Related by context. Frequent words. (Click for all words.) 59 photoelectric 55 nuisance alarms 53 audible alarms 53 detector 53 ionization 52 unvented 51 photocell 51 halogen bulb 51 microwatts 50 infrared beam 50 audible alarm 50 flammable gases 50 detectors 50 florescent light 49 smoke detector 49 combustion gases 49 ionizing 49 fluorescent lamp 49 microwave radiation 49 CO detector 49 ionisation 48 UV lamps 48 photodetector 48 propane cylinder 48 fluorescent tube 48 directional antenna 48 RF transmitter 48 crystal oscillator 48 radiation detector 48 infrared IR 48 microwave frequencies 48 sensor 47 non ionizing 47 plasmon 47 electrostatic discharge 47 explosive atmospheres 47 portable fire extinguishers 47 emitted 47 smoke alarm 47 photometer 47 millivolts 47 thermal imager 47 combustible gases 47 capacitive sensors 46 electromagnetic induction 46 emit 46 infrared thermometer 46 HID lighting 46 flammable vapors 46 photodiode 46 LED lamp 46 CO alarms 46 device 46 dimmer switches 46 spark ignition 46 downlight 46 9 volt batteries 46 electrical outlet 46 fluoresces 46 halogen lamp 46 protruding wires 45 gas chromatograph 45 compressed nitrogen 45 bacterial spores 45 RS# interface 45 electro static 45 fume hood 45 Smoke detectors 45 electrochemical reaction 45 gas hob 45 sensor detects 45 ultrasonic waves 45 altimeters 45 microwaves 45 UL Listed 45 milliwatt 45 electrically heated 45 dosimeter 45 CCFLs 45 Javascript disabled 45 LCD backlight 45 interferometric 45 igniters 45 R#a 45 ignition 45 overpressure 45 reactant 45 metal halide 45 combustible liquids 44 omnidirectional 44 decibels dB 44 Lithium batteries 44 switchbox 44 CFL bulb 44 depressurize 44 emergency locator transmitter 44 loopback 44 cold cathode fluorescent 44 Propane tanks 44 carbon monoxide 44 fluorescent light