HK Instruments DPT-Dual-MOD Installation guide
- Type
- Installation guide
HK Instruments DPT-Dual-MOD combines two differential pressure transmitters into one device, enabling pressure measurement from two different points. It features a Modbus interface and an Input terminal for reading signals like temperature or control relays. Use cases include fan, blower, and filter monitoring, pressure and flow monitoring, valve and damper control, and pressure monitoring in cleanrooms.
HK Instruments DPT-Dual-MOD combines two differential pressure transmitters into one device, enabling pressure measurement from two different points. It features a Modbus interface and an Input terminal for reading signals like temperature or control relays. Use cases include fan, blower, and filter monitoring, pressure and flow monitoring, valve and damper control, and pressure monitoring in cleanrooms.
Copyright HK Instruments 2019 www.hkinstruments. Installaon version 8.0 2019
INSTALLATION
INSTRUCTIONS
DIFFERENTIAL PRESSURE TRANSMITTERS
DPT-Dual-MOD 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.
SPECIFICATIONS
ThankyouforchoosinganHKInstrumentsDPT-Dual-MODseries
dierenalpressuretransmier.DPT-Dual-MODcombinestwodif-
ferenalpressuretransmiersintoonedevice.Itoersapossibility
tomeasurepressurefromtwodierentpoints.IthasaModbusin-
terfaceandanInputterminal.
TheInputterminalenablesreadingofmulpleothersignalssuchas
temperatureorcontrolrelaysoverModbus.TheInputterminalhas
two input channels designed to accept 0−10 V, NTC10k, Pt1000,
Ni1000/(-LG),andBININ(potenalfreecontact)signals.Forexam-
ple,DPT-Dual-MODcanreadvaluesfromtwodierenalpressure
measurementpointsandtwotemperaturemeasurementpoints.
DPT-Dual-MODseriesdevicesarecommonlyusedinHVAC/R
systems for:
•fan,blowerandltermonitoring
•pressureandowmonitoring
•valveanddampercontrol
•pressuremonitoringincleanrooms
DPT-Dual-MOD-AHUcanalsobeusedfor:
•airowmonitoringacrosscentrifugalfansandblowers
•in-ductairowmonitoring
•VAVapplicaons
SPECIFICATIONS
Performance
Accuracy (from applied pressure):
Model2500:
Pressure<125Pa=1%+±2Pa
Pressure>125Pa=1%+±1Pa
Model7000:
Pressure<125Pa=1.5%+±2Pa
Pressure>125Pa=1.5%+±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:
•Manualpushbuonautozero
•ViaModbuswritecoil
Technical Specicaons
Media compability:
Dryairornon-aggressivegases
Measuring units on display (Selectable via menu):
Pressure:Pa,kPa,mbar,inchWC,mmWC,psi
Flow(AHUmodel):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
Physical
Dimensions:
Case:102.0x71.5x36.0mm
Weight:
150g,withaccessories290g
Mounng:
2each4.3mmscrewholes,onesloed
Materials:
Case: ABS
Lid:PC
Pressure inlets: Brass
Ductconnectors:ABS
Tubing:PVC
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 connecons:
Male 5,0mmand6,3mm
Electrical
Supply voltage:
24VACorVDC±10%
Power consumpon:
<1.3W
Output signal:
viaModbus
Input signals:
2xinput(0...10v,NTC10k,Pt1000,NI1000/(-LG),or
BININ)
Conformance
MeetsrequirementsforCEmarking:
EMCdirecve2014/30/EU
RoHSDirecve2011/65/EU
WEEEDirecve2012/19/EU
INTRODUCTION WARNING
APPLICATIONS
COMPANY WITH
MANAGEMENT SYSTEM
CERTIFIED BY DNV GL
= ISO 9001 = ISO 14001 =
RoHS 2
2011/65/EU
Copyright HK Instruments 2019 www.hkinstruments. Installaon version 8.0 2019
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 Pressure
inlet 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.PleaseseetheFloXactinstallaon
guideorthefanmanufacturer’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 3x0008
A
B
24 V
GND
+ Power Supply
24VDC / 24VAC
Input 1
Input 2
GND
GND
Modbus
Copyright HK Instruments 2019 www.hkinstruments. Installaon version 8.0 2019
NOTE! Always zero the device before use.
Supplyvoltagemustbeconnectedonehourbeforethezeropoint
adjustmentiscarriedout.AccessviaModbusorbypushbuon.
1)Loosebothtubesfromthepressureinlets+and-.
2)Regularmodel:Presstheselectbuonbriey.
AHUmodel:Presstheselectbuonfor3secto
enterthemenuandselectzero sensors.
3)WaitunltheLEDturnsoandtheninstalltubesagainforthe
pressureinlets.
CONFIGURATION CONTINUED
STEP 3: CONFIGURATION
9)SelecttheaddressforModbus:1...247.
BAUD RATE
9600
SELECT
UP
DOWN
ADDRESS
99
SELECT
UP
DOWN
PARITY BIT
NONE
SELECT
UP
DOWN
10)Selectthebaudrate:9600/19200/38400.
11)Selecttheparitybit:None/Even/Odd.
12)Selectthepressureunitfordisplay:Pa/inchWC/mmWC/psi/mbar.
