PROJECT PROFILE Oil and Gas Development Yemen Siren Warning System PROJECT SUMMARY GAI-Tronics Corporation won the contract to design and install a Siren Warning System at a development facility in the Yemen. The initial request for quotation information provided was: “Electronic siren shall be supplied and installed at the top of the KHARIR tower. The siren shall broadcast a minimum acoustic pressure level of 135dBa in all directions and shall be able to transmit three different types of tones.” Further discussions identified the customer requirements as: · User selectable choice of broadcast alarm tones; · Redundancy of critical components; · Extensive equipment failure monitoring. GAI-TRONICS SOLUTION

GAI-Tronics Corporation supplied an Emergency Siren Alarm System that satisfied all the acceptance criteria set forth by the user. The basic architecture of the system is as a standard PA/GA layout comprising a Central Equipment Cabinet fitted with audio signalling and process cards and power amplifiers interfacing to an omni-directional sound emitter (siren). The plant alarms are manually initiated from local and remote MONITOR TEST PANELS provided. The system can provide a user selectable choice of any 3 of 8 broadcast tones: · DUAL TONE WAIL · DUAL TONE ALTERNATE WAIL · DUAL TONE CHOPPED WAIL · DUAL TONE STEADY · DUAL TONE ALTERNATE STEADY · DUAL TONE CHOPPED STEADY · SIREN WAIL · WARBLE

G:\Project Profiles\Generic Project Profiles\Industry or Application\Oil and Gas\Siren Warning System Petrochem.doc 07/31/02

Designated alarms are: · INCIDENT ALERT ALARM · MAJOR INCIDENT ALARM · ALL CLEAR ALARM The INCIDENT ALARM and the MAJOR INCIDENT ALARM can also be triggered automatically from external equipment via voltage free contact inputs. SOUND EMITTER The siren cluster consists of vertically-coupled omni-directional cells offering superior performance to re-entrant horn arrangements. Coverage is over a genuine 360 degrees without gaps. The siren cluster output is 143 dB(A) at source with eight speaker cells stacked. This equates to 113dB @ 30m (100 ft). The slip-stream design also presents a profile virtually unaffected by high winds. The clusters are supplied pre-assembled and pre-wired for low cost installation. SYSTEM MONITORING The equipment cubicle incorporates automatic monitoring to provide an early warning of system malfunction and to provide immediate and convenient system status information to the maintenance personnel. Tests executed are: · Central cabinet equipment failure. All cards are self-monitoring with each card raising its own failure alarm; · Alarm tone failure; · Signal path failure. A 2kHz in-band tone is routed through the audio process circuitry during the system idle state; · Amplifier and siren failure. An ultrasonic sensing system is provided which monitors current flow through the power amplifiers into the siren compression drivers. Should the amplifier be at fault a HOT STANDBY unit is automatically switched into service to maintain siren coverage. EQUIPMENT USED A single 42U equipment housing: a) System control cards and mimic display panel b) 4NR 400W slave power amplifiers c) INR hot standby power amplifier d) Hermetically sealed line switching relays e) Maintenance test panel f) 48V 90Ahr battery and charger unit g) MCB fuse distribution and power distribution

G:\Project Profiles\Generic Project Profiles\Industry or Application\Oil and Gas\Siren Warning System Petrochem.doc 07/31/02

G:\Project Profiles\Generic Project Profiles\Industry or Application\Oil and Gas\Siren Warning System Petrochem.doc 07/31/02

G:\Project Profiles\Generic Project Profiles\Industry or Application\Oil and Gas\Siren Warning System Petrochem.doc 07/31/02

G:\Project Profiles\Generic Project Profiles\Industry or Application\Oil and Gas\Siren Warning System Petrochem.doc 07/31/02