Extech Instruments HT200 User manual

USERMANUAL
HeatStressWBGTMeter
ModelHT200
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2HT200‐en‐GB_V1.411/16
Introduction
ThankyouforselectingtheExtechInstrumentsModelHT200HeatStressWBGTMeter.The
HT200accuratelydeterminestheHeatStressbyfactoringacombinationofparameters:
Humidity,Temperature,andDirectSolarRadiation.Thesefactorsaffecthowhighbody
temperaturesrise,aswellastheabilitytocooldown.Thisdeviceisshippedfullytestedand
calibratedand,withproperuse,willprovideyearsofreliableservice.Pleasevisitourwebsite
(www.extech.com)tocheckforthelatestversionofthisUserGuide,ProductUpdates,Product
Registration,andCustomerSupport.
Features
Fastrespondingcapacitancesensor
Accuratemeasurementsfor:Wetbulbglobetemperature(WBGT),Blackglobetemperature
(TG),Humidity(%RH),Airtemperature(TA),Wetbulb(WET),andDewpoint(DEW)
Maximum,minimum,anddataholdRecording
Lowbatteryindication
LCDdisplaywithLEDbacklighting
Manualdatarecording(upto50readingsets)
Viewdatarecords
SelectabletemperatureunitsCorF
Brassblackball50mm(2”)diameter
WBGThighandlowaudibleandvisualalarmfunctions
AutoPowerOFFwithdisablefunction
Safety

WARNING:Avoidelectromagneticinterference(EMI)toavoiderraticmeterreadings.


WARNING:Themeasurementswillbeinaccurateiftheblackballistouchedduringatest.

WARNING:Iftheblackballisdamageordeformedinshape,inaccuratemeasurement
valueswillresult.

CAUTION:Pleaseplacethemeterinawarmtemperatureandlowhumidityenvironment
for24hoursafterthemeterhasbeenusedinanoverlyhumidenvironment.

CAUTION:Pleasehavethemetercalibratedyearlyforthebestresults.

WARNING:Donotstorethisdeviceindirectsunlightorinoverlyhotand/ordampareas.
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3HT200‐en‐GB_V1.411/16
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MeterDescription
1. UpArrow/MAX‐MINbutton
2. MODE/SETbutton
3. PowerON‐OFFbutton
4. UNIT/DATAHOLDbutton
5. LCDDisplay
6. Temperature&Humiditysensor
7. BlackGlobesensor
8. Backlight/MEMbutton
9. SEL/Alarmbutton
10. Downarrow/RECbutton
11. ACAdaptorpowerjack
Note:Batterycompartmentonback
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4HT200‐en‐GB_V1.411/16
LCDDisplayDescription


1. Alarmsymbol
2. DATAHOLDsymbol
3. WBGTMode
4. Maxreadingsymbol
5. Airtemperaturemode
6. Blackglobetemperaturemode
7. MIN(minimum)readingsymbol
8. Wetbulbtemperaturemode
9. USBsymbol(unusedinHT200)
10. Dewpointtemperaturemode
11. Primarydisplayarea
12. Temperatureunits
13. Relativehumiditymode
14. Secondarydisplayarea
15. Storedreading‘R’alert&MemoryRecall‘M’icon
16. Timesymbol(unusedinHT200)
17. Datesymbol(unusedinHT200)
18. DataRecordmodesymbol
19. SetModesymbol
20. Indoorsymbol(WBGT)
21. Outdoorsymbol(WBGT)
22. Lowbatterysymbol
23. Autopoweroffsymbol
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5HT200‐en‐GB_V1.411/16
Operation
Poweringthemeter
PressthePower buttontopowerthemeterONorOFF.Toshowallofthedisplaysymbols
atonce:withthemeterOFF,pressandholdthePower button.Thefirmwareversionwill
displayforonesecond(afterthebuttonisreleased).
AutoPowerOff
TheHT200automaticallypowersoffafterapproximately15minutesofinactivity.
Enable‐DisableAutoPowerOff
WithpowerON,pressandholdthePower buttonforatleast2secondstodisableor
enableautopower‐off.Theclock symbolappearsontheLCDscreenwhentheAutoPower
OFFfeatureisenabled.ThesymboldisappearswhentheAutoPowerOFFfeatureisdisabled.
Note:Theautopower‐offwillbedisablediftheSETfunctionorthealarmisenabled.
AlarmON‐OFF
PressandholdtheSEL/Alarm buttonforatleast2secondstoturnthealarmfunctionON
(armed)orOFF(disarmed).WhenarmedtheALARMdisplayiconwillappear.Whendisarmed,
theALARMdisplayicondisappears.
Note:ThealarmfunctionisdisabledwhentheHOLD,SET,orVIEWDATARECORDSDfunctionis
enabled.
DisplayBacklight
PresstheBacklight/Mem buttontoturnontheLCDbacklight.TheLCDbacklightwill
automaticallyturnoffafter15seconds.
SelectingTemperatureC/Funitsofmeasure
PresstheUnit/DH buttontoselectthedesiredtemperatureunitofmeasure.
ModeSelection
PresstheMode/Set buttontochangethemode.TheavailablemodesareWBGT,TA,%RH,
TG,WET,DEW,andbacktoWBGT(seedefinitionsbelow):
oWetbulbglobetemperature(WBGT)
oAirtemperature(TA)
oHumidity(%RH)
oBlackglobetemperature(TG):monitorstheeffectsofdirectsolarradiation
oWetbulbtemperature(WET)
oDewpointtemperature(DEW)
IntheWBGTmode,presstheSel/AlarmbuttontotoggleIN(indoor:withoutdirectsun
exposure)andOUT(outdoor:withdirectsunexposure)modes.
Note:ThemodefunctionisunavailableintheHOLDfunctionandSETfunctionmodes.
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6HT200‐en‐GB_V1.411/16
DataHold
PressandholdtheUnit/DHbuttonfor2secondstoenabletheDataHoldfunction.The
HOLDdisplayiconwillappearthedisplayedreadingwillbefrozenuntilthebuttonispressedand
heldagain.
Note:TheHOLDfunctionisunavailablewhentheSETfunctionisenabled.
ManualDataRecording
PresstheREC buttontomanuallyrecord(store)thecurrentreading.TheRECandRsymbol
willbrieflyappearontheLCDwhilethereadingisstored.
Note:TheRecordReadingfunctionisunavailableintheHOLD,SET,andVIEWDATARECORDS
modes.
ViewDataRecords
PressandholdtheBacklight/Membuttontoturnaccess(orexit)theViewDataRecords
mode.WhentheViewDataRecordsmodeisaccessed,therecordnumberisshownonthe
bottomofthedisplay,theassociatedreadingisshownatthecenterortheLCD,andthe‘M’
memoryand‘REC’iconswillbevisible.
Usethearrowbuttonstoscrollthroughthestoredreadings.
PresstheMode/Setbuttontochangethemeasurementtype(i.e.WBGT,TA,%RH)forthe
currentlyselectedrecord.
PresstheUnit/DH buttontoswitchthetemperatureunit.
PressandholdtheBacklight/Membuttontoexittheviewingdatarecordsmode.

Note:TheViewDataRecordsmodeisunavailablewhentheHOLDorSETfunctionisenabled.
Maximum‐Minimum(MAX‐MIN)ReadingRecording
PressandholdtheMax/Min buttontoentertheMAX‐MINrecordingmode.TheLCDwill
showtheMAXiconalongwiththemaximumtemperaturemeasurement.
UsetheMax/MinbuttontotogglebetweenMaximum(MAX)andMinimum(MIN)
readings.PressandholdtheMax/Minbuttonformorethan2secondstoexitthe
maximum/minimummode.
Note:TheMAX‐MINmodeisunavailablewhentheHOLD,SET,orVIEWDATARECORDSfunction
isenabled.
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7HT200‐en‐GB_V1.411/16
SettingMode
Pressandholdthe buttontoaccesstheSettingmodewhereaseriesofparameterscanbe
customized.Theavailableparametersareexplainedindividuallybelow.Toscrollthroughthe
parametersusethebutton.Pressthe buttontostarteditingaparticularparameteras
explainedbelow.
WBGTHIGHALARMTHRESHOLD(HI)

1. SteptotheWBGTHighAlarmThresholdscreenusingthebutton.
2. AttheHighAlarmThresholdscreen,pressthebuttontobeginediting;thedisplay
willbeginflashing.
3. Pressthe buttontoselectthedesiredtemperatureunits.
4. UsetheupanddownarrowbuttonstosettheWBGTHighAlarmThresholdvalue.
5. Usethebuttontoselectthedigittoedit.
6. Pressthebuttonagaintosavethesetting.
7. ThemeterwillnowaurallyandvisuallyalarmwhentheHighAlarmThresholdhasbeen
exceeded.Toarm/disarmthealarmfunction,refertothe‘ALARMON‐OFF’section.
WBGTLOWALARMTHRESHOLD(LO)

1. SteptotheWBGTLowAlarmThresholdscreenusingthebutton.
2. AttheLowAlarmThresholdscreen,pressthebuttontobeginediting;thedisplay
willbeginflashing.
3. Pressthe buttontoselectthedesiredtemperatureunits.
4. UsetheupanddownarrowbuttonstosettheWBGTLowAlarmThresholdvalue.
5. Usethebuttontoselectthedigittoedit.
6. Pressthebuttonagaintosavethesetting.
ThemeterwillnowaurallyandvisuallyalarmwhentheLowAlarmThresholdisreached.To
arm/disarmthealarmfunction,refertothe‘ALARMON‐OFF’section.
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8HT200‐en‐GB_V1.411/16
CLEARSTOREDREADINGS

1. Steptothe‘ClearStoredReading’screen(exampleshownabove)usingthe button.
Thenumberatthebottomofthedisplayindicatesthenumberofreadingsstored(50
maximum).
2. Pressthe buttonandthedisplaywillbeginflashing.
3. UsetheupordownarrowbuttontoselectYESorNO.SelectYEStoeraseallstored
readings.PressNOtoretainthereadingsinmemory.
4. Pressthebuttontoperformtheselectedaction(YESorNO).

AIRTEMPERATUREOFFSET

1. SteptotheAirTemperatureOffsetscreenusingthebutton(examplescreenshown
above).
2. Pressthebuttontobeginediting;thedisplaywillbeginflashing.
3. Usetheupanddownarrowbuttonstosettheoffsetvalue(from‐9.9to+9.9)
4. Pressthe buttontoselectthedesiredtemperatureunits.
5. Pressthe buttonagaintosavethesetting.

RELATIVEHUMIDITY%OFFSET

1. SteptotheRH%Offsetscreenusingthebutton(examplescreenshownabove).
2. Pressthebuttontobeginediting;thedisplaywillbeginflashing.
3. Usetheupanddownarrowbuttonstosettheoffsetvalue(from‐9.9to+9.9).
4. Pressthebuttonagaintosavethesetting.

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EXTECHINSTRUMENTS
9HT200‐en‐GB_V1.411/16
BLACKGLOBETEMPERATUREOFFSET

1. SteptotheBlackGlobeTemperatureOffsetscreenusingthe  button(example
screenshownabove).
2. Pressthe buttontobeginediting;thedisplaywillbeginflashing.
3. Usetheupanddownarrowbuttonstosettheoffsetvalue(from‐9.9to+9.9).
4. Pressthe buttontoselectthedesiredtemperatureunits.
5. Pressthebuttonagaintosavethesetting.
BatteryReplacement

Whenthebatteryicon() appearsontheLCD,the9Vbatterymustbereplaced.Turnoffthe
powerandunplugallcables.Removethebatteryfromtherearbatterycompartmentand
replaceitwithanew9Vbattery.Pleaseobservecorrectbatterypolarityanddonotswitchthe
unitONuntilthebatterydoorisclosedandsecured.
Whenthemeterisnotinuse,pleaseremovethebattery.
Neverdisposeofusedbatteriesorrechargeablebatteriesinhouseholdwaste.
Asconsumers,usersarelegallyrequiredtotakeusedbatteriestoappropriate
collectionsites,theretailstorewherethebatterieswerepurchased,orwherever
batteriesaresold.
Disposal:Donotdisposeofthisinstrumentinhouseholdwaste.Theuserisobligatedtotake
end‐of‐lifedevicestoadesignatedcollectionpointforthedisposalofelectricalandelectronic
equipment.
ACAdaptorPower
TheACpoweradaptorjackislocatedonthebottomofthemeter.Seespecificationsbelow:

