Hand Generated Exploder
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| 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 | - | - | - | - | - |
Exploder Features
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.
The table below describes the recommended circuit resistance which can be successfully fired with the Arbra Beethoven range of Exploders. These figures assume bottom limits for the exploder and detonator manufacturers published figures for 99% firing success.
MK7 Exploder
The exploder will initiate1-100 standard electrical detonators connected in series.
The d.c. voltage required to initiate the detonators is supplied by a hand operated generator which charges a capacitor to 950 Volts.
The mk7 has an integral digital ohmmeter which is used to measure the total circuit series resistance.
The ohmmeter is also powered by the hand generator.
MK8 Exploder
The exploder will initiate1-100 standard electrical detonators connected in series.
The d.c. voltage required to initiate the detonators is supplied by a hand operated generator which charges a capacitor to 950 Volts.
MK19
The d.c. voltage required to initiate the detonators is supplied by a hand operated generator which charges a capacitor to 780 Volts.
MK21 & MK22 Exploder
The d.c. voltage required to initiate the detonators is supplied by a hand operated generator which charges a capacitor to 950 Volts.
MK22/3 Exploder
The d.c. voltage required to initiate the detonators is supplied by a hand operated generator which charges a capacitor to 950 Volts.
When the neon indicator lights the exploder is fired by pressing the fire button.
Accessories
A range of ohmmeters for circuit testing including an approved version for use in permitted areas.
A range of energy testers suitable for testing each of the Arbra beethoven range.
Also available,a range of hand held, battery operated exploders.
Construction
Manufactured in a robust Noryl moulded case. They are completely water and dust proof. A unique feature of the case is the inclusion of sliding billet terminals. This feature makes cable connection especially easy and prevents the cablees from damage.
Warranty
All ARBRA exploders are covered by 12 months warranty.