Address:

Englo LLC

Akadeemia tee 21/1

Tallinn 12618

Estonia

Contact:

Tel: +372 670 2444

Email: info@englo.ee

www.englo.eu

Sign up today to get the latest news about our products and offerings

ERNA-5

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 

Similar Products

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

Capacitor nominal value

µF

82

Capacitor charging

turns

11 - 12 crank turns

Firing impulse duration

ms

4

Capacity (2.5Ω, Class 1 detonators)

caps

200

Line resistance testing

Ω

0 - 999

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

0.79

Dimensions

mm

142 x 125 x 45