HK Instruments DPT-MOD Series User manual

Copyright HK Instruments 2020 www.hkinstruments. Installaon version 7.0 2020
INSTALLATION
INSTRUCTIONS
DIFFERENTIAL PRESSURE TRANSMITTERS
DPT-MOD Series
• READ THESE INSTRUCTIONS CAREFULLY BEFORE
ATTEMPTING TO INSTALL, OPERATE OR SERVICE THIS
DEVICE.
• Failuretoobservesafetyinformaonandcomplywith
instrucons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-MODseriesdier-
enalpressuretransmier.TheDPT-MODseriesisintendedforuse
incommercialenvironments.DPT-MODisamulfunconaltrans-
mierformeasuringvolumeow,velocity,andstacanddieren-
alpressure.Themeasurementscanbereadandtheconguraon
done via Modbus communicaon. DPT-MOD requires less wiring
than the tradional 3-wire transmiers because mulple devices
can be connected on serial line. DPT-MOD can also be used with
several dierent measurement probes such as FloXact™ or pitot
tube,andairdampers.
The DPT-MOD series is comprised of DPT-MOD-2500 and DPT-
MOD-7000 with measurement ranges of -250...2500 Pa and
-250...7000Parespecvely.Allmodelscome withdisplayand op-
onalautozerocalibraon.
DPT-MODseriesdevicesarecommonlyusedinHVAC/Rsystemsfor:
•fan,blowerandltermonitoring
•pressureandowmonitoring
•valveanddampercontrol
•pressuremonitoringincleanrooms
•airowmonitoringacrosscentrifugalfansandblowers
•in-ductairoworpressuremonitoring
•measuringairoworpressureinVAVapplicaons
SPECIFICATIONS
Performance
Accuracy (at applied pressure):
Model2500:
Pressure<125Pa=1%+±2Pa
Pressure>125Pa=1%+±1Pa
Model7000:
Pressure<125Pa=1.5%+±2Pa
Pressure>125Pa=1.5%+±1Pa
(Accuracyspecicaonsinclude:generalaccuracy,
linearity,hysteresis,longterm
stability,andrepeonerror)
Overpressure:
Proofpressure:25kPa
Burstpressure:30kPa
Zero point calibraon:
Automacautozero,manualpushbuonorviaModbus
register
Response me:
1.0−20s,selectableviamenuorviaModbusregister
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
Technical Specicaons
Media compability:
Dryairornon-aggressivegases
Pressure units (select via menu):
Pa,kPa,mbar,inWC,mmWC
Flow units (select via menu):
Volume:m3/s,m3/hr,cfm,l/s
Velocity:m/s,/min
Measuring element:
MEMS,noow-through
Environment:
Operangtemperature:-20...50°C,
-40Cmodels:-40...50°C
Modelswithautozerocalibraon:-5...50°C
Temperaturecompensatedrange0...50°C
Storagetemperature:-40...70°C
Humidity:0to95%rH,noncondensing
Physical
Dimensions:
Case:90.0x95.0x36.0mm
Weight:
150g
Mounng:
2each4.3mmscrewholes,onesloed
Materials:
Case:ABS
Lid:PC
Ductconnectors:ABS
Tubing:PVC
Protecon standard:
IP54
Display
2-linedisplay(12characters/line)
 Line1:Volumeorvelocitymeasurement
 Line2:Pressuremeasurement
Size:46.0x14.5mm
Electrical connecons:
4-screwterminalblock
Wire:0.2–1.5mm2(12–24AWG)
Cable entry:
Strainrelief:M16
Knockout:16mm
Pressure ngs
Maleø5.0mmand6.3mm
Electrical
Supply voltage:
24VACorVDC±10%
Power consumpon:
<1.3W
Output signal:
viaModbus
Conformance
MeetsrequirementsforCEmarking:
EMCDirecve2014/30/EU
RoHSDirecve2011/65/EU
WEEEDirecve2012/19/EU
APPLICATIONS
INTRODUCTION WARNING
COMPANY WITH
MANAGEMENT SYSTEM
CERTIFIED BY DNV GL
= ISO 9001 = ISO 14001 =
RoHS 2
2011/65/EU

Copyright HK Instruments 2020 www.hkinstruments. Installaon version 7.0 2020
SCHEMATICS
DIMENSIONAL DRAWINGS
Figure 1a - Surface mounng
MOUNTING THE DEVICE CONTINUED
Figure 1b - Mounng orientaon
Figure 1c - Applicaon connecons
Connecon for display
Terminal block
Pressure
sensor
Menu buons
LED
SELECT
UP
DOWN
ZERO
B
A
24 V
GND
90.0
77.0
71.5
53.0
4.2
95.0
36.0
DPT
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installaon
guideorthefanmanufacturer’stechnicalspecicaonsformoreinformaon.
YES NO NO
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.
STEP 2: WIRING DIAGRAMS
ForCEcompliance,aproperlygroundedshieldingcableisrequired.
1)Unscrewthestrainreliefandroutethecable.
2)Connectthewiresasshowningure2.
3)Tightenthestrainrelief.
Figure 2 - Wiring diagram
B
A
24 V
GND
+ Power supply
24 VDC / 24 VAC
Modbus
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.
Pressure
Flow
Static pressure Filter/Damper
monitoring
Fan/Blower
monitoring
Not
connected

Copyright HK Instruments 2020 www.hkinstruments. Installaon version 7.0 2020
CONFIGURATION CONTINUED
STEP 3: CONFIGURATION
3)If Commonprobe selected:selectmeasurementunitsusedinthe
formula(akaFormulaunit)(i.e.l/s)
NOTE:Theowunit
none isselectedbydefaultandthedisplay
showsonlythepressurereading.
1)AcvatethedeviceMenubypushingthetheselectbuon
for2seconds
2)Selectthefunconingmodeoftheowmeter:
-Select
Manufacturer whenconnecngDPT-MODtoafan
withpressuremeasurementpoints
-Select
Commonprobe whenusingDPT-MODwithacommon
measurmentprobethatfollowstheformula:
 q=k∙√∆P (i.e.FloXact)
MANUFACTURER
Common probe
SELECT
UP
DOWN
Common probe Flakt Woods
SELECT
UP
DOWN
FORMULA UNIT
l/s
SELECT
UP
DOWN
4)SelectK-value
a.Ifmanufacturerselectedinstep1:
EachfanhasaspecicK-value.SelecttheK-valuefromfanmanufac-
turer’sspecicaons.
Manufacturer: K-value:
Fläktwoods k=0,3...99
Rosenberg k=37...800
Nicotra  k=10...1500
Comefri  k=10...2000
Ziehl  k=10...1500
Ebm-papst k=10...1500
Gebhardt k=50...4700
7)Responseme:Selectresponsemebetween1.0–20s.
RESPONSE TIME
20 s
SELECT
UP
DOWN
11)Pushselectbuontosavechangesandtoexitmenu.
SELECT
EXIT MENU
SELECT
b. If Commonprobe selectedinstep1:
Each common probe has a specic K-value. Select the K-value from
commonprobemanufacturer’sspecicaons.
AvailableK-valuerange:0.001...9999.000.
K-VALUE
9000.000
SELECT
UP
DOWN
8)SelecttheaddressforModbus:1...247.
9)Selectthebaudrate:9600/19200/38400.
ADDRESS
99
SELECT
UP
DOWN
BAUD RATE
9600
SELECT
UP
DOWN
10)Selecttheparitybit:None/Even/Odd.
PARITY BIT
NONE
SELECT
UP
DOWN
STEP 4: ZEROING THE DEVICE
NOTE! Always zero the device before use.
Tozerothedevicethreeoponsareavailable:
1)ManualPushbuonzeropointcalibraon
2)Autozerocalibraon
3)ViaModbusregister
Doesmytransmierhaveanautozerocalibraon?Seetheproductla-
bel.Ifitshows-AZinthemodelnumber,thenyouhavetheautozero
calibraon.
1)ManualPushbuonzeropointcalibraon
NOTE: Supply voltage must be connected at least one hour prior to
zeropointadjustment.
a)Disconnectbothpressuretubesfromthepressureportslabeled+
and–.
b)PushdownthezerobuonunltheLEDlight(red)turnsonandthe
displayreads“zeroing”(displayopononly).(seegure3)
c)Thezeroingofthedevicewillproceedautomacally.Zeroingis
completewhentheLEDturnso,andthedisplayreads0(display
opononly).
d)ReinstallthepressuretubesensuringthattheHighpressuretube
isconnectedtotheportlabeled+,andtheLowpressuretubeis
connectedtotheportlabeled−.
6)Selectowunitfordisplay:
Flowvolume:m3/s,m3/h,cfm,l/s,none(default)
Velocity:m/s,f/min,none
5)Selectpressureunitfordisplay:Pa,kPa,mbar,inWC,mmWCor
none.
PRESS.UNIT
Pa
SELECT
UP
DOWN
FLOW UNIT
m3/s
SELECT
UP
DOWN

Copyright HK Instruments 2020 www.hkinstruments. Installaon version 7.0 2020
Thesellerisobligatedtoprovideawarrantyofveyearsforthedelivered
goodsregardingmaterialandmanufacturing.Thewarrantyperiodiscon-
sideredtostartonthedeliverydateoftheproduct.Ifadefectinrawmate-
rialsoraproducon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defecve
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,normalwearandtear,improperorcarelesshandling,
abnormaluse,overloading,improperstorage,incorrectcareorreconstruc-
on, or changes and installaon work not done by the seller or his/her
authorizedrepresentave.Theseleconofmaterialsfordevicesproneto
corrosion is the buyer’s responsibility, unless otherwise is legally agreed
upon.Shouldthemanufactureralterthestructureofthedevice,theseller
isnotobligatedtomakecomparablechangestodevicesalreadypurchased.
Appealingforwarrantyrequiresthatthebuyerhascorrectlyfullledhis/
herduesarisenfromthedeliveryandstatedinthecontract.Thesellerwill
giveanewwarrantyforgoodsthathavebeenreplacedorrepairedwithin
thewarranty,howeveronlytotheexpiraonoftheoriginalproduct’swar-
rantyme.The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.
2)Autozerocalibraon
If the device includes the oponal autozero circuit, no acon is re-
quired.
Autozero calibraon (-AZ) is an autozero funcon in the form ofan
automaczeroingcircuitbuiltintothePCBboard.Theautozerocali-
braon electronically adjusts the transmier zero at predetermined
me intervals(every10minutes).Thefunconeliminatesalloutput
signaldriduetothermal,electronicormechanicaleects,aswellas
theneedfortechnicianstoremovehighandlowpressuretubeswhen
performing inial or periodic transmier zero point calibraon. The
autozeroadjustmenttakes4secondsaerwhichthedevicereturnsto
itsnormalmeasuringmode.Duringthe4secondadjustmentperiod,
theoutputanddisplayvalueswillfreezetothelatestmeasuredvalue.
Transmiers equipped with the autozero calibraon are virtually
maintenancefree.
3)ViaModbusregister
Makesurethereisnopressureintheductwhenthezeroingisdone
viaModbusregister.
a) Disconnect both pressure tubes from the pressure ports labeled +
and –.
b) Push down the zero buon (joysck) unl the LED light (red)
turns on and the display reads “zeroing” (display opon only). (see
Figure 6)
c) The zeroing of the device will proceed automacally. Zeroing is
complete when the LED turns off, and the display reads 0 (display
opon only).
d) Reinstall the pressure tubes, ensuring the High pressure tube is
connected to the port labeled +, and the Low pressure tube is
connected to the port labeled −.
Press down buon
LED turns ON
Display reads “Zeroing”
LED
Figure 3
ZEROING THE DEVICE CONTINUED
STEP 5: MODBUS REGISTERS
Register Parameter descripon Data Type Value Range
3x0001 Programversion 16bit 0...9900 0,00...99,00
3x0002 Pressurereading 16bit -250...2500/7000 -250...2500/7000Pa
3x0003 Flowm3/s 16bit 0...10000 0...100m3/s
3x0004 Flowm3/h 16bit 0...30000 0...30000m3/h
3x0005 Flowcfm 16bit 0...30000 0...30000cfm
3x0006 Flowl/s 16bit 0...3000 0...3000l/s
3x0007 Velocitym/s 16bit 0...1000 0...100m/s
3x0008 Velocityf/min 16bit 0...5000 0...5000f/min
Funconcode04-Readinputregister
MODBUS REGISTERS CONTINUED
Funconcode06-Writesingleregister
Register Parameter descripon Data Type Value Range
4x0001 Manufacturer 16bit 0...7 0...7
4x0002 Formulaunit(Manufacturer=7) 16bit 0...5
0:m3/s,1:m3/h,2:cfm,3:l/s,
4:m/s,5:f/min
4x0003 K-factorinteger 16bit 0...9999 0...9999
4x0004 K-factordecimal 16bit 0...999 0...999
4x0005 Responseme 16bit 1...20 1...20s
Funconcode16-Writemulpleregisters
Register Parameter descripon Data Type Value Range
4x0001 Manufacturer 16bit 0...7 0...7
4x0002 Formulaunit(Manufacturer=7) 16bit 0...5
0:m3/s,1:m3/h,2:cfm,3:l/s,
4:m/s,5:f/min
4x0003 K-factorinteger 16bit 0...9999 0...9999
4x0004 K-factordecimal 16bit 0...999 0...999
4x0005 Responseme 16bit 1...20 1...20s
Funconcode05-Writesinglecoil
Register Parameter descripon Data Type Value Range
0x0001 Zeropointcalibraon Bit0 0...1 On-O
WARRANTY POLICY
RECYCLING/DISPOSAL
The parts le over from installaon should be
recycled according to your local instrucons.
Decommissioned devices should be taken to a
recyclingsitethatspecializesinelectronicwaste.
Funconcode03-Readinputholdingregister
Register Parameter descripon Data Type Value Range
4x0001 Manufacturer 16bit 0...7 0...7
4x0002 Formulaunit(Manufacturer=7) 16bit 0...5
0:m3/s,1:m3/h,2:cfm,3:l/s,
4:m/s,5:f/min
4x0003 K-factorinteger 16bit 0...9999 0...9999
4x0004 K-factordecimal 16bit 0...999 0...999
4x0005 Responseme 16bit 1...20 1...20s
-40C model: operation in cold environment
Thelidofthedevicehastobeclosedwhentheoperaontemperature
isbelow0°C.Thedisplayneeds15minutestowarmupifthedevice
isstartedintemperaturebelow0°C.
NOTE!Thepowerconsumponrisesandtherecanbeanaddional
errorof0,015voltswhentheoperaontemperatureisbelow0°C.