① Meet the standards UL-913 and UL-1203 ② Design can apply Class I, Div. I., Groups B, C, D combustible gas ③ 3 1/2 digit high definition single range LCD display ④ 10 files user select output range ⑤ 2 fully adjustable oxygen concentration alarms, programmable delay relay logic control ⑥ User programmable alarm delay: […]