Dostmann Electronic GD 383 User manual

CONTENT Page
1. GENERALINFORMATION------------------2
2. FEATURES ---------------------------------------- 2
3. SPECIFICATION ---------------------------------3
4. OPERATIONGUIDE --------------------------- 4
5. PART &CONTROL------------------------------5
6. GETTING STARTED----------------------------7
6-1InstallingBatteries----------------------------7
6-2 Automatic Circuit/Reset Feature---------8
6-3 Feature SensitivityAdjustment---------- 9
7. OPERATINGPROCEDURE----------------- 9
8. REPLACING NEWSENSOR--------------11
9. CLEANING --------------------------------------- 12

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1. GENERALINFORMATION
Thankyou forpurchasing Combustible Leak Detector.
Read thoughtheinstruction manual before operation
forcorrect andsafeusage.Pleasestoreandretain
this instruction manual for futurereference.
2. FEATURES
Combustible LeakageDetector is extremelyuseful as
a general purposetool in anyenvironmentwhere
gasoline, propane, natural gas or fuel oil is used. This
unitusesa newlydevelopedsemi-conductor sensor
which is extremely sensitivetovariety ofgeneral
used combustible.
§Microprocessor Control withadvanced digital
signal processing.
§Multicolor visualdisplay.
§High-Low leaksensitivityselector.
§Lowbatteryindication.
§Semiconductorgassensor.
§Detection of combustible gas.
§Carrying case included.
§15.5” (40 CM) flexible stainless probe.
§ReferenceLeaksource included.
§Ambientconcentration reset.
Application:
§Detect leaksinautomobileexhaustand fuel
system.
§Detect leaksin liquidor gasfired heating systems.
§Safetychecks at propane filling stations.

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§Search forarsonresidue(detects accelerants).
§Detect fuelin marine bilges.
§Check manholes/sewersfor safety.
§Check for crackedheat exchangers.
§Detect solventresidue.
3. SPECIFICATION
Detectable Gases:
Gasoline, propane, naturalgasor fuel oil.
AlarmMethod:
Buzzer,Tricolor LED barIndicator.
Sensitivity: Variable, aslow as5ppm(gasoline)
Power Usage:
4AAsize(6V DC) Alkaline Batteries
Snake Tube length: 40cm(15.5”)
Dimension/ Weight:
173x66x56 mm(approximately400g)
Accessories:
Alkaline batteries(AA) X4pcs
Usermanual, leakcheckbottle, carrycase.
BatteryLife:
Approximately40 hours normal use.
Auto powerOFF: 10minutes
Warm-Up Time: Approximately90 seconds
OperatingTemperature & Humidity:
0 ~40 °C,< 80% RH

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Storage Temperature &Humidity:
-10 ~60 °C, < 70% RH
Altitude: <2000M(6500’)
4.OPERATIONGUIDE
(1) The combustible leak detectorunit isnotequipped
with anti-explosivedesignsand measures. Donotuse
thisunit in theenvironment with theburnablegases.
(2) Therearesome environmental conditions that
might causeerror reading:
§Pollutant places.
§Largetemperaturevariation.
§Places with highwind velocity.
§Organicsolvent,adhesive vapor,fuelgas and
vesicant will causeabnormal responsefromthe
sensor.Trytoavoidthe environment involved with
thissubstance.
§Placesfillwith too muchto combustible Gas.
Note: Althoughtheunitwillrespondtohighlevelsof
carbon monoxide, itshouldnot beused asadetector
forthisgasinnormal roomorworking atmospheres.
Itisused topinpointaleakasdescribed inthe
operatinginstruction.

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5. PARTS &CONTROL
5-1 PanelDescription
,9
COMBUSTIBLE
GAS DETECTOR

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,1Sensor ,2Sensor Protector
,3LED Leak Indicators ,4Sensitivity Lo Button
,5Sensitivity Hi Button ,6LowBatteryIndicator
,7Power On/Off & Reset Button
,8BatteryCover ,9BatteryCover Screw
5-2 LEDLeak IndicatorDefinition:

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6. GETTING STARTED
6-1Installing Batteries
§Loosethescrewand removethebattery
compartment doorlocatedonthebottomofthe
instrument asshown below(Fig.1).
§Install 4 “AA” sizealkalinebatteries.
§Reinstall thebatterycoverbyaligning it with the
handle.
Whenthebattery powerisrunning low, theRedLED
LowBatteryindicatorilluminates.Thebatteriesshould
bereplaced asquicklyas possible.
4 “AA”size
alkalinebatteries
Fig.1

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6-2 Automatic Ambient Reset Feature
This combustible leakdetectorfeatures anAutomatic
Ambient Resetfunctionthatsetsthe unit toignore
ambient concentrationsofcombustible.
§Automatic Ambient Setup - Upon initial poweron,
theunit automaticallysetsitself to ignorethelevel
of combustible present atthetip. Onlyalevel, or
concentration, greater than thiswill causeanalarm.
CAUTION!
Beawarethatthisfeaturewill causetheunit to
ignoreany combustible present atturn on. Inother
words,with theunit off ifyouplacethetip up toa
knownleakand switchtheunit on, noleakwill be
indicated!
§Ambient Reset Feature - Resetting theunit during
operationperformsasimilarfunction; it programs
thecircuittoignorethelevel of combustible
present atthetip. This allowstheuserto'home-in'
onthesourceoftheleak(higherconcentration).
Similarly,theunit canbemovedtofreshair and
resetformaximumsensitivity. Resetting theunit
with no combustible present (freshair) causesany
levelabovezerotobedetected.

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6-3 Feature SensitivityAdjustment
The Instrument providestwolevelsofsensitivity.
When theunit isswitchedon, it issettothehigh
sensitivity level bydefault.
§Tochangethesensitivity,press the key.
Whenthekeyispressed,thevisual displaywill
momentarilyshow the two leftLED's (green)
indicatingLowSensitivitylevelisselected.
§Toswitch backtoHigh Sensitivity, press the
key.The two right LED's (red) will lightmomentarily
indicatinghigh Sensitivitylevel isselected.
7. OPERATING PROCEDURE
WARNING!
1. Donotuse the instrumentinan areaof
extremely high level of combustible gas.
2. The gas/vaporoforganic solventmight
interfere with the function ofthe unit. During
detection, please eliminate the influence ofthe
organic solvent.
3. In order to ensure correct operation and
indication, theunit should be switched on and
warm-up innon-contaminatedatmosphere.

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lHow to FindLeaks?
NOTE: Asuddenwhipping oftheleak detectorprobe
or"blowing" intothesensortip will affecttheair flow
over thesensor andcausetheinstrument toalarm.
(1) Power-Up & Reset function key:
The keyturnsthe combustible leakdetector
instrument ON or OFF and reset function.
Press it oncetoturn on the combustible leakdetector,
thedisplaywill illuminatewith flash,for 1.5 minutes to
heat up thesensor.
Press it again toreset theambient baseconcentration.
Press and hold thisbuttonfor 5 second toturn OFF the
power.
(2) Verify the condition of the unitand sensor:
§Set thesensitivitylevel to“Hi”.
§Opentheleakcheckbottlecoverandslowlymove
it closer tosnaketube nozzle.
§If theindicationmoves up tohighfromlowthen we
should movethecheckbottleawayandtheLED
should gooffagain.Thisshowsthattheunit is
underworking condition.
§If theunit does notperformas weexpect, bring the
unit for maintenanceatyour local salesoffice.
(3) Enter the Measuring Mode
§Placethetip oftheleak-detectorprobeasclose as
possibleto thesiteofthesuspectedleak.Tryto
position theprobewithin 1/4 inch(6 mm)ofthe

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possibleleaksource.
§Slowlymovetheprobepasteachpossibleleakage
point.
§Whentheinstrument detectsaleaksource, the
audibletone will alarm. Additionally,thevisual
indicatorswill lightfromleftto right; GreenLED
thenOrangeLED thenRedLED (highest
concentration) asincreasing of levelindicatethat
the location isclosetothe source.
§Whenthe Instrument signalsa leakage,pull the
probeawayfromthe leakforamoment, and then
bring it backtopinpoint thelocation. If the
combustible leakislarge,setting thesensitivity
switchtoLOW will makeit easiertofind theexact
siteoftheleak.
§Return thesensitivityswitchtoHIGH before
searching for additional leaks.
§Whenyou'vefinishedleak-testing, turn OFFthe
instrument and storeit in acleanplace,protectthe
leakdetector frompossibledamage.
8. REPLACING NEW SENSOR
Thesensorhas alimitedoperativeperiod. Under
normaloperation, thesensorshould workmorethan
oneyear.Exposethesensorunderhigh densityof
coolant (>30000ppm) will shorten itslifecyclerapidly.It
isimportant toensurethatsensorsurfaceisfreefrom

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Sensor
Sensor protector
waterdroplets,vapor,oil, grease,dustand anyor all
otherformsofcontaminant. Furthermore,toensure
goodworking conditionoftheunit, sensorsmustbe
replacement periodicallywhen itsoperativelifeisover.
WARNING! When replacing new sensor,
the worn-out sensor maybe HOT!!
(1) Removeconecap cover fromthetip ofsnaketube.
(2) Pullout old sensor and insert thenewsensorinto
theplug (seebelowfig.2).
(3) Seal thecap coverover theplug.
Fig.2

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9. CLEANING:
The Instrument plastichousing canbecleanedwith
standard householddetergent orisopropylalcohol.
Careshould betakento prevent thecleanerfrom
entering theinstrument. Gasolineand othersolvents
maydamagetheplastic and should beavoided.
WARNING!
The detergent or isopropyl alcohol might
damage thesensor, pleasekeep then from the
sensorthroughthe process.