Mikron STINGER Operation instructions

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STINGER
User’sOperatingManual
MadeinBulgaria

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Inordertousethedeviceforamaximumlongtimeandwithout
problems,aswell
astobeabletouseallofitsoptions,pleasereadcarefullythewhole
instruction
manualandobservethedirections init.
Thestandardsetof STINGER comprises:
-searchingframeof1x1m.
-monitorunitwith builtinaccumulators;
-automaticrechargedevicefor220 V;
-detailedinstructionmanualfor operation.
If any oftheseitemsaremiss ing,immediatelyinformus,orourautor ized
dealer
whereyoupurchasedyourdetector.
_"STINGER"isanimpulsemetaldetectorwith anLCD–Display,digital
andgraphicalpresentationof thelevelofsignalandparametersof
discriminationandworkingmodes,aswell asofthestateoftemperatureof
thestoragebattery;
_Full automaticbalancetogroundconditionswith memorizingandadapting
tothelevelandparametersofthebackgroundofsoilandtheirelimination
bythegeneralsignal.
_Reportingoftheinfluenceofearth magneticfieldanditsisolationfrom
thegeneralsignal
_Reportingofsidedisturbancesandtheirfull eliminationduringwork
_Possibilityfor workinpremisesandinproximitytoelectricnetworks–full
suppressionof 50 _zdisturbances.
_12 regimesofwork-6dynamicand6static-forcorrectlocalizationof
theobject.
_Modeofworkfor all metals.
_Three modesofdiscrimination-1for normalsoil,1for soil with high
mineralization,and1forhighmineralizedsoilswith changingbackground

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withinwideranges+outerdisturbances.
_Choiceof2typesofsoundindication-VCO(multi–frequency one)or
two-tonalindication,lowtoneformagneticandhightonefor non–
magnetic(non-ferrousmetals).
_Built–in storagebattery,providing10-20 hoursofconstant work
dependingonchosenpower
_Automaticchargeof thebattery–measuringofchargedcapacity and
trackingoftemperatureduringcharging;
_Trackingof thecapacityofthestoragebatteryandautomaticsignaland
turningoffatachievingofacriticalminimum.
_Possibilityforsettingofover30workingandserviceparameters
providingcomfortableandeffectiveworkundervariousconditionsofwork.
_Possibilityfor quickandeasyaccesstoallsettingsinthemenu;
_All thesepossibil itiesallow„STINGER“toworkperfectlyunderany
groundconditions,includingathighmineralizedandpollutedsites!
„STINGER“hasthefollowingpartsfor control:
Switcher"ON–OFF"for turningonandturningoff
Buttons"SELECT","_and_"servefor workwith themenu andthesettings,
selectingofamodeof discriminationandmotion.
Button"CLEARGND"–servesforautomaticsettingofthedevicetoground
conditionsofterrainwhereitworks.
Button"MODE"—usedatthemodesofdiscriminationandservesfor
momentaryswitchinginto„ALL METALS"modeforpreciselocalizationof
objectwithoutlosingofthevalueof memorizedbalancetothegroundin the
discriminationmodes,aswell asforbalancingtotheconditionsofthesoil
throughpressingandholdingofthe"MODE"andmomentarypressingof
"CLEARGND"

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-Button"DISCR"–servesforturningonandoffofthediscrimination
modes.
1.Settingandwayofwork:
Searchingframeisassembledandisplacedonthegroundpayingattention
totherangeandtheredon'thavetobeany metalobjects.
Thecableissub-connectedtothedevice.Thedeviceisturnedon by"ON–
OFF"andyousee „Start Detector“onthedisplay.Nullificationstartsand
balancingtogroundconditionsduringwhichtimethedisplayshows"CLEAR"
andyoucanhearasinglesound. Thislastsfor 3–4sec.,thenitisfollowed
byadoubleshortsoundandthedeviceisturnedoningeneralmodeof"ALL
METALS".Ifyou wish toworkinamodeofdiscrimination"DISCR",theyou
havetopushthebutton"DISCR",atwhichthedeviceisswitchedinto
discriminationmodeandthedisplayshows"DISCR.1".Itsnextpushing
switchesagainthedeviceinto"ALL METALS"mode.
Workingwith thedevicein"ALL METALS"mode
Inthismodethedisplayshows"ALLMETALS".Constantlyshownaerthe
levelofsignalingraphicalanddigitallook,thecapacityofthestorage
battery,chosenpower,thelevelofco–workingofthesoundandthe
workingmode,as follows:
-1strowtotheright –capacityofthebatteryinpercent: 0%-100%
-2ndrowtotheright –chosenprofileofwork -"Prof1"or " Prof2".Atboth
profiles

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thedeviceworkswith different searchingcoilsor frames-" Prof1"–
programfor small roundcoils–28cm.36cm.45cm.or"Prof2"–program
for searchingframes–1x1mor2x2m.
-3rdrowtotheright –thresholdofsound,levelafterpassingofwhicha
soundappears
-4th rowtotheright –thelevelofsignalfromtheregisteredmetalin
figures–from 0
–400.Ifthereissignalof metalwithintherangeofthecoil,disturbancesor
influenceby soil,uponpressingof "CLEAR GND"indicationwillbecome"0".
Afterremovalofthesourceofthesignalfromthecoil range,indicationwill
becomeofnegativevalue.Inordertobenullified, youhavetopushagain
"CLEARGND".Uponpushingandholdingof"CLEARGND"formorethan4
secthedevicesisrestarted.
Thedevicecan workin12 modesofspeedofsearching–6static(forprecise
localizationofobject)-"FIX0"-"FIX5",and6dynamic(forsearchingwith
motion)–"MOV0"–"MOV5".
"FIX“arestaticmodesofsearching, i.e.,thedeviceconstantly reactstoa
metallocatedwithintherangeofthecoil.Theyaresuitableforlocalizationof
theexactplaceofanalreadyfixedmetal,andonemayconstantlyworkin
thismode.
Fastestoneisthe"FIX0"mode,andslowestoneis"FIX5".
"MOV"aredynamicmodesofwork withavariousspeedofsearching. The
differenceamongthesemodesisinthetimefor automaticnullificationof
appearedsignals,i.e.thedeviceisconstantlysetadditionally,but with a
variousspeedatindividualmodes.Fastestoneisthe"MOV0"mode,and
"MOV5"isslowestamongthedynamicmodes.Atthesemodesthedevice
reactstometalobjectswithintherangeofthecoil only atmotion ofthecoil
abovethem.
Onthe2ndand4th rowofthedisplaytotheleftgraphicalindicatorsare

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depictedofthelevelformorecomfortabletrackingofthechangesinthe
signal.
Indicatorscanshowpositiveor negativelevelsrespectively increasingtothe
right or totheleftfromthedividingzero point ofeachofthem.
Theindicatoronthe2ndrowisindicator ofthemomentarysignal.Ata"FIX"
modeitrepeatstheindicator ofthegeneralsignal.In"MOV"modeitonly
showsthechangein thesignal.
Theindicator onthe4th rowisanindicatorofthegeneralsignal.Itshows
thesummarysignalof thecoil without processing.
Normally,bothindicatorsshowpositivevaluesatapresenceofasignal,
afteritsdisappearancetheyshow"0"orhesitate (-1...0...+1).
Shouldwithinthecoil rangetherefallsinametalobject,itprovokesasignal
whichisdepictedonthe2ndleveloftheindicatorandofthedigital
indicationofthesignal.Shouldthissignalislouderthan thechosenthreshold
ofthesound"TRSa",asoundisheardwith afrequencywhichdependson
thelevelofthesignal.Themorelouderthesignal,themorehigherthe
soundfrequency.
Shouldthegeneralsignalbecomeshigherthan"90",levelindicatorsshow
">>>>>>>>",andthedigitalindicationcontinuestotracktheincrease,
thesoundisalsochanged.Ifthelevelofoverfillisachieved, hesoundis
changedtoaveryloudsignaltone,and„OVERFLOW“appearsonthe4th
rowofthedisplay.
3.Settingofworkingparametersin"ALL METALS"mode:
settingofthethresholdofco–workingofthesound"TRSa"–thisisthe
levelofsignalafterpassingofwhichasoundisheard. Thedevicemaybeset
atsuchstrength ofsignaltoreactwithsound. Thisisdonewith changein

