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Conventional heat detector

Product Overview

  OT303 Heat Detector is designed to timely and automatically detect and judge on-site fire factors. With a precise NTC resistor, it can sense the environment temperature. It also can automatically realize contamination compensation of non fire factors (like temperature, humidity, dust, etc.) and effectively keep detector in a steady status.


  • Super-thin design for thickness, just 38mm.
  • Adopt SMT technology, firmly, high security and antijamming
  • Special methods for dampproof, antisepsis and mildew proof.
  • Flame retardant thermoplastic
  • Easy plug-in structure
  • 2-wire without polarity

  Operating voltage: DC20V~DC28V
  Standby current: ≤100μA  
  Alarm current: ≤35mA
  Operating environment:
  Temperature: -10~50℃
  Relative humidity: ≤95%
  Dimension: Diameter 100mm  Height 38mm  Weight 125g