HK Instruments DPI Series User manual

Copyright HK Instruments 2022 www.hkinstruments. Installaon version 8.0 2022
INSTALLATION
INSTRUCTIONS
DIFFERENTIAL PRESSURE SWITCHES
DPI 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.
• Fuseatloadsupply(normally6A,10A,16A)doesnotalwayslimit
therelayoutputloadcurrentto6A.RelayMaximumLoad(250Vx
6Ares.)
• Addanexternalfusetorelaycommonconnector.Useame-lag
fuse(max6A)thatisinaccordancewiththestandardIEC60127-2.
Theproductdoesn’thaveaninternalfusefortherelay.
 CAUTION:Theproductmayonlybeconnectedtoovervoltage
categoryIIelectricitynetworkaccordingtoIEC60664-1.
SPECIFICATIONS
ThankyouforchoosinganHKInstrumentsDPIserieselectronicdif-
ferenalpressureswitch.TheDPIseriesisintendedforuseincom-
mercialenvironments.Itcombinestheadvantagesofanelectronic
dierenal pressure switch (on-o relay) and a mul-funconal
dierenal pressure transmier to meet your applicaon require-
ments.
The DPI series is comprised of the DPI±500 with bi-direconal
measurementrangesfrom±100to±500PaandtheDPI2500with
measurementrangesfrom100to2500Pa.
AllDPIseriesdevicesincludeonerelay,display,manualpushbuon
zeropointcalibraonandspanpointcalibraon.Oponalfeatures
includeasecondrelayandautozerocalibraon.
DPIseriesdevicesarecommonlyusedinHVAC/Rsystemsfor:
•fan,blowerandltermonitoring
•staircasepressuremonitoringandalarm
•pressuremonitoringincleanrooms
•boilerpressuremonitoringandalarm
SPECIFICATIONS
Performance
Accuracy:
±1.5%(±0.7%*)
%FSfromhighestpressurerange(including:
generalaccuracy,temperaturedri,linearity,hysteresis,
andrepeonerror)
*Canbeachievedwithspanpointcalibraon
Long term stability:
Typical1year
Withautozero:±1Pa
Withoutautozero:±8Pa
Thermal eects:
Temperaturecompensatedacrossthefullspectrumof
capability
Overpressure:
Proofpressure:25kPa
Burstpressure:30kPa
Zero point calibraon:
Automacwithautozero(-AZ)circuitor
Manual via menu
Response me:
0.5–10s,selectableviamenu
Technical Specicaons
Media compability:
Dryairornon-aggressivegases
Measuring units:
Pa,kPa,mmWC,inWC,mbarselectableviamenu
Measuring element:
Piezoresisve
Environment:
OperangTemperature:
 Withoutautozero:-10...50°C
 Withautozero:-5...50°C
Storagetemperature:-20...70°C
Humidity:0to95%rH,noncondensing
Physical
Dimensions:
Case:89x86.5x37.1mm
Weight:
150g
Mounng:
Case:2each4.3mmholes
Lid:2each4.3mmholes
Materials:
Case: ABS
Lid:PC
Ductconnectors:ABS
Tubing:PVC
Protecon standard:
IP54
Touchsensivebuonsonthelid:
Menu,Back,OK,downarrow,uparrow
Display:
31/2digitLCDbacklitdisplay
Size:46.0Wx14.5Hmm
Electrical connecons:
n/out:
 Terminalblock(24V,GND,0–10V)
 Wire:0.2–1.5mm2(16–24AWG)
Relay1:
 Terminalblock(NC,COM,NO)
 Wire:0.2–1.5mm2(16–24AWG)
Relay2:
 Terminalblock(NC,COM,NO)
 Wire:0.2–1.5mm2(16–24AWG)
Cable entries:
Strainrelief:M16&M20
Knockout:16mm
Knockout:20mm
Pressure ngs:
5.2mmbarbedbrass
 +Highpressure
 −Lowpressure
Electrical
Circuit:3-wire(24V,GND,0–10V)
Input:
 Withoutautozero:21–35VDC/24VAC,±10%
 Withautozero:24VACorVDC,±10%
Output:
 Analog:0–10V
 Relay1:250VAC/30VDC/6A
 Relay2:250VAC/30VDC/6A
 Adjustableswitchingpointandhysteresis
Zero/Spanoutputcalibratedwithin±0.025V
Resistanceminimum:1kΩ
Currentconsumpon:
 35mA+relays(7mAeach)+AZcircuit(20mA)
 +0–10Voutput(10mA)
Conformance
Meetsrequirementsfor:
  CE:  UKCA:
EMC:  2014/30/EU S.I.2016/1091
RoHS:  2011/65/EU S.I.2012/3032
LVD/EESR: 2014/35/EU S.I.2016/1101
WEEE:  2012/19/EU S.I.2013/3113
INTRODUCTION
APPLICATIONS
WARNING
RoHS
COMPLIANT

Copyright HK Instruments 2022 www.hkinstruments. Installaon version 8.0 2022
SCHEMATICS
DIMENSIONAL DRAWINGS
INSTALLATION
Figure 1a - Surface mounng
STEP 1: MOUNTING THE DEVICE
1)Mountthedeviceinthedesiredlocaon(seestep1).
2)Openthelidandroutethecable(s)throughthestrainrelief(s)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.
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.
Figure 1b - Mounng orientaon
Figure 1c - Applicaon connecons
24 V GND 0–10 V
Terminal block Terminal block for relays
NC COM NO NC COM NO
37.1
89.0
86.5
74.5
64.5
52.5
4.2
YES NO NO
Stac pressure Filter/Damper
monitoring
Fan/Blower
monitoring
Not
connected

Copyright HK Instruments 2022 www.hkinstruments. Installaon version 8.0 2022
STEP 2: WIRING DIAGRAMS CONFIGURATION CONTINUED
ForCEcompliance,aproperlygroundedshieldingcableisrequired.
1)Unscrewthestrainreliefandroutethecable(s).Useseparatestrain
reliefforthe0–10Voutputcableandtherelaycable(s).
2)Connectthewiresasshowningure2aand2b.
3)Tightenthestrainrelief.
Figure 2a - Wiring diagram 0–10 V output
Figure 2b - Wiring diagram relay(s)
STEP 3: CONFIGURATION
1)Selectthedesiredmeasurementunit.
2)Selectthedesiredmeasurementrange.
3)Selectthedesiredresponseme.
4)Conguretherelay(s).
5)Zerothedevice.
6)Calibratethespanpoint.
7)Connectthepressuretubes.Connectposivepressuretoport
labeled"+"andnegavepressuretoport"-".
Thedeviceisnowreadytobeused.
24 V
GND
P out
Power supply
24 VDC / 24 VAC
+
Output 0...10 V
V
+
SPAn
ZEro
rEL1/2
rESP
PSEL
UnIt
Pa, kPa, mmH2O, inchWC, mbar
Pressure range selecon
Response me
Relay menu(s)
Zero point calibraon
High point calibraon menu
rES
AdJ
High point calibraon
Reset high point calibraon
HYS
SP
dir
Relay acvaon menu
Relay setpoint
Relay hysteresis 0–50 % of range
FALL
rISE
Relay acvaon on increasing pressure
Relay acvaon on decreasing pressure
NC
COM
NO
Relay 1
NC
COM
NO
Relay 2
With the MENU buon you can enter the menu by pressing the buon for
3 seconds. You can exit the menu without making any
changes.
With the BACK buon you can return without making changes.
With the OK buon you can open new opons or confirm changes and return
to previous display.
With the buons you can scroll the menus.

Copyright HK Instruments 2022 www.hkinstruments. Installaon version 8.0 2022
NOTE! Always zero the device before use.
Tozerothedevicetwooponsareavailable:
1)Manualzeropointcalibraon
2)Autozerocalibraon
Does my transmier have an autozero calibraon? See the product
label.Ifitshows-AZinthemodelnumber,thenyouhavetheautozero
calibraon.
1)Manual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botharrowbuonsontopofthelidshortlyorgoto
conguraonmenuandselect“Zero”.
c)Thezeroingofthedevicewillproceedautomacallywhenthe
greenledontopofthelidturnsoand“Zero”textfollowedby
 acounterfrom3to0secondsappearsonthedisplay.Thezeroing
iscompletewhenthegreenledturnsonagain.
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−.
NOTE:Thezeropointshouldbecalibratedviamanualzeropoint
calibraononehouraerinstallaonandatleastevery12months
duringnormaloperaons.
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auto-
maczeroingcircuitbuiltintothePCBboard.Theautozerocalibraon
electronicallyadjuststhetransmierzeroatpredeterminedmeinter-
vals(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perform-
ing 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.
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 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,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materials
fordevicespronetocorrosionisthebuyer’sresponsibility,unlessother-
wise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warranