 1: UV TRON’s Spectral Response and Various
Light Sources
TPT B0009EA
100
UV TRON s
SPECTRAL
RESPONSE
SUNLIGHT
50
GAS
FLAME
TUNGSTEN
LIGHT
0
100 200 300 400 500 600 700 800 900
WAVELENGTH (nm)
ULTRAVIOLET
VISIBLE
INFRARED
Subject to local technical requirements and regulations, availability of products included in this promotional material may vary. Please consult with our sales office.
Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions.
Specifications are subjected to change without notice. No patent rights are granted to any of the circuits described herein. © 1997 Hamamatsu Photonics K. K.
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