(Not for AHU model)
PRESS. UNIT
Pa
SELECT
UP
DOWN
13)Selecttheresponseme:1...20s.
RESPONSETIME
20 s
SELECT
UP
DOWN
14)Pushtheselectbuontoexitmenu.
SELECT
EXIT MENU SELECT
STEP 4: ZERO POINT ADJUSTMENT
SELECT
1)AcvatethedeviceMenubypushingthetheselectbuonfor2
seconds.
Points 2–8 for AHU model only:
3)If
commonprobe
selected:selectmeasurementunitsusedinthe
formula(akaFormulaunit)(i.e.l/s)
FORMULA UNIT
l/s
SELECT
UP
DOWN
4)SelectK-value
Each applicaon has a specic K-value. Select the K-value from the
manufacturer’sspecicaons.
AvailableK-valuerange:0.001...9999.000
K-VALUE
9000.000
SELECT
UP
DOWN
5)Selectpressureunitfordisplay:Pa,kPa,mbar,inWCormmWC
PRESS.UNIT
Pa
SELECT
UP
DOWN
6)Selectowunitfordisplay:
Flowvolume:m3/s,m3/h,cfm,l/s
Velocity:m/s,f/min
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)
7)Selectthethetypeofsensorforinput1:
NTC10k, Ni1000-LG, Ni1000, Pt1000, VINPUT (voltage 0–10 V),
none(sensor1willnotbeshownondisplay)
SENSOR 1
NTC10K
SELECT
UP
DOWN
7)Selectthethetypeofsensorforinput2:
NTC10k, Ni1000-LG, Ni1000, Pt1000, VINPUT (voltage 0–10 V),
none(sensor2willnotbeshownondisplay)
SENSOR 2
NONE
SELECT
UP
DOWN
MANUFACTURER
Common probe
SELECT
UP
DOWN
Common probe Flakt Woods
SELECT
UP
DOWN
Copyright HK Instruments 2019 www.hkinstruments. Installaon version 8.0 2019
Thesellerisobligatedtoprovideawarrantyofveyearsforthedeliv-
eredgoodsregardingmaterialandmanufacturing.Thewarrantyperiod
isconsideredtostartonthedeliverydateoftheproduct.Ifadefectin
rawmaterialsoraproduconawisfound,thesellerisobligated,when
theproductissenttothesellerwithoutdelayorbeforeexpiraonof
thewarranty,toamendthemistakeathis/herdiscreoneitherbyre-
pairingthedefecveproductorbydeliveringfreeofchargetothebuy-
eranewawlessproductandsendingittothebuyer.Deliverycosts
fortherepairunderwarrantywillbepaidbythebuyerandthereturn
costsbytheseller.Thewarrantydoesnotcomprisedamagescausedby
accident, lightning, ood orothernaturalphenomenon, normal wear
andtear,improperorcarelesshandling,abnormaluse,overloading,im-
properstorage,incorrectcareorreconstrucon,orchangesandinstal-
laonworknotdonebythesellerorhis/herauthorizedrepresentave.
Theseleconofmaterialsfordevicespronetocorrosionisthebuyer’s
responsibility,unlessotherwiseislegallyagreedupon.Shouldtheman-
ufactureralterthestructureofthedevice,thesellerisnotobligatedto
makecomparablechangestodevicesalreadypurchased.Appealingfor
warrantyrequiresthatthebuyerhascorrectlyfullledhis/herdues
arisenfromthedeliveryandstatedinthecontract.Thesellerwillgive
anewwarrantyforgoodsthathavebeenreplacedorrepairedwithin
thewarranty,howeveronlytotheexpiraonoftheoriginalproduct’s
warrantyme.Thewarrantyincludestherepairofadefecvepartor
device,orifneeded,anewpartordevice,butnotinstallaonorex-
changecosts. Underno circumstanceistheseller liablefor damages
compensaonforindirectdamage.
Register Parameter descripon Data Type Value Range
3x0001 Programversion 16bit 0...1000 0,00...99,00
3x0002 PressurereadingA 16bit -250...2500/7000 -250...2500/7000(Pa)
3x0003 PressurereadingB 16bit -250...2500/7000 -250...2500/7000(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
AHU model only:
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-AHU model only
Register Parameter descripon Data Type Value Range
4x0001 Manufacturer 16bit 0...7 0...7
4x0002
Formulaunit(Manufac-
turer=7)
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 On-O
1x0002 Input2:BININ Bit0 0...1 On-O
Funcon05-Writesinglecoil
Register Parameter descripon Data Type Value Range
0x0001 Zeroingfuncon Bit0 0...1 On-O
Funconcode06-Writesingleregister-AHU model only
Register Parameter descripon Data Type Value Range
4x0001 Manufacturer 16bit 0...7 0...7
4x0002
Formulaunit(Manufac-
turer=7)
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 / Ni10007(-LG)
0...10 V
-
1
-
2
-
3
-
4
HK Instruments DPT-Dual-MOD Installation guide
- Type
- Installation guide
HK Instruments DPT-Dual-MOD combines two differential pressure transmitters into one device, enabling pressure measurement from two different points. It features a Modbus interface and an Input terminal for reading signals like temperature or control relays. Use cases include fan, blower, and filter monitoring, pressure and flow monitoring, valve and damper control, and pressure monitoring in cleanrooms.
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