Hot wire type sensor

1Hot wire type sensor
2Power110VAC/220VAC/230VAC 9V-20VDC
3Working temperature: -40degree~80 degree
4Alarm density: Coal gas: 1000~5000ppm, Liquid petroleum gas:1000~10000ppm, natural gas: 1000ppm~5000ppm
5Interconnecting Gas detector  
  (1)Circuit for normally closed rely contacts
  (2) Circuit for normally opened rely contacts
  (3)Operating Frequency: 433 MHZ/315MHZ (optional)