HK Instruments RHT-MOD-Series Humidity Transmitters User manual
- Type
- User manual
HK Instruments RHT-MOD-Series Humidity Transmitters accurately measure humidity and temperature in commercial environments, including offices, hospitals, and HVAC/R applications. With a large touchscreen display, configuration is quick and easy, allowing users to customize settings and monitor readings. The RHT-MOD-Series features a polymer capacitive sensing element for precise relative humidity measurement and an integrated sensor for temperature, providing reliable data for various applications.
HK Instruments RHT-MOD-Series Humidity Transmitters accurately measure humidity and temperature in commercial environments, including offices, hospitals, and HVAC/R applications. With a large touchscreen display, configuration is quick and easy, allowing users to customize settings and monitor readings. The RHT-MOD-Series features a polymer capacitive sensing element for precise relative humidity measurement and an integrated sensor for temperature, providing reliable data for various applications.
Copyright HK Instruments 2021 www.hkinstruments. Installaon version 7.0 2021
INSTALLATION
INSTRUCTIONS
HUMIDITY TRANSMITTERS
RHT-MOD 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.
SPECIFICATIONS
Thank you for choosing an HK Instruments RHT-MOD series rela-
vehumiditytransmier.TheRHT-MODseriesisintendedforusein
commercialenvironmentsinHVAC/Rapplicaons.
TheRHT-MODmeasuresrelavehumidity(rH),andtemperature(T).
RHT-MODdevicesareavailablewithlargetouchscreendisplaymak-
ingconguraonofthedevicequickandeasy.
RHT-MODseriesdevicesarecommonlyusedtomonitor:
•humidityandtemperaturelevelsinoces,publicspaces,hospitals,
meengroomsandclassrooms
•humidityandtemperatureinvariouscommercialapplicaons
•humidityandtemperatureinHVAC/Renvironment
SPECIFICATIONS
Performance
Measurement ranges:
Temperature:0...50°C
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:Integrated
Relavehumidity:Thermosetpolymercapacive
sensingelement
Environment:
Operangtemperature:0...50°C
Storagetemperature:-20...70°C
Humidity:0to95%rH,noncondensing
Physical
Dimensions:
Case:99x90x32mm
Weight:
150g
Mounng:
3screwholessloed,3.8mm
Materials:
Case:ABS
Protecon standard:
IP20
Display
Touchscreen
Size:77.4x52.4mm
Electrical connecons:
Powersupply:
5-screwterminalblock
(24V,GND)
0.2–1.5mm2(12–24AWG)
Relayout:
3-screwterminalblock
(NC,COM,NO)
0.2–1.5mm2(12–24AWG)
Electrical
Input: 24VACorVDC,±10%
Currentconsumpon:max90mA(at24V)+
10mAforeachvoltageoutputor20mAfor
eachcurrentoutput
Relayout:
SPDTRelay,250VAC/30VDC/6A
Adjustableswitchingpointandhysteresis
Oneanalogoutputforselectedmedia:
0/2*–10VDC,LoadRminimum1kΩ
*(2–10VDCdisplaymodelsonly)or
4–20mA,maximumload500Ω
Communicaon
Protocol:MODBUSoverSerialLine
TransmissionMode:RTU
Interface:RS485
Byteformat(11bits)inRTUmode:
CodingSystem:8-bitbinary
BitsperByte:
1startbit
8databits,leastsignicantbitsent
rst
1bitforparity
1stopbit
Baudrate:selectableinconguraon
Modbusaddress:1−247addressesselectablein
conguraonmenu
Conformance
MeetsrequirementsforCEmarking:
EMCDirecve2014/30/EU
RoHSDirecve2002/95/EC
LVDDirecve2014/35/EU
WEEEDirecve2012/19/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. Installaon version 7.0 2021
SCHEMATICS
DIMENSIONAL DRAWINGS
INSTALLATION
STEP 1: MOUNTING THE DEVICE
1)Mountthedeviceinthedesiredlocaon(seestep1).
2)Routethecablesandconnectthewires(seestep2).
3)Thedeviceisnowreadyforconguraon.
WARNING!Applypoweronlyaerthedeviceisproperlywired.
Figure 1a - Surface mounng
1)Selectamounnglocaononthewallat1.2–1.8m(4–6)above
theoorandatleast50cm(20in)fromtheadjacentwall.Do
notblockdeviceairventsfromanydireconandleaveatleast
20cm(8in)gaptootherdevices.Locatetheunitinanareawith
goodvenlaonandanaveragetemperature,whereitwillbe
responsivetochangestotheroomcondions.TheRHT-MOD
shouldbemountedonaatsurface.
DonotlocatetheRHT-MODwhereitcanbeaectedby:
•Directsunlight
•Drasordeadareasbehinddoors
•Radiantheatfromappliances
•Concealedpipesorchimneys
•Outsidewallsorunheated/uncooledareas
2)Usethedeviceasatemplateandmarkthescrewholes.
3)Mountthewallplatewithscrews.
•Incorrectinstallaonmaycauseashiintemperatureoutput
•Securethelidwithalockingscrew,iftherelayisconnectedtothe
mainspower
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 - Mounng orientaon
Copyright HK Instruments 2021 www.hkinstruments. Installaon version 7.0 2021
CAUTION!
•ForCEcompliance,aproperlygroundedshieldingcableis
required.
•Usecopperwireonly.Insulateorwirenutallunusedleads.
•Supplyaseparatecableforrelayandsignaloutwhenusingline
voltagetopowertherelay.
•Anywiringmaycarrythefulloperanglinevoltagecurrentbased
oneldinstallaon.Thecoverlockingscrewmustbeinstalledif
thelinevoltageissuppliedtotherelay.
•Careshouldbeusedtoavoidelectrostacdischargetothedevice.
•Thisunithasconguraonjumpers.Youmayneedtorecongure
thisdeviceforyourapplicaon.
1)Routethecablesthroughthesquareopeninginthebackplateor
forsurfacewiringselectaknockoutonthetoporboomofthe
wallplate,asshowninFigure2a.
2)ConnectthewiresasshowninFigure2band2c.
STEP 3: CONFIGURATION
WIRING DIAGRAMS CONTINUED
Figure 2a - Roung the cables
24 V
GND
A
B
Analog
+
Output 0/2–10 V / 4–20 mA
output
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 boom knockouts
NC
COM
NO
STEP 2: WIRING DIAGRAMS
Figure 2d - Wiring diagram: Relay
NOTE!Whenusinglongconneconwiresitmaybenecessarytousea
separateGNDwireforvoltageoutputcurrenttopreventmeasurementdis-
toron.TheneedforanextraGNDwiredependsonthecrossseconand
lengthoftheusedconneconwires.Iflongand/orsmallcrossseconwires
areused,supplycurrentandwireresistancemaygenerateavoltagedropin
thecommonGNDwireresulnginadistortedoutputmeasurement.
24 V
GND
A
B
+
Analog
Output 0/2...10 V
V
output
Figure 2c - Wiring diagram: Extra GND wire
ConguraonoftheRHT-MODseriesdeviceconsistsof:
1)Conguringthejumpers(seestep4)
2)Conguraonmenuopons.(Displayversionsonly.Seethe
usermanualforfurtherdetails)
STEP 4: Jumper settings
(Grey colour indicates that a jumper is installed)
No jumper
Circuit open
Jumper installed
Circuit closed
Jumper stored
Figure 3 - Jumper installaon
1)Conguraonoftheoutputmodes:
Selecttheoutputmode,current(4–20mA)orvoltage(0–10V),
byinstallingjumpersasshowninFigure4.
