... explosive gas or inflammable dust environment 2)audio-light alarm light ApplicationThe product is suitable to IIA~IIC type ... :II.4, Architecture Description The product is composed of explosion-proof shell, toughened glass enclosure, inner alarm device, wire holder ... under the junction box. Alarming type: Buzzing device, light.5, Main Parameters RatedVoltage(V)Power(W)SparkingFrequencySound Strength( ...