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ERNA-4

Hand Cranked Blasting Machine with Line Tester

ERNA-4 is a medium energy blasting machine that comes with a built-in three point line tester.  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 verifies the line’s integrity and uses 3 two color LEDs that correspond to the 3 detonator classes, and indicate to the user that his or her chosen detonators can be fired. For safety reasons, the line tester current is limited to 1 mA.

ERNA-4 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, 3 color LED for line testing and a crank handle for 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 selectable Class 1, 2 or 3 line resistance settings

  • 3 two color LEDs for line resistance

  • Short 4 ms output pulse

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Technical Specifications

Metric

Units

Value

Maximum permitted line resistance for detonator classes

Ω

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)

Firing voltage

V

560

Firing energy

J

12.8

Firing impulse duration

ms

4

Capacitor charging

turns

11 - 12 crank turns

Capacitor nominal value

µF

82

Capacity (2,5Ω , Class 1 detonators)

caps

200

Line resistance testing

Yes/No

3 separate LEDs for Class 1,2,3 detonators

Maximum line testing current

mA

1

Power supply

Hand cranked

Protection level

IP65

Operating temperature

°C

–25 to + 55, at 100% relative humidity

Weight

kg

0.78

Dimensions

mm

142 x 125 x 45