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theparameter"TRSa".For thispurposethearrowismovedthrough
"SELECT"tobeagainst„TRSa"andthroughthebuttons"_and_"desired
valuecan bechosen.Forendyoupress"SELECT"andthearrowgoesdown
againonthe4throwforchoiceof"FIX"or "MOV"modes.Thelowerthe
valueof„TRSa",thegreaterthesensitivity ofthedevice.For instance,ifata
balanceddevicetheconstantsignalfromsoilis"1"andwehavechosenfor
"TRSa"avalueof"1",thenasoundsignalisgoingtoappearwhenthe
generalsignalbecomesgreaterthan"1".Ifforexamplefor "TRSa"avalue
of"6"has beenchosen,thenthedeviceisgoingtoreactwith soundata
considerablystrongersignal–valuegreaterthan"6".Greatervaluesof
"TRSa"can
beselectedifthegeneralsignalfromthebackgroundofsoil changeswithin
widerlimits,inorderthedevicetobecalm,aimingasoundsignalnottone
producedwhichisnotduetodetectedmetal,but thegreaterthevalueof
“TRSa”,themoresensitivityofthedevicedecreases!
-changeofworkingpower-thedevicecanworkwith different coilsor
frames"Prof1"isprogramforsmall roundcoils, Prof2“isprogramfor
frames1x1m.Or2x2m.
Selectionoftheoneorof theotherprofileisdonethroughpressingof
"SELECT"untilthearrowisfixedonthe2ndrowtotheright before"Prof"
andthroughthe"_and_"buttonsthedesiredcoil ischosen" Prof1"or "
Prof 2".
Itisnecessarytohaveitinmindthatateveryswitchingof“Prof1”or
“Prof2”thedevicerestarts,inordertodefineall workingparametersin
accordancewith thecoilchosen.
Incaseofdisbalanceyoushouldpush“GNDCLEAR”andthesearchcoil
shouldatthesametimebeclosetotheground.
4.Settinguptheworkingparametersin“DISCR”mode

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“STINGER”has3discriminationmodes-“DISCR.1”,“DISCR.2”and
“DISCR.3”,thatarechosenbypushingthe“SELECT”button,untilthearrow
pointsthediscriminationindication-1stlineandthe“DISCR”modeshould
beon.
Whendiscriminationison,besidesthesignalstrength twomorevalueslight
up C1 and C2,whichwhenaferrous(magnetic)metalisregisteredhave
negativevalues,andincaseofanon-ferrous(non-magnetic)metal–have
positivevalues.
“C1”isthevalueforchromaticityofmetal,and“C2”-isavalueforits
magnetism.
Mostoftenwhenanon-ferrousmetalisdetected C1 hasaverybigvalue,
e.g. +8+15,whilethevalueof C2 isaroundzero.
Whenfoil,aluminium andironthatisnotrusty, C1 and C2 havenegative
values,andtheirvaluesarebigandpositive,whenthenon-ferrousmetalis
pure,without alloys–gold, bronze,copper,silver.Whenahighlyrustediron
isdetected, C2 hasahighnegativevalue,e.g. -15-20,and C1 isaround
zero.

