Extech Instruments RH30 User manual

USERGUIDE



HumidityAlert

PortableHygro‐Thermometer

withDewPoint



ModelRH30

Introduction

ThankyouforselectingtheExtechModelRH30.TheRH30monitorsrelativehumidity,air

temperature,dewpointtemperature,andMAX‐MINreadings.TheRH30alsoincludesan

audible/visualhighhumidityalarm.Thisdeviceisshippedfullytestedandcalibratedand,with

properuse,willprovideyearsofreliableservice.Pleasevisit

theExtechInstrumentswebsite

(www.extech.com)tocheckforthelatestversionofthisUserGuide.ExtechInstrumentsisanISO‐

9001certifiedcompany.

Safety

GeneralSafety

o Pleasereadallsafetyandinstructionalinformation beforeusingthisproduct.

o Thisproductisintendedforhomeuseonly.

o Unauthorizedrepairs,modifications,orotherchangestotheproductarenotsupported.

o Thisproductisnotintendedforuseinmedicalpractices.



Caution!Riskof

Injury!



o Keepthisproductanditsbatteriesoutofthereachofchildrenandpets.

o Batteries must not be placed in fire, short circuited, taken apart, or discharged. Risk of

explosion!

o Batteries can be fatal if swallowed. Contact medical emergency personnel if batteries are

swallowed.

o Batteries

contain harmful acids.Weakbatteries should bechanged as soonaspossible to

preventdamagecausedbyleakingbatteries.



ProductSafety!



o Donotplacethisproductnearextremetemperatures,vibration,orshock

o Neverholdaprobedirectlyinoroverfire

o Donotimmersethemetersin

anyliquid

2RH30‐en‐GB_v1.57/15

AL. ON

AL. OFF

65%

55%

60%

Description

MeterDescription

1. RelativeHumidityreading

2. AirTemperaturereading

3. DewPointreading(Td)

4. HumidityAlarmindicator

5. Batterycompartment

6. Resetbutton

7. MIN‐MAXbutton

8. Meterstand

9. AlarmON/OFFswitch(rear)

10. TemperatureUnitsswitch(rear)

11. RHAlarmsettingswitch(rear)

12. Wallmount

accesshole(rear)



TemperatureandHumiditychart(Forgeneralreferenceonly)



Operation

DisplayProtectiveFoil

TheLCDdisplaymayincludeaprotectivefoilcovering.Carefullyremovethisfilmbeforeuse.

Poweringthemeter

Openthebatterycompartmentbyslidingthefrontbatterycompartmentcoverdownward.Ifthe

meter is new and batteries are installed, the battery insulation strip must be removed before

use

so that thebatteries can makeproper circuit contact and power the meter. If nobatteries

areinstalled,pleaseinserttwo1.5VAAbatteriesorientedforproperpolarity.

Theinstrumentshould now bepowered up andrelative humidity, temperature, and dewpoint

temperatureshouldbedisplayedlefttorightontheLCD.



EU consumers are legally bound by the Battery Ordinance to return used batteries to

communitycollectionpointsorwhereverbatteries/accumulatorsaresold. Disposalin

householdtrashorrefuseisprohibited.

Disposal: Follow the valid legal stipulations in respect of the disposal of the device at

the

endofitslifecycle.

3RH30‐en‐GB_v1.57/15

Mounting

TheRH30 canbe wall mountedusing the rear wall mount access hole or it can be placed ona

desktoporothersurfaceusingthesuppliedstandbase.

Selecting

Funitsofmeasure

Usetherear(center)

Fswitchtoselectthedesiredtemperatureunitofmeasure.

MAX‐MINandHOLDFunction

TheRH30storesthehighest(MAX)andlowest(MIN)readingssincethemeterwaslastreset.To

viewthemaximum(MAX)reading,presstheMIN‐MAXbutton(rightside,lower).Allreadings

displayedwillnowrepresent

thehighestreadingsencounteredsincelastreset.TheMAX

indicatorwillalsoappearontheleftandmiddledisplaysforconfirmation.PresstheMIN‐MAX

buttonagaintoviewthelowestreadings(MIN)sincethelastreset.Allreadingsdisplayedwill

nowrepresentthelowestreadingsencounteredalongwiththeMINindicators.Toreset(clear)

theMAX‐MINmemories,pressRESET(rightside,upperbutton)whileMAXorMINisdisplayed.

RelativeHumidity(RH)Alert

The RH Alarm triggers an audible tone and two visual alerts (frowning face symbol illuminates

anduparrowappearsnexttothehumidityreadout) whenthe

RH exceedsthevaluesetbythe

user.Thelimitswitchontherear(right)ofthemetercanbesetto55%,60%,or65%RH.

WhentheRHreturnstothedesiredrange theaudiblealarmwillstopsoundingand thefrowning

facesymbollightwillswitchoff.

Thearrowwillremainhowevertoshowthatthehumiditywas

higher than the set value at least once in the past. Toggle the rear humidity % limit switch to

turnoffthearrow.

PracticalConsiderations

TheBasics

TheRH30thermo‐hygrometermonitorsambientroomconditionsandalertstheuserwhen the

relativehumidity exceeds the user programmedlimit (use therear humidity 55/60/65%switch

tosetthelimit).

Excessivelyhumidroomaircanaffecthealth,promotingtheformationofmoistureandmold.At

the other extreme,

 excessively dry room air can also affect health by drying skin, mucous

membranes,and airways. Pets, houseplants, wood flooring, antique  furniture, fine art, musical

instruments, etc. are all affected by extremes in ambient conditions. Effective heating and

ventilation can help achieve a comfortable and healthy living environment and  can also

cut

costs.

TheBenefitsofVentilation

Forrooms thataretoohumid, ventilationatfirstmayseemabadideainwinterwhenoutdoor

air is also cold, damp, and just as humid. Cold air however can absorb little or no moisture.

When cold air enters a living area it becomes

 warmer and can therefore absorb much more

watervapor;inonlyafewminutesthehumiditydecreases.

4RH30‐en‐GB_v1.57/15

DewPointTemperature

DewPointisawindowintotherelationshipbetweenTemperatureandHumidity.Forexample,if

air is cooled at a constant (absolute) humidity, the relative humidity will steadily increase to a

maximumof100%. Iftheairiscooledfurther,theexcesswatervaporwillseparateinthe

form

ofwaterdroplets.IftheRH30indicatesanairtemperatureof20

C(60

F)andarelativehumidity

of65%,thedew‐pointtemperaturewillbe13.2

C(56

F).Thismeansthatifwallsorceilingsina

living area are cooler than 13.2

C (56

F), the air will condense and form droplets on the walls

andceilingsurfaces.Moldanddamppatchescanresult. Inthissameexample,whentherelative

humidityoftheairis40%,thedewpointtemperatureisonly6

C(43

F).Surfaceswouldhaveto

besignificantlycolderfortheairtoreachitsdewpointtoformwaterdroplets.

TipsonAchievingOptimumAmbientConditions

o Checkthatthedewpointtemperatureofwallsisatleast15

C(59

F).

o Donotswitchoffhomeheatingcompletelywhenleavingthehouse.

o Ventilateforshortperiodsonlyinallweatherconditions,evenduringrain.

o Airroomsbyopeningwindowsforashorttimeonly.Partiallyopenedwindowsforprolonged

periodsdonotyieldthedesiredresults,wasteenergy,

andcanfurtherpromotethegrowthof

mold.

o If room air is too dry (as it tends  to be in winter), humidifier units are highly recommended

sinceairingatlowoutdoortemperatureswilltendtodecreasehumidityfurther.



Specifications

Display  Multi‐functionLCD

Sensor  Precisionhumiditysensorforquickandaccuratereadings

Measurementrange RelativeHumidity:1.0to99.0%RH

AirTemperatureand

DewPointTemperature: ‐10to50

C(14to122

F)

Resolution 0.1

C(

F)and%

HumidityAccuracy ±4%from35%to75%otherwise±5%

Temp.Accuracy ±1.0

C(1.8

F)

Powersupply 2x1.5VAAbatteries

Dimensions 95x25x95mm(3.7x1.0x3.7")

Weight  90g(3.2oz.)instrumentonly,batteriesnotincludedinweightspec.



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

ISO-9001 Certified

www.extech.com



Extech Instruments RH30 User manual

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