HK Instruments RHT Series User manual

Copyright HK Instruments 2021 www.hkinstruments. Installaon version 7.0 2021
INSTALLATION
INSTRUCTIONS
HUMIDITY TRANSMITTERS
RHT Series
• READ THESE INSTRUCTIONS CAREFULLY BEFORE
ATTEMPTING TO INSTALL, OPERATE OR SERVICE THIS
DEVICE.
• Failuretoobservesafetyinformaonandcomplywith
instruconscanresultinPERSONALINJURY,DEATHAND/OR
PROPERTY DAMAGE.
• Toavoidelectricalshockordamagetoequipment,disconnect
powerbeforeinstallingorservicinganduseonlywiringwith
insulaonratedforfulldeviceoperangvoltage.
• Toavoidpotenalreand/orexplosiondonotuseinpotenally
ammableorexplosiveatmospheres.
• Retaintheseinstruconsforfuturereference.
• Thisproduct,wheninstalled,willbepartofanengineered
systemwhosespecicaonsandperformancecharacteriscs
arenotdesignedorcontrolledbyHKInstruments.Review
applicaonsandnaonalandlocalcodestoassurethatthe
installaonwillbefunconalandsafe.Useonlyexperiencedand
knowledgeabletechnicianstoinstallthisdevice.
SPECIFICATIONS
ThankyouforchoosinganHKInstrumentsRHTseriesrelavehu-
miditytransmier.TheRHTseriesisintendedforuseincommercial
environmentsinHVAC/Rapplicaons.
TheRHTseriesmeasuresrelavehumidity(rH)andtemperature(T).
Eachmeasurementparameter(rH,T)hasaseparateeldcongur-
ableoutput.
The RHT series relave humidity transmiers are available with
Modbusconguraon,relayandtouchscreendisplay.
RHTseriesdevicesarecommonlyusedtomonitor:
•humidityandtemperaturelevelsinoces,publicspaces,hospitals,
meengroomsandclassrooms
•humidityandtemperatureinvariouscommercialapplicaons
•humidityandtemperatureinHVAC/Renvironment
SPECIFICATIONS
Performance
Measurement ranges:
Temperature:0...50°C
Relavehumidity:0–100%
Accuracy:
Temperature:<0.5ºC
Relavehumidity:±2...3%at0...50°Cand10–90%rH
Totalerrorbandincludesaccuracy,hysteresisand
temperatureeectover5...50°Cand10–90%rH.
Technical Specicaons
Media compability:
Dryairornon-aggressivegases
Measuring units:
°Cand%rH
Measuring element:
Temperature:Integrated
Relavehumidity: Thermosetpolymercapacive
sensingelement
Environment:
Operangtemperature:0...50°C
Storagetemperature:-20...70°C
Humidity:0to95%rH,noncondensing
Physical
Dimensions:
Case:99x90x32mm
Weight:
150g
Mounng:
3screwholessloed,3.8mm
Materials:
Case:ABS
Protecon standard:
IP20
Display (Oponal)
Touchscreen
Size:77.4x52.4mm
Electrical connecons:
Powersupply:
 5-screwterminalblock
 (24V,GND,rH,T,Maxvalue)
 0.2–1.5mm2(12–24AWG)
Relayout:
 3-screwterminalblock
 (NC,COM,NO)
 0.2–1.5mm2(12–24AWG)
Electrical
Input: 24VACorVDC,±10%
 Currentconsumpon:max90mA(at24V)+ 
 10mAforeachvoltageoutputor20mAforeach
 currentoutput
Temperatureoutputsignal:
 0–10V,R>1kΩ
 2–10V,R>1kΩ(oponalvoltageoutput,displayrequired)
 4–20mA,R<500Ω
Relavehumidityoutputsignal:
 0–10V,R>1kΩ
 2–10V,R>1kΩ(oponalvoltageoutput,displayrequired)
 4–20mA,R<500Ω
Relayout:
 SPDTRelay,250VAC/30VDC/6A
 Adjustableswitchingpointandhysteresis
Conformance
MeetsrequirementsforCEmarking:
EMCDirecve2014/30/EU
RoHSDirecve2011/65/EU
LVDDirecve2014/35/EU
WEEEDirecve2012/19/EU
INTRODUCTION WARNING
APPLICATIONS
COMPANY WITH
MANAGEMENT SYSTEM
CERTIFIED BY DNV GL
= ISO 9001 = ISO 14001 =
RoHS 2
2011/65/EU

Copyright HK Instruments 2021 www.hkinstruments. Installaon version 7.0 2021
SCHEMATICS
DIMENSIONAL DRAWINGS
INSTALLATION
STEP 1: MOUNTING THE DEVICE
1)Mountthedeviceinthedesiredlocaon(seestep1).
2)Routethecablesandconnectthewires(seestep2).
3)Thedeviceisnowreadyforconguraon.
WARNING!Applypoweronlyaerthedeviceisproperlywired.
Figure 1a - Surface mounng
Display locking
jumper
Jumpers
Contact pins for
relay terminal
Contact pins for
terminal block
Terminal block
Terminal block for relay
99.0
90.0
83.0
49.5
14.0
45.0
18.0
Ø 4.0
32.0
YES NO NO
Figure 1b - Mounng orientaon
1)Selectamounnglocaononthewallat1.2–1.8m(4–6)above
theoorandatleast50cm(20in)fromtheadjacentwall.Do
notblockdeviceairventsfromanydireconandleaveatleast
20cm(8in)gaptootherdevices.Locatetheunitinanareawith
goodvenlaonandanaveragetemperature,whereitwillbe
responsivetochangestotheroomcondions.TheRHTshouldbe
mountedonaatsurface.
DonotlocatetheRHTwhereitcanbeaectedby:
•Directsunlight
•Drasordeadareasbehinddoors
•Radiantheatfromappliances
•Concealedpipesorchimneys
•Outsidewallsorunheated/uncooledareas
2)Usethedeviceasatemplateandmarkthescrewholes.
3)Mountthewallplatewithscrews.
•Incorrectinstallaonmaycauseashiintemperatureoutput
•Securethelidwithalockingscrew,iftherelayisconnectedtothe
mainspower.

Copyright HK Instruments 2021 www.hkinstruments. Installaon version 7.0 2021
CAUTION!
•ForCEcompliance,aproperlygroundedshieldingcableis
required.
•Usecopperwireonly.Insulateorwirenutallunusedleads.
•Supplyaseparatecableforrelayandsignaloutwhenusingline
voltagetopowertherelay.
•Anywiringmaycarrythefulloperanglinevoltagecurrentbased
oneldinstallaon.Thecoverlockingscrewmustbeinstalledif
thelinevoltageissuppliedtotherelay.
•Careshouldbeusedtoavoidelectrostacdischargetothedevice.
•Thisunithasconguraonjumpers.Youmayneedtorecongure
thisdeviceforyourapplicaon.
1)Routethecablesthroughthesquareopeninginthebackplateor
forsurfacewiringselectaknockoutonthetoporboomofthe
wallplate,asshowninFigure2a.
2)ConnectthewiresasshowninFigure2band2c.
STEP 3: CONFIGURATION
WIRING DIAGRAMS CONTINUED
ConguraonoftheRHTseriesdeviceconsistsof:
1)Conguringthejumpers(seestep4).
2)Conguraonmenuopons.(Display-andModbusversions
only.Seetheusermanualforfurtherdetails.)
Figure 2a - Roung the cables
24 V
GND
Max
rH
Temp
+
Output 0/2–10 V / 4–20 mA
Output 0/2–10 V / 4–20 mA
Output 0/2–10 V / 4–20 mA
Figure 2b - Wiring diagram: Power input & signal output
Wires can be routed through the square opening in the back plate
Wires can be routed through the top knockouts
Wires can be routed through the boom knockouts
NC
COM
NO
STEP 2: WIRING DIAGRAMS
Figure 2d - Wiring diagram: Relay
24 V
GND
Max
rH
+
Temp
V V V
Output 0/2...10 V
Output 0/2...10 V
Output 0/2...10 V
Figure 2c - Wiring diagram: Extra GND wire
NOTE!Whenusinglongconneconwiresitmaybenecessaryto
useaseparateGNDwireforvoltageoutputcurrenttoprevent
measurementdistoron.TheneedforanextraGNDwiredepends
onthecrossseconandlengthoftheusedconneconwires.Iflong
and/orsmallcrossseconwiresareused,supplycurrentandwire
resistancemaygenerateavoltagedropinthecommonGNDwire
resulnginadistortedoutputmeasurement.