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C1 and C2 canhavedifferent valuesifferrousandnon-ferrousmetalis
present withinthecoilrange.
Thevalues C1 and C2 appearonlywhenmetalisdetected,andwhenthe
signalismissing,“TRSc”and“TRSd”light upintheirplace,as:
“TRSc”isthethresholdofsoundchangefromlowtohightone.Itexpresses
thevalueof C1,beforewhichthesignalisalowtoneandafterit-ahigh
tone.Forexampleif“TRSc”is 5 ,signalswith levelslowerthan 5 will be
registredwith alowtone,andincaseofsignalsexceeding 5,ahightonewill
beheard.Usually“TRSc”shouldbe 1 sothatsignalswithpositive“C1”are
registredwith ahightone,ornonferrous.
“TRSd”isthethresholdofsoundharmonisationindiscriminationmode.It
determinestheminimumrateofsignal,afterwhichthecalculationofthe C1
and C2 valuesbegins.The“TRSd”settinglightsuponthe3dlineatthe
rightsideandisanalogicalto“TRSa”.Smallervaluesof“TRSd”willensure
thebeginningofthediscriminationincaseofweakersignals,butthatcould
leadtomoreunstableindicationsor fakesignals.“TRSd”canchange
between5-20.
Thebalanceindicator“I-I”regardingthesoilbackgroundlightsuponthe
1stlineattherightsideandshowsif thedeviceisbalancedwhenthesignal
ismissing. Whenthedeviceisbalancedandtherearenometalobjects
withinthereach ofthecoil,theindicatorshouldhavetwoequallevelstothe

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rightandtotheleftofthe“-”symbol.Ifthereisadifferencebetweenthe
twolevelsthedeviceshouldbebalancedagain,bypressingthe“CLEAR
GND”button.Thelevelofthetwocolumnsofthebalanceindicator shows
alsothepowerofthesignalfromthesoil.Thehigherthelevel,thestronger
thesignalandthustheoperatorcangetorientatedwhichdiscrimination
modetouse–whenthesignalisweak(lowindicatorlevel)itis
recommendedtoworkat“DISCR.1”,whetitisataveragelevel-
“DISCR.2”,andathighlevels(strongsignalfromthesoil)-“DISCR.3”
Whenthe“SELECT”buttonispushedatadiscriminationmodeand
movement ofthearrow(>)at1stline,thetypeofdiscriminationcanbe
chosen“DISCR.1”,“DISCR.2”or“DISCR.3”.
“DISCR.1”isanappropriatemodewhenthesoilbackgroundisdisparagingly
small anddoesnotsignificantlychangethesignal,receivedwhenametal
objectisdetected.
-Whenthesaltismoremineralised,ittransmitsasignalthatcanincrease
significantly,especiallywhentheframeisclosetothegroundsurface.The
highlymineralisedsoils,especiallyiftheyhavehighmoisturecontent,
additionallyincreasethetotalsignalanditcanhavehighvalues.Ifthereisa
non-ferrousmetalin thistypeofsoil,itwillinverttheoverallsignaltomore
positivevalues,thusthesensitivitywilldecreasebecauseofthesoil
background.
-Forcaseslikethatthe“DISCR.2”modeisappropriate,wheretheaverage
backgroundlevelsareassumedtobeequaltozeroandeachinstant increase
ofthesignaldetectedfromametalobjectwill besignalised.
Thesensitivityatthismodeisgreater,becausethesignalappearsbeforethe
soilbackgroundistotallycompensated. Forexampleifthesoilbackground
is“C1=-7”,incaseofincreasingto -6,-5 thedevicewillmakeasignal,
whileatanormaldiscrimination,thesignalshouldincreaseover0,inorder
for asoundsignaltoappear.
Somewhataflawofthismodeis,thatitcangiveasignalwhenevenwhena

