Extech Instruments FM100 User manual



USERGUIDE



DigitalFormaldehydeMeter



ModelFM100

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2FM100‐en‐GB_v1.76/16

Introduction



ThankyouforselectingtheExtechInstrumentsModelFM100.TheFM100measures

FormaldehydeCH2O(HCHO)concentration,AirTemperature,andRelativeHumidity.Thealarm

featurealertstheuserwhentheFormaldehyde0.08ppmlimitisexceeded.

TheFM100canbewallmountedorusedasatabletopdevice.

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)forthelatestversionofthisUser

Guide,ProductUpdates,andCustomerCare.



Features

AlternatelydisplaysFormaldehydeconcentration,AirTemperature,andRelative

Humidityat6‐secondintervals

BrightmulticolorLEDdisplaysgreenforsafeHCHOlevels,yellowforcaution,andredfor

danger

AlarmdisplayiconandaudiblebeeperalertsuserwhenFormaldehydeconcentration

limitof0.08ppmisexceeded

SelectableFormaldehydeunitofmeasureppmormg/m3

ZEROcalibrationfunction

ManualtemperatureandRelativeHumiditycompensation

DesignedwithelectrochemicalCH2O(HCHO)sensor

Lowbatteryindicator



MeterDescription

1. Offsetadjustmentpotentiometer



2. ControlButton

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3. ACPowerAdaptorPort

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4. LCDDisplay



5. Multi‐colorLEDIndicator

Note:Batterycompartment,tiltstand,

andwallmountlocatedonrearof

meter.

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3FM100‐en‐GB_v1.76/16

Operation

Poweringthemeter

Ifthemeterissuppliedwithoutbatteriesinstalled,installthesuppliedbatteriesintherear

batterycompartmenttopowerthemeter.Pleaseobserveproperpolarity.

Ifthemeterissuppliedwiththebatteriesinstalled,andaprotectivebatterystripisinstalledin

thebatterycompartment,removetheprotectivestriptopowerthemeter.

Alternatively,pluganACadaptorintothejackonthesideofthemeterandthenintoanAC

powersourcetopowerthemeter.

NormalOperatingMode

WhenswitchedON,theLCDdisplays‘0000’foraperiodoftime,dependingonthetimethatthe

meterhasbeeninactive.Themeterwillthenproceedtothenormalmodeofoperationwhere

theLCDdisplaysthecurrentHCHOlevelinppm,theTemperature(°C/°F),andRH%(relative

humidity)alternatelyat6secondintervals.

Multi‐ColorStatusIndicatorLED

TheFrontpanelstatusLEDusesacolor‐codingsystemtoinformtheuserastothemeasured

HCHOconcentration.GreenforGood;YellowforHazard;RedforDanger.IftheLEDfailsto

illuminatepleasereturntheunitforservice.

Alarmindication

WhentheFormaldehydelimitof0.08ppmisexceededthemeteraudiblybeepsandflashesan

alarmiconontheLCD.RefertotheCONTROLBUTTONsectiontolearnhowtosilencethe

beeper.

ControlButton

TheControlbuttonlocatedontheleftsideofthemeterisusedtocontrolandprogramavariety

ofmeterfunctions.PressandholdtheControlbuttontoenterthefunctionmode.Repeated

pressesofthecontrolbuttoncyclethroughtheavailableparameters.Theseparameters,in

order,are:

ZEROCalibration

TemperatureUnitselection(°C/°F)

Temperaturecompensation(usedinconjunctionwithsidepotentiometeradjust)

Humiditycompensation(usedinconjunctionwithsidepotentiometeradjust)

Unitofmeasurechange(ppmormg/m3)

AlarmBeeperON/OFF

FactoryDefaultsettingreset

Escape/Return(abortoperationandreturntonormaloperation)

Note:Aremovablecoverprotectstheoffsetadjustmentandpreventsunintentional

adjustment.Removetheprotectivecovertoperformanoffsetadjustment.



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4FM100‐en‐GB_v1.76/16

ZEROCalibration

Ensurethatcalibrationisperformedinacleanairenvironment(noVOCsorHCHOgases).

Pressandholdthecontrolbuttonfor3seconds(until appearsontheLCDscreen).

Pressandholdthebuttonagaintostartcalibration.

Releasethecontrolbuttonandwait300secondsforthecalibrationtocomplete.Themeter

willdisplay‘END’for2secondswhencalibrationiscompleteandwillthenreturntothe

normalmodeofoperation.



ChangingTemperatureUnitsoC/oF

Whenisshownonthedisplay,pressandholdthecontrolbuttontodisplaythecurrent

temperatureunit.MomentarilypresstheCalibrationcontrolbuttontotoggle°Cand°F

units.Tosavesetting,pressandholdthecontrolbutton.Themeterwillreturntothe

normalmode.



TemperatureCompensationAdjustment

Whenisshownonthedisplay,pressandholdthecontrolbutton.Thefactorydefault

‘0.0’valuewillflash.Turnthecompensationpotentiometerclockwisetoincreasethe

temperatureoffsetorcounterclockwisetodecreaseoffset).Therangeis‐5.4°Fto+5.4°F(‐

3.0°Cto+3.0°C).Whendone,pressandholdthecontrolbuttontosavethesetting.The

meterwillreturntothenormalmeasurementmodeandwillreflecttheoffsetwhen

temperaturereadingsaredisplayed.



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5FM100‐en‐GB_v1.76/16

RelativeHumidityCompensationAdjustment

Whenisshownonthedisplay,pressandholdthecontrolbuttontoentertherelative

humiditycompensationadjustmentmode.Momentarilypressthecontrolbuttontomakea

stepchangeintheRH%offset;therangeis‐9to+9RH%.Whendone,pressandholdthe

controlbuttontosavethesetting.Themeterwillreturntothenormalmode.

Warning:Whileperformingthecompensationadjustments,donottouchthesensor,as

accuracymaybelostwhenadjustingthetemperaturevalues.



Warning:WhileperformingtemperatureorRH%compensationadjustmentsdonottouch

theslottedopeningsonthemeterhousing,thesearewherethesensorsarelocated.

Otherwise,accuracymaybecompromised.



ChangeFormaldehydeUnit(ppmormg/m3)

When isshownonthedisplay,pressandholdthecontrolbuttontoentertheunit

selectionmode.Choosetheunits(ppmormg/m3)bymomentarilypressingthecontrol

button.Oncethedesiredunitsarechosen,pressandholdthecontrolbuttontosavethe

setting.TheLCDdisplaywillreturntothenormalmeasurementmode.



BeeperActivateorInactivateSelection

When isshownonthedisplay,pressandholdthecontrolbuttontoenterthealarm

(beeper)settingmode.Momentarilypressthecontrolbuttontotogglethebeeper

conditionONorOFF.Onceselected,pressandholdthecontrolbuttontosaveandreturn

tothenormalmodeofoperation.



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ReverttoFactoryDefaultSettings

When isshownontheLCDdisplay,pressandholdthecontrolbuttontoresetthe

metertoitsdefault(factory)settings.



Escape/ReturnFunction

When isshownontheLCDdisplay,pressandholdthecontrolbuttonfor3secondsto

abortthecurrentprogrammingstepandreturntothenormalmeasurementmode.



Maintenance

LowBatteryConditionandBatteryReplacement

Whenthebatteryicon()appearsontheLCD,thebatteriesmustbereplaced.Ifthemeteris

lowonbatteryvoltage,erraticorinaccuratereadingsmayresult.Neverusethemeterwiththe

lowbatteryicondisplayed.

Thebatterycompartmentisonthebackoftheinstrument.Slidethebatterycompartmentcover

offofthemetertoaccessthebatteries.Replacethe4AAAbatteriesobservingproperpolarity

andreplacethecompartmentcoverbeforeswitchingthemeterON.

BatterySafetyReminders

oPleasedisposeofbatteriesresponsibly;observelocal,state,andnationalregulations.

oNeverdisposeofbatteriesinafire;batteriesmayexplodeorleak.

oNevermixbatterytypes;installnewbatteriesofthesametype.

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.

DisplayErrorCodes

Thefollowingerrorsmayappearonthedisplay:

E‐1:HCHOreadingsareoutsideofthespecifiedmeasurementrange

E‐2:Temperaturereadingsareoutsideofthespecifiedmeasurementrange

E‐3:RelativeHumidity(RH%)readingsareoutsideofthespecifiedmeasurementrange

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7FM100‐en‐GB_v1.76/16

Specifications

Display  MultifunctionLCD;Dimensions48x28mm(1.89x1.10”) 

FrontPanelLEDindicatorGreenfornormal,yellowforcaution,andredfordanger

FormaldehydeCH2O(HCHO)measurementrange 0.00to5.00ppm(mg/m3)

HCHOaccuracy ±5%ofreading+0.03ppm(baselinedrift)

AccuracyNote:AccuracymeetsNIOSHacceptancecriterionwithin

±25%ofthetruevalueat95%confidencelevel

AirTemp.Measurementrange0°Cto50°C(32°Fto122°F)

AirTemperatureResolution 0.1°C(0.1°F)

AirTemperatureAccuracy  ±1.0°C(1.8°F)

RelativeHumidityrange  20to90%RH

RHResolution  1%RH

RelativeHumidityAccuracy ±5%

PowerAAAbatteriesx4pcsoruniversalACadaptor(included)

Meterdimensions  113x108x53mm(4.4x4.3x2.1”)

Weight159g(5.6oz.)

SensorCrossSensitivitytable

SubstanceCrossSensitivity(%)

CO1

H2SNoData

H20.1

SO212

NO2NoData

NONoData

CL2‐3

C2H4NoData

NH30.0

CO20.0

Ethanol,methanol50

Phenol7

WaterVapor0.0*

*NB:Withinspecifiedrange.Stepchangesin%RHproduceshortterm

transientresponse



Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform

ISO‐9001Certified

www.extech.com



www.GlobalTestSupply.com

Find Quality Products Online at: sales@GlobalTestSupply.com

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