Toselect2–10Voutputmodeonadisplayversionofthedevice:
First,select0–10Voutputbyjumper,thenchangethevoltage(V)
outputfrom0–10Vto2–10Vviatheconguraonmenu.Please
seetheusermanualformoredetails.
Copyright HK Instruments 2021 www.hkinstruments. Installaon version 7.0 2021
Thesellerisobligatedtoprovideawarrantyofveyearsforthedeliv-
eredgoodsregardingmaterialandmanufacturing.Thewarrantyperiod
isconsidered tostart on thedelivery dateof theproduct.If a defect
in raw materials or a produconawisfound, theseller is obligated,
whentheproductissenttothesellerwithoutdelayorbeforeexpira-
onofthewarranty,toamendthemistakeathis/herdiscreoneither
byrepairingthedefecveproductorbydeliveringfreeofchargetothe
buyeranewawlessproductandsendingittothebuyer.Deliverycosts
fortherepairunderwarrantywillbepaidbythebuyerandthereturn
costsbytheseller.Thewarrantydoesnotcomprisedamagescausedby
accident, lightning, ood or other natural phenomenon, normal wear
andtear,improperorcarelesshandling,abnormaluse,overloading,im-
properstorage,incorrectcareorreconstrucon,orchangesandinstal-
laonworknotdonebythesellerorhis/herauthorizedrepresentave.
Theseleconofmaterialsfordevicespronetocorrosionisthebuyer’s
responsibility,unlessotherwiseislegallyagreedupon.Shouldtheman-
ufactureralterthestructureofthedevice,thesellerisnotobligatedto
makecomparablechangestodevicesalreadypurchased.Appealingfor
warranty requiresthat the buyer hascorrectly fullledhis/her dues
arisenfromthedeliveryandstatedinthecontract.Thesellerwillgive
anew warrantyforgoodsthat havebeen replacedorrepairedwithin
thewarranty,howeveronlytotheexpiraonoftheoriginalproduct’s
warrantyme.Thewarrantyincludestherepairofadefecvepartor
device, or if needed, a new part or device, but not installaon or ex-
change costs. Under no circumstance is the seller liable for damages
compensaonforindirectdamage.
STEP 5: MODBUS REGISTERS
Register Parameter descripon Data Typ e Value Range
1x0001 Relay status Bit0 0...1 0=O-1=On
1x0002 Relaytrend Bit0 0...1 0=Increasing,1=Decreasing
Funconcode02-Readinputstatus
Register Parameter descripon Data Typ e Value Range
4x0001 ParameterforP-controller 16bit 0...3 1=rH,2=TE,3=MAX
4x0004 rHhighlimit 16bit 100...1000 10.0...100.0%
4x0005 rHlowlimit 16bit 0...900 0.0...90.0%
4x0006 TEhighlimit 16bit 50...500 5.0...50.0°C
4x0007 TElowlimit 16bit 0...450 0...45.0°C
4x0008 Parameter for relay 16bit 0...3 1=rH,2=TE,(3=O)
4x0011 rH relay on 16bit 15...990 1.5...99.0%
4x0012 rHrelayo 16bit 10...985 1.0...98.5%
4x0013 TE relay on 16bit 15...490 1.5...49.0°C
4x0014 TErelayo 16bit 10...485 1.0...48.5°C
Funconcode03-Readinputholdingregister
Funconcode04-Readinputregister
Register Parameter descripon Data Typ e Value Range
3x0001 ParameterforP-controller 16bit 0...3 1=rH,2=TE,3=MAX
3x0003 rHreading 16bit 0...1000 0,0...100.0%
3x0004 Temp.reading 16bit 0...500 0.0...50.0°C
3x0007 rHhighlimit 16bit 100...1000 10.0...100.0%
3x0008 rHlowlimit 16bit 0...900 0.0...90.0%
3x0009 TEhighlimit 16bit 50...500 5.0...50.0°C
3x0010 TElowlimit 16bit 0...450 0...45.0°C
3x0011 Parameter for relay 16bit 0...3 1=rH,2=TE,(3=O)
3x0 014 rH relay on 16bit 15...990 1.5...99.0%
