HK Instruments CDT-MOD-2000 CARBON DIOXIDE TRANSMITTERS Operating instructions
- Type
- Operating instructions
HK Instruments CDT-MOD-2000 CARBON DIOXIDE TRANSMITTERS are versatile devices designed to accurately measure carbon dioxide (CO2) levels, temperature, and relative humidity in various commercial and industrial environments. With their advanced NDIR measurement principle and automatic ABC LogicTM calibration, these transmitters ensure precise and reliable readings. The optional dual-channel model (CDT-MOD-2000-DC) allows continuous comparison and adjustment, making it suitable for areas with constant CO2 sources.
HK Instruments CDT-MOD-2000 CARBON DIOXIDE TRANSMITTERS are versatile devices designed to accurately measure carbon dioxide (CO2) levels, temperature, and relative humidity in various commercial and industrial environments. With their advanced NDIR measurement principle and automatic ABC LogicTM calibration, these transmitters ensure precise and reliable readings. The optional dual-channel model (CDT-MOD-2000-DC) allows continuous comparison and adjustment, making it suitable for areas with constant CO2 sources.
Copyright HK Instruments 2022 www.hkinstruments. Installaon 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.
• Failuretoobservesafetyinformaonandcomplywith
instruconscanresultinPERSONALINJURY,DEATHAND/OR
PROPERTY DAMAGE.
• Toavoidelectricalshockordamagetoequipment,disconnect
powerbeforeinstallingorservicinganduseonlywiringwith
insulaonratedforfulldeviceoperangvoltage.
• Toavoidpotenalreand/orexplosiondonotuseinpotenally
ammableorexplosiveatmospheres.
• Retaintheseinstruconsforfuturereference.
• Thisproduct,wheninstalled,willbepartofanengineered
systemwhosespecicaonsandperformancecharacteriscs
arenotdesignedorcontrolledbyHKInstruments.Review
applicaonsandnaonalandlocalcodestoassurethatthe
installaonwillbefunconalandsafe.Useonlyexperiencedand
knowledgeabletechnicianstoinstallthisdevice.
Thank you for choosing an HK Instruments CDT-MOD-2000 series
carbon dioxide transmier. The CDT-MOD-2000 series is intended
for use in commercial environments in HVAC/R applicaons. The
CDT-MOD-2000 series measures carbon dioxide (CO2), ulizing the
industrystandardNDIRmeasurementprinciple,andtemperature(T).
Oponal relave humidity (rH) measurement is also available in the
same device. The CDT-MOD-2000 series devices are available with
largetouchscreendisplaymakingtheconguraonofthedevicequick
andeasy.ConguraonisalsopossibleviaModbusnetwork.
The CDT-MOD-2000 series transmiers calibrate themselves auto-
macallyusingABCTMlogic.TheABCTMlogicrequiresthatthespacein
whichthetransmierisusedneedstotobeunoccupiedforfourhours
per day so that the indoor CO2 concentraon drops to the outside
level.CDT-MOD-2000-DCisadualchannelmodelwithameasuring
channelandareferencechannelthatmakesaconnuouscomparison
and the necessary adjustment accordingly. CDT-MOD-2000-DC is
alsosuitableforbuildingsthatareconnuouslyoccupied.
•humidityinvariousindustrialapplicaons
•temperaturesinHVAC/Renvironment
•CDT-MOD-2000-DCseriesdevicescanalsobeusedinapplicaons
wherethereisaconstantsourceofcarbondioxidepresent(for
examplehospitalsandgreenhouses)
SPECIFICATIONS
Performance
Measurement ranges:
CO2:400–2000ppm
Temperature:0...50°C
Relavehumidity:0–100%
Accuracy:
CO2:±40ppm+3%ofreading,DCmodel:75ppmor10%
ofreading(whicheverisgreater)
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:
ppm,°Cand%rH
Measuring element:
CO2:Non-dispersiveinfrared(NDIR)
Temperature: Pt1000(modelswithoutrH-measurement)
Integrated(modelswithrH-measurement)
Relavehumidity:Thermosetpolymercapacivesensing
element
Calibraon:
Automacself-calibraonABCLogicTMorconnuous
comparison(DC)
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 (Oponal)
Touchscreen
Size:77.4x52.4mm
Electrical connecons:
Powersupply:
5-screwterminalblock
(24V,GND)
0.2–1.5mm2(16–24AWG)
Relay out:
3-screwterminalblock
(NC,COM,NO)
0.2–1.5mm2(16–24AWG)
Electrical
Input: 24VACorVDC,±10%
Currentconsumpon:max90mA(at24V)+
10mAforeachvoltageoutputor20mAfor
eachcurrentoutput
Relay out:
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
Meetsrequirementsfor:
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-2000seriesdevicesarecommonlyusedtomonitor:
• CO2andhumiditylevelsinoces,publicspaces,meengrooms
andclassrooms
• CO2levelsofreturnairinvenlaonsystems
•incomingairandreturnairhumiditylevelsinvenlaonsystem
RoHS
COMPLIANT
Copyright HK Instruments 2022 www.hkinstruments. Installaon version 8.0 2022
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.TheCDT-MOD
shouldbemountedonaatsurface.