ExternalACtoDCadapter:Voltage9VDC(8~14VDCMax)/500mW.
Socket:Pinpositive,Groundcasingnegative.
Externaldiameter5.5mminternaldiameter2.1mm



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EXTECHINSTRUMENTS
10HT200‐en‐GB_V1.411/16
Specifications
Wetbulbglobetemperature(WBGT)
UnitRangeResolutionAccuracy(calculated)
@15~40oC
Indoor
&
OutdoorWithout
sunlight
°C0~59.00.1WBGT=
(0.7×WET)+(0.3×TG)
°F32.0~138.00.1WBGT=
(0.7×WET)+(0.3×TG)
Outdoor
Withsunlight
°C0~56.00.1WBGT=(0.7×WET)+
(0.2×TG)+(0.1×TA)
°F32.0~132.00.1WBGT=(0.7×WET)+
(0.2×TG)+(0.1×TA)
AirTemperature(TA)
UnitRangeResolutionAccuracy@15~40oC
°C0~50.00.1±0.8
°F32.0~122.00.1±1.5

Blackglobetemperature(TG)
UnitRangeResolutionAccuracy@15~40oC
°C0~80.00.1±0.6
°F32.0~176.00.1±1.1
RelativeHumidity(%RH)
MeasurementRange1%~99%
Accuracy±3.0%RH(20~80%)
±5.0%RH(<20%or>80%)
Resolution0.1%
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EXTECHINSTRUMENTS
11HT200‐en‐GB_V1.411/16
Dewpointtemperature(DEW)
UnitRangeResolution
°C‐35.3~48.90.1
°F‐31.5~120.10.1
ThevalueiscalculatedfromtheRHandAirtemperature
Wetbulbtemperature(WET)
UnitRangeResolution
°C‐21.6~50.00.1
°F‐6.9~122.00.1
ThevalueiscalculatedfromtheRHandairtemperature
MeterDimensions300x70x50mm(11.81x2.76x1.97in.)[LxWxH]
LCD 52mm(W)x36mm(L)[2.05in(W)x1.42in(L)]
BallDimensions 50mmdiameter,19mmheight(2”diameterand0.75”height)
Weight  220g(7.76oz.)withoutbatteries
OperatingAltitude2000m(6562ft)max.
SamplingRate Onepersecond(1Hz)
OperatingTemperature&Humidity0°Cto+50°C(32°Fto122°F),<95%RH.(Non‐condensing)
StorageTemperature&Humidity‐10°Cto+50°C(14°Fto122°F),<70%RH.(Non‐condensing)
Powersupply9VbatteryorACAdaptor100~240VDC9V/0.5A(9mm)
Batterylife200hours
Accessories 9Vbattery,CarryingCase,andAC100~240VtoDC9V/0.5A(9mm)Adaptor
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EXTECHINSTRUMENTS
12 HT200‐en‐GB_V1.411/16
ThermalHazardPreventionStandards
Screening Criteria for Heat Stress Exposure (WGBT values in °C); for reference purposes only.
ExampleofActivitieswithinMetabolicRateCategories*
Categories  Examples/Activities
RestingSittingquietly
Sittingwithmoderatearmmovements
Light
Sittingwithmoderatearmandlegmovements
Standingwithlightworkatmachineorbenchwhileusingmostlyarms
Usingatablesaw
Standingwithlightormoderateworkatamachineorbenchandsome
walkingabout
Moderate
Scrubbinginastandingposition
Walkingaboutwithmoderateliftingorpushing
Walkinglevelat3.7mph(6Km/hr)whilecarrying6.6lbs.(3Kg)weight
Heavy
Carpentersawingbyhand
Shovelingdrysand
Heavyassemblyworkonanon‐continuousbasis
Intermittentheavyliftingwithpushing/pulling(pick‐and‐shovelwork)
VeryheavyShovelingwetsand
*AccordingtotheAmericanConferenceofGovernmentalIndustrialHygienists[ACGIH](2005)
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