Formula Sound

Formula Sound Sentry MK2 Cut Off Sound Limiter, Contactor Not Included (073)

Name: Formula Sound Sentry MK2 Cut Off Sound Limiter, Contactor Not Included (073)
Brand: Formula Sound

The Sentry MK2 is the cut-off noise limiter most UK environmental health officers already know, and the one written into a lot of premises licence conditions. A microphone measures the sound level in the room; a bar display shows staff and the DJ how close they are to the limit, a warning lights just before it, and if the level stays over the limit the Sentry trips a contactor and removes mains power from the music system until someone resets it. It works with any PA, band or DJ rig because it controls the power, not the audio signal, and every adjustment sits behind a sealed cover so the level the EHO signs off is the level that stays.2 levelsThresholds · Switchable10 LEDDisplay · -20 to +3 dB4 weightingsLin · C · A · BassFire alarmInterface · Built inContactor not includedThe Sentry MK2 is the monitoring and display unit. It needs a contactor to switch the mains: the Formula Sound 071 32A contactor (single ring) is the matching part, or it can drive your own mains-coil contactor up to 60 VA, or use its isolated relay contacts. Installation should be carried out by a qualified electrician to BS 7671, and the Sentry itself must be powered from a supply the contactor does not control.FeaturesCuts mains to the sound system via a contactor when the limit is exceeded for a set timeTwo independent threshold levels, e.g. a lower limit after 11pm or when doors or windows are openLevel 2 selected by switch, time switch or door/window reed contacts, with a front-panel LEDLinear, C, A or Bass weighting, so low-frequency complaints can be targeted directly10-segment display from -20 dB to +3 dB, with WARNING and OVER LIMIT stagesFire alarm interface: voltage applied, voltage removed, contacts closing or openingSecurity loop trips the unit if broken, e.g. fire door reed switches, a fire alarm or an emergency cut-offMicrophone tamper circuit with front-panel LED; the unit trips if the mic is tampered withAdjustments under a screwed cover sealed with non-reusable security labelsExternal microphone input with selectable phantom power for a remote measuring micRemote LED outputs and remote reset input for the 074K or 074P reset boxesMains output (60 VA) for a warning lamp in the roomSpecificationsTypeCut-off sound level limiter (mains disconnect)Threshold range85 to 125 dB (Formula Sound product page), two levelsTrip delayAdjustable, factory set around 20 secondsWeightingLinear, C, A or Bass (jumper selected)Display10 LED segments: -20, -10, -7, -5, -3, -1, 0, +1, WARNING +2, OVER LIMIT +3 dBTrip outputsLow-voltage drive for 071 contactor (12 to 18 V DC, under 100 mA); switched mains up to 60 VA; isolated relay contacts (NO, NC on request)InputsExternal mic (dynamic, capacitor or electret, phantom selectable); fire alarm; security loop; level 2 select; remote resetRemote outputsMic tamper, level 2, warning and reset required LEDs; slave display terminalsResetManual, local or remote; powers up in the tripped statePower240 V AC approx. 1 A, or 120 V approx. 2 A (internally selectable)EnclosurePolycarbonate, grey with clear hinged cover, wall mountedDimensions (W x H x D)320 (incl. hinges) x 261 x 120 mmIn the boxSentry MK2 unit, security labels. Contactor not includedPart number073Show more

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