PR1A Photocell



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The PR1a Photocell is manufactured by Alge and can be used up to 25m away from the reflector. 

The PR1a can be used in a few different ways depending on your requirements:

  • Photocell with a Reflector (up to 25m between)
  • Photocell with Photocell (up to 150m between)
  • Opt for a the wireless model and no cables with be required
  • Impulse accuracy up to 1/10,000 seconds
  • Long distance range
    • Reflection-Photocell about 25 m
    • Through-Beam-Photocell over 150 m (500 feet)
  • Variable power supply for the photocell
    • Battery operation
    • Power supply from ALGE-timing device
    • External power supply from 4 to 18 VDC
  • Battery indication with LED (green, yellow, red)
  • Indication of photocell adjustment with LED (green, yellow, red)
  • Synchronisation of two photocells (main and backup) to prevent interference
  • Adjustment of delay time (20 ms to 2 seconds (factory adjustment = 20 ms)
  • Optional upgrade to wireless
Range with Reflector: 0.5 to 25 Meter (1.6 to 82 feet)
Range with Transmitter and Receiver: 0 to over 100 Meter (0 to over 300 feet)
Impulse Output: NPN transistor, open collector, active low
Response Time: 300 µs, 1ms fix adjusted
Reaction Time: 20 to 2000 ms(adjustable delay time)
Measurements PR1A (without swivel head): about 118 x 87 x 44 mm
(about 4.646 x 3.425 x 1.732 in)
Weight PR1A: about 0.3 kg (about 0.66 lbs)
Weight PR1a-Ref: about 0.2 kg (about 0.44 lbs)
Switches: On/Off switch for battery
Three position switch for modes (Norm, TX, RX)
Power Supply: from ALGE timer: 5 VDC stabilized
external power supply: 4 - 18 VDC
internal Battery: 2 x AA-Battery
Power Consumption: from Battery with 2,5 VDC: 20 - 46 mA
from timing device 5 Vstab: 9 - 20 mA
Wireless: Optional wireless upgrade: PR1aW (trasmits up to 100m)
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