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MARS-3

Blasting Machine with Digital Ohmmeter

Blasting machine MARS-3 is designed to explode electric detonators and control the electric resistance of a successive switch blasting line in a safe manner.

The integrated ohmmeter 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 1mA. Three digit LED display helps to safely control the blasting line of the electric detonators.

MARS-3 includes output pulse tail cutting to limit the output pulse to 4ms and quench the remaining capacitor charge. These safety features are necessary to eliminate potential secondary explosions of the flammable dust generated during the blast.

MARS-3 can be used to explode class C1, C2 and C3 sensitivity electric detonators. For C1 detonators the total line resistance can be up to 450Ω.

The electric unit and the batteries are housed in a plastic body. The ohmmeter display, membrane switches, low battery indicator and capacitor loading signal lamps are on the front panel of the device The connection terminals for the blasting line are on the top.

Features and Benefits

  • Built-in ohmmeter with digital 0-999Ω reader

  • Battery level indicator LED

  • Short 4ms output pulse

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Technical Specifications

Metric

Units

Value

Line resistance, max

Ω

450 (for class C1 detonators)

180 (for class C2 detonators)

36 (for class C3 detonators)

Firing voltage

V

500

Firing energy

J

8.5

Firing impulse duration

ms

3.1-3.9

Capacitor charging

s

8 - 15 (depends on battery)

Capacitor rating

μF

68

Capacity (in 2.5Ω caps approx.)

caps

180

Blasts per battery change

blasts

500 - 1000 (depends on battery)

Line resistance testing

Ω

digital ohmmeter up to 999

Testing current (max)

mA

1

Power supply

V

3 x 1.5V AA batteries

Protection level of machine body

IP67

Operating temperature

°C

–15 to + 50 at 100 % relative humidity

Weight

kg

0.34 (with batteries)

Dimensions

mm

170 x 88 x 33