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Summary

The Sentry will monitor sound levels and provide a trigger when a set sound level has been exceeded

for about 20 seconds, typically the trigger will be used to operate a contactor.

In an audio application (music) the Sentry will normally be used where performers bring in their own

equipment, the mains power supply for this equipment will be put under the control of the Sentry by

means of a mains contactor. Where mains power is to be controlled the mains ring(s) are identified

and a contactor(s) are installed (by a qualified electrician) to control those rings.

In an industrial application the Sentry may be used to indicate ear defenders are required or remove

power to a piece of machinery, An "A" weighting filter will often be used in this situation.

The Sentry should be mounted on a solid wall, away from doors and opposite the source of the

sound. The display should be visable to performers or machine operators. If the Sentry cannot be

mounted on a solid wall away from doors then an external microphone can be used.

Two levels may be set (eg day and night or weekdays and weekends may require different levels),

switching between levels may be done by switch, keyswitch or timer.

There is a choice of filters, for music either Linear or Bass will be used (Bass tends to travel and

therefore is a greater cause of noise nuisance) and for industrial "A" weighting should be used.

The fire alarm interface allows the Sentry to be interfaced with the fire alarm. The security loop may

be used to trip the system if fire doors are opened.

Adding a Formula Sound AT1 to the Sentry can allow the music level to be controlled providing the

music can be routed through the AT1 beofre going to the amplifiers.

A simple method of setting the level for a music venue is to play music at the maximum allowable

level (ensure speakers are where visitors will place them), the maximum allowable level is

determined by the environmental health officer but will typically be either a level just audible in a

neighbours premises or a set level at the boundary of the premises.

With the music at the maximum allowable level adjust the Sentry (Adj 1) to be between "warning" and

"Over limit" on the display.

Note: Reducing the amount of sound escaping from a venue will generally increase the sound level

the venue is allowed to operate at, doors, windows, direction and mounting of speakers all affect

sound levels from a venue.

FORMULA SOUND LTD.

UNIT 23; STADIUM BUSINESS CENTRE

NORTH END ROAD

WEMBLEY

MIDDLESEX

HA9 0AT

TEL: 44 (0) 208 900 0947

FAX: 44 (0) 208 903 8657

Email [email protected]