procurement of exploder 25 or 30 shots for mines of kanhan area , electronic exploder 25/30 shots : details specification : with in built circuit continuity tester and pre- firing cut off with high circuit resistance firing protection system with in built rechargeable with charger key and carrying case . tested by cmpi test report , dgms approved for use in degree i , ii , iii coal seam with isi mark isi license . details technical specification :1 . ) capacity ( shots ) :25/302 . ) maximum resistance in firing circuit 50 ( ohms ) 3 . ) firing current ( amps ) -1 . 54 . ) duration of riffing current ( mii . sec ) -less than 4 mili second5 . ) output ( dc volts ) - 500-6006 . ) dry cells 10 . 5v or 9 . 6v , ni-cd7 . ) dimension h-135 mm w-140mm , l-240mm8 . ) weight : 2 kg . approx9 . ) valid copy of dgms approval should be submitted along with supplied . special safety features : a . circuit tester : built in intrinsically safe circuit continuity tester to ensure before firing there are no breaks or unduly high resistance in the circuitsb . battery conditions indicatorc . output terminals are externally insulated and completely isolated from the circuit when the exploder is not in use . d . special type key: the exploder can be operated only with special type key in the proper sequence .