Datasheet

FLAME SENSOR UVTRON ®
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 UVTRON ultraviolet ON/OFF detector
that makes use of the photoelectric effect of metal and the gas
multiplication effect. It has a narrow spectral sensitivity of 185 nm
to 260 nm, being completely insensitive to visible light. Unlike
semiconductor detectors, it dose 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
●Flame detectors for gas / oil lighters and matches
●Fire alarms
●Combustion monitors for burners
●Inspection of ultraviolet leakage
●Detection of discharge
●Ultraviolet switching
SPECIFICATIONS
GENERAL
Parameter
Spectral Response
Window Material
Weight
Description / Value
185 to 260
UV glass
Approx. 1.5
Unit
nm
—
g
Value
400
30
1
-20 to +60
Unit
V
mA
mA
°C
RELATIVE SENSITIVITY, RELATIVE INTENSITY
(ARBITRARY UNIT)
Figure: UVTRON's Spectral Response and Various Light Sources
100
TPT B0009EB
UVTRON's
SPECTRAL
RESPONSE
SUNLIGHT
50
GAS
FLAME
0
100
200
300
400
TUNGSTEN
LIGHT
500
600
700
800
900
WAVELENGTH (nm)
ULTRAVIOLET
VISIBLE
INFRARED
MAXIMUM RATINGS
Parameter
Supply Voltage
Peak Current 1
Average Discharge Current 2
Operating Temperature
CHARACTERISTICS (at 25 °C)
Parameter
Discharge Starting Voltage
Max.
(with UV radiation) (DC)
Recommended Operating Voltage (DC)
Background 3
Max.
Sensitivity 4
Typ.
Value
Unit
280
V
325 ± 25
10
5000
V
min-1
min-1
NOTE: 1This is the maximum momentary current that can be handled if its
full width at half maximum is less than 10 µs.
2If the tube is operated near this or higher, the service life is noticeably reduced.
3Measured under room illuminations (approx. 500 lux) and recommended operating conditions. Note that these values may increase if the
following environmental factors are present.
(1)Mercury lamps, sterization 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.
4These 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.
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
subject to change without notice. No patent rights are granted to any of the circuits described herein. ©2014 Hamamatsu Photonics K.K.
FLAME SENSOR UVTRON ® R2868
Figure 2: Angular Sensitivity (Directivity)
VERTICAL VIEWING
(Left fig.)
0°
100 %
0°
100 %
30°
30°
30°
80
60
60°
60°
40
60°
40
20
20
90°
90°
90°
90°
ANODE
CATHODE
ANODE
CATHODE
UV GLASS BULB
A
A'
4.7 kΩ*
ANODE
CATHODE LEAD
UVTRON R2868
8±1
ANODE
ANODE
10 MΩ
+
ANODE LEAD
9.0 ± 0.5
CATHODE
5 × 12
TPT B0010EA
Figure 4: Recommended Operating Circuit
12 MAX.
Figure 3: Dimensional Outline (Unit: mm)
CATHODE
HORIZONTAL
VIEWING
(Left fig.)
80
60
60°
UV EMISSION
POINT
23 ± 1
DC 325 V ± 25 V
8 ± 1 4±1
PULSE OUTPUT
i
32 MIN.
TOP VIEW
A – A'
CATHODE
220 pF
500 V
44 MAX.
10 kΩ 1000 pF
–
SIDE VIEW
* Be sure to connect the 4.7 kΩ resistor within 2.5 cm
from the anode lead end of UVTRON.
ANODE
TPT C0003EB
LEAD: 0.65 ± 0.05
CATHODE
●UVTRON Driving circuit C10807 series (sold separately)
18 MAX.
TPT A0023EB
Hamamatsu also provide the driving circuit C10807 series for R2868
operation.
Since the high-voltage supply and
signal processor are mounted on
the same circuit board, the C10807
can be operated as a high-sensitivity flame sensor just by connecting
a UVTRON and supplying a low
DC voltage (5 V to 24 V).
For the details, please refer to the
data sheet of C10807 series.
■PRECAUTIONS FOR USE
●Ultraviolet Radiation
The UVTRON itself emits ultraviolet radiation in operation. When using two or more UVTRONs at the same time in close
position, care should be taken so that they do not optically interfere with each other.
●Vibration and shock
UVTRONs have passed vibration and shock tests in compliance with IEC 60068-2-6 (sinusoidal vibration test 1.5 mm
peak to peak, 100 m/s2, 10 Hz to 500 Hz) and IEC 60068-2-27 (shock test 1000 m/s2, 11 ms). However if subjected to
strong mechanical shocks such as drop impacts, the glass envelope may crack or internal electrodes may deform
resulting in poor electrical characteristics. So use extreme caution when handling the UVTRON. If the leads are machined
or cut with a wire cutter, the internal electrodes may be subjected to vibrations or shocks greater than the above tests,
resulting in poor electrical characteristics as in the case where they are subjected to drop impacts.
●Polarity
Connect the UVTRON with correct polarity. Should it be connected with reverse polarity, operating errors may occur.
■WARRANTY
The UVTRON 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.
www.hamamatsu.com
HAMAMATSU PHOTONICS K.K., Electron Tube Division
314-5, Shimokanzo, Iwata City, Shizuoka Pref., 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 E-mail: [email protected]
Germany: Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49)8152-375-0, Fax: (49)8152-2658 E-mail: [email protected]
France: Hamamatsu Photonics France S.A.R.L.: 19, 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 E-mail: [email protected]
United Kingdom: Hamamatsu Photonics UK Limited: 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire AL7 1BW, United Kingdom, Telephone: (44)1707-294888, Fax: (44)1707-325777 E-mail: [email protected]
North Europe: Hamamatsu Photonics Norden AB: Torshamnsgatan 35 SE-164 40 Kista, Sweden, Telephone: (46)8-509-031-00, Fax: (46)8-509-031-01 E-mail: [email protected]
Italy: Hamamatsu Photonics Italia S.r.l.: Strada della Moia, 1 int. 6, 20020 Arese (Milano), Italy, Telephone: (39)02-93581733, Fax: (39)02-93581741 E-mail: [email protected]
TPT 1008E03
China: Hamamatsu Photonics (China) Co., Ltd.: B1201 Jiaming Center, No.27 Dongsanhuan Beilu, Chaoyang District, Beijing 100020, China, Telephone: (86)10-6586-6006, Fax: (86)10-6586-2866 E-mail: [email protected]
JUL. 2014 IP
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