HK Instruments RHT-MOD Duct Series User manual

Copyright HK Instruments 2021 www.hkinstruments. Installaon version 7.0 2021
INSTALLATION
INSTRUCTIONS
HUMIDITY TRANSMITTERS
RHT-MOD Duct 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-MOD Duct se-
riesrelavehumiditytransmierwithModbusinterface.TheRHT
-MODDuctseriesisintendedforuseincommercialenvironments
inHVAC/Rapplicaons.
RHT-MODDuctisarelavehumiditytransmierwithtemperature
outputinstalledinairvenlaonduct.Inaddiontothesemeasured
values,RHT-MODDuctcalculatesvariousparameterssuchasdew
point,mixingrao,enthalpyandabsolutehumidity.Illuminateddis-
playensureseasyreadabilityalsofrom adistance.The RHT-MOD
Ducthas a screwless lid and an easily adjustable mounng ange
thatmaketheinstallaonofthedeviceeasy.
RHT-MOD Duct series devices are commonly used to monitor and
control:
•Relavehumidityandtemperaturelevelsofincomingandreturnair
invenlaonsystem
SPECIFICATIONS
Performance
Measurement ranges:
Temperature:-30...80°C,sensor
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:NTC10k
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:119x95.5x45mm
Probe:L=188mm,d=12mm
Mounng:
Withange,adjustable40...155mm
Weight:
150g
Materials:
Case:ABS
Cover:PC
Probe:ABS
Mounngange:LLPDP
Protecon standard:
IP54
Electrical connecons:
 4springloadedterminals
Powersupply:
 (24VandGND)
 0.2–1.5mm2(16–24AWG)
ModbusRTU:
 AandBline
 0.2–1.5mm2(16–24AWG)
Electrical
Supplyvoltage:24VACorVDC±10%
Currentconsumpon:max90mA(at24V)+10mAfor
eachvoltageoutput
Communicaon
Protocol:MODBUSoverSerialLine
TransmissionMode:RTU
Interface:RS485
Byteformat(11bits)inRTUmode:
 CodingSystem:8-bitbinary
 BitsperByte:
  1startbit
  8databits,leastsignicantbitsent
  rst
  1bitforparity
  1stopbit
Baudrate:selectableinconguraon
Modbusaddress:1−247addressesselectablein
conguraonmenu
Conformance
Meetstherequirementsfor:
  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 WARNING
APPLICATIONS
RoHS
COMPLIANT

Copyright HK Instruments 2021 www.hkinstruments. Installaon version 7.0 2021
Tighten the
screw
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.
1)Selectthemounnglocaon(onaduct).
2)Usethemounngangeofthedeviceasatemplateandmarkthe
screwholes.
3)Mounttheangeontheductwithscrews(notincluded).(Figure1a)
4)Adjusttheprobetothedesireddepth.Ensurethattheendofthe
probereachesthemiddleoftheduct.(Figure1b)
5)Tightenthescrewontheangetoholdtheprobeinposion.
Figure 1a - Mounng a ange
Figure 1b - Mounng the probe in a ange
Air flow direcon Air flow direcon
Air flow direcon Air flow direcon Air flow direcon
Strain relief facing down
Figure 1c - Mounng orientaon
Display connecon
Terminal block
A
B
24 V
GND
Joysck 1
Joysck 2
Joysck 3
Select
Up
Down
Menu buons
95.5
88.5
45.0
188.0

Copyright HK Instruments 2021 www.hkinstruments. Installaon version 7.0 2021
STEP 3: CONFIGURATION
ForCEcomplianceaproperlygroundedshieldingcableis
required.
1)Unscrewthestrainreliefandroutethecable(s).
2)Connectthewiresasshowningure2a.
3)Tightenthestrainrelief.
A
24 V
GND
+ Power Supply
24VDC / 24VAC
Modbus A
Modbus B B
1)AcvatethedeviceMenubypushingthetheselectbuonfor2
seconds.
8)Selecttemperatureoset:+-5°C.
Funcon04-Readinputregister
Register Parameter descripon Data Type Value Range
3x0001 Programversion 16bit 0...1000 0.0...99.00
3x0003 rHreading 16bit 0...1000 0.0...100.0%
3x0004 Temp.reading 16bit -300...800 -30.0...80.0°C
3x0006 RHOset 16bit -100...100 -10.0...10.0%rH
3x0007 TEOset 16bit -50...50 -5.0...5.0°C
3x0008 Dewpoint 16bit -300...800 -30.0...80.0°C
3x0009 Absolutehumidity 16bit 0...800 0.0...80.0g/m³
3x0010 Enthalpy 16bit 0...850 0.0...85.0kJ/kg
3x0011 Mixingrao 16bit 0...800 0.0...80.0g/kg
STEP 2: WIRING DIAGRAMS
Figure 2 - Wiring diagram
ADDRESS
1
SELECT
UP
DOWN
5)Selectthebaudrate:9600/19200/38400/57600.
BAUD RATE
9600
SELECT
UP
DOWN
6)Selecttheparitybit:None/Even/Odd.
PARITY BIT
NONE
SELECT
UP
DOWN
7)Selecthumidityoset:+-10%rH,Osetfeatureenableseld
calibraon.Thisisnecessaryindemandingapplicaonsrequiring
annualcalibraon.
RH OFFSET
0.0 %RH
SELECT
UP
DOWN
TE OFFSET
0.0 °C
SELECT
UP
DOWN
9)Pushtheselectbuontoexitmenu.
SELECT
EXIT MENU SELECT
4)SelecttheaddressforModbus:1...247.
ConguraonoftheRHT-MODDuctseriesdeviceconsistsof
conguraonmenuopons(displayversionsonly).
Presstheselectbuontoacceptchanges.Movetothenextseng
bypressingthedownbuon.Selecttheexitmenutosavethe
sengs.Ifthebuonsareunusedfor3minutes,thebasicviewwill
reappearautomacally,andthechangedsengsarenotsaved.
2)Selectthevalueshownonthedisplayrow1.
 (temperature/dewpoint/mixingrao/enthalpy/
 absolutehumidity/relavehumidity)
DISPLAY ROW1
DEW POINT
SELECT
UP
DOWN
3)Selectthevalueshownonthedisplayrow2.
 (temperature/dewpoint/mixingrao/enthalpy/
 absolutehumidity/relavehumidity)
SELECT
UP
DOWN
DISPLAY ROW2
ENTHALPY
Funcon03-Readinputholdingregister
Register Parameter descripon Data Type Value Range
4x0002 RHOset 16bit -100...100 -10.0...10.0%rH
4x0003 TEOset 16bit -50...50 -5.0...5.0°C
STEP 4: MODBUS REGISTERS
CONFIGURATION continued

Copyright HK Instruments 2021 www.hkinstruments. Installaon version 7.0 2021
WARRANTY POLICY
Thesellerisobligatedtoprovideawarrantyofveyearsforthede-
livered 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ob-
ligated,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repairingthedefecveproductorbydeliveringfreeof
chargetothebuyer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phenom-
enon,normalwearandtear,improperorcarelesshandling,abnormal
use,overloading,improperstorage,incorrectcareorreconstrucon,
orchangesandinstallaonworknotdonebytheseller.Theselecon
ofmaterialsfordevicespronetocorrosionisthebuyer’sresponsibil-
ity,unlessotherwiseislegallyagreedupon.Shouldthemanufacturer
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
exchangecosts.Undernocircumstanceisthesellerliablefordamages
compensaonforindirectdamage.
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.