Copyright HK Instruments 2021 www.hkinstruments. Installaon version 7.0 2021
1)Conguraonoftheoutputmodesof:
•Maxvalue
•Relavehumidity(rH)
•Temperature(Temp)
Selecttheoutputmode,current(4–20mA)orvoltage(0–10V),
byinstallingjumpersasshowninFigure4.Eachoutputarecongured
separately.
Toselect2–10Voutputmodeonadisplayversiondevice:
First,select0–10Voutputbyjumper(s),thenchangethevoltage(V)
outputfrom0–10Vto2–10Vviatheconguraonmenu.Please
seetheusermanualformoredetails.
Thesellerisobligatedtoprovideawarrantyofveyearsforthedeliv-
eredgoodsregardingmaterialandmanufacturing.Thewarrantyperiod
isconsideredtostartonthedeliverydateoftheproduct.Ifadefectin
rawmaterialsoraproduconawisfound,thesellerisobligated,when
theproductissenttothesellerwithoutdelayorbeforeexpiraonof
thewarranty,toamendthemistakeathis/herdiscreoneitherbyre-
pairingthedefecveproductorbydeliveringfreeofchargetothebuy-
eranewawlessproductandsendingittothebuyer.Deliverycosts
fortherepairunderwarrantywillbepaidbythebuyerandthereturn
costsbytheseller.Thewarrantydoesnotcomprisedamagescausedby
accident, lightning, ood or other natural phenomenon, normal wear
andtear,improperorcarelesshandling,abnormaluse,overloading,im-
properstorage,incorrectcareorreconstrucon,orchangesandinstal-
laonworknotdonebythesellerorhis/herauthorizedrepresentave.
Theseleconofmaterialsfordevicespronetocorrosionisthebuyer’s
responsibility,unlessotherwiseislegallyagreedupon.Shouldtheman-
ufactureralterthestructureofthedevice,thesellerisnotobligatedto
makecomparablechangestodevicesalreadypurchased.Appealingfor
warrantyrequiresthatthebuyerhascorrectlyfullledhis/herdues
arisenfromthedeliveryandstatedinthecontract.Thesellerwillgive
anewwarrantyforgoodsthathavebeenreplacedorrepairedwithin
thewarranty,howeveronlytotheexpiraonoftheoriginalproduct’s
warrantyme.Thewarrantyincludestherepairofadefecvepartor
device, orif needed,a new part ordevice,butnotinstallaonorex-
change costs. Under no circumstance is theseller liable for damages
compensaonforindirectdamage.
2)Lockingthedisplay:
Installthejumpertolockthedisplaytopreventaccesstothecongu-
raonmenuaerinstallaoniscompleted(seetheschemacsforthe
locaonofthepins).
Jumper installed to the le side pins:
0–10 V output selected
Max value
rH
Temp
0–10 V 4–20 mA
Jumper installed to the right side pins:
4–20 mA output selected
Max value
rH
Temp
0–10 V 4–20 mA
First jumper installed to the le side pins:
0-10 V output selected for Max value
Second jumper installed to the right side pins:
4–20 mA output selected for rH
Third jumper installed to the le side pins
0–10 V output selected for temperature
Max value
rH
Temp
0–10 V 4–20 mA
Figure 4
STEP 4: Jumper settings
WARRANTY POLICY
RECYCLING/DISPOSAL
The parts le over from installaon should be
recycled according to your local instrucons.
Decommissioned devices should be taken to a
recyclingsitethatspecializesinelectronicwaste.
(Grey colour indicates that a jumper is installed)
No jumper
Circuit open
Jumper installed
Circuit closed
Jumper stored
Figure 3 - Jumper installaon