3x0015 rHrelayo 16bit 10...985 1.0...98,5%
3x0016 TE relay on 16bit 15...490 1.5...49.0°C
3x0017 TErelayo 16bit 10...485 1.0...48.5°C
Funconcode05-Writesinglecoil
Register Parameter descripon Data Typ e Value Range
0x0001 Relaytrend Bit0 0...1 0=Increasing,1=Decreasing
FunconsforModbuscommunicaon:
Funcon Code Descripon
01 Readcoilstatus
02 Readinputstatus
03 Readholdingregisters
04 Readinputregisters
05 Forcesinglecoil
06 Presetsingleregister
07 Readexceponstatus
15 Forcemulplecoils
16 Presetmulpleregisters
17 ReportslaveID
MODBUS REGISTERS CONTINUED
Funconcode16-Writemulpleregisters
Register Parameter descripon Data Typ e Value Range
4x0001 ParameterforP-controller 16bit 0...3 1=rH,2=TE,3=MAX
4x0004 rHhighlimit 16bit 100...1000 10.0...100.0%
4x0005 rHlowlimit 16bit 0...900 0.0...90.0%
4x0006 TEhighlimit 16bit 50...500 5.0...50.0°C
4x0007 TElowlimit 16bit 0...450 0...45.0°C
4x0008 Parameter for relay 16bit 0...3 1=rH,2=TE,(3=O)
4x0011 rH relay on 16bit 15...990 1.5...99.0%
4x0012 rHrelayo 16bit 10...985 1.0...98.5%
4x0013 TE relay on 16bit 15...490 1.5...49.0°C
4x0014 TErelayo 16bit 10...485 1.0...48.5°C
RECYCLING/DISPOSAL
The parts le over from installaon should be
recycled according to your local instrucons.
Decommissioned devices should be taken to a
recyclingsitethatspecializesinelectronicwaste.
WARRANTY POLICY
Funconcode06-Writesingleregister
Register Parameter descripon Data Typ e Value Range
4x0001 ParameterforP-controller 16bit 0...3 1=rH,2=TE,3=MAX
4x0004 rHhighlimit 16bit 100...1000 10.0...100.0%
4x0005 rHlowlimit 16bit 0...900 0.0...90.0%
4x0006 TEhighlimit 16bit 50...500 5.0...50.0°C
4x0007 TElowlimit 16bit 0...450 0...45.0°C
4x0008 Parameter for relay 16bit 0...3 1=rH,2=TE,(3=O)
4x0011 rH relay on 16bit 15...990 1.5...99.0%
4x0012 rHrelayo 16bit 10...985 1.0...98.5%
4x0013 TE relay on 16bit 15...490 1.5...49.0°C
4x0014 TErelayo 16bit 10...485 1.0...48.5°C
Jumper settings CONTINUED
Jumper installed to the le side pins:
0–10 V output selected
N/A
N/A
Analog
0...10 V 4...20 mA
Jumper installed to the right side pins:
4–20 mA output selected
N/A
N/A
Analog
0...10 V 4...20 mA
Figure 4
2)Lockingthedisplay:
Installthejumpertolockthedisplaytopreventaccesstothe
conguraonmenuaerinstallaoniscompleted(seethe
schemacsforthelocaonofthepins).
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1
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2
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3
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4
HK Instruments RHT-MOD-Series Humidity Transmitters User manual
- Type
- User manual
HK Instruments RHT-MOD-Series Humidity Transmitters accurately measure humidity and temperature in commercial environments, including offices, hospitals, and HVAC/R applications. With a large touchscreen display, configuration is quick and easy, allowing users to customize settings and monitor readings. The RHT-MOD-Series features a polymer capacitive sensing element for precise relative humidity measurement and an integrated sensor for temperature, providing reliable data for various applications.
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