INSTRUMENTS & ACCESSORIES SensAlarm Plus Monitor ................................................................ 820-0301-01 SensAlarm Plus Monitor with 2nd Strobe ..................................... 820-0301-03 SensAlarm Plus Monitor with Battery Back-up .............................. 820-0301-02 SensAlarm Plus Monitor with Battery Back-up and 2nd Strobe .... 820-0301-04遥控传感器套件。........................................................................ 821-0301-01 SENSORS Acetylene IR – 50% LEL .................................................................. 823-0249-51 Ammonia – 100 ppm ..................................................................... 823-0201-21 Ammonia – 50 ppm ................................................................................................................................................. 823-0201-22氨 - 300 ppm ...................................................................................................................................................................................... 823-0205-52 Carbon Monoxide – 100 ppm low interference to H 2 .................... 823-0219-41 Carbon Monoxide – 500 ppm low interference to H 2 .................... 823-0219-42 Carbon Monoxide – 1000 ppm low interference to H 2 .................. 823-0219-43 Carbon Monoxide – 100 ppm ....................................................... 823-0219-23 Carbon Monoxide – 500 ppm ....................................................... 823-0219-22 Chlorine – 10.0 ppm ..................................................................... 823-0202-21 Chlorine – 5.00 ppm ..................................................................... 823-0202-22 Chlorine – 20.0 ppm ..................................................................... 823-0202-23 Chlorine (H2S Resistant) – 10.0 ppm ............................................. 823-0202-41 Chlorine (H2S Resistant) – 5.00 ppm ............................................. 823-0202-42 Chlorine (H2S Resistant) – 100 ppm .............................................. 823-0202-43 Chlorine Dioxide – 1.00 ppm ......................................................... 823-0239-41 Combustibles IR – 100% LEL .......................................................... 823-0211-51 Combustibles Catalytic Bead, General – 100% LEL ........................ 823-0211-31 Comb.