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Security Loop

Provision to connect a security loop is provided. This may be required for fire doors/alarm or

emergency cut off etc. Magnetically operated reed switches of the type used in intruder alarms are

most convenient for this application on doors or a simple emergency switch. If this facility is not

required a wire link must be connected to allow the Sentry to work normally. (see Drg No 879). A

front panel indicator shows if the security loop is opened.

Tampering

If you find that you have problems with unauthorised persons security screws are available to

replace the cover retaining screws, a special key is also supplied for the fitting and removal of

these screws. Contact FORMULA SOUND sales office for more details.

Internal Settings

Several optional settings are available internally. These are shown on drawing Drg No 879.

Internal/External Microphone Selection and Phantom power

This is accomplished by the position of three jumper plugs on pin headers. Take care to move

jumpers and ensure that they connect correctly. The positions are shown on drawing Drg No 879.

Weighting Selection

The position of jumper plugs select the response on the measuring microphone. The positions are

shown on the P.C.B. Ensure that the jumpers are seated correctly.

Special weighting options are possible - contact Formula Sound for further details.

External Microphone connection

A 3 way terminal strip is provided for the connection of a remote microphone. The microphone

should be low impedance, balanced and good quality twin screened cable should be used for the

connections. Contact Formula Sound if you are unsure.

Led Indicators

Outputs are provided for remote led indicators: - MIC TAMPER, LEVEL 2, WARNING, RESET

REQUIRED. If more than two leds are to be connected they share a common terminal. Led current

limiting resistors are not required. Leds may be connected directly. These outputs are also sufficient

to drive a contactor with low voltage interface if required.

Timer Adjustment

The period of time that noise "over limit" is tolerated before the unit trips out is variable over the range

of 10 - 70 seconds. If adjustment is required locate the timer pre-set from Drg No 879 and adjust with

a small terminal screwdriver as required. You may have to wait up to 70 seconds for the timing

capacitor to discharge before new timer settings will take place.