ARBRABEETHOVENSHOT FIRING EXPLODERS

• Safe

• Robust

• Reliable

• Hand generated power

BeethovenShot firing exploder

ARBRA Instruments

Arbra Instruments have been specialist manufacturers of shot firing exploders since the early 1940’s.

The Arbra trade name ‘Beethoven’ is famous throughout the mining and quarrying industry for quality and reliability,All exploders manufactured by Arbra are used to ‘fire’ electric detonators which are used in series to initiate high explosive charges.

The exploders may be used to fire a single detonator (i.e. nonel system) as well as a circuit of detonators connected in series.

The exploder provides enough energy to start all the detonators before the circuit is broken by the explosion.

Arbra exploders are available for detonators in the range0-13 Amps in several different models. These exploders are one of a range of products manufactured by Arbra Instruments and our sales office would be delighted to help you select the most appropriate one for your application.

Arbra also offer a range of blasting accessories including an Approved Ohmmeter for use in ‘Permitted Areas’.

AS PART Of The ARBRA POLICy Of CONTINuINg PRODuCT DeVeLOPMeNT We ReSeRVe The RIghT TO AMeND SPeCIfICATIONS WIThOuT PRIOR NOTICe.

SpecIfIcATIOn

Approved

Built in Ohmmeter

Automatic firing

5ms cut off

Weight Kgs

Minimum capacitance (μƒ)

Maximum fire voltage (Vdc)

Maximum internal series resistance (Ohms)

Maximum charging time (Sec.)

Minimum fire charge (Joules)

Maximum time to be safe

after firing button released (Sec.)

Maximum Ohmmeter test current (mA)

Ohmmeter Resistance Range (Ohms)

MK7

Yes

Yes

Yes

Yes

5

9.5

950

111

3

4.3

1

1

0-1999

MK8

Yes

No

Yes

Yes

4

9.5

950

111

3

4.3

1

-

-

MK19

No

No

Yes

Yes

4

9.5

780

62

2

2.9

1

-

-

MK21

No

No

Yes

No

4.5

19

950

9.4

4

8.6

1

-

-

MK22

No

No

Yes

No

4.5

28.5

950

9.4

7

12.9

1

-

-

MK22/3

No

No

No

No

5

28.5

950

9.4

7

12.9

1

-

-

217mm

275mm

94mm

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 cables from damage.

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.

Warranty

All Arbra exploders are covered by a 12 months warranty.

MK 7 & MK 8 exploder

These exploders are approved for underground use and will initiate up to 100 standard electrical detonators connected in series.

The MK 7 has an integral digital ohmmeter which is used to measure the total circuit series resistance. The ohmmeter is also powered by the hand generator.

MK 22/3 exploder

This exploder uses manual firing of the round with a separate firing button. The shot-firer has total control on when he sets off the detonators.

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.

BeethovenShot firing exploder

Arbra Instruments Advance Spares Limited, unit 21, Vauxhall Industrial estate, Ruabon, Wrexham, LL14 6hA, uK

Arbra Instruments, a division of Advanced Spares Limitedarbra.co.uk

T +44 (0) 1978 823900 f +44 (0)1978 822913 f sales@aslgroup.uk.com

DeTOnATOR cHARAcTeRISTIcS

firing Current Amps 1.2

firing energy mJ/Ohms 5

firing Current Amps 1.7

firing energy mJ/Ohms 15

firing Current Amps 6

firing energy mJ/Ohms 140

firing Current Amps 13

firing energy mJ/Ohms 1000

explODeR fIRIng cApAcITyMAxIMUM TOTAl cIRcUIT SeRIeS ReSISTAnce OHMS

MK7

390

120

n/a

n/a

MK8

390

120

n/a

n/a

MK19

250

50

n/a

n/a

MK21

615

335

40

n/a

MK22

665

390

60

5

MK22/3

665

390

60

5