The Electric Detonator – How it works


The Electric Detonator – How it works 
                   

1 Copper tube, 2 Base charge (eg. P.E.T.N.), 3 Primary 
charge (eg. Lead azide), 4 Match or Fuse head, 5 Bridge 
wire, 6 Solder, 7 Neoprene plug, 8 Lead wires. 
 Electric current from an exploder applied to the lead wires 
causes the bridge wire to “blow”, in the manner of a normal 
electric fuse. This ignites the match (or fuse) head, which in 
turn ignites the primary charge. As this charge consists of 
primary explosive it almost instantly burns to detonation (see 
above), which then detonates the less sensitive but more 
powerful base charge. 
NB Plain detonators consist of just items1,2&3 – a fuse is 
crimped into the tube instead of the other items & this then 
ignites the primary charge. 
fig.5 7
Delay Detonators 
Fig.6
These are the same as ordinary or “instantaneous” electric 
detonators but have a short delay fuse between the fuse 
head & primary charge. The period of this delay depends on 
the dets series & number. For the “half second delay series” 
detonators the delay varies from no. 0–10 in 0.5s steps i.e. a 
no. 10 det gives a 5 s delay. In the “millisecond delay series” 
the range goes from no 0-15, the delay interval bet
Delay Detonators 

These are the same as ordinary or “instantaneous” electric 
detonators but have a short delay fuse between the fuse 
head & primary charge. The period of this delay depends on 
the dets series & number. For the “half second delay series” 
detonators the delay varies from no. 0–10 in 0.5s steps i.e. a 
no. 10 det gives a 5 s delay. In the “millisecond delay series” 
the range goes from no 0-15, the delay interval between no. 
0 & 15 being 750ms 
Read more a bout Explosives and Blasting in Mines
http://www.mine-explorer.co.uk/white_papers/11.pdf



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