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• Specification & Concept

  Tom • 04/16/2024 at 02:16 • 0 comments

  Specification

  • supplied with a battery (2CR5 or CR-P2)
    these are long-lasting lithium primary batteries
  • type A: 10 pieces
  • type U: 10 pieces
  • > 1 J (~1Ws) of energy (e.g. 330µF at 80V, 220µF at 100V)
  • testing current 1mA
  • ohm-meter functionality
  • (self-test, check firing pulse on internal or external load)

  Block Diagram

• Legal, Norms, Regulations

  Tom • 09/18/2023 at 19:22 • 0 comments

  GERMANY: 1. SprengV Amendment 1

  Blasting machines

  • mechanical requirements
    • The blasting machine must work reliably
    • The blasting machine must have a robust and closed enclosure
    • All parts of the blasting machine must be undetectable
    • The design must complicate unauthorized operation
  • electrical requirements
    • The blasting machine must have massive connection terminals. They must not be hollow and the diameter must be a minimum of 4mm. Protection against touching electric shock must be given.
    • Between the terminals there must be an isolation barrier that overtops the connection surface for at least 8mm.
    • Isolation between electrical parts and the housing must be at least 1000V or the double working voltage.
    • Isolation parts must comply with the state of the art
    • Capacitor blasting machines have to ensure that the capacitor is discharged after blasting.
    • An interlock must ensure that triggering is only possible if the full electrical power (energy) is available.
  • performance
    • type A
      • After 1ms the current must reach at least 1A. From the beginning until falling below 1A, the impulse must be at least 4mWs/Ω.
      • limiting resistance

        10 ignitors	60Ω
        20 ignitors	110Ω
        30 ignitors	160Ω
        50 ignitors	260Ω
        80 ignitors	410Ω
        100 ignitors	510Ω
        160 ignitors	810Ω
        200 ignitors	1010Ω

    • type U
      • After 1ms the current must reach at least 2A. From the beginning until falling below 1.5A, the impulse must be at least 18mWs/Ω.
      • limiting resistance

        10 ignitors	55Ω
        20 ignitors	90Ω
        30 ignitors	125Ω
        50 ignitors	195Ω
        80 ignitors	300Ω
        100 ignitors	370Ω
        160 ignitors	580Ω
        200 ignitors	720Ω

    • type HU
      • After 1ms the current must reach at least 30A. From the beginning until falling below 15A, the impulse must be at least 3.3Ws/Ω.
      • limiting resistance

        20 ignitors	15Ω
        80 ignitors	50Ω
        160 ignitors	100Ω

  • other requirements
    • In regard to protection against firedamp the blasting machines must comply to the state of the art.
    • The ignition current pulse must not be longer than 4ms. After triggering the recharging of the capacitor, triggering a second pulse must be impossible.

  Blasting circuit continuity tester

  • general requirements
    • The current source must not be accessible
    • The voltage of the current source must be lower equal 12V
    • The test current must be less than 25mA
    • There must be protection resistors to limit the current in a single failure case to 50mA
  • special requirements for Ω–meters
    • The accuracy must be 1.5% of the full range
    • The zero point should be regulated
    • A 10% deviation of the current source voltage must not influence the measurement accuracy

  AUSTRIA: Regulation for blasting for mining

  Very similar to the GERMAN version.

  • Between the terminals there must be an isolation barrier that overtops the connection surface for at least 8 10mm.
  • A performance sheet must be on the housing
    • type description
    • manufacturer and manufacturing site
    • site number
    • manufacturing date
    • limiting resistance
    • blasting voltage and capacitor capacity

  US: eCFR / Title 30 / Chapter 1 / Subchapter K / Part 56 / Subpart E / Electric Blasting

  • Shunting
    Except during testing —
    • Electric detonators shall be kept shunted until connected to the blasting line or wired into a blasting round;
    • Wired rounds shall be kept shunted until connected to the blasting line; and
    • Blasting lines shall be kept shunted until immediately before blasting.
  • Firing devices
    • Power sources shall be capable of delivering sufficient current to energize all electric detonators to be fired with the type of circuits used. Storage or dry cell batteries are not permitted as power sources.
    • Blasting machines shall be tested, repaired, and maintained in accordance with manufacturer's instructions.
    • Only the blaster shall have the key or other control to an electrical firing device.
  • Circuit Testing
    A blasting galvanometer or other instrument designed...

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• Competitors

  Tom • 09/11/2023 at 11:28 • 0 comments

  BB-75 Blasting Machine

  • 320V @ 10Joule (75EBCs)
  • test circuit 800µA; tactile and optical feedback when continuity
  • supply is a 9V battery
  • 89m x 165mm x 30mm; 326g
  • fuse protected test circuit
  • shunted output for EMI protection
  • ABS case with rubber boot
  • shock and weather resistant
  • MSHA conform

  DG2plus Ohmmeter

  • Autoranging (10Ω, 100kΩ, 10kΩ)
  • activated with test button, power-off 15s after load removed
  • testing current 1mA
  • non sparking brass contact
  • supply is a CR2477 battery
  • 48mm x 89mm x 30mm; 74g
  • completely sealed (IP65)
  • ABS case with rubber boot
  • low battery indicator

  Euroblast X1

  • 175mm x 85mm x 43mm; 500g
  • 7.4V lithium ion battery; 2200mAh
  • 640V / 46Ws / 220µF
  • charge time 50 to 70 seconds
  • ignition delay 160ms
  • type A: 4mJ/Ω; total impedance 580Ω; 3m Cu 230 pieces
  • type U: 20mJ/Ω; total impedance 270Ω; 3m Cu 149 pieces
  • type HU: 3.3J/Ω; total impedance 12Ω; 3m Cu 4 pieces
  • BAM?

  RhinoFire Stepper

  • supply 9V battery
  • test current 15mA
  • ignition current 3-6A depending on battery voltage
  • 69mm x 147mm x 25mm

  Pocket Blaster

  • 250V / 2x 220µF / 13.75J
  • charging time 18s (new battery)
  • 9V battery
  • 82mm x 160mm x 42mm; 350g
  • BAM-ZM-456
  • type U: 20 pieces; 90Ω
  • type HU: 3 pieces; 3Ω
  • -15°C → +50°C

  MICKO 1 dual

  • 450V / 40J (Ws)
  • 100mm x 175mm x 50mm; 850g
  • 4x AA battery
  • inner protection resistance 1Ω
  • -10°C → +55°C
  • type A: type U: type VA: type HU:

  DEX C2-55

  • 58mm x 155mm x 52mm; 595g
  • aluminium housing
  • -33°C → 66°C
  • 180V / 660µF / 8.58J / charging time 15s
  • measurement resolution 1Ω
  • ranges 10Ω / 300Ω
  • accuracy 10% / 1%
  • 4x CR123A battery
  • ignition delay ~250ms

  HZG hybrid 17J

  • 380V / 17J
  • -33°C → 63°C
  • 58mm x 155mm x 52mm; 595g
  • aluminium housing
  • waterproof 7meter / 1h
  • battery CR123A
  • military approved

  HUMMIG Pocket Ignitor

  • 6V / 6A
  • 4x A/U parallel
  • 3x A/U series
  • 10 years battery life (Lithium)

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