View R2868_199131.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

FLAME SENSOR UV TRON(R) 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 s. 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
RELATIVE SENSITIVITY, RELATIVE INTENSITY (ARBITRARY UNIT)
TPT B0009EA
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
100 UV TRON s SPECTRAL RESPONSE
SUNLIGHT 50
CHARACTERISTICS (at 25C)
Parameters Discharge Starting Voltage (with UV radiation) Recommended Operating Voltage Recommended Average Discharge Current Background Sensitivity 4)
3)
Rating 280 32525 100 10 5000
Units Vdc Max. Vdc A cpm Max cpm Typ.
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. (c) 1997 Hamamatsu Photonics K. K.
FLAME SENSOR UV TRON(R) R2868
Figure 2: Angular Sensitivity (Directivity)
VERTICAL VIEWING (Left fig.) 0 100% 30 80 60 60 40 20 90 ANODE CATHODE 90 90 ANODE CATHODE 60 60 30 30 80 60 40 20 90
TPT B0010EA
0 100% 30
UV EMISSION POINT
HORIZONTAL VIEWING @ (Right fig.)
60
Figure 3: Dimensional Outline (Unit: mm)
Figure 4: Recommended Operating Circuit
+ 10M 4.7 k* ANODE UV TRON R2868 32525Vdc 220pF 500V i CATHODE PULSE OUTPUT 10k 1000pF
TPT B0003EA
UV GLASS BULB CATHODE 5 12
12 MAX.
ANODE LEAD CATHODE LEAD
9.00.5
ANODE 32 MIN. 44 MAX.
231
8
4
81
* Be sure to connect the 4.7 k resistor within 2.5 cm from the anode lead end of UV TRON.
* UV TRON Driving Circuit C3704 series (Option)
Hamamatsu also provide the driving circuit C3704 series for R2868 operation. C3704 series include a high voltage power supply and a signal processing circuit in printed circuit board, which allows to operate R2868 easily as a flame sensor with the low input voltage (DC 6 to 30 V) only. For the details, please refer to the datasheet of C3704 series.
TPT A0024EA
ANODE
(Side View)
LEAD: CATHODE 18 MAX.
0.7
PRECAUTIONS FOR USE * Ultraviolet Radiation
The UV TRON itself emits ultraviolet radiation in operation. When using two or more UV TRONs at the same time in close position, care should be taken so that they do not optically interfere with each other.
* Vibration and Shock
The UV TRON is designed in accordance with the standards of MIL-STD-202F (Method 204D/0.06 inch or 10g, 10- 500Hz, 15 minutes, 1 cycle) and MIL-STD-202F (Method 213B/100g, 11ms, Half-sine, 3 times). However, should a strong shock be sustained by the UV TRON (e.g. if dropped), the glass bulb may crack or the internal electrode may be deformed, resulting in deterioration of electrical characteristics. So extreme care should be taken in handling the tube.
* Polarity
Connect the UV TRON with correct polarity. Should it be connected with reverse polarity, operating errors may occur.
WARRANTY.
The UV TRON is covered by a warranty for a period of one year after delivery. The warranty is limited to replacement of any defective tube due to defects traceable to the manufacturer.
HAMAMATSU PHOTONICS K.K., Electron Tube Center 314-5, Shimokanzo, Toyooka-village, Iwata-gun, Shizuoka-ken, 438-0193, Japan, Telephone: (81)539/62-5248, Fax: (81)539/62-2205,
U.S.A.: Hamamatsu Corporation: 360 Foothill Road, Bridgewater, N.J. 08807-0910, U.S.A., Telephone: (1)908-231-0960, Fax: (1)908-231-1218 Germany: Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49)8152-375-0, Fax: (49)8152-2658 France: Hamamatsu Photonics France S.A.R.L.: 8, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: (33)1 69 53 71 00, Fax: (33)1 69 53 71 10 United Kingdom: Hamamatsu Photonics UK Limited: Lough Point, 2 Gladbeck Way, Windmill Hill, Enfield, Middlesex EN2 7JA, United Kingdom, Telephone: (44)181-367-3560, Fax: (44)181-367-6384 North Europe: Hamamatsu Photonics Norden AB: Farogatan 7, S-164-40 Kista, Sweden, Telephone: (46)8-703-29-50, Fax: (46)8-750-58-95 Italy: Hamamatsu Photonics Italia S.R.L.: Via Della Moia, 1/E, 20020 Arese, (Milano), Italy, Telephone: (39)2-935 81 733, Fax: (39)2-935 81 741
TPT 1008E01 MAR.1998 CR Created in Japan

▲Up To Search▲

Price & Availability of R2868

	To Download R2868 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .