Hand Generated Exploder
Automatic firing is achieved by a two handed operation of depressing the fire button whilst turning the generator handle. If the fire button is released the charge on the capacitor is safely dissipated.
Manual firing is achieved by holding the charge button whilst a hand operated generator charges a capacitor to the required voltage, when the neon indicator lights the exploder is fired by pressing the firing button. The charge on the capacitor will be safely dissipated if the charge button is released. The exploder will only fire if the neon light is fully on.
Approved models are approved for use in underground mines where use of permitted explosives is required. Non-approved for use in all surface applications.
| Arbra Data Sheet | MK7 | MK8 | MK19 | MK21 | MK22 | MK22/3 |
|---|---|---|---|---|---|---|
| Approved | Yes | Yes | No | No | No | No |
| Built in ohmmeter | Yes | No | No | No | No | No |
| Automatic Firing | Yes | Yes | Yes | Yes | Yes | No |
| 5ms cut off | Yes | Yes | Yes | No | No | No |
| Weight kgs | 5 | 4 | 4 | 4.5 | 4.5 | 5 |
| Minimum capacitance (*10^-6Farads) | 9.5 | 95 | 9.5 | 19 | 28.5 | 28.5 |
| Maximum fire voltage (vdc) | 950 | 950 | 780 | 950 | 950 | 950 |
| Maximum internal series resistance (ohms) | 111 | 111 | 62 | 9.4 | 9.4 | 9.4 |
| Maximum charging time (sec) | 3 | 3 | 2 | 4 | 7 | 7 |
| Minimum fire charge (joules) | 4.3 | 4.3 | 2.9 | 8.6 | 12.9 | 12.9 |
| Maximum time to be safe after firing button released (sec.) | 1 | 1 | 1 | 1 | 1 | 1 |
| Maximum ohmmeter test current (mA) | 1 | – | – | – | – | – |
| Ohmmeter Resistance range (Ohms) | 0-1999 | – | – | – | – | – |