Wuhan Hangaodian Electronic Technology Co.,Ltd.
  Wuhan Hangaodian Electronic Technology Co.,Ltd.
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Vacuum gauge
UV light photosensitive diode
UV light diode
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UV light photosensitive diode
UV light photosensitive diode
Item No.:  

can be used as the detection head in the UV detector and automatic free extinguish system. 

    Typical operating theory of UV light photosensitive diode:
   
The UV light photosensitive diode has 2 symmertically designed electrode of a pure metal.when photons of sufficient energy range of 190-260nm stricke the negatively charged electrode(cathode),electrons will be emitted from it.If at that moment sufficiently high voltage is present these free electrodes will be accelerated in the direction of the positive electrode and in their path of travel through the gaseous atmosphere will ionize the gas,thus producing a gas discharge.This event causes the tube to become conductive as long as the voltage during the half period under consideration is above the quenching voltage for the discharge.
   The UV light photosensitive diode will stop firing once the voltage drops belong that level and fire again(if UV photons are still present)or the next half period. 
 

Type spectrum 
response
peak
wavelength
igniting 
voltage
(Max)
tube voltage
potential 
drop
operating 
voltage
operating
current
sensitivity
(Min)
background 
current(Max)
Diameter height
GD-18 190-290nm 210nm 260VDC <210VAC 220±10%DC 2mAr.m.s 20cps 10cpm 29±1mm 29±1mm
GD-19 190-290nm 210nm 550VAC 500VAC 700AC 10mAr.m.s 20cps 0.2cps 28±2mm 28±2mm
GD-34 160-260nm 195±5nm 450VDC 330VDC 525±25V 0.3mAr.m.s 20cps 0.2cps 15mm 34±2mm
GD-35 185-260nm 210±5nm 260VDC 220V 300-350VDC 0.3mAr.m.s 20cps 6cpm 14mm 34±2mm
GD-708 185-280nm 200-210nm 185VAC 200VAC 220±10%VAC 19mm 31±2mm

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