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ferrousmetalisdetected, with itsowncoefficient,morepositivethan thatof
soil.For exampleifthesignalfromthesoilis -7,andthatofmetalis -3,
thedevicewillmakeasoundsignal.Inthiscase,thevaluesof C1 and C2
shouldbeobserved,andthustheoperatorcanmakeaconclusionregarding
thetypeofthemetal.
-Inthe“DISCR.3”modethesignalisanalysedandincaseofchange,itis
calculatedwhatpartofitisaresultoftheoveralsoil backgroundandto
whatextenditisaresultoftheimpactofanotherobject.Thusitis
calculatedwhatthesignalcomingfromtheobjectitself,itisclosetothis,if
thesoildoesnothaveitsownbackgroundoriftheobjectisintheair.For
exampleifwehaveasignalfromametalobjectwith itsowncoefficient
“C1=-3”locatedinsoil,thathas itsownbackground“-7”,atthismode
therewillbenosignal,becauseafterobtainingthesignalofthemetalfrom
thesoilbackgroundanditsdiscrimination,theresultwillbenegative(“C1=-
3”).Similartothe“DISCR.1”therewillbeasignalonlywhenthevaluesare
positive.Thedifferencebetween“DISCR.3”and“DISCR.1”isthatwith
“DISCR.3”thesignalfromtheobjectdoesnothavetocompensatethesoil
backgroundfullyinordertoreactwith sound.Fromtheoveralsignalthesoil
backgroundsignalseparatesandonlytheusefulsignalstays.If
discriminatednon-ferrousmetal,thedevicewillreactwith soundalthough
thesoilbackgroundcouldhavehighnegativevalue.Thesensitivitywith
“DISCR.3”ishigherthanwith “DISCR.1”butitisbettertouse“DISCR.3”
onsoilswithincreasedmineralizationandabackgroundchangingwithin
largelimitsandalsouponpresenceofouterdisturbances.
Oneshouldbareinmindthattheefficiencyofthediscriminationdepends
quiteonthesizeofthemetalobjectandthedepth itissituatedin thesoil.It
couldbe100% accurateforsmall andmiddle-sizedobjectssituatedonthe
surfacelayer(with depth approximately50-100 cminthesoil),upto50-
60% accurateforbigmetalutensil(1x1mforinstance)buriedat2-3min

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thesoil.Thatistosaythebiggertheobjectthedeeperitisburiedinthesoil
andtheharderitistobediscriminated.
Smallercoilshavebetteropportunitiesfordiscrimination.
5.Balancingtowardsthesoil backgroundindiscriminationmodes.
For adaptiontothesoil in“DISCR.2”or “DISCR.3”pressthe“CLEAR GND”
button.Onthefirstrowofthedisplayyouwill see “Getground”andthe
devicewillmakeacontinuedsoundforadaptationstart.Afterthatyoumust
bringclosethesearchcoiltothegroundsurfacewithintherangeofnormal
searchingdistances.
Thedevicesanalysesthereceivingsignalfromsoil.Afterthesuccessful
balancing,youwillhearaconfirmativedoubleshortsoundforsuccessful
balancingofthesoilbackground.Atthesometimesonthefirstrowonthe
right sideofthedisplayyouwillsee theacceptedbytheapplianceaverage
valueforsoilbackground,“gnd:-27”for instance.Thisvalueisconsidered
tobetheconditionalenvironment(“0”)ofdiscrimination.Thevalueof“C1”
becomes“0”andeverysignalwith morepositivevaluewillbesignalizedwith
highsound.Thenyoureleasethe“CLEARGND”button.
Iftheparametersofthesoilbackgroundexceedtherangeofthecurrent
chosenbackground,adaptationshallberestartedandthedevicewillmake
thatlongsoundagain.
Ifyoureleasethe“CLEARGND”button beforethesuccessfulbalanceof the
deviceyouwillsee “gnd???”-signalizationfor missingtoneanditwill
constantlyreleaseshortsounds.

