The most cost-effective proof telephone, mining explosion-proof telephone HDB-2 
 Product features 
 The phone is intrinsically safe with ordinary telephone function, also has a fully electronic non-contact sensing circuit using a special technology. Phone and associated equipment, the BOH-1 explosion proof coupler supporting connection with the switch, the composition of the explosion-proof communications system. 
 Scope of application 
 Explosive gas mixtures dangerous places: Zone 0, Zone 1, Zone 2 
 ● explosive air mixture: IIA, IIB, IIC, 
 ● temperature groups: T1-T6 
 ● Indoor and outdoor 
 Mining HDB-2 explosion-proof telephone, KTH18 Flameproof explosion-proof telephone, HCX-3 magnet Phone 
 Model 
 Type ringing voltage 
 Bell-vibratin voltage 
 (DC) ring current 
 Bell-vibratin current 
 Explosion-proof mark (mA) 
 Ex-marking in protection class 
 The Protected the class Dimension 
 Dimensions 
 (Mm) and associated equipment 
 Associate dequipment 
 HDB-2 ≤ 48V ≤ 25 ExiaIICT6 IP65 410 × 260 × 185 HOB--1-type 
 Ex coupler