DonotlocatetheCDT-MODwhereitcanbeaectedby:
•Directsunlight
•Drasordeadareasbehinddoors
•Radiantheatfromappliances
•Concealedpipesorchimneys
•Outsidewallsorunheated/uncooledareas
2)Usethedeviceasatemplateandmarkthescrewholes.
3)Mountthewallplatewithscrews.
•Incorrectinstallaonmaycauseashiintemperatureoutput
•Securethelidwithalockingscrew,iftherelayisconnectedtothe
mainspower
Display locking
jumper
Output mode
selecon
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 2022 www.hkinstruments. Installaon version 8.0 2022
CAUTION!
•ForCEcompliance,aproperlygroundedshieldingcableis
required.
•Usecopperwireonly.Insulateorwirenutallunusedleads.
•Supplyaseparatecableforrelayandsignaloutwhenusingline
voltagetopowertherelay.
•Anywiringmaycarrythefulloperanglinevoltagecurrentbased
oneldinstallaon.Thecoverlockingscrewmustbeinstalledif
thelinevoltageissuppliedtotherelay.
•Careshouldbeusedtoavoidelectrostacdischargetothe
device.
•Thisunithasconguraonjumpers.Youmayneedtorecongure
thisdeviceforyourapplicaon.
1)Routethecablesthroughthesquareopeninginthebackplateor
forsurfacewiringselectaknockoutonthetoporboomofthe
wallplate,asshowninFigure2a.
2)ConnectthewiresasshowninFigure2band2c.
STEP 3: CONFIGURATION
WIRING DIAGRAMS CONTINUED
ConguraonoftheCDT-MOD-2000seriesdeviceconsistsof:
1)Conguringthejumpers(seestep4)
2)Conguraonmenuopons.(Displayversionsonly.Seethe
usermanualforfurtherdetails)
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
Figure 2d - Wiring diagram: Relay
NC
COM
NO
STEP 2: WIRING DIAGRAMS
NOTE!Whenusinglongconneconwiresitmaybenecessarytouseaseparate
GNDwire forvoltage output currentto preventmeasurement distoron. The
needforanextraGNDwiredependsonthecrossseconandlengthoftheused
conneconwires.Iflongand/orsmallcrossseconwiresareused,supplycur-
rentandwireresistancemaygenerateavoltagedropinthecommonGNDwire
resulnginadistortedoutputmeasurement.WhenusingACpowersupply,make
surethatthegroundpotenalofthesignalisthesameasthegroundpotenalof
thesupplyvoltagetoavoidshortcircuitthroughtheaddionalGNDwire.
Itisrecommendedtouseshieldedtwistedpaircableformodbuscabling.
Thecableshieldmustbeearthedonlyinonepoint,normally,attheendof
themaincable.
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 installaon
1)Conguraonoftheoutputmodes:
Selecttheoutputmode,current(4–20mA)orvoltage(0–10V),
byinstallingjumpersasshowninFigure4.
Toselect2–10Voutputmodeonadisplayversionofthedevice:
First,select0–10Voutputbyjumper,thenchangethevoltage(V)
outputfrom0–10Vto2–10Vviatheconguraonmenu.Please
seetheusermanualformoredetails.
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).
Copyright HK Instruments 2022 www.hkinstruments. Installaon version 8.0 2022
The seller is obligated to provide a warranty of ve years for the delivered
goods regarding material andmanufacturing. The warranty period is consid-
eredtostartonthedeliverydateoftheproduct.Ifadefectinrawmaterials
oraproduconawisfound,thesellerisobligated,whentheproductissent
tothesellerwithoutdelayorbeforeexpiraonofthewarranty,toamendthe
mistake athis/her discreon either byrepairing thedefecve product or by
deliveringfreeofchargetothebuyeranewawlessproductandsendingitto
thebuyer.Deliverycostsfortherepairunderwarrantywillbepaidbythebuyer
andthereturncostsbytheseller.Thewarrantydoesnotcomprisedamages
causedbyaccident,lightning,oodorothernaturalphenomenon,normalwear
andtear,improperorcarelesshandling,abnormaluse,overloading,improper
storage,incorrectcareorreconstrucon,orchangesandinstallaonworknot
donebytheseller.Theseleconofmaterialsfordevicespronetocorrosionis
thebuyer’sresponsibility,unlessotherwiseislegallyagreedupon.Shouldthe
manufactureralterthestructureofthedevice,thesellerisnotobligatedto
makecomparablechangestodevicesalreadypurchased.Appealingforwar-
rantyrequiresthatthebuyerhascorrectlyfullledhis/herduesarisenfrom
thedeliveryandstatedinthecontract.Thesellerwillgiveanewwarrantyfor
goodsthathavebeenreplacedorrepairedwithinthewarranty,howeveronly
totheexpiraonoftheoriginalproduct’swarrantyme.Thewarrantyincludes
therepairofadefecvepartordevice,orifneeded,anewpartordevice,but
notinstallaonorexchangecosts.Undernocircumstanceisthesellerliablefor
damagescompensaonforindirectdamage.
Register Parameter descripon Data Typ e Value Range
4x0001 ParameterforP-controller 16bit 0...3 0=CO2,1=rH,2=TE,3=MAX
4x0002 CO2hIghlimit 16bit 500...2000 500...2000ppm
4x0003 CO2lowlimit 16bit 0...1900 0...1900ppm
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 0=CO2,1=rH,2=TE,(3=O)
4x0009 CO2relayon 16bit 500...1950 500...1950ppm
4x0010 CO2relayo 16bit 450...1900 450...1900ppm
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
4x0015 CO2Oset 16bit -200…200 -200…200ppm
4x0016 RHOset 16bit -100…100 -10.0…10.0%rH
4x0017 TEOset 16bit -50…50 -5.0…5.0°C
Funconcode03-Readinputholdingregister
Funconcode04-Readinputregister
Register Parameter descripon Data Typ e Value Range
3x0001 ParameterforP-controller 16bit 0...3 0=CO2,1=rH,2=TE,3=MAX
3x0002 CO2reading 16bit 0...2000 0...2000ppm
3x0003 rHreading 16bit 0...1000 0,0...100.0%
3x0004 Temp.reading 16bit 0...500 0.0...50.0°C
3x0005 CO2highlimit 16bit 500...2000 500...2000ppm
3x0006 CO2lowlimit 16bit 0...1900 0...1900ppm
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 0=CO2,1=rH,2=TE,(3=O)
3x0012 CO2relayon 16bit 500...1950 500...1950ppm
3x0013 CO2relayo 16bit 450...1900 450...1900ppm
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
3x0018 CO2Oset 16bit -200…200 -200…200ppm
3x0 019 RHOset 16bit -100…100 -10.0…10.0%rH
3x0020 TEOset 16bit -50…50 -5.0…5.0°C
3x0021 Programversion 16bit 10…9999 1.0…999.9
MODBUS REGISTERS CONTINUED
Funconcode16-Writemulpleregisters
Register Parameter descripon Data Typ e Value Range
4x0001 ParameterforP-controller 16bit 0...3 0=CO2,1=rH,2=TE,3=MAX
4x0002 CO2hIghlimit 16bit 500...2000 500...2000ppm
4x0003 CO2lowlimit 16bit 0...1900 0...1900ppm
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 0=CO2,1=rH,2=TE,(3=O)
4x0009 CO2relayon 16bit 500...1950 500...1950ppm
4x0010 CO2relayo 16bit 450...1900 450...1900ppm
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
4x0015 CO2Oset 16bit -200…200 -200…200ppm
4x0016 RHOset 16bit -100…100 -10.0…10.0%rH
4x0017 TEOset 16bit -50…50 -5.0…5.0°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
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
1x0003 Timer status Bit0 0...1 0=O-1=On
Funconcode02-Readinputstatus
Funconcode06-Writesingleregister
Register Parameter descripon Data Typ e Value Range
4x0001 ParameterforP-controller 16bit 0...3 0=CO2,1=rH,2=TE,3=MAX
4x0002 CO2hIghlimit 16bit 500...2000 500...2000ppm
4x0003 CO2lowlimit 16bit 0...1900 0...1900ppm
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 0=CO2,1=rH,2=TE,(3=O)
4x0009 CO2relayon 16bit 500...1950 500...1950ppm
4x0010 CO2relayo 16bit 450...1900 450...1900ppm
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
4x0015 CO2Oset 16bit -200…200 -200…200ppm
4x0016 RHOset 16bit -100…100 -10.0…10.0%rH
4x0017 TEOset 16bit -50…50 -5.0…5.0°C
STEP 5: MODBUS REGISTERS
FunconsforModbuscommunicaon:
Funcon Code Descripon
01 Readcoilstatus
02 Readinputstatus
03 Readholdingregisters
04 Readinputregisters
05 Forcesinglecoil
06 Presetsingleregister
07 Readexceponstatus
15 Forcemulplecoils
16 Presetmulpleregisters
17 ReportslaveID
Funconcode05-Writesinglecoil
Register Parameter descripon Data Typ e Value Range
0x0001 Relaytrend Bit0 0...1 0=Increasing,1=Decreasing
-
1
-
2
-
3
-
4
HK Instruments CDT-MOD-2000 CARBON DIOXIDE TRANSMITTERS Operating instructions
- Type
- Operating instructions
HK Instruments CDT-MOD-2000 CARBON DIOXIDE TRANSMITTERS are versatile devices designed to accurately measure carbon dioxide (CO2) levels, temperature, and relative humidity in various commercial and industrial environments. With their advanced NDIR measurement principle and automatic ABC LogicTM calibration, these transmitters ensure precise and reliable readings. The optional dual-channel model (CDT-MOD-2000-DC) allows continuous comparison and adjustment, making it suitable for areas with constant CO2 sources.
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