|The Sentry has been designed to help solve some of the environmental noise problems
encountered in entertainment venues and working areas. The Sentry has connectors provided to interface with a range of equipment, plus internally
selectable options to make the system as versatile as possible. Although its main application
is to control mains power outlets in entertainment venues it is not restricted to this
application. Basically any function that can be controlled by a relay or switch can be
controlled by the Sentry. These may include disconnecting loudspeakers, switching passive
attenuators to reduce system volume or acting as the trigger into an active attenuator system. It is microphone driven and has its own microphone built in to minimise tampering. The Sentry also incorporates the facility to operate at two different sound level thresholds which may be selected manually, by a remote key switch or similar, or automatically by a time switch (switches not supplied). This allows a venue to operate at different levels at different periods of the day. e.g. when near offices or shops. An integral timer is available as a cost option.
New features on the MK2 version:
The bar graph meter is colour coded from green to red, and indicates the volume level in the venue. The red section increases in size to aid viewing. While the meter is operating in the green section, with even an occasional peak into the red, there is no cause for concern. If the two red "WARNING" segments are lit this indicates that the volume level in the venue is nearing the permitted limit. A connector is provided so that a mains powered warning lamp or beacon can be connected which operates at the same point as these two red sections of the meter. This lamp or beacon may be situated in a remote position.
If the noise level is high enough to light the "over limit" section (3 red segments) of the meter, the noise has exceeded the permitted limit. If this is allowed to continue the unit will trip and remove the power to the contactor. Visual indication is provided by the lamp adjacent to the re-set button labelled "Power off". The unit must then be re-set manually in order to restore power.
The unit has its own internal microphone and can be easily adjusted to operate at different levels. A remote reset switch can be connected to the unit, via the auxiliary connector.
An optional 32 amp, fully fused, boxed contactor with low voltage interface is available. Added benefits are the extra safety and possibly lower installation costs stemming from the fact that only low voltage cable is required as a connection to the Sentry.
Alternatively 220/240V AC is available from the Sentry to interface with 220/240V contactors or relays.
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