HK Instruments DPT-Dual-MOD-AHU User manual
- Type
- User manual
HK Instruments DPT-Dual-MOD-AHU is a differential pressure transmitter designed for air handling units, combining two differential pressure transmitters into one device. It enables measuring pressure from two different points, with possibilities for flow rate measurement and Modbus interface for communication. The DPT-Dual-MOD-AHU finds applications in HVAC/R systems for air flow monitoring, fan and filter monitoring, pressure monitoring in cleanrooms, and more.
HK Instruments DPT-Dual-MOD-AHU is a differential pressure transmitter designed for air handling units, combining two differential pressure transmitters into one device. It enables measuring pressure from two different points, with possibilities for flow rate measurement and Modbus interface for communication. The DPT-Dual-MOD-AHU finds applications in HVAC/R systems for air flow monitoring, fan and filter monitoring, pressure monitoring in cleanrooms, and more.
Copyright HK Instruments 2023 www.hkinstruments. Installaon version 1.0 2023
INSTALLATION
INSTRUCTIONS
DIFFERENTIAL PRESSURE TRANSMITTERS
DPT-Dual-MOD-AHU
• 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 youfor choosing an HK Instruments DPT-Dual-MOD-AHU
seriesdierenalpressuretransmier.DPT-Dual-MOD-AHUises-
peciallydesignedforairhandlingunits,combiningtwodierenal
pressuretransmiersintoonedevice.Itoersapossibilitytomeas-
urepressurefromtwodierentpoints.Oneofthemeasurements
can be set to show the air ow rate. DPT-Dual-MOD-AHU has a
ModbusinterfaceandanInputterminal.
TheInputterminalenablesreadingofmulpleothersignalssuchas
temperatureorcontrolrelaysoverModbus.TheInputterminalhas
two input channels designed to accept 0−10 V, NTC10k, Pt1000,
Ni1000/(-LG),andBININ(potenalfreecontact)signals.
DPT-Dual-MOD-AHUseriesdevicesarecommonlyusedinHVAC/R
systems for:
•airowmonitoringacrosscentrifugalfansandblowers
•in-ductairowmonitoring
•VAVapplicaons
•fan,blowerandltermonitoring
•pressureandowmonitoring
•valveanddampercontrol
•pressuremonitoringincleanrooms
SPECIFICATIONS
Performance
Accuracy (from applied pressure):
SensorA(-700...7000Pa):
Pressure<125Pa=1.5%+±2Pa
Pressure>125Pa=1.5%+±1Pa
SensorB(-250...2500Pa):
Pressure<125Pa=1%+±2Pa
Pressure>125Pa=1%+±1Pa
(Including:generalaccuracy,linearity,hysteresis,long
termstabilityandrepeonerror)
Input accuracy:
<0.5%
Response me:
1...20sselectableviamenu
Overpressure:
Proofpressure:25kPa
Burstpressure:30kPa
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
Zeropointcalibraonopons:
•Manualpushbuon
•ViaModbuswritecoil
Technical Specicaons
Media compability:
Dryairornon-aggressivegases
Measuring units on display (Selectable via menu):
Pressure:Pa,kPa,mbar,inchWC,mmWC,psi
Flow:m3/s,m3/hr,cfm,l/s,m/s,/min
Measuring element:
MEMS,noow-through
Environment:
Operangtemperature:-20...50°C
Temperaturecompensatedrange0...50°C
Storagetemperature:-40...70°C
Humidity:0to95%rH,non-condensing
Physical
Dimensions:
Case:102.0x71.5x36.0mm
Weight:
150g
Mounng:
2each4.3mmscrewholes,onesloed
Materials:
Case: ABS
Lid:PC
Pressure inlets: Brass
Tubing:Silicone
Protecon standard:
IP54
Display:
2-linedisplay(12characters/line)
Line1:acvemeasurement,inletA
Line2:acvemeasurement,inletB
Ifinputsareselected,thelinesshowalsoinput
informaon(forexampletemperature)
Electrical Connecons:
4+4springloadterminals,max1.5mm2
CableEntry:M20
Pressure ngs:
Male 5.2mm
+Highpressure
-Lowpressure
Electrical
Supply voltage:
24VACorVDC±10%
Power consumpon:
<1.3W
Output signal:
viaModbus
Input signals:
2xinput(0...10V,NTC10k,Pt1000,NI1000/(-LG),or
BININ)
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 WARNING
APPLICATIONS
RoHS
COMPLIANT
Copyright HK Instruments 2023 www.hkinstruments. Installaon version 1.0 2023
SCHEMATICS
DIMENSIONAL DRAWINGS
Figure 1a - Mounng orientaon
Figure 1b - Applicaon connecons
Display connecon
A
B
24 V
GND
LEDs
Joysck 1
Joysck 2
Joysck 3
Select
Up
Down
Menu buons
Terminal
blocks
Pressure
sensors
Input terminal
configuraon
jumpers
Input 1
Input 2
GND
GND
InputOutput
Pressure
inlet A
for dP or flow
Pressure
inlet B
for dP
A
B
YES NO NO
Stac pressure Filter/Damper
monitoring
Fan/Blower
monitoring
Not
connected
INSTALLATION
1)Mountthedeviceinthedesiredlocaon(seestep1).
2)Openthelidandroutethecablethroughthestrainreliefand
connectthewirestotheterminalblock(s)(seestep2).
3)Thedeviceisnowreadyforconguraon.
WARNING!Applypoweronlyaerthedeviceisproperlywired.
Pressure
Flow
Thepressuretubesareconnectedtoaowmeasurementprobe(i.e.FloXact),ortothe
measurementportsspeciedbythefanmanufacturer.PleaseseetheFloXactinstal-
laonguideorthefanmanufacturer’stechnicalspecicaonsformoreinformaon.
STEP 1: MOUNTING THE DEVICE
1)Selectthemounnglocaon(duct,wall,panel).
2)Usethedeviceasatemplateandmarkthescrewholes.
3)Mountwithappropriatescrews.
MOUNTING THE DEVICE CONTINUED
STEP 2: WIRING DIAGRAMS
ForCEcompliance,aproperlygroundedshieldingcableisrequired.
1)Unscrewthestrainreliefandroutethecable(s).
2)Connectthewiresasshowningure2aand2b.
3)Tightenthestrainrelief.
Figure 2a - Wiring diagram
Figure 2b - Wiring diagram example for input signals
Input 1
Input 2
GND
GND
Pt1000
NTC10k
J1
J2
J3
IN1 IN2
Input 1 Pt1000 temperature:
Funcon 04 - Read input register 3x0005
Input 2 NTC10k temperature:
Funcon 04 - Read input register 3x0013
A
B
24 V
GND
+ Power Supply
24VDC / 24VAC
Input 1
Input 2
GND
GND
Modbus
Air handling unit
InatypicalAirHandlingUnitapplicaon,connectthepressureinletAtomeasure
airowandpressureinletBtomeasurethedierenalpressureacrossthelter.
PressureinletAcanbeusedforpressureorowmeasurement.
PressureinletBcanbeusedonlyforpressuremeasurement.
Copyright HK Instruments 2023 www.hkinstruments. Installaon version 1.0 2023
NOTE! Always zero the device before use.
Supplyvoltagemustbeconnectedonehourbeforethezeropoint
adjustmentiscarriedout.AccessviaModbusorbypushbuon.
1)Loosebothtubesfromthepressureinlets+and-.
2)Presstheselectbuonfor1secto
enterthemenuandselectzero sensors.
3)WaitunltheLEDturnsoandtheninstalltubesagainforthe
pressureinlets.
CONFIGURATION CONTINUED
STEP 3: CONFIGURATION
7)SelecttheaddressforModbus:1*...247.
BAUD RATE
9600
SELECT
UP
DOWN
ADDRESS
99
SELECT
UP
DOWN
PARITY BIT
NONE
SELECT
UP
DOWN
8)Selectthebaudrate:9600*/19200/38400.
9)Selecttheparitybit:None*/Even/Odd.
10)Selecttheresponseme:1...20s(factorysetup4s)
RESPONSETIME
20 s
SELECT
UP
DOWN
13)Pushtheselectbuontosavesengsandexitmenu.
SELECT
EXIT MENU SELECT
STEP 4: ZERO POINT ADJUSTMENT
SELECT
1)AcvatethedeviceMenubypushingthetheselectbuonfor1
second.
3)Ifcommon probeisselected,selectmeasurementunitusedinthe
formula:m3/s,m3/h,cfm,l/s,m/sorf/min.
Note:WhenusingtheFloXactprobe,selecttheformulaunitl/s.
Forotherprobemodels,checkthemanufacturer’sdatasheetfor
thecorrectunit.
FORMULA UNIT
l/s
SELECT
UP
DOWN
4)SelectK-value
EachapplicaonhasaspecicK-value.SelecttheK-valuefromthe
manufacturer’sspecicaons.
AvailableK-valuerange:0.001...9999.000
K-VALUE
9000.000
SELECT
UP
DOWN
5)Selectpressureunitfordisplay:
Pa,kPa,mbar,mmWC,inWCorpsi
PRESS.UNIT
Pa
SELECT
UP
DOWN
6)Selectowunitfordisplay:
Flowvolume:m3/s,m3/h,cfm,l/s
Velocity:m/s,f/min(selectableonlyifacommonprobeisusedwith
m/sorf/minunit)
FLOW UNIT
m3/s
SELECT
UP
DOWN
2)Selectthefunconingmodeofthedevice:
-SelectManufacturerwhenconnecngDPT-Dual-MOD-AHUtoa
fanwithpressuremeasurementpoints
-SelectCommon probe whenusingDPT-Dual-MOD-AHUwitha
commonmeasurementprobethatfollowstheformula:
q=k∙√∆P(i.e.FloXact)
11)Selectthethetypeofsensorforinput1:
NTC10k,Ni1000-LG,Ni1000,Pt1000,
VINPUT(voltage0–10V),none
SENSOR 1
NTC10K
SELECT
UP
DOWN
12)Selectthethetypeofsensorforinput2:
NTC10k,Ni1000-LG,Ni1000,Pt1000,
VINPUT(voltage0–10V),none
SENSOR 2
NONE
SELECT
UP
DOWN
MANUFACTURER
Common probe
SELECT
UP
DOWN
Common probe Flakt Woods
SELECT
UP
DOWN
*Factorysetup
Copyright HK Instruments 2023 www.hkinstruments. Installaon version 1.0 2023
Thesellerisobligatedtoprovideawarrantyofveyearsforthedeliv-
eredgoodsregardingmaterialandmanufacturing.Thewarrantyperiod
isconsideredtostartonthedeliverydateoftheproduct.Ifadefect
inrawmaterialsoraproduconawisfound,thesellerisobligated,
whentheproductissenttothesellerwithoutdelayorbeforeexpira-
onofthewarranty,toamendthemistakeathis/herdiscreoneither
byrepairing the defecveproduct orbydelivering freeofcharge to
thebuyeranewawlessproductandsendingittothebuyer.Delivery
costsfortherepairunderwarrantywillbepaidbythebuyerandthe
return costs by the seller.Thewarranty 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.
Register Parameter descripon Data Type Value Range
3x0001 Programversion 16bit 0...1000 0,00...99,00
3x0002 PressurereadingA 16bit -700...7000 -700...7000(Pa)
3x0003 PressurereadingB 16bit -250...2500 -250...2500(Pa)
3x0004 Input1:0...10V 16bit 0...1000 0...100%
3x0005 Input1:Pt1000 16bit -500...500 -50...+50°C
3x0006 Input1:Ni1000 16bit -500...500 -50...+50°C
3x0007 Input1:Ni1000-LG 16bit -500...500 -50...+50°C
3x0008 Input1:NTC10k 16bit -500...500 -50...+50°C
3x0009 Input2:0...10V 16bit 0...1000 0...100%
3x0010 Input2:Pt1000 16bit -500...500 -50...+50°C
3x0011 Input2:Ni1000 16bit -500...500 -50...+50°C
3x0012 Input2:Ni1000-LG 16bit -500...500 -50...+50°C
3x0013 Input2:NTC10k 16bit -500...500 -50...+50°C
3x0014 Flowm3/s 16bit 0...10000 0...100m3/s
3x0015 Flowm3/h 16bit 0...30000 0...30000m3/h
3x0016 Flowcfm 16bit 0...30000 0...30000cfm
3x0017 Flowl/s 16bit 0...3000 0...3000l/s
3x0018 Velocitym/s 16bit 0...1000 0...100m/s
3x0019 Velocityf/min 16bit 0...5000 0...5000f/min
Funconcode04-Readinputregister
The parts le over from installaon should be
recycled according to your local instrucons.
Decommissioned devices should be taken to a
recyclingsitethatspecializesinelectronicwaste.
STEP 6: MODBUS REGISTERS
RECYCLING/DISPOSAL
WARRANTY POLICY
Funconcode03-Readinputholdingregister
Register Parameter descripon Data Type Value Range
4x0001 Manufacturer 16bit 0...8
0=FläktWoods,1=Rosenberg,
2=Nicotra-Gebhardt,3=Comefri,
4=Ziehl,5=ebm-papst6=Gebhardt,
7=Nicotra,8=Commonprobe
4x0002
Formulaunit(Manufac-
turer=8)
16bit 0...5
0=m3/s,1=f/min,2=m/s,3=l/s,4=cfm,
5=m3/h
4x0003 K-FactorInteger 16bit 0...9999 0...9999
4x0004 K-FactorDecimal 16bit 0...999 0...999
4x0005 ResponseTime 16bit 0...20 0...20s
MODBUS REGISTERS CONTINUED
Funconcode02-Readinputstatus
Register Parameter descripon Data Type Value Range
1x0001 Input1:BININ Bit0 0...1 0=On,1=O
1x0002 Input2:BININ Bit0 0...1 0=On,1=O
Funcon05-Writesinglecoil
Register Parameter descripon Data Type Value Range
0x0001 Zeroingfuncon Bit0 0...1 0=On,1=O
Funconcode06-Writesingleregister
Register Parameter descripon Data Type Value Range
4x0001 Manufacturer 16bit 0...8
0=FläktWoods,1=Rosenberg,
2=Nicotra-Gebhardt,3=Comefri,
4=Ziehl,5=ebm-papst6=Gebhardt,
7=Nicotra,8=Commonprobe
4x0002
Formulaunit(Manufac-
turer=8)
16bit 0...5
0=m3/s,1=f/min,2=m/s,3=l/s,4=cfm,
5=m3/h
4x0003 K-FactorInteger 16bit 0...9999 0...9999
4x0004 K-FactorDecimal 16bit 0...999 0...999
4x0005 ResponseTime 16bit 0...20 0...20s
STEP 5: INPUT SIGNAL CONFIGURATION
InputsignalscanbereadoverModbusviaDPT-MODRS485interface.
Signals Accuracy for measurement Resoluon
0...10V <0,5% 0,1%
NTC10k <0,5% 0,1%
Pt1000 <0,5% 0,1%
Ni1000/(-LG) <0,5% 0,1%
BININ(potenalfreecontact)
Thejumpersshouldbesetaccordingtotheinstruconsbelowandthe
valueshouldbereadfromtherightregister.Bothinputscanbecong-
uredindependently.
Figure 3 - Input signal conguraon
J1
J2
J3
IN1 IN2
J1
J1
J1
J2
J2
J2
J3
J3
J3
NTC10k / BIN IN
Pt1000 / Ni1000/(-LG)
0...10 V
-
1
-
2
-
3
-
4
HK Instruments DPT-Dual-MOD-AHU User manual
- Type
- User manual
HK Instruments DPT-Dual-MOD-AHU is a differential pressure transmitter designed for air handling units, combining two differential pressure transmitters into one device. It enables measuring pressure from two different points, with possibilities for flow rate measurement and Modbus interface for communication. The DPT-Dual-MOD-AHU finds applications in HVAC/R systems for air flow monitoring, fan and filter monitoring, pressure monitoring in cleanrooms, and more.
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