HK Instruments DPT-Dual-MOD-AHU Installation guide

Type
Installation guide

HK Instruments DPT-Dual-MOD-AHU is a versatile differential pressure transmitter designed for air handling units. It features two differential pressure transmitters in one device, allowing for simultaneous measurements from two different points. With its Modbus interface and Input terminal, it can read multiple signals such as temperature or control relays. The DPT-Dual-MOD-AHU is commonly used for air flow monitoring, fan and blower monitoring, pressure monitoring in cleanrooms, and VAV applications.

HK Instruments DPT-Dual-MOD-AHU is a versatile differential pressure transmitter designed for air handling units. It features two differential pressure transmitters in one device, allowing for simultaneous measurements from two different points. With its Modbus interface and Input terminal, it can read multiple signals such as temperature or control relays. The DPT-Dual-MOD-AHU is commonly used for air flow monitoring, fan and blower monitoring, pressure monitoring in cleanrooms, and VAV applications.

Copyright HK Instruments 2023 www.hkinstruments. Installaon 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.
• Failuretoobservesafetyinformaonandcomplywith
instrucons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 DPT-Dual-MOD-AHU
seriesdierenalpressuretransmier.DPT-Dual-MOD-AHUises-
peciallydesignedforairhandlingunits,combiningtwodierenal
pressuretransmiersintoonedevice.Itoersapossibilitytomeas-
urepressurefromtwodierentpoints.Oneofthemeasurements
can be set to show the air ow rate. DPT-Dual-MOD-AHU has a
ModbusinterfaceandanInputterminal.
TheInputterminalenablesreadingofmulpleothersignalssuchas
temperatureorcontrolrelaysoverModbus.TheInputterminalhas
two input channels designed to accept 010 V, NTC10k, Pt1000,
Ni1000/(-LG),andBININ(potenalfreecontact)signals.
DPT-Dual-MOD-AHUseriesdevicesarecommonlyusedinHVAC/R
systems for:
•airowmonitoringacrosscentrifugalfansandblowers
•in-ductairowmonitoring
•VAVapplicaons
•fan,blowerandltermonitoring
•pressureandowmonitoring
•valveanddampercontrol
•pressuremonitoringincleanrooms
SPECIFICATIONS
Performance
Accuracy (from applied pressure):
SensorA(-700...7000Pa):
Pressure<125Pa=1.5%+±2Pa
Pressure>125Pa=1.5%+±1Pa
SensorB(-250...2500Pa):
Pressure<125Pa=1%+±2Pa
Pressure>125Pa=1%+±1Pa
(Including:generalaccuracy,linearity,hysteresis,long
termstabilityandrepeonerror)
Input accuracy:
<0.5%
Response me:
1...20sselectableviamenu
Overpressure:
Proofpressure:25kPa
Burstpressure:30kPa
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
Zeropointcalibraonopons:
•Manualpushbuon
•ViaModbuswritecoil
Technical Specicaons
Media compability:
Dryairornon-aggressivegases
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,noow-through
Environment:
Operangtemperature:-20...50°C
Temperaturecompensatedrange0...50°C
Storagetemperature:-40...70°C
Humidity:0to95%rH,non-condensing
Physical
Dimensions:
Case:102.0x71.5x36.0mm
Weight:
150g
Mounng:
2each4.3mmscrewholes,onesloed
Materials:
Case: ABS
Lid:PC
Pressure inlets: Brass
Tubing:Silicone
Protecon standard:
IP54
Display:
2-linedisplay(12characters/line)
Line1:acvemeasurement,inletA
Line2:acvemeasurement,inletB
Ifinputsareselected,thelinesshowalsoinput
informaon(forexampletemperature)
Electrical Connecons:
4+4springloadterminals,max1.5mm2
CableEntry:M20
Pressure ngs:
Male 5.2mm
+Highpressure
-Lowpressure
Electrical
Supply voltage:
24VACorVDC±10%
Power consumpon:
<1.3W
Output signal:
viaModbus
Input signals:
2xinput(0...10V,NTC10k,Pt1000,NI1000/(-LG),or
BININ)
Conformance
Meets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 2023 www.hkinstruments. Installaon version 1.0 2023
SCHEMATICS
DIMENSIONAL DRAWINGS
Figure 1a - Mounng orientaon
Figure 1b - Applicaon connecons
Display connecon
A
B
24 V
GND
LEDs
Joysck 1
Joysck 2
Joysck 3
Select
Up
Down
Menu buons
Terminal
blocks
Pressure
sensors
Input terminal
configuraon
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
Stac pressure Filter/Damper
monitoring
Fan/Blower
monitoring
Not
connected
INSTALLATION
1)Mountthedeviceinthedesiredlocaon(seestep1).
2)Openthelidandroutethecablethroughthestrainreliefand
connectthewirestotheterminalblock(s)(seestep2).
3)Thedeviceisnowreadyforconguraon.
WARNING!Applypoweronlyaerthedeviceisproperlywired.
Pressure
Flow
Thepressuretubesareconnectedtoaowmeasurementprobe(i.e.FloXact),ortothe
measurementportsspeciedbythefanmanufacturer.PleaseseetheFloXactinstal-
laonguideorthefanmanufacturer’stechnicalspecicaonsformoreinformaon.
STEP 1: MOUNTING THE DEVICE
1)Selectthemounnglocaon(duct,wall,panel).
2)Usethedeviceasatemplateandmarkthescrewholes.
3)Mountwithappropriatescrews.
MOUNTING THE DEVICE CONTINUED
STEP 2: WIRING DIAGRAMS
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and2b.
3)Tightenthestrainrelief.
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:
Funcon 04 - Read input register 3x0005
Input 2 NTC10k temperature:
Funcon 04 - Read input register 3x0013
A
B
24 V
GND
+ Power Supply
24VDC / 24VAC
Input 1
Input 2
GND
GND
Modbus
Air handling unit
InatypicalAirHandlingUnitapplicaon,connectthepressureinletAtomeasure
airowandpressureinletBtomeasurethedierenalpressureacrossthelter.
PressureinletAcanbeusedforpressureorowmeasurement.
PressureinletBcanbeusedonlyforpressuremeasurement.
Copyright HK Instruments 2023 www.hkinstruments. Installaon version 1.0 2023
NOTE! Always zero the device before use.
Supplyvoltagemustbeconnectedonehourbeforethezeropoint
adjustmentiscarriedout.AccessviaModbusorbypushbuon.
1)Loosebothtubesfromthepressureinlets+and-.
2)Presstheselectbuonfor1secto
enterthemenuandselectzero sensors.
3)WaitunltheLEDturnsoandtheninstalltubesagainforthe
pressureinlets.
CONFIGURATION CONTINUED
STEP 3: CONFIGURATION
7)SelecttheaddressforModbus:1*...247.
BAUD RATE
9600
SELECT
UP
DOWN
ADDRESS
99
SELECT
UP
DOWN
PARITY BIT
NONE
SELECT
UP
DOWN
8)Selectthebaudrate:9600*/19200/38400.
9)Selecttheparitybit:None*/Even/Odd.
10)Selecttheresponseme:1...20s(factorysetup4s)
RESPONSETIME
20 s
SELECT
UP
DOWN
13)Pushtheselectbuontosavesengsandexitmenu.
SELECT
EXIT MENU SELECT
STEP 4: ZERO POINT ADJUSTMENT
SELECT
1)AcvatethedeviceMenubypushingthetheselectbuonfor1
second.
3)Ifcommon probeisselected,selectmeasurementunitusedinthe
formula:m3/s,m3/h,cfm,l/s,m/sorf/min.
 Note:WhenusingtheFloXactprobe,selecttheformulaunitl/s.
Forotherprobemodels,checkthemanufacturer’sdatasheetfor
thecorrectunit.
FORMULA UNIT
l/s
SELECT
UP
DOWN
4)SelectK-value
EachapplicaonhasaspecicK-value.SelecttheK-valuefromthe
manufacturer’sspecicaons.
AvailableK-valuerange:0.001...9999.000
K-VALUE
9000.000
SELECT
UP
DOWN
5)Selectpressureunitfordisplay:
 Pa,kPa,mbar,mmWC,inWCorpsi
PRESS.UNIT
Pa
SELECT
UP
DOWN
6)Selectowunitfordisplay:
Flowvolume:m3/s,m3/h,cfm,l/s
Velocity:m/s,f/min(selectableonlyifacommonprobeisusedwith
m/sorf/minunit)
FLOW UNIT
m3/s
SELECT
UP
DOWN
2)Selectthefunconingmodeofthedevice:
-SelectManufacturerwhenconnecngDPT-Dual-MOD-AHUtoa
fanwithpressuremeasurementpoints
-SelectCommon probe whenusingDPT-Dual-MOD-AHUwitha
commonmeasurementprobethatfollowstheformula:
 q=k∙√∆P(i.e.FloXact)
11)Selectthethetypeofsensorforinput1:
NTC10k,Ni1000-LG,Ni1000,Pt1000,
VINPUT(voltage010V),none
SENSOR 1
NTC10K
SELECT
UP
DOWN
12)Selectthethetypeofsensorforinput2:
NTC10k,Ni1000-LG,Ni1000,Pt1000,
VINPUT(voltage010V),none
SENSOR 2
NONE
SELECT
UP
DOWN
MANUFACTURER
Common probe
SELECT
UP
DOWN
Common probe Flakt Woods
SELECT
UP
DOWN
*Factorysetup
Copyright HK Instruments 2023 www.hkinstruments. Installaon version 1.0 2023
Thesellerisobligatedtoprovideawarrantyofveyearsforthedeliv-
ered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producon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 defecve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,nor-
malwearandtear,improperorcarelesshandling,abnormaluse,over-
loading,improperstorage,incorrectcareorreconstrucon,orchanges
andinstallaonworknotdonebytheseller.Theseleconofmateri-
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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
3x0001 Programversion 16bit 0...1000 0,00...99,00
3x0002 PressurereadingA 16bit -700...7000 -700...7000(Pa)
3x0003 PressurereadingB 16bit -250...2500 -250...2500(Pa)
3x0004 Input1:0...10V 16bit 0...1000 0...100%
3x0005 Input1:Pt1000 16bit -500...500 -50...+50°C
3x0006 Input1:Ni1000 16bit -500...500 -50...+50°C
3x0007 Input1:Ni1000-LG 16bit -500...500 -50...+50°C
3x0008 Input1:NTC10k 16bit -500...500 -50...+50°C
3x0009 Input2:0...10V 16bit 0...1000 0...100%
3x0010 Input2:Pt1000 16bit -500...500 -50...+50°C
3x0011 Input2:Ni1000 16bit -500...500 -50...+50°C
3x0012 Input2:Ni1000-LG 16bit -500...500 -50...+50°C
3x0013 Input2:NTC10k 16bit -500...500 -50...+50°C
3x0014 Flowm3/s 16bit 0...10000 0...100m3/s
3x0015 Flowm3/h 16bit 0...30000 0...30000m3/h
3x0016 Flowcfm 16bit 0...30000 0...30000cfm
3x0017 Flowl/s 16bit 0...3000 0...3000l/s
3x0018 Velocitym/s 16bit 0...1000 0...100m/s
3x0019 Velocityf/min 16bit 0...5000 0...5000f/min
Funconcode04-Readinputregister
The parts le over from installaon should be
recycled according to your local instrucons.
Decommissioned devices should be taken to a
recyclingsitethatspecializesinelectronicwaste.
STEP 6: MODBUS REGISTERS
RECYCLING/DISPOSAL
WARRANTY POLICY
Funconcode03-Readinputholdingregister
Register Parameter descripon Data Type Value Range
4x0001 Manufacturer 16bit 0...8
0=FläktWoods,1=Rosenberg,
2=Nicotra-Gebhardt,3=Comefri,
4=Ziehl,5=ebm-papst6=Gebhardt,
7=Nicotra,8=Commonprobe
4x0002
Formulaunit(Manufac-
turer=8)
16bit 0...5
0=m3/s,1=f/min,2=m/s,3=l/s,4=cfm,
5=m3/h
4x0003 K-FactorInteger 16bit 0...9999 0...9999
4x0004 K-FactorDecimal 16bit 0...999 0...999
4x0005 ResponseTime 16bit 0...20 0...20s
MODBUS REGISTERS CONTINUED
Funconcode02-Readinputstatus
Register Parameter descripon Data Type Value Range
1x0001 Input1:BININ Bit0 0...1 0=On,1=O
1x0002 Input2:BININ Bit0 0...1 0=On,1=O
Funcon05-Writesinglecoil
Register Parameter descripon Data Type Value Range
0x0001 Zeroingfuncon Bit0 0...1 0=On,1=O
Funconcode06-Writesingleregister
Register Parameter descripon Data Type Value Range
4x0001 Manufacturer 16bit 0...8
0=FläktWoods,1=Rosenberg,
2=Nicotra-Gebhardt,3=Comefri,
4=Ziehl,5=ebm-papst6=Gebhardt,
7=Nicotra,8=Commonprobe
4x0002
Formulaunit(Manufac-
turer=8)
16bit 0...5
0=m3/s,1=f/min,2=m/s,3=l/s,4=cfm,
5=m3/h
4x0003 K-FactorInteger 16bit 0...9999 0...9999
4x0004 K-FactorDecimal 16bit 0...999 0...999
4x0005 ResponseTime 16bit 0...20 0...20s
STEP 5: INPUT SIGNAL CONFIGURATION
InputsignalscanbereadoverModbusviaDPT-MODRS485interface.
Signals Accuracy for measurement Resoluon
0...10V <0,5% 0,1%
NTC10k <0,5% 0,1%
Pt1000 <0,5% 0,1%
Ni1000/(-LG) <0,5% 0,1%
BININ(potenalfreecontact)
Thejumpersshouldbesetaccordingtotheinstruconsbelowandthe
valueshouldbereadfromtherightregister.Bothinputscanbecong-
uredindependently.
Figure 3 - Input signal conguraon
J1
J2
J3
IN1 IN2
J1
J1
J1
J2
J2
J2
J3
J3
J3
NTC10k / BIN IN
Pt1000 / Ni1000/(-LG)
0...10 V
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HK Instruments DPT-Dual-MOD-AHU Installation guide

Type
Installation guide

HK Instruments DPT-Dual-MOD-AHU is a versatile differential pressure transmitter designed for air handling units. It features two differential pressure transmitters in one device, allowing for simultaneous measurements from two different points. With its Modbus interface and Input terminal, it can read multiple signals such as temperature or control relays. The DPT-Dual-MOD-AHU is commonly used for air flow monitoring, fan and blower monitoring, pressure monitoring in cleanrooms, and VAV applications.

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