SENTRY USER MANUAL - NoiseMeters Support
Contents
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3. drawing Drg No 879 giving full connection details Setting The Permissible Volume Level Adjustment of allowable noise level is made by adjusting the pre sets ADJ 1 and ADJ 2 These are located beneath the removable cover at the left hand end of the unit They are 10 turn pre sets to provide fine adjustment ADJ1 sets the normal operating level ADJ 2 sets the level for a second threshold which can be initiated remotely An indicator on the front panel will show when level 2 is selected Take care when making adjustments and use a small screw driver Try to make adjustments when the noise level is displayed on the bar graph meter as you will be able to see the changes displayed on the meter The adjustment pre sets have a slipping clutch at the end of travel to prevent damage But this can cause confusion if the pre set is at the end of travel as it then appears to do nothing this is not usually a problem once you know about it Page 5 Setting The Permissible Volume Level continued The actual sound pressure level SPL at which the unit operates can only be determined by measuring the noise level using a calibrated sound pressure level meter and adjusting the unit accordingly Alternatively the unit may be adjusted using trial and error but this should be used only asa temporary measure or last resort Measuring the sound level and setting to a limit agreed with the local area official is the only recommended method An internal measur
4. more sensitive in the mid 500Hz 5kHz region It is selected by placing the weighting response selector in the top position Where this option is fitted the Bass weighting filter is replaced by the A weighting filter Sentry units supplied with this option will have been re labelled as A instead of Bass on the PCB C weighting and Linear response are still available by using the weighting response selector See Drg 879 Section D REMOTE RESET SWITCHES 2 types of remote reset switch are available a push button version and a key switch version for extra security Both types feature a surface mount box 65mm X 65mm X 45mm depth They are fitted with led s to indicate Warning and Reset Connections are the same for both types SENTRY RESET SWITCH TERMINAL INFORMATION CONNECT TO SENTRY USING SIGNAL CABLE CURRENT IS MINIMAL 7 0 2MM IS IDEAL 6 CORE RS 365 587 LED COMMON VE RESET REGUIRED LED VE WARNING LED VE RESET SWITCH VIEW FROM TERMINAL SIDE OF P C B
5. on warning lamps or illuminated signs advising the use of ear defenders when the safe noise level is exceeded It is microphone driven and has its own built in microphone The Sentry 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 The Sentry is provided with connectors to interface with a range of equipment plus internally selectable options to make the system as versatile as possible Our technical department is always on hand to advise when unusual applications are encountered Page 1 Operation The Sentry features a large bar graph VU meter with 23dB range to give a visual indication of the noise level in a venue This has the advantage over other units in that anyone can see the volume level and can see how their actions are contributing to this level While the meter is operating in the green section with even an occasional peak into the red there is no cause for concern The Sentry will operate within the range 80dB 120dB and may be pre set to anywhere in this range Provision is included to operate at 2 different levels for instance at different times of day This selection can be performed manually or automatically by a time switch Afront panel indicator shows when level 2 is selected If a mains warning lamp is connected it will operate at the same point as the two red secti
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7. SENTRY MK2 USERS MANUAL Sentry MK 2 ENVIRONMENTAL NOISE CONTROL SYSTEM INSTALLATION INFORMATION K2 The Sentry MK2 basically performs the same functions as the original Formula Sound Sentry but with added features and options New case design provides easier connections via cable entry knock outs and screw terminals e Achoice of internal microphone supplied factory fitted as standard or external microphone may be selected e Removable cover provides access to all connectors and settings Anti tamper seals are provided e Anti tamper microphone circuitry is incorporated with a front panel indicator e Dual mains voltage operation is standard internally switchable General Detail The Sentry was designed to help solve some of the environmental noise problems encountered at entertainment venues and in working areas The unit was designed to be as versatile in use as possible and features a large bar graph display 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 The Sentry may also be used as a stand alone display unit indicating sound pressure levels or in industrial applications to switch
8. Therefore a band or D J may need to turn off amplification equipment to protect loudspeakers before the power is restored Mic Tamper An anti tamper circuit is incorporated which if enabled will detectthe presence of tape etc placed on the case above the internal microphone in an attempt to artificially raise the internally set threshold To enable this function adjust the T S preset X on Drg 879 turn the pre set to approx the 11 o clock position External microphones being disconnected will also be detected by a seperate circuit A front panel indicator will show MIC TAMPER The Sentry will switch off if the Mic tamper or Security loop indicators are illuminated All connections and adjustments are located beneath the removable cover plate None reusable security labels are supplied with each unit to help ensure that unauthorised tampering is detected Timer The period of time that noise over limit is tolerated before the unit trips outis variable over the range of 10 70 seconds A pre set is provided to adjust this should it be necessary the factory setting is approx 20 seconds Page 2 Mounting Position The Sentry should be mounted on a flat solid surface preferably where it can be seen by the persons affected by its use D J band etc It should be located in a position where it cannot be tampered with e g a minimum of 8 feet 2 5 meters from the floor ideally on a wall facing the noise source Itis not nece
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10. d Due to the action of the circuit you may have to wait up to 70 seconds for the timing capacitor to discharge before new timer settings will take place FORMULA SOUND LTD STUART ROAD ASHTON ROAD BREDBURY STOCKPORT CHESHIRE SK6 2SR TEL 44 0 161 494 5650 FAX 44 0 161 494 5651 Email info formula sound com www formula sound com Page 7 3NSSI 00 0 0 Alvd 43 09 379VAON 34 H1W3N398 031V907 628 ON 9404 SNOILdO ANY STVNIN43L 30 STIVLAG CMW AMLNAS SILL AN YSZ IUS IUIHSIHI LYOdMOOLS ANNAGSY VOY NOLHSV LS9S r t LOL v LS9S v6v L9LO XVA 0598 r r LOL vr OS9S Er 1910 TAL jueuysn pe napisuas Jade suoydouoiw euJa u Y sejoy Buyunouw woyog N yams ep Jojoajas fe A sjeuluule indu Sule L XeW SHEA 09 due ululem suiew e JO UONHISUUO9 SY JO SEU e JOJOB UOO 109 SUIEW JOOUUOD 0 SEU y JOJO8 UO9 S BJJOA MO JOSUUOD 0 S EUIWWAL y YO IMS Jasa ajo ua JOSUUOD 0 S BUILU N YOUIMS J0 09 9S Z Buet JOBUUOI 0 SJBUIUIIO L N KeldSIG age e ot NANO 7 Deen Jou JI YU uoy9auuo9 doot uno y 99 SJOJBIIPUI De euajxa JO UOISUUOI Y JO SIeulua f J0J93UUO9 YOIIMS 18594 H pajas 0 JA 235 jos ad juausn pe z pe e Jes aid juaunsn pe euuou awe y jes ed jusugsnipe Jeu 3 auoudouoiw Bumsesu 10j9ajas asuodsai Bunybiam 0 auoydoJo uu euJa xa JO Joes Jamod WOJUBU 9 SEU uonosuuoo BUOYHOJ
11. how to proceed you should seek help from a qualified electrician Overview The Sentry provides outputs to control a contactor or relay which in turn will control the mains supply This strategy allows the Sentry to be mounted in the most suitable position for noise measuring whilst the mains switching equipment the relay or contactor can be mounted in the most convenient position for switching the mains power fuse cupboard etc A 32amp fully fused boxed contactor with low voltage interface has been designed for use with the Sentry and is available from Formula Sound Ltd The extra safety and possible lower installation costs stemming from the fact that only low voltage cable is required between the Sentry and contactor at minimal current are added benefits The Sentry also provides connections to use a mains coil contactor with a maximum coil consumption of 60VA Page 4 Installation Select and install a suitable contactor arranging the installation to control all the power outlets in the vicinity If any are left uncontrolled it will not take very long for the enterprising band or D J to find and use them It is inadvisable to arrange control of only half the outlets in a venue In very large installations it is a simple matter to make 1 contactor control many others of whatever current rating is required Connect the contactor control back to the Sentry using appropriate cable and connections depending on the type of contac
12. ing microphone is fitted which will be suitable for most applications but should the need arise an external microphone can be connected The external microphone may bea moving coil type capacitor or electret Microphone phantom power is provided and may be selected as required Select a microphone with the required frequency response and polar response Please telephone our technical department if help is required NOTES If the unit is to be used in an entertainment venue to control a band or disco use a meter with either a linear scale or C weighting response The frequency response of the measuring circuit of the Sentry may be selected to be Linear Flat response C Conventional C scale or Bass LP filter 300Hz 12dB per octave slope See Drg No 879 A weighting is a frequency response curve that resembles the human ear response It is much more sensitive in the mid 500Hz 5kHz region It is not recommended for entertainment venues as it is less sensitive to the bass regions where most problems lie An A weighting filter may be fitted as a factory option if required SECURITY LABELS ARE PROVIDED THESE SHOULD BE FITTED TO COVER THE SCREW HEADS HOLDING THE REMOVABLE COVER IN PLACE AND WILL REVEAL ANY UNAUTHORISED ATTEMPT TO CHANGE THE THRESHOLDS ALWAYS FIT SECURITY LABELS AFTER ADJUSTMENTS HAVE BEEN MADE EXTRALABELS ARE AVAILABLE FROM FORMULA SOUND IF REQUIRED Remember that the acoustic characteristics of
13. n on the P C B External Microphone Phantom power Phantom power is available for capacitor and electret microphones two jumper plugs select in a similar manner to microphone selection Ensure both jumpers are moved and connected correctly Weighting Selection The position of one jumper plug selects the response on the measuring microphone The positions are shown on the P C B Ensure that the jumper is 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 and balanced and good quality twin screened cable should be used for the connections Select a microphone with the desired frequency response and directional characteristics 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 outis 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 require