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Ifthesoil signalvariesin widelimitsaconstant restartingofthesoil balance
ispossible.Inthatcaseyoushouldincreasetheacceptabletoleranceof
adaptationas youincreasetheparameter“ggt1”.In“DISCR.2”atthe2d
line“ggt1”willlight up.
“ggt1”is“Getgroundtolerancefor C1”. Bythemthepossiblerangeof
signalsischosenwhenitisbalancedtothesoilconditions.
For example:if asoil with coefficients„gnd: -10“ hasbeenmemorizedand
for „ggt1“ avalueof „3“ hasbeenchosen,thedevicewill eliminateonly
soils(ceramics,stones)with signalsfrom„gnd:-7“to„gnd:-13“, orthe
rangesofeliminationwillbe3unitunderand3unitabovethememorized
value „gnd: -10“.
Ifthevalueof„ggt1“ increaseto „10“, thedevicewill eliminatethesoils
signalsof „gnd:-20“to„gnd:0“, i.e.,therangeincreaseswith 10 more
unitsunderthememorizedvalueand10 unitsoverit.“ggt1”canchange
between“2-10”.
Ifaftersuccessfulbalancingduringsearchthesignalfromthesoil
backgroundfadesawaysufficientlyandgetsevenquieterthanthe
rememberedminimum asignalizationformissingbackgroundwillappear-
“gnd:???”Inthatcaseyoushouldeitherbringthecoilclosertothesoil
duringsearchorrepeatthebalancing.
-“DISCR.3”isthemodeinwhichonecansuccessfullyregisternon–
magneticmetalobjectsbetweenironitemsor underactivestonesandhighly
mineralizedsoils.
Inthiscase,if,forexample,anobject(stone,ceramics or someiron) has
beenmemorized,withownsignalof „gnd:-22“,thedevicewillnotreactto
any signalssmallerthan „gnd:-22“,andeachsignalgreaterthan „gnd:-
22“ will beregisteredwith sound, astheobjects„with morepositivesignal“
(from„-21“to„0“)willbesignalizedwith alowtone,andall positiveones–
with hightone.

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Whenlocatingametalobjectinthesoil duringsearchindiscrimination
modesthedevicemakesashortsoundwith onefrequency.Thatmakesit
hardertofindtheexactlocationoftheobjectinthesoilthanitiswith a
soundwith changingfrequency.Forthepurposeanopportunityisprovided
for transitorychanginginto“ALL METALS”modeforlocatingduring
discriminationsearch.Thisisdonebypressingandholdingthe“MODE”
buttonandonthedisplayyouwillsee “ALLMETALS”andthedevice
switchestoamodeofmulti-frequencysoundindicationfor theeasier
locatingoftheobject.Afterreleasingthe“MODE”buttonthedevicereturns
tothediscriminationmodeandthebalancesettingshehadbefore.If you
switchoff“DISCR”andgoto“ALLMETALS”modetheobjectcouldbe
locatedaswellbut afterthatwhenyouswitchonto“DISCR”againyouwill
havetoperformsoilbackgroundbalancingagainwhereas ifyoupress and
holdthe“MODE”buttonforlocatingthedevicekeepsthesettingsithad
beforethediscriminationmode.
Thediscriminationmode“MODE”couldalsobeusedfor balancingthedevice
tothesoilconditionsbypressingandholding“MODE”andtransitory
pressing“CLEARGND”.Normallywhenworkingindiscriminationmodethe
pressingof“CLEARGND”isnotmaintainedbythesoftware.
6.Thedetectiondepth dependsonthefollowing:
-size,shapeandlocationoftheobjectinthesoil.Thebiggerthereflecting
surfaceoftheobjectthedeeperitistobefound;
-soilcompositionandmineralizationlevel–thedrierandmorehomogeneous
thesoiltheeasieritwillbetoadaptthedeviceandforthedevicetodetect
deeper.Understones,drysandor inclayutensil,metalsareeasiertobe
foundthaninfreshlydugout ordampsoil.
-thelongertheobjecthasbeeninthesoil theeasieritwillbetobefoundas
aresultofthegoodcontactwith thesoil.
-typeofdetectingcoil.Thebiggerthediameterofthecoillthedeeperitwill
beabletodetectmetals.

