產品介紹 Products Information

聯絡資訊 Contact
  • 半導體IC產品
  • 聯絡人: 劉小姐
  • 電話: +886-2-8772-8910 分機 619
聯絡資訊 Contact
  • 電子零件產品
  • 聯絡人: 林小姐
  • 電話: +886-2-8772-8910 分機618
聯絡資訊 Contact
  • 真空相關產品
  • 聯絡人: 王經理
  • 電話: +886-2-8772-8910 分機161
聯絡資訊 Contact
  • PCB機器
  • 聯絡人: 王小姐
  • 電話: +886-2-8772-8910 分機631
聯絡資訊 Contact
  • 化學相關產品
  • 聯絡人: 陳小姐
  • 電話: +886-2-8772-8910 分機633
聯絡資訊 Contact
  • 不確定品牌/型號
  • 聯絡人: 陳小姐
  • 電話: +886-2-8772-8910 分機633

Flame Sensor (UVTRON®)

E-mail contact

+886-2-8772-8910

FEATURES
● High Sensitivity
The UVTRON responds to faint ultraviolet emissions from flames, so it can accurately detect even small ignitions. Its high sensitivity allows reliable operation even in wide open space such as gymnasiums and other large composite facilities.

● High Speed Response
As the UVTRON detects ultraviolet light, detection is possible immediately after an ignition or discharge. High-speed response in few milliseconds makes it possible to take prompt action in the event of a fire or other emergency situation.

● Compact / Light Weight
Its compact size and lightweight enable the UVTRON to be employed even in compact detectors. Further, the best type of UVTRON can be selected according to the application or location from a product lineup that includes several shapes.

● Solar Blind
UVTRON has an extremely narrow spectral response range from 185 nm to 300 nm and is insensitive to visible light. And the Ni electrode does not respond to ultraviolet radiation in sunlight.

 

APPLICATIONS

● Combustion Monitoring Apparatus for Gas and Oil Burner
● Fire Alarm Apparatus
● Arson Watch Monitors
● Photoelectronic Counter
● Detection of Ultraviolet Ray Leakage
● Detection of Discharge Phenomenon

 
 
FLAME SENSOR UVTRON®

Parameter

R13192

R9454

R2868

R9533

R244

R14388

R12257

Unit

Electrode material

Ni

Mo

Spectral response range

185 to 260

185 to 300

nm

Maximum
ratings

Supply voltage (DC)

420

500

400

400

575

420

425

V

Average discharge current ①

3

1

3

10

mA

Peak current ②

50

30

50

200

mA

Operation ambient temperature

-40 / +125

-40 / +125

-40 / +125

°C

Characteristics
(at 25 °C)

Discharge starting voltage (DC)

Max.

260

360

280

280

440

260

240

V

Discharge sustaining voltage (DC)

Typ.

185

300

240

230

330

185

170

V

Sensitivity ③

Typ.

15000

4000

5000

10000

480

10000

1200

min-1

Background ④

Max.

5

10

5

10

min-1

Estimated life ⑤

25000

10000

h

Recommended
parameters

Supply voltage (DC)

325 ± 25

400 ± 25

325 ± 25

350 ± 25

500 ± 50

325 ± 25

310 ± 25

V

Average discharge current

0.3

2

mA

Quenching time ⑥

Min.

2

2

2

1

3

2

1

ms

Weight

5.2

1.5

1.5

2.5

3

5.3

5

g

Suitable socket (Sold separately)

E678-9C

E678-8F

E678-9C


① Even at these current values, the electrodes are not consumed immediately, but the service life is noticeably reduced. Use the tube within the recommended current values.
② This is the maximum momentary current that can be handled if its full width at half maximum is less than 10 s.

 

 

③ These are representative values for a wavelength of 200 nm and a light input of 10 pW/cm2. Think of these values as relative sensitivity values. In actual use, the sensitivity will vary with the wavelength of the ultraviolet radiation and the drive circuitry employed.
④ Measured under room illuminations (approximately 500 lux) and recommended operating conditions. Note that these values will increase somewhat in outdoor uses due to the effect of sunlight.
 This is the service life under the recommend operating conditions. Since high ambient temperatures will reduce the service life, when using the tube in a high-temperature application, such as a burner monitor, consider using air-cooling. The UVtron is covered by a warranty for a period of one year after delivery.
 When configuring the tube with an external quenching circuit, use circuit constants so that the quenching time becomes longer than these values listed. When using a pulse driven circuit using CR, if the applied voltage is in the recommended range, the quenching time tq can be calculated with the following formula. (Refer to the diagram of the recommended operating circuit.)
tq 0.5 X C1 • R1

 The RMS voltage when pulsating current is supplied.

 

 

 

 

 

 

 

STRUCTURE AND BASIC OPERATING PRINCIPLES

The UVTRON is a bipolar tube with a structure similar to that of a phototube. Just as with phototubes, the UVTRON utilizes the photoelectric emission effect, but the inside of the UVTRON tube is filled with special a gas rather than be- ing a vacuum, so it operates as a discharge tube. Figure 2 shows its structure and a schematic diagram of operation. A voltage is applied across the anode and photocathode (cathode) which is only sensitive to ultraviolet light. When UV light passing through the UV glass (UVTRON bulb) strikes the cathode, photoelectrons (electrons) are emitted from the cathode surface due to the photoelectric emission effect. These photoelectrons are then drawn to the anode by the elec- trical field created by the supply voltage. If the supply voltage is low, the operation is the same as for a phototube and the current, i, is extremely weak. When the voltage is increased to strengthen the electrical field, the photoelectrons are accelerated so they collide with the gas molecules within the tube and ionize them. The electrons produced by ionization continue to collide with other gas molecules while causing ionization until they finally reach the anode. Meanwhile, the positive ions are accelerated towards the cathode and the resulting collisions with the cathode generate a great number of secondary electrons. As this cycle is repeated, a large current suddenly flows between the anode and cathode, creating an electrical discharge. This phenomenon is called gas multiplication and the voltage at which this discharge starts is called the discharge starting voltage Vl of the UVTRON. Once the electrical discharge has begun, the tube is filled with electrons and ions and the voltage that maintains the discharge drops to a low value. This value is called the discharge sustaining voltage Vs. Figure 3 shows this state. The UVTRON primarily operates in the glow discharge region, but in this region, since the discharge sustaining voltage Vs is lower than the discharge starting voltage Vl, the discharge will continue unless some means is employed to control the supply voltage.

 

 

 

 

 

檔案下載