Hand Cranked Blasting Machine with Digital Line Tester
ERNA-5 is a powerful blasting machine that comes with a built-in digital line tester or digital ohmmeter. It uses a hand generator and the operator does not need an external power supply or batteries. The blasting machine is portable, compact and lightweight, and can easily be operated by a single person.
The integrated line tester measures the detonator line resistance to identify short circuits, breaks in the blasting line or circuits with excessive resistance prior to the blast. For safety reasons, the line tester current is limited to 1 mA.
ERNA-5 includes output pulse tail cutting to limit the impulse to 4 ms and quench the remaining capacitor charge. These safety features are necessary to eliminate potential secondary explosions of the flammable dust generated during the blast.
The device comes in an aluminum enclosure and includes ON-OFF/L-test switch, terminals for connecting the electric detonator line, red/green LED for line testing and a crank handle or capacitor charging. Both sides of the panel include “READY” LEDs to indicate the capacitor charge state.
Features and Benefits
Medium energy blasting machine
Built-in line tester with digital 0-999 Ω reader
Short 4 ms output pulse
Maximum permitted line resistance for detonator classes
500 (Class 1, AFC 1.0A, AFI 3mJ/Ω)
205 (Class 2, AFC 1.5A, AFI 16mJ/Ω)
50 (Class 3, AFC 3.5A, AFI 140mJ/Ω)
Capacitor nominal value
11 - 12 crank turns
Firing impulse duration
Capacity (2.5Ω, Class 1 detonators)
Line resistance testing
0 - 999
Maximum line testing current
–25 to + 55, at 100% relative humidity
142 x 125 x 45