Datasheet > R2868_15

R2868_15

更新时间： 2024-09-30 01:24:35

品牌	Logo	应用领域
HAMAMATSU		/
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2页	176K
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FLAME SENSOR UVTRON

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R2868_15 数据手册

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 fil-

ters, 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 cath-

ode (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.

Figure: UVTRON's Spectral Response and Various Light Sources

APPLICATIONS

100 ^{TPT B0009EB}

UVTRON's

SPECTRAL

RESPONSE

GFlame detectors for gas / oil lighters and matches

GFire alarms

GCombustion monitors for burners

GInspection of ultraviolet leakage

GDetection of discharge

SUNLIGHT

GUltraviolet switching

GAS

FLAME

TUNGSTEN

LIGHT

SPECIFICATIONS

GENERAL

100

Parameter

Description / Value Unit

200

300

400

500

600

700

800

900

Spectral Response

Window Material

Weight

185 to 260

UV glass

—

WAVELENGTH (nm)

VISIBLE

Approx. 1.5

ULTRAVIOLET

INFRARED

MAXIMUM RATINGS

Parameter

Supply Voltage

Peak Current ¹

Average Discharge Current ²

Operating Temperature

NOTE: 1This is the maximum momentary current that can be handled if its

full width at half maximum is less than 10 µs.

Value

400

Unit

°C

2If the tube is operated near this or higher, the service life is notice-

ably reduced.

3Measured under room illuminations (approx. 500 lux) and recommen-

ded operating conditions. Note that these values may increase if the

following environmental factors are present.

-20 to +60

(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.

CHARACTERISTICS (at 25 °C)

Parameter

Value

Unit

Discharge Starting Voltage

(with UV radiation) (DC)

Max.

280

(5)High electric field (including static field) generates across the tube.

Recommended Operating Voltage (DC)

325 25

min^-1

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.

Background ³

Sensitivity ⁴

Max.

Typ.

5000

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

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