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Akadeemia tee 21/1

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ERNA-3

Hand Cranked Blasting Machine with Line Continuity Tester

ERNA-3 is a medium energy hand cranked blasting machine that comes with a built-in line continuity 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 a two color LED that indicates to the user whether the resistance of the line and detonators is below or above 380 Ω. For safety reasons, the line tester current is limited to 1 mA.

The device comes in an aluminum enclosure and includes ON or OFF/L-test switch, terminals for connecting the electric detonator line, red/green 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 two color LED

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Technical Specifications

Metric

Units

Value

Maximum permitted line resistance

Ω

380

Firing voltage

V

440

Firing energy

J

6.6

Capacitor charging

turns

9 - 11 crank turns

Capacitor nominal value

µF

68

Capacity (2.5Ω, 1. class detonators)

caps

150

Line tester

Two-color LED, testing point 380Ω

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

0.8

Dimensions

mm

142 x 125 x 45