14. ons of the meter These are labelled WARNING If the noise level is high enough to light the OVER LIMIT section of the meter three red sections the noise has exceeded the allowable limit If this is allowed to continue for more than the set time period the unit will trip and remove the power to the contactor or relay Visual indication of this is provided above the reset button When the unit is first powered up the RESET indicator will be lit wait for a few seconds and press the re set button The Sentry will now be re set and ready for normal operation The action of the timing circuit means that continually exceeding the limit even for short periods may eventually trip the unit The unit has to be manually reset to restore power and this will only be possible after a short time The reset time is determined by the amount by which the unit is driven over limit e g tripping the unit by just exceeding the limit will result in a short period of a few seconds before resetis possible Tripping the unit by grossly exceeding the limit will require a longer period before reset is possible NOTE It is important that a check is made before the unit is re set Check that it is safe to do so Audio systems generally need to be powered up in a specific order In an audio system comprising of different components amplifiers mixers etc a general rule is to switch power amplifiers off first and on last to avoid possible loudspeaker damage
15. remove the appropriate knock outs A small flat blade screwdriver on the perimeter of the hole will assist prizing out the blanking plugs Remove any sharp edges that may damage cables or use protective grommets not supplied NOTE Use a separate cable entry for mains connections Always keep low voltage cables away from mains cables and connections Fastening the unit The unit is secured to a wall by 3 screws not supplied The top centre screw locates in a key hole slot on the back of the unit Use No 10 or 12 screws with round heads 1 5 38mm minimum length Brick or masonry walls will require drilling and plugging in the usual manner First remove the cover to expose the bottom mounting screw holes these are located in the bottom corners of the case Fit the top centre screw 30 mm down from the required top case position leave this screw approx 1 5mm proud of the mounting face The unit may now be suspended on this screw while the two bottom mounting screw positions are marked out ensure that the unit is captive on the screw head so it cannot fall Fit the bottom two mounting screws Check that the unit is secure cannot fall and is not loose on the screws In high risk areas security screws should be utilised to prevent the unit from being removed Wiring For Applications Controlling The Mains Power All mains wiring must be installed in accordance with IEE Regulations If after reading these instructions you are not sure
16. ssary to have a microphone suspended above the band or dance floor Ifthe Sentry can hear the noise source above the background noise the unit can be calibrated accordingly Avoid positions that are too close to the noise source e g in a typical concert room with the stage area at one end the Sentry should be positioned centrally away from the stage at a minimum distance equal to the stage width Ifthere is more than one source of noise e g several instruments in a bandthe Sentry should ideally be at a position egual distance from each instrument see Fig1 Ideal Position Sentry From Floor level Fig 1 Distance A should never be less than distance W Poor Positioning VA SCH 2 a 7 ge 7 221 we A A Position B Be 7 A Sentry TEn EE 7 Wa Better position Poor position Z Fig 2 In Fig 2 the instruments y amp z will appear louder to the Sentry than instruments w amp x Moving the Sentry back away from the stage to position B will minimise the problem In order to help solve difficult location problems provision is now included to connect a remote microphone to the Sentry MK2 See Drg No 879 for more details Page 3 Cable Entry And Fixing Read this section fully before proceeding Customising the box Cable entry knock outs are provided on the rear and bottom faces of the unit using the rear cable entrys can result in a very neat installation Select the cable entry positions to be used and
17. tor used Connections All connections to the Sentry are located beneath the lower removable front cover On this cover is also mounted the reset button which connects to the printed circuit board via a 2 pin plug and may be easily disconnected See Drg No 879 for more details Connect the Sentry to a suitable mains outlet using the terminals labelled Mains In and ensure that the earth is also connected The mains consumption is approximately 1amp at 240V a 5amp lighting feed could be utilised Connect via an isolating switch or removable plug socket arrangement so that the unit can be isolated when necessary For use on 120V the consumption will be approximately 2amps ENSURE THAT THE MAINS SUPPLY IS NOT THE SAME AS THAT CONTROLLED BY THE CONTACTOR REMEMBER THIS SUPPLY CONTROLS ALL THE POWER OUTLETS CONTROLLED BY THE CONTACTOR Warning Lamp Provision to switch a mains warning lamp to a maximum of 60VA is provided The lamp can be of any style considered suitable but must have a maximum consumption of 60VA 60 watts Itis connected to the mains outlet terminals labelled warning lamp Alternatively a relay or contactor may be used to switch other lamps as required Good wiring practice should be observed Remote Reset Provision for a remote reset button is provided and if this facility is required a momentary action push button or key switch should be fitted Site this in a Manager s office or suitable location See separate
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