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-operator’sexperienceandskills.
Youcandofieldtestsbyyourselfusingthedeviceifyouburydifferent metal
objectsindifferent depth but youshouldleavethem inthegroundforat
least3months.
Thusthetestresultswill bemorereliable.Youshouldmindthesoiltypeand
themoisturecompositioninit.Bestresultsarereceivedwhenthesoilisdry.
7.Chargingstoragebatteriesandindicationsfortheirstatus.
“STINGER”hasabuilt-instoragepackage 18V/2,3Ah,whichisableto
provide
10-20 hoursofworkingprocess withoutany interruptiondependingonthe
chosenpowerandthetypeoftheusedsearchcoil.Biggercoilsconsume
morepowerandthustheworkingtimeisshorter.
Theaccumulators'statusisshownonthefirstrowontheright aspercents
ofthecapacity(0%-100%).Whenthecapacity decreasesbelow 0% itwill
show“---”andiffullychargedbatteriesorifusingexternalsupplyingblock
with highervoltageitwill show“+++”.Ifitshows“---”ontheforth rowof
thedisplayitwill say“SIGNAL ERROR”.
Thechargingisautomaticandbeginswhenthedeviceis SWITCHEDOFF
andyouplugthechargerintothechargingjackofthebackpanelofthe
device.Thejackcageis“-”andthemiddleterminalis“+”.Duringcharging
onthedisplayyouwillsee transitoryandmaximumvoltageofstorage
batteries,theirtemperature,as wellas thechargedsofarcapacityandon
thelowerrowofthedisplay“Charging”.
Thechargingcontinuestill themoment whenthebatteriesreachtheir
maximumcapacitywhichalsoreflectsinincreaseinthetemperature.When
reachingtheirfullcapacityandincreaseinthetemperatureupto 40 C the

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chargingstopsanddownonthedisplayyouwillsee “FULL”.Atthesame
timethedevicewillstarttomakeshortsoundsignals.
Alwayschargedevice'sstoragebatteriesONLY withthepaired
chargerstoit.
Thus youwillpreventdamagesorconfusionbetween“+” and“-”
becausethe
useofotherchargersoradaptorsmayleadtoirretrievabledamages
inthe
batteries!
Possibleproblemsduringexploitationof “STINGER”:
1.Whenswitchingitonyoucannothearasound, thereisnoinformationon
thedisplay,noindicationthatthedeviceisswitchedon.Itmight indicate
for:
-storagebatteriesaredead(usuallyafteralongperiodoftime).Chargethe
batteries
with thecharger.Iftheproblemisnotsolvedcontacttheservice-station
(office)ofthecompany manufacturerorthelocaldistributor.
-theaccumulatorblockconsistsof15 elements 1,2V/2,2Ah connectedin
series.Ifjustoneofthemisdamagedtheconnectionbetweenthemwill be
destroyedandpracticallythedevicewillbeleftwithout powersupply.
2.Theworkingdepth issignificantlyshallowerthanthenormal.Itmight
indicatefor:
-storagebatteriescouldbedead–payattentiontotheshown%forthe
capacityof
thestoragebatteries.Ifitis“---”chargethebatterieswith theautomatic
charger.Ifyou can notsolvetheproblem contacttheservice-station(office)
ofthecompanymanufactureror thelocaldistributor.
3.Duringdetectionthedevicedoesnotworkstable,makesstrangesounds
whicharenotduetoametaldetection.Itmight indicatefor:
-irregularelectromagneticexternalinterruptions.

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-problemswith thecoilcable–disconnectedconductor,ashotcircuitorbad
connectioninthecoupling.
Itispossibleaftercontinuanceworkandmany timesofswitchingonandoff
thecable'scouplingtothejackboxthecontactbetweenthemtobe
destroyed.
Thereare2terminalswith sightholesinthejackofthebackpanelofthe
device.Put
somethingsharplikeaknifeorascrewdriverinthesightholesandmake
themwider.
Thusthecouplingwillfitbetterintothejackwhichwill improvethecontact
betweenthem.Itispossibleinthepresenceofsomekindof dirtylikedustor
moisturetocleantheterminalswith cotton-woolandalcohol.Ifyoucan not
solvetheproblemcontacttheservice-station(office)ofthecompany
manufactureror thelocaldistributor.
4.Thedeviceworksonlywith headsetandwhenworkingwith amplifieryou
cannothearasound.Usuallythathappenswhentheheadsetjackis
damaged.Inthatcasecontacttheservice-station(office)ofthecompany
manufactureror thelocaldistributortochangethejack.
5.Whenswitchingonthechargertochargethestoragebatteriesyouwill
see onthedisplay“FULL”.Usuallythathappenswhenthedevicewas keptin
thecoldandthebatterytemperatureisaroundorbelow 0C.Ifthe
microprocessor cannotdefinethebatteriestemperatureyoucannotstrat
thechargingandonthedisplayyouwill see “FULL”.Leavethedeviceina
warmpremiseandwaittill thetemperatureofthebatteriesincreasesupto
5-6 C.
Ifyoucannotsolvetheproblemcontacttheservice-station(office)ofthe
companymanufactureror thelocaldistributorand donotcharge with any
otherdevicesor ordinaryadaptors.
6.Batterieschargequicklyandafterthatduringtheworkingprocesstheygo

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deadquickly.Usuallythathappenswhenthebatteriesarereallyoldand
needreplacement.Contacttheservice-station(office)ofthecompany
manufactureror thelocaldistributorfor changeofthestoragebatteries.
TheManufacturer(trader)doesnotbearanyresponsibilityifyouusethe
devicein violationofthelaw,onarchaeologicalorforbiddenfor search
placesaswell as onprivatepropertywithout theknowledgeorthe
permissionoftheowner.
Protecttheenvironment andalwaysfill backintheholesyouhavedugged
out!
7.GUARANTEE
Thedetector ULF21 isofferedwith 2yearsofguaranteeofelectronics,labor
andmaterialsused, forharmswhicharenotcausedonpurposeor
irresponsibly.
Wecanupkeepyourdeviceafterperiodofguarantee ifitisnecessary.
8.Protectingyourinvestment
Oftendetectoristsaredisappointedwhentheirnewdetectorslowlybecomes
less andlessresponsiveandseemstohavelostsomeofitsoriginalpeak
performance.
Youcanhelpavoidthisfromhappeningtoyourdetectorbyfollowingthese
basiccareandprotectionguidelines:
_Operateyourdetector exactlyasrecommendedinthisOperatorInstruction
Manual.
_Thesearchcoilcableishard-wiredtothesearchcoil andprotectedbya
strainrelief.Itisveryimportantthatthestrainreliefremainsintactand
should never beadjustedortamperedwith.
_Keepcablesproperlywoundaroundthepolestemsandprotectthem
duringuse.
Floppy,pinched, or cablesthatbecomesnaggedduringusemayshort,
causingerraticnoisesorunnecessaryreplacementofthesearchcoil.

MDETECTORS.COM MDETECTORS.COM
_Sweepthesearchcoilcarefully,especiallywhenusingaroundrocksand
buildingfoundations.Avoidhittingthesearchcoilagainsthard, solidobjects
andsurfaces.
_Keepyoursearchcoilslightlyoff ofthegroundduringthesweep,
especiallywhenusingingravelor hard,rocky dirt.
_Removeandcleanoutscuffcoversperiodicallytoavoidbuildupof
mineralizeddirtparticleswhichwillaffectperformance.
_Thesearchcoil iswaterproofandcanbesubmergedineitherfreshorsalt
water.
Afterthesearchcoilisusedinsaltwater,rinseitandthelowerstem
assemblywellwith freshwatertoprevent corrosionofthemetalparts.
_Thesearchcoil iswaterproofbut theelectronicsarenot, soalwaysprevent
any moistureor waterfromenteringthecontrolhousingandneverallowthe
cableconnectortobecomesubmergedinwater.
_Ifworkinginornearwater,orifthereisapossibilityofrain,usea
protectiveweatherresistant pouchorplasticbagtocoverthecontrol
housing.Makesureitcan"breathe"inordertoensure
againstcondensationbuildupinside.
_Aftereachuse,cleanthedetectorwith asoftcloth toremovedust,
moisture,orothercontaminants.
_Whentransportingthedetectorinacarduringhotweather,storeitonthe
floor ofthepassengercompartment ifpossible.Usingacarrybaggives
additionalprotection.Inanycase,neverallowthedetectortorollaround
unprotectedinthetrunk orbackofapickuptruck.
_Protectyourdetectorfromdust,moisture,andextremetemperatures
duringstorage.
_Treatyourdetectoras youwouldany sensitiveelectronicinstrument.
Thoughruggedlyconstructedanddesignedtowithstandthedemandsof
normaltreasurehunting,propercareisessential.