Copyright HK Instruments 2021 www.hkinstruments. Installaon version 8.0 2021
INSTALLATION
INSTRUCTIONS
HUMIDITY TRANSMITTERS
RHT Duct Series
• READ THESE INSTRUCTIONS CAREFULLY BEFORE
ATTEMPTING TO INSTALL, OPERATE OR SERVICE THIS
DEVICE.
• Failuretoobservesafetyinformaonandcomplywith
instruconscanresultinPERSONALINJURY,DEATHAND/OR
PROPERTY DAMAGE.
• Toavoidelectricalshockordamagetoequipment,disconnect
powerbeforeinstallingorservicinganduseonlywiringwith
insulaonratedforfulldeviceoperangvoltage.
• Toavoidpotenalreand/orexplosiondonotuseinpotenally
ammableorexplosiveatmospheres.
• Retaintheseinstruconsforfuturereference.
• Thisproduct,wheninstalled,willbepartofanengineered
systemwhosespecicaonsandperformancecharacteriscs
arenotdesignedorcontrolledbyHKInstruments.Review
applicaonsandnaonalandlocalcodestoassurethatthe
installaonwillbefunconalandsafe.Useonlyexperiencedand
knowledgeabletechnicianstoinstallthisdevice.
ThankyouforchoosinganHKInstrumentsRHTDuctseriesrelave
humiditytransmier.TheRHTseriesisintendedforuseincommer-
cialenvironmentsinHVAC/Rapplicaons.
RHTDuctisarelavehumiditytransmierwithtemperatureoutput
installedinairvenlaonduct.Inaddiontothesemeasuredvalues,
RHTDuctcalculatesvariousparameterssuchasdewpoint,mixing
rao, enthalpy and absolute humidity. Illuminated display ensures
easyreadability alsofrom adistance.The RHT hasa screwless lid
andaneasilyadjustablemounngangethatmaketheinstallaon
ofthedeviceeasy.
RHTDuctseriesdevicesarecommonlyusedtomonitorandcontrol:
•Relavehumidityandtemperaturelevelsofincomingandreturnair
invenlaonsystem
SPECIFICATIONS
Performance
Measurement ranges:
Temperature:-30...80°C,sensor
Relavehumidity:0–100%
Accuracy:
Temperature:<0.5ºC
Relavehumidity:±2...3%at0...50°Cand10–90%rH
Totalerrorbandincludesaccuracy,hysteresisand
temperatureeectover5...50°Cand10–90%rH.
Technical Specicaons
Media compability:
Dryairornon-aggressivegases
Measuring units:
°Cand%rH
Measuring element:
Temperature:NTC10k
Relavehumidity:Thermosetpolymercapacive
sensingelement
Environment:
Operangtemperature:0...50°C
Storagetemperature:-20...70°C
Humidity:0to95%rH,noncondensing
Physical
Dimensions:
Case:119x95.5x45mm
Probe:L=188mm,d=12mm
Mounng:
Withange,adjustable40...155mm
Weight:
150g
Materials:
Case:ABS
Cover:PC
Probe:ABS
Mounngange:LLPDP
Protecon standard:
IP54
Electrical connecons:
4springloadedterminals
(24V,GND,OUT1*,OUT2*)
0.2–1.5mm2(16–24AWG)
A-model:
2addionalspringloadedterminals
formA-output(OUT1*,OUT2*)
0.2-1.5mm2(16-24AWG)
*DefaultOUT1=rH,OUT2=TE
Outputsselectableonthedisplay:
temperature/dewpoint/mixingrao/
enthalpy/absolutehumidity/relavehumidity
Electrical
Supplyvoltage:24VACorVDC±10%
Currentconsumpon:max90mA(at24V)+10mAfor
eachvoltageoutput
Outputsignalsforeverymedia:
0/2...5/10VDC,LoadRminimum1kΩ
OnlyA-model:
4...20mA,LoadRmaximum500Ω,minimum20Ω
Outputcalibratedwithin±0.08mA
Conformance
Meetstherequirementsfor:
CE: UKCA:
EMC: 2014/30/EU S.I.2016/1091
RoHS: 2011/65/EU S.I.2012/3032
WEEE: 2012/19/EU S.I.2013/3113
INTRODUCTION
APPLICATIONS
WARNING
RoHS
COMPLIANT
Copyright HK Instruments 2021 www.hkinstruments. Installaon version 8.0 2021
SCHEMATICS
DIMENSIONAL DRAWINGS
INSTALLATION
STEP 1: MOUNTING THE DEVICE
1)Mountthedeviceinthedesiredlocaon(seestep1).
2)Routethecablesandconnectthewires(seestep2).
3)Thedeviceisnowreadyforconguraon.
WARNING!Applypoweronlyaerthedeviceisproperlywired.
1)Selectthemounnglocaon(onaduct).
2)Usethemounngangeofthedeviceasatemplateandmarkthe
screwholes.
3)Mounttheangeontheductwithscrews(notincluded).(Figure
1a)
4)Adjusttheprobetothedesireddepth.Ensurethattheendofthe
probereachesthemiddleoftheduct.(Figure1b)
5)Tightenthescrewontheangetoholdtheprobeinposion.
Figure 1a - Mounng a ange
Figure 1b - Mounng the probe in a ange
Air flow direcon Air flow direcon
Air flow direcon Air flow direcon Air flow direcon
Strain relief facing down
Figure 1c - Mounng orientaon
Display connecon
OUT 2
24 V
GND
Joysck 1
Joysck 2
Joysck 3
Select
Up
Down
Menu buons OUT 1
mA Out (oponal)
OUT 1
OUT 2
119.0
95.5
119.0
45.0
88.5
188.0
Tighten the
screw
Copyright HK Instruments 2021 www.hkinstruments. Installaon version 8.0 2021
STEP 3: CONFIGURATION
CONFIGURATION CONTINUED
ConguraonoftheRHTDuctseriesdeviceconsistsof:
Conguraonmenuopons.(Displayversionsonly.)
Presstheselectbuontoacceptchanges.Movetothenextset-
ngbypressingthedownbuon.Selecttheexitmenutosavethe
sengs.Ifthebuonsareunusedfor3minutes,thebasicviewwill
reappearautomacallyandthechangedsengsarenotsaved.
1)AcvatethedeviceMenubypushingtheselectbuonfor2
seconds.
ForCEcomplianceaproperlygroundedshieldingcableis
required.
1)Unscrewthestrainreliefandroutethecable(s).
2)Connectthewiresasshowningure2.
3)Tightenthestrainrelief.
OUT 1
OUT 2
24 V
GND
+Power Supply
24VDC / 24VAC
Output 0/2...5/10 V
Output 0/2...5/10 V
OUT 1
OUT 2
Output 4...20 mA
Output 4...20 mA Oponal mA output
OUTPUT 1
RH
SELECT
UP
DOWN
5)Selecttheoutput2value.
(temperature/dewpoint/mixingrao/enthalpy/
absolutehumidity/relavehumidity)
SELECT
UP
DOWN
OUTPUT 2
TEMPERATURE
7)Selecttheoutputrange(0...10V,2...10Vor0...5V)
OUT VOLTAGE
0- 10 V
SELECT
UP
DOWN
10)Pushtheselectbuontoexitmenu.
SELECT
EXIT MENU SELECT
STEP 2: WIRING DIAGRAMS
Figure 2 - Wiring diagram
8)Selecthumidityoset:±10%rH,Osetfeatureenables
eldcalibraon.Thisisnecessaryindemandingapplicaons
requiringannualcalibraon.
9)Selecttemperatureoset:±5°C.
RH OFFSET
0.0 %RH
SELECT
UP
DOWN
TE OFFSET
0.0 °C
SELECT
UP
DOWN
4)Selecttheoutput1value.
(temperature/dewpoint/mixingrao/enthalpy/
absolutehumidity/relavehumidity)
6.1)Setthelowlimitfortheoutput1(selectedinstep4).
RH OUT MIN
0.0 %RH
SELECT
UP
DOWN
6.2)Setthehighlimitfortheoutput1(selectedinstep4).
SELECT
UP
DOWN
RH OUT MAX
100.0 %RH
2)Selectthevalueshownonthedisplayrow1.
(temperature/dewpoint/mixingrao/enthalpy/
absolutehumidity/relavehumidity)
DISPLAY ROW1
DEW POINT
SELECT
UP
DOWN
SELECT
UP
DOWN
DISPLAY ROW2
ENTHALPY
3)Selectthevalueshownonthedisplayrow2.
(temperature/dewpoint/mixingrao/enthalpy/
absolutehumidity/relavehumidity)
6)Setthelimitsfortheoutputs.
NOTE!Onlyselectedoutputsareshown.
Measurement Default range
Adjustable
low limit
Adjustable
high limit
Smallest range
available
Relavehumidity(RH) 0...100%rH 0...90%rH 10...100%rH 10%rH
Temperature(TE) 0...50°C -30...45°C 5...80°C 5°C
Dewpoint(DP)* -20...80°C -30...70°C -20...80°C 10°C
Mixingrao(MR)* 0...80g/kg -30...70g/kg 20...80g/kg 10g/kg
Enthalpy(ENT)* 0...85kJ/kg 0...85kJ/kg 5...90kJ/kg 5kJ/kg
Absolutehumidity(AH)* 0...80g/m³0...70g/m³10...80g/m³10g/m³
*)calculaonisbasedontemperatureandhumiditymeasurementsandconstant
pressurep=1013mBar
*)totalaccuracyisbasedontheaccuraciesofthemeasuredvalues(TandrH)andthedeviaon
fromtheassumedpressurep=1013mBar
High
limit
Low
limit
5/10 V
20 mA
0/2 V
4 mA
6.3)Setthelowlimitfortheoutput2(selectedinstep5).
TE OUT MIN
0.0 °C
SELECT
UP
DOWN
6.4)Setthehighlimitfortheoutput2(selectedinstep5).
SELECT
UP
DOWN
TE OUT MAX
50.0 °C
Copyright HK Instruments 2021 www.hkinstruments. Installaon version 8.0 2021
WARRANTY POLICY
Thesellerisobligatedtoprovideawarrantyofveyearsforthedeliv-
eredgoodsregardingmaterialandmanufacturing.Thewarrantyperiod
isconsidered tostartonthe deliverydate oftheproduct.Ifa defect
in raw materialsora producon aw isfound, theseller isobligated,
whentheproductissenttothesellerwithoutdelayorbeforeexpira-
onofthewarranty,toamendthemistakeathis/herdiscreoneither
by repairing the defecve product or by delivering free of charge to
thebuyeranewawlessproductandsendingittothebuyer.Delivery
costsfor therepairunderwarranty willbepaidbythebuyerandthe
return costs by the seller. The warranty does not comprise damages
causedbyaccident,lightning,oodorothernaturalphenomenon,nor-
malwearandtear,improperorcarelesshandling,abnormaluse,over-
loading,improperstorage,incorrectcareorreconstrucon,orchanges
andinstallaonworknotdonebytheseller.Theseleconofmaterials
fordevicespronetocorrosionisthebuyer’sresponsibility,unlessother-
wiseislegallyagreedupon.Shouldthemanufactureralterthestructure
ofthedevice, thesellerisnotobligatedtomakecomparablechanges
todevicesalreadypurchased.Appealingforwarrantyrequiresthatthe
buyerhascorrectlyfullledhis/herduesarisenfromthedeliveryand
stated in the contract. The seller will give a new warranty for goods
thathavebeenreplacedorrepairedwithinthewarranty,howeveronly
totheexpiraonoftheoriginalproduct’swarrantyme.Thewarranty
includestherepairofadefecvepartordevice,orifneeded,anewpart
ordevice,butnotinstallaonorexchangecosts.Undernocircumstance
isthesellerliablefordamagescompensaonforindirectdamage.
RECYCLING/DISPOSAL
The parts le over from installaon should be
recycled according to your local instrucons.
Decommissioned devices should be taken to a
recyclingsitethatspecializesinelectronicwaste.
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