HK Instruments Siro is a versatile indoor air quality transmitter designed for use in building automation systems. Equipped with advanced sensors, it accurately measures CO2 concentration, VOCs (Volatile Organic Compounds), PM (Particulate Matter), temperature, and humidity. Siro's modular design allows for customization with various output signals and user-friendly configuration options. Its compact size and easy installation make it ideal for monitoring air quality in offices, public spaces, classrooms, and HVAC/R environments.
HK Instruments Siro is a versatile indoor air quality transmitter designed for use in building automation systems. Equipped with advanced sensors, it accurately measures CO2 concentration, VOCs (Volatile Organic Compounds), PM (Particulate Matter), temperature, and humidity. Siro's modular design allows for customization with various output signals and user-friendly configuration options. Its compact size and easy installation make it ideal for monitoring air quality in offices, public spaces, classrooms, and HVAC/R environments.
Copyright HK Instruments 2022 www.hkinstruments. Installaon version 2.0 2022
INSTALLATION
INSTRUCTIONS
Indoor air quality transmitters
Siro series
• READ THESE INSTRUCTIONS CAREFULLY BEFORE
ATTEMPTING TO INSTALL, OPERATE OR SERVICE THIS DEVICE.
• Failuretoobservesafetyinformaonandcomplywithinstrucons
canresultinPERSONALINJURY,DEATHAND/ORPROPERTY
DAMAGE.
• Toavoidelectricalshockordamagetoequipment,disconnect
powerbeforeinstallingorservicinganduseonlywiringwith
insulaonratedforfulldeviceoperangvoltage.
• Toavoidpotenalreand/orexplosiondonotuseinpotenally
ammableorexplosiveatmospheres.
• Retaintheseinstruconsforfuturereference.
• Thisproduct,wheninstalled,willbepartofanengineeredsystem
whosespecicaonsandperformancecharacteriscsarenot
designedorcontrolledbyHKInstruments.Reviewapplicaons
andnaonalandlocalcodestoassurethattheinstallaonwill
befunconalandsafe.Useonlyexperiencedandknowledgeable
technicianstoinstallthisdevice.
Thank you for choosing an HK Instruments Siro series indoor air
qualitytransmier.TheSiroseriestransmiersareintendedforuse
inbuildingautomaonsystemsintheHVAC/Rindustry.
Sirois anindoor air qualitytransmierwitha moderndesign.The
transmierisavailablewithseveraloponalairqualitysensors.The
modulardevicecanbeequippedwithCO2concentraonandVOC
(Volale Organic Compounds) measurements or alternavely PM
(ParculateMaer)measurementandinaddion temperatureand
humiditymeasurements.Itoerseasyinstallaonandadjustment,
severaldierentmodeloponsandvariousoutputsignalsthatare
congurableseparatelyforeachmeasurementparameter.
TheSiroseriesdevicesareavailablewithuserinterfacethatincludes
LCDdisplayandbuonsmakingtheconguraonofthedevicequick
andeasy.Anexternalconguraontoolisavailablefordeviceswith-
outuserinterface.SiroulizestheindustrystandardNDIRmeasure-
mentprinciplewithself-calibrangABClogicTM for CO2 measurement.
•PMconcentraontomeasuresthesizeandamountofparculates
intheindoorairforexampletoassesstheperformanceofairlters
•temperatureandhumidityinHVAC/Renvironment
SPECIFICATIONS
Performance
Measurement ranges:
CO2: 0–2000ppm/400–2000ppm
(selectableviajumper)
VOC: CO₂eq:400–2000ppm
TVOCppm:0–30.0ppm
TVOCµg/m3:0–10000µg/m3
IAQindex:1–5(UBArang)
PM1/PM2.5/PM10: 0–50μg/m³/0–500μg/m³
(selectableviajumper)
IAQindex:1-5(WHOrang)
Temperature: 0...50°C
Relavehumidity: 0–100%rH
Accuracy:
CO2: ±43ppm+3%ofreading(typical),
addional±60ppmforrstweeks
VOC*: 15%ofreading(typical)
*VOCsensoristunedfortypicalIAQMixof22VOCsas
denedbyMølhaveetal.(1997)
PM:
0…100µg/m3:
PM2.5: ±15µg/m³(at25⁰C±5⁰C)
PM1/PM10*: ±25µg/m³(at25⁰C±5⁰C)
100…1000µg/m3:
PM2.5: ±15%(at25⁰C±5⁰C)
PM1/PM10*: ±25%(at25⁰C±5⁰C)
*PM1andPM10valuesarecalculatedfromPM2.5
measurementreadingwiththedefaultparcledistribuon.
Temperature: ±0.5⁰C(typicalat20⁰C)
Relavehumidity: ±2.4%rH(typicalat20ºC,30%rH)
Technical Specicaons
Media compability:
Dryairornon-aggressivegases
Measuring units:
CO₂: ppm
VOC: CO2eq:ppm
TVOC:ppm,µg/m³
PM: PM1/PM2.5/PM10:µg/m³
Temperature: °C/°F
Relavehumidity: %rH
Measuring element:
CO2:
Non-dispersiveinfrared(NDIR)
VOC:
ComplementaryMetalOxideSemiconductor
(CMOS)
PM:
Laser-basedlightscaeringparclesensing
Temperature:
IntegratedtoCMOS
Relave humidity:
Thermosetpolymercapacivesensingelement
Calibraon:
Automacself-calibraonABCLogicTM for CO2
measurement
Environment:
Operangtemperature:0...50°C
Storagetemperature:-20...70°C
Humidity:0to95%rH,noncondensing
Physical
Dimensions:
Case:95x103x30mm
(widthxheightxdepth)
Weight:
130g
Mounng:
2screwholessloed,distancec/c60mm
Materials:
Case: ABS
Protecon standard:
IP20
Display (oponal)
MonochromeLCD,38x23mm
Electrical connecons:
8-pinspringloadedterminalblock
0.2...1.5mm²(16-24AWG)
Electrical
Input:
24VACorVDC,±10%
Powerconsumpon:2Wmax+25mWforeach
voltageoutputor50mWforeachcurrentoutput
Outputs:
4outputs,havetoselectvoltageorcurrent
Voltageoutputs:
0 –10 V
2–10V/0–5V(oponal,displayor
conguraontoolrequired)
Currentoutput:
4–20mA(oponal)
Outputsignallimits:
Voltageoutputs:R>1kΩ
Currentoutput:R>20Ω,R<500Ω
Conformance
Meetsrequirementsfor:
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
APPLICATIONS
WARNING
Siroseriesdevicesarecommonlyusedtomonitorandcontrol:
•indoorairqualityinoces,publicspaces,meengroomsand
classrooms
• CO2andVOCconcentraontoregulatedemand-controlled
venlaonandtokeeptheindoorairqualityinagoodlevel
RoHS
COMPLIANT
Copyright HK Instruments 2022 www.hkinstruments. Installaon version 2.0 2022
Pin header Descripon
OUT1
OUT2
OUT3
OUT4
GND
Voltage / current output selecon
•Currentoutputisanoponal
Output1
Output2
Output3
Output4
Ground
SCHEMATICS DIMENSIONAL DRAWINGS
INSTALLATION
1)Mountthedeviceinthedesiredlocaon(seestep1).
2)Routethecablesandconnectthewires(seestep2).
3)ConnectthedisplaycabletothedisplayconnectoronthePCB.(See
schemacs)
4)Thedeviceisnowreadyforconguraon.
WARNING!Applypoweronlyaerthedeviceisproperlywired.
PM SENSOR
CO₂ SENSOR
VOC SENSOR
A+
B–
24V
GND
GND
OUT1
OUT2
OUT3
OUT4
GND
OUT1
OUT2
OUT3
OUT4
DISPLAY CONNECTOR
21
5
4
TEMP OR
rH + TEMP
SENSOR
3
mA-MODULE
Pin header Descripon
Open
Connected
Open
Connected
CO2 / PM output range selecon
400...2000ppm(CO2models)
0...2000ppm(CO2models)
0...500μg/m3(PMmodels)
0...50μg/m3(PMmodels)
Pin header Descripon
Open
Connected
Menu lock
Menulockdisabled
Menulockenabled
1
2
Connector Descripon
A+
B-
RS485 Modbus/RTU slave (oponal)
DATA+
DATA-
24 V
GND
GND
Power supply
24VAC/DC±10%
Ground
Ground
3
Connector Descripon
OUT1
OUT2
OUT3
OUT4
GND
Voltage / current outputs
•Outputsengscanbemodiedfromthedisplay
menu
•Seethelidlabelforfactorydefaultsengs.
Output1
Output2
Output3
Output4
Ground
4
5
V
mA
Opening/closing the lid
1)Openthelidbypressingthecenterfromtheboomofthelidasin
thegure.
2)Closethelidbyinserngthetopofthelidintothegroovesrstand
pushingtheboomedgeasinthegure.
Copyright HK Instruments 2022 www.hkinstruments. Installaon version 2.0 2022
Figure 2a - Roung the cables
Figure 2b - Wiring diagram: Power input & signal output
Figure 1a - Surface mounng
Figure 1b - Mounng orientaon
YES NO NO
1)Routethecablesthroughtheopeninginthebackplateorfor
surfacewiringselectaknockoutontheboomofthewallplate,
asshowninFigure2a.
2)ConnectthewiresasshowninFigure2band2c.
CAUTION!
•ForCEcompliance,aproperlygroundedshieldingcableis
required.
•Usecopperwireonly.Insulateorwirenutallunusedleads.
•Careshouldbeusedtoavoidelectrostacdischargetothedevice.
•Thisunithasconguraonjumpers.Youmayneedtorecongure
thisdeviceforyourapplicaon.
STEP 2: WIRING DIAGRAMSSTEP 1: MOUNTING THE DEVICE
1)Selectamounnglocaononthewallat1.2–1.8m(4–6)above
theoorandatleast50cm(20in)fromtheadjacentwall.Do
notblockdeviceairventsfromanydireconandleaveatleast
20cm(8in)gaptootherdevices.Locatetheunitinanareawith
goodvenlaonandanaveragetemperature,whereitwillbe
responsivetochangestotheroomcondions.TheSiroshouldbe
mountedonaatsurface.
DonotlocatetheSirowhereitcanbeaectedby:
•Directsunlight
•Drasordeadareasbehinddoors
•Radiantheatfromappliances
•Concealedpipesorchimneys
•Outsidewallsorunheated/uncooledareas
2)Usethedeviceasatemplateandmarkthescrewholes.
3)Mountthewallplatewithscrews.
CAUTION!Incorrectinstallaonmaycauseashiinmeasurements.
Figure 1c - Mounng locaon
120 cm (4 ft)
180 cm (6 ft)
≥
50 cm (20 in)
≥ 20 cm (8 in)
≥ 20 cm (8 in)
NOTE!Whenusinglongconneconwiresitmaybenecessarytousea
separateGNDwireforvoltageoutputcurrenttopreventmeasurement
distoron.TheneedforanextraGNDwiredependsonthecrosssec-
onandlengthoftheusedconneconwires.Iflongand/orsmallcross
seconwiresareused,supplycurrentandwireresistancemaygener-
ateavoltage drop in thecommon GNDwire resulng in adistorted
outputmeasurement.
WhenusingACpowersupply,makesurethatthegroundpotenalof
thesignalisthesameasthegroundpotenalofthesupplyvoltageto
avoidshortcircuitthroughtheaddionalGNDwire.
OUT1
OUT2
OUT3
OUT4
GND
A+
B–
24V
GND
GND
0-10V/2-10V/0-5V/4-20mA
0-10V/2-10V/0-5V/4-20mA
0-10V/2-10V/0-5V/4-20mA
0-10V/2-10V/0-5V/4-20mA
+
Copyright HK Instruments 2022 www.hkinstruments. Installaon version 2.0 2022
1)Conguraonoftheoutputmodes:
Selecttheoutputmode,current(4–20mA)(oponal)orvoltage(0–
10V) foreachoutput(1-4)byinstallingjumpersasshowninFigure4.
Onadisplayversionofthedevice,theoutputscalecanbechanged
viatheconguraonmenu.Anexternalconguraontoolisavail-
ablefordeviceswithoutuserinterface.
First,selecttheoutputmodebyjumper,thenselecttheoutputscale
(4–20mA(oponal)/0–10V/2–10V/0–5V)viatheconguraon
menu.Pleaseseetheusermanualformoredetails.
Thesellerisobligatedtoprovideawarrantyofveyearsforthedeliv-
eredgoodsregardingmaterialandmanufacturing.Thewarrantyperiod
isconsideredtostartonthedeliverydateoftheproduct.Ifadefect
inrawmaterialsoraproduconawisfound,thesellerisobligated,
whentheproductissenttothesellerwithoutdelayorbeforeexpira-
onofthewarranty,toamendthemistakeathis/herdiscreoneither
byrepairing the defecve product or by delivering free ofcharge to
thebuyeranewawlessproductandsendingittothebuyer.Delivery
costsfortherepairunderwarrantywillbepaidbythebuyerandthe
return costs by the seller. The warranty does not comprise damages
causedbyaccident,lightning,oodorothernaturalphenomenon,nor-
malwearandtear,improperorcarelesshandling,abnormaluse,over-
loading,improperstorage,incorrectcareorreconstrucon,orchanges
andinstallaonworknotdonebytheseller.Theseleconofmateri-
alsfordevicespronetocorrosionisthebuyer’sresponsibility,unless
otherwise is legally agreed upon. Should the manufacturer alter the
structureofthedevice,thesellerisnotobligatedtomakecomparable
changestodevicesalreadypurchased.Appealingforwarrantyrequires
thatthebuyerhascorrectlyfullledhis/herduesarisenfromthede-
liveryandstatedinthecontract.Thesellerwillgiveanewwarrantyfor
goodsthathavebeenreplacedorrepairedwithinthewarranty,how-
everonlytotheexpiraonoftheoriginalproduct’swarrantyme.The
warrantyincludestherepairofadefecvepartordevice,orifneeded,
anewpartordevice,butnotinstallaonorexchangecosts.Underno
circumstanceisthesellerliablefordamagescompensaonforindirect
damage.
Figure 4
STEP 4: Jumper settings
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
Figure 3 - Jumper installaon
A+
B–
24V
GND
GND
OUT1
OUT2
OUT3
OUT4
GND
OUT1
OUT2
OUT3
OUT4
3
1 2
OUT1
OUT2
OUT3
OUT4
V
mA
2)OutputrangeseleconwithCO2-andPM-models:
Installthejumper1(gure3)tochangeoutputrange.Thisfeature
isintendedtouseonlyondeviceswithoutdisplay.Onadisplay
versionofthedevice,theoutputrangecanbeselectedviathe
conguraonmenu.Pleaseseetheusermanualformoredetails.
Pin header Descripon
Open
Connected
Open
Connected
CO2 / PM output range selecon
400...2000ppm(CO2models)
0...2000ppm(CO2models)
0...500μg/m3(PMmodels)
0...50μg/m3(PMmodels)
1
3)Lockingthedisplay:
Installthejumper2(gure3)tolockthedisplaytopreventaccessto
theconguraonmenuaerinstallaoniscompleted.
Jumper settings continued
STEP 3: CONFIGURATION
ConguraonoftheSiroseriesdeviceconsistsof:
1)Conguringthejumpers(seestep4).
2)Conguraonmenuopons.
(Display(-D)orconguraontoolrequired.Seetheusermanual
forfurtherdetails.)
Figure 2c - Wiring diagram: Extra GND wire
WIRING DIAGRAMS CONTINUED
NOTE! When using mA output, do not use Vout scalings from the
menu.
Using2-10Voutputinsomeapplicaonsitiscricaltoknow
immidiatelyifthewireisbrokenorthedeviceisdamaged.Inthese
cases,a2-10voltageoutputisrecommended.
OUT1
OUT2
OUT3
OUT4
GND
A+
B–
24V
GND
GND
V
V
V
V
0-10V/2-10V/0-5V/4-20mA
0-10V/2-10V/0-5V/4-20mA
0-10V/2-10V/0-5V/4-20mA
0-10V/2-10V/0-5V/4-20mA
+
-
1
-
2
-
3
-
4
HK Instruments Siro is a versatile indoor air quality transmitter designed for use in building automation systems. Equipped with advanced sensors, it accurately measures CO2 concentration, VOCs (Volatile Organic Compounds), PM (Particulate Matter), temperature, and humidity. Siro's modular design allows for customization with various output signals and user-friendly configuration options. Its compact size and easy installation make it ideal for monitoring air quality in offices, public spaces, classrooms, and HVAC/R environments.
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