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

3. ACPowerAdaptorPort

4. LCDDisplay

5. Multi‐colorLEDIndicator
Note:Batterycompartment,tiltstand,
andwallmountlocatedonrearof
meter.
1
2
3
4
5
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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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6FM100‐en‐GB_v1.76/16
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

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