HK Instruments CDT-MOD-2000 Series User manual

Copyright HK Instruments 2022 www.hkinstruments. Installaon version 8.0 2022
INSTALLATION
INSTRUCTIONS
CARBON DIOXIDE TRANSMITTERS
CDT-MOD-2000 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.
Thank you for choosing an HK Instruments CDT-MOD-2000 series
carbon dioxide transmier. The CDT-MOD-2000 series is intended
for use in commercial environments in HVAC/R applicaons. The
CDT-MOD-2000 series measures carbon dioxide (CO2), ulizing the
industrystandardNDIRmeasurementprinciple,andtemperature(T).
Oponal relave humidity (rH) measurement is also available in the
same device. The CDT-MOD-2000 series devices are available with
largetouchscreendisplaymakingtheconguraonofthedevicequick
andeasy.ConguraonisalsopossibleviaModbusnetwork.
The CDT-MOD-2000 series transmiers calibrate themselves auto-
macallyusingABCTMlogic.TheABCTMlogicrequiresthatthespacein
whichthetransmierisusedneedstotobeunoccupiedforfourhours
per day so that the indoor CO2 concentraon drops to the outside
level.CDT-MOD-2000-DCisadualchannelmodelwithameasuring
channelandareferencechannelthatmakesaconnuouscomparison
and the necessary adjustment accordingly. CDT-MOD-2000-DC is
alsosuitableforbuildingsthatareconnuouslyoccupied.
•humidityinvariousindustrialapplicaons
•temperaturesinHVAC/Renvironment
•CDT-MOD-2000-DCseriesdevicescanalsobeusedinapplicaons
wherethereisaconstantsourceofcarbondioxidepresent(for
examplehospitalsandgreenhouses)
SPECIFICATIONS
Performance
Measurement ranges:
CO2:400–2000ppm
Temperature:0...50°C
Relavehumidity:0–100%
Accuracy:
CO2:±40ppm+3%ofreading,DCmodel:75ppmor10%
ofreading(whicheverisgreater)
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:
ppm,°Cand%rH
Measuring element:
CO2:Non-dispersiveinfrared(NDIR)
Temperature: Pt1000(modelswithoutrH-measurement)
 Integrated(modelswithrH-measurement)
Relavehumidity:Thermosetpolymercapacivesensing
element
Calibraon:
Automacself-calibraonABCLogicTMorconnuous
comparison(DC)
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)
 0.2–1.5mm2(16–24AWG)
Relay out:
 3-screwterminalblock
 (NC,COM,NO)
 0.2–1.5mm2(16–24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
Relay out:
 SPDTRelay,250VAC/30VDC/6A
 Adjustableswitchingpointandhysteresis
Oneanalogoutputforselectedmedia:
0/2*–10VDC,LoadRminimum1kΩ
*(2–10VDCdisplaymodelsonly) or
4–20mA,maximumload500Ω
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requirementsfor:
  CE:  UKCA:
EMC:  2014/30/EU S.I.2016/1091
RoHS:  2011/65/EU S.I.2012/3032
LVD/EESR: 2014/35/EU S.I.2016/1101
WEEE:  2012/19/EU S.I.2013/3113
INTRODUCTION
APPLICATIONS
WARNING
CDT-MOD-2000seriesdevicesarecommonlyusedtomonitor:
• CO2andhumiditylevelsinoces,publicspaces,meengrooms
andclassrooms
• CO2levelsofreturnairinvenlaonsystems
•incomingairandreturnairhumiditylevelsinvenlaonsystem
RoHS
COMPLIANT

Copyright HK Instruments 2022 www.hkinstruments. Installaon version 8.0 2022
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
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CDT-MOD
shouldbemountedonaatsurface.
DonotlocatetheCDT-MOD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
Display locking
jumper
Output mode
selecon
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

Copyright HK Instruments 2022 www.hkinstruments. Installaon version 8.0 2022
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CDT-MOD-2000seriesdeviceconsistsof:
1)Conguringthejumpers(seestep4)
2)Conguraonmenuopons.(Displayversionsonly.Seethe
usermanualforfurtherdetails)
Figure 2a - Roung 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 boom knockouts
Figure 2d - Wiring diagram: Relay
NC
COM
NO
STEP 2: WIRING DIAGRAMS
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cur-
rentandwireresistancemaygenerateavoltagedropinthecommonGNDwire
resulnginadistortedoutputmeasurement.WhenusingACpowersupply,make
surethatthegroundpotenalofthesignalisthesameasthegroundpotenalof
thesupplyvoltagetoavoidshortcircuitthroughtheaddionalGNDwire.
Itisrecommendedtouseshieldedtwistedpaircableformodbuscabling.
Thecableshieldmustbeearthedonlyinonepoint,normally,attheendof
themaincable.
24 V
GND
A
B
+
Analog
Output 0/2...10 V
V
output
Figure 2c - Wiring diagram: Extra GND wire
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 installaon
1)Conguraonoftheoutputmodes:
Selecttheoutputmode,current(4–20mA)orvoltage(0–10V),
byinstallingjumpersasshowninFigure4.
Toselect2–10Voutputmodeonadisplayversionofthedevice:
First,select0–10Voutputbyjumper,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.
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)Lockingthedisplay:
Installthejumpertolockthedisplaytopreventaccesstothe
conguraonmenuaerinstallaoniscompleted(seethe
schemacsforthelocaonofthepins).

Copyright HK Instruments 2022 www.hkinstruments. Installaon version 8.0 2022
The seller is obligated to provide a warranty of ve years for the delivered
goods regarding materialand manufacturing. The warranty periodis consid-
ered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 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phenomenon,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responsibility,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war-
ranty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.
Register Parameter descripon Data Type Value Range
4x0001 ParameterforP-controller 16bit 0...3 0=CO2,1=rH,2=TE,3=MAX
4x0002 CO2hIghlimit 16bit 500...2000 500...2000ppm
4x0003 CO2lowlimit 16bit 0...1900 0...1900ppm
4x0004 rHhighlimit 16bit 100...1000 10.0...100.0%
4x0005 rHlowlimit 16bit 0...900 0.0...90.0%
4x0006 TEhighlimit 16bit 50...500 5.0...50.0°C
4x0007 TElowlimit 16bit 0...450 0...45.0°C
4x0008 Parameter for relay 16bit 0...3 0=CO2,1=rH,2=TE,(3=O)
4x0009 CO2relayon 16bit 500...1950 500...1950ppm
4x0010 CO2relayo 16bit 450...1900 450...1900ppm
4x0011 rH relay on 16bit 15...990 1.5...99.0%
4x0012 rHrelayo 16bit 10...985 1.0...98.5%
4x0013 TE relay on 16bit 15...490 1.5...49.0°C
4x0014 TErelayo 16bit 10...485 1.0...48.5°C
4x0015 CO2Oset 16bit -200…200 -200…200ppm
4x0016 RHOset 16bit -100…100 -10.0…10.0%rH
4x0017 TEOset 16bit -50…50 -5.0…5.0°C
Funconcode03-Readinputholdingregister
Funconcode04-Readinputregister
Register Parameter descripon Data Type Value Range
3x0001 ParameterforP-controller 16bit 0...3 0=CO2,1=rH,2=TE,3=MAX
3x0002 CO2reading 16bit 0...2000 0...2000ppm
3x0003 rHreading 16bit 0...1000 0,0...100.0%
3x0004 Temp.reading 16bit 0...500 0.0...50.0°C
3x0005 CO2highlimit 16bit 500...2000 500...2000ppm
3x0006 CO2lowlimit 16bit 0...1900 0...1900ppm
3x0007 rHhighlimit 16bit 100...1000 10.0...100.0%
3x0008 rHlowlimit 16bit 0...900 0.0...90.0%
3x0009 TEhighlimit 16bit 50...500 5.0...50.0°C
3x0010 TElowlimit 16bit 0...450 0...45.0°C
3x0011 Parameter for relay 16bit 0...3 0=CO2,1=rH,2=TE,(3=O)
3x0012 CO2relayon 16bit 500...1950 500...1950ppm
3x0013 CO2relayo 16bit 450...1900 450...1900ppm
3x0 014 rH relay on 16bit 15...990 1.5...99.0%
3x0015 rHrelayo 16bit 10...985 1.0...98,5%
3x0016 TE relay on 16bit 15...490 1.5...49.0°C
3x0017 TErelayo 16bit 10...485 1.0...48.5°C
3x0018 CO2Oset 16bit -200…200 -200…200ppm
3x0 019 RHOset 16bit -100…100 -10.0…10.0%rH
3x0020 TEOset 16bit -50…50 -5.0…5.0°C
3x0021 Programversion 16bit 10…9999 1.0…999.9
MODBUS REGISTERS CONTINUED
Funconcode16-Writemulpleregisters
Register Parameter descripon Data Type Value Range
4x0001 ParameterforP-controller 16bit 0...3 0=CO2,1=rH,2=TE,3=MAX
4x0002 CO2hIghlimit 16bit 500...2000 500...2000ppm
4x0003 CO2lowlimit 16bit 0...1900 0...1900ppm
4x0004 rHhighlimit 16bit 100...1000 10.0...100.0%
4x0005 rHlowlimit 16bit 0...900 0.0...90.0%
4x0006 TEhighlimit 16bit 50...500 5.0...50.0°C
4x0007 TElowlimit 16bit 0...450 0...45.0°C
4x0008 Parameter for relay 16bit 0...3 0=CO2,1=rH,2=TE,(3=O)
4x0009 CO2relayon 16bit 500...1950 500...1950ppm
4x0010 CO2relayo 16bit 450...1900 450...1900ppm
4x0011 rH relay on 16bit 15...990 1.5...99.0%
4x0012 rHrelayo 16bit 10...985 1.0...98.5%
4x0013 TE relay on 16bit 15...490 1.5...49.0°C
4x0014 TErelayo 16bit 10...485 1.0...48.5°C
4x0015 CO2Oset 16bit -200…200 -200…200ppm
4x0016 RHOset 16bit -100…100 -10.0…10.0%rH
4x0017 TEOset 16bit -50…50 -5.0…5.0°C
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.
WARRANTY POLICY
Register Parameter descripon Data Type Value Range
1x0001 Relay status Bit0 0...1 0=O-1=On
1x0002 Relaytrend Bit0 0...1 0=Increasing,1=Decreasing
1x0003 Timer status Bit0 0...1 0=O-1=On
Funconcode02-Readinputstatus
Funconcode06-Writesingleregister
Register Parameter descripon Data Type Value Range
4x0001 ParameterforP-controller 16bit 0...3 0=CO2,1=rH,2=TE,3=MAX
4x0002 CO2hIghlimit 16bit 500...2000 500...2000ppm
4x0003 CO2lowlimit 16bit 0...1900 0...1900ppm
4x0004 rHhighlimit 16bit 100...1000 10.0...100.0%
4x0005 rHlowlimit 16bit 0...900 0.0...90.0%
4x0006 TEhighlimit 16bit 50...500 5.0...50.0°C
4x0007 TElowlimit 16bit 0...450 0...45.0°C
4x0008 Parameter for relay 16bit 0...3 0=CO2,1=rH,2=TE,(3=O)
4x0009 CO2relayon 16bit 500...1950 500...1950ppm
4x0010 CO2relayo 16bit 450...1900 450...1900ppm
4x0011 rH relay on 16bit 15...990 1.5...99.0%
4x0012 rHrelayo 16bit 10...985 1.0...98.5%
4x0013 TE relay on 16bit 15...490 1.5...49.0°C
4x0014 TErelayo 16bit 10...485 1.0...48.5°C
4x0015 CO2Oset 16bit -200…200 -200…200ppm
4x0016 RHOset 16bit -100…100 -10.0…10.0%rH
4x0017 TEOset 16bit -50…50 -5.0…5.0°C
STEP 5: MODBUS REGISTERS
FunconsforModbuscommunicaon:
Funcon Code Descripon
01 Readcoilstatus
02 Readinputstatus
03 Readholdingregisters
04 Readinputregisters
05 Forcesinglecoil
06 Presetsingleregister
07 Readexceponstatus
15 Forcemulplecoils
16 Presetmulpleregisters
17 ReportslaveID
Funconcode05-Writesinglecoil
Register Parameter descripon Data Type Value Range
0x0001 Relaytrend Bit0 0...1 0=Increasing,1=Decreasing