Extech Instruments EA20 User manual

Brand: Extech Instruments

Model: EA20

Category: Measuring, testing & control

Type: User manual

User's Guide

EasyView™ Digital Hygro-Thermometer

and

Datalogger

Model EA20

EA20-EN V1.8 3/14

Introduction

CongratulationsonyourpurchaseoftheExtechEasyView™EA20DigitalHygro‐Thermometer.Thisdevice

measuresHumidity,Temperature,DewPointtemperatureandWetBulbtemperature.Advancedfeatures

include Manual Datalogging of up to 99 sets, MAX/MIN recording, Relative measurement mode, and

elapsedtimer.Carefuluseofthismeterwillprovideyearsof

reliableservice.



MeterDescription

1. Humidity/TemperatureProbe

2. MultifunctionLCDwithbargraph

andstatusindicators

3. PowerON/OFFbutton

4. MX/MNbutton

5. DATAHOLDbutton

6. Humidity/Temperatureselect

button

7. TIMEbutton(forMX/MNelapsed

timer)

8. Temperatureunits(C/F)select

button

9. DEWPOINTtemperatureselect

button

10. RELATIVEmodebutton



11. WETBULBtemperatureselect

button

12. MEMkeymanualdatalogging

controlkey

13. READkeymanualmemorydatareading

controlkey

14.

keystoselectmemory

location

Note:Thebatterycompartmentislocated

ontherearoftheinstrument

EA20-EN V1.8 3/14

Operation

NOTE:Donotimmersetheprobeinliquid;itisintendedforuseinaironly.

TurnPowerONorOFF

Pressthebuttontoturnpoweronoroff.Themeterwillperformashortself‐testwhenturnedon.

Takingmeasurements

1. Holdtheprobeintheareatobetested.

2. Allowadequatetimeforreadingstostabilize.

3. ReadthehumidityandtemperatureontheLCD.The%RH/TEMPbuttonallowstheusertochoose

whetherthetemperatureorthehumidityisdisplayedonthelargerdigits.Pressthe%RH/TEMPbutton



totogglethedisplayconfiguration.

Selectingtemperatureunitsofmeasure(C/F)

Pressthe

Fbuttonmomentarilytotogglethetemperatureunits.

Maximum(MX)andMinimum(MN)recording

NOTE:TheAutomaticPowerOFFfeaturewillbedisabledwhiletheMX/MNmodeisselected.

TheMX/MNmodeallowstheusertoviewonlythehighest(MX)orlowest (MN)readings.PresstheMX/MN

buttonmomentarilytostarttheelapsedtimerandbeginrecording.Thedisplaywillnowonlyshowthe



highestreading(theMXiconwillappear).PresstheMX/MNbuttonagaintoviewthelowestreading(MN

willdisplay).TheTIMEbuttonallowstheusertoviewtheelapsedtimeforaparticularMaxorMinreadingin

Minutes:Seconds(59mins:59secsmax)orDays:Hours(99days:24hoursmax).Tocheckthehighest

orlowest

DewPointorWetBulbtemperatures,usetheDEWandtheWETbuttons.Thefollowingdatadisplaysare

availableintheMX/MNmode:

a. MaximumandMinimumhumiditywithitsassociatedtemperaturereading

b. MaximumandMinimumtemperaturewithitsassociatedhumidityreading

c. MaximumandMinimumDewpointtemperaturewithitsassociatedstandardtemperatureor

humidity

d. MaximumandMinimumWetBulbtemperaturewithassociatedstandardtemperatureorhumidity

ToexittheMX/MNmode,pressandholdtheMX/MNbuttonuntiltheMXandMNiconsdi sappear.

DataHold

PresstheHbuttonmomentarilytofreezethedisplayedreading.The'H'iconwillappearontheupperleft‐

handsideofthedisplay.PresstheHbuttonagaintoreturntonormaloperation(the'H'holdiconwill

disappear).

DEWPOINTtemperaturedisplay

DewPointtemperatureiscalculatedbythemeterbasedonhumidity/temperaturemeasurements.Toview

theDewPointtemperature,presstheDEWbuttonmomentarily.The‘DEW’displayiconwillappearonthe

rightsideoftheLCD.TheDewPointtemperaturewilldisplayonthebottom(larger)digits.Theupper

(smaller)digits

willdisplaytheregulartemperaturein°Cor°ForthehumidityinRH%(usethe%RH/TEMP

buttontotogglebetweenthetwo).

WETBULBtemperaturedisplay

WetBulbtemperatureiscalculatedbythemeterbasedonhumidity/temperaturemeasurements.Toview

theWetBulbtemperature,presstheWETbuttonmomentarily.The‘WET’displayiconwillappearonthe

rightsideoftheLCD.TheWetBulbtemperatureisdisplayedonthebottom(larger)digits.Theupper

(smaller)digits

willdisplaytheregulartemperaturein

Cor

ForthehumidityinRH%(usethe%RH/TEMP

buttontotogglebetweenthetwo).

EA20-EN V1.8 3/14

ManualDatalogging

ClearingTheMemory

1.Pressthebuttontopoweroffthemeter.

2.PressandholddowntheMEMkey,thenpressthekeytopoweronthemeter.Thedisplaywillshow

“CLr”indicatingthatthememoryhasbeenerased.



EnteringAReading

1. PresstheMEMkeytoenterareading.Thedisplaywillmomentarilyshowan“M”andthememorylocation

numberfrom1to99.

2. Whenthememoryisfull,thedisplaywillshow“FULL”.



DataRecall

1. Pressthe“READ”keytoentertheREADmode.TheLCDwillshowan“R”andthememoryaddressnumber.

2. Pressthe“

”keystoscrollthroughthememorylocations.

3. Press“DEW”or“WET”toviewthestoredDewPointorWetBulbtemperature.

4. Pressthe“READ”keytoexitthismode.



Relativemode

Measurementscanbedisplayedasadifferencebetweenactualhumidity/temperatureandstoredreference

values.Tostoreahumidity/temperaturereadinggroupasareference,presstheRELbuttonwhenthe

desiredreferencereadingsareontheLCD(thetriangleiconwillappearsteadyintheupperleft‐handcorner

oftheLCD).

Allsubsequentdisplayedreadingswillbe“relative”tothestoredreferencevalue.Forexample,

ifthereferencevaluesare50.0%&100°Fandtheactualreadingsare53.0%&105°F,themeterwilldisplay

3.0%&5°F.ToexittheRelativemode,pressandholdtheRELbuttonuntilthe

triangleicondisappears.



AutomaticPowerOFF

Themeterautomaticallyshutsoffafteraprogrammedperiodoftime.Toprogramthetimeperiodpressand

holdtheTIMEbuttonwhileturningthemeteron.ReleasetheTIMEbuttonafterthemeterfinishesitsself‐

test.PresstheTIMEbuttontoscrollthroughtheeighttimeselections(shownon

thesmallerdigitsatthe

centeroftheLCD).Selectfromthefollowinglist:0(disabled),1,3,5,10,15,30,or59minutes.PresstheH

buttontostorethedesiredtime.

EA20-EN V1.8 3/14

Specifications

Function RangeandResolution Accuracy

Humidity 10.0to95.0%RH ±3%RH(at25

C,30to95%RH)

±5%RH(at25

C,10to30%RH)

Temperature‐4to140

F(‐20to60

C) ±1.8

F(±1

DewPoint ‐4to140

F(‐20to60

C) calculated

WetBulb ‐4to140

F(‐20to60

C) calculated

Display MultifunctionLCDwithbargraphandstatusindicators

SensorType Humidity:Precisioncapacitancesensor

Temperature:Thermistor

ResponseTime Humidity:45%to95%<1min;95%to45%<3min.

Temperature:Approx.2secondsfora10

Cchange

SamplingRate 2timespersecond

DataloggingMemory 99sets

OperatingConditions 32to140

F(0to60

C);<95%RHnon‐condensing

StorageConditions 14to140

F(‐10to60

C);<70%RHnon‐condensing

PowerSupply 6x1.5V‘AAA’batterieswithprogrammableautopoweroff(1minuteto59

minutesin7selectabletimes)

BatteryLife Approx.200hours

Dimensions/Weight 5.9x2.8x1.4”(150x72x35mm);8.3oz.(235g)



Maintenance

Cleaningandstorage

1. Themetershouldbecleanedwithadampclothandmilddetergentwhennecessary.Donot usesolvents

orabrasives.

2. Storethemeterinanareawithmoderatetemperatureandhumidity(refertotheoperatingandstorage

rangeinthespecificationschartearlierinthismanual).

BatteryReplacement

Whenthebatterypowerfallslow,the‘BT’symbolwillappearontheLCD.Repl acethesix(6)1.5‘AAA’

batteriesbyremovingtherear(center)batterycompartmentscrewandaccessingthebatterycompartment.

Observepolaritywhenplacingthebatteriesinthecompartment.Ensurethatthecompartmentcoveris

securelyfastened

whenfinished.

Warranty does not apply to defects resulting from action of the user such as misuse, improper wiring,

operation outside of specification, improper maintenance or repair, or unauthorized  modification. Extech

specificallydisclaimsanyimpliedwarrantiesormerchantabilityorfitnessforaspecificpurposeandwillnot

be liable for

any direct, indirect, incidental  or consequential damages. Extech's total liability is limited to

repair or replacement of the product. The warranty set forth above is inclusive and no other warranty,

whetherwrittenororal,isexpressedorimplied.



Reservadostodoslosderechos,incluyendoelderechodereproduccióntotaloparcialencualquiermedio

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Extech Instruments EA20 User manual

Brand: Extech Instruments

Model: EA20

Category: Measuring, testing & control

Type: User manual

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Extech Instruments EA20 User manual

Extech Instruments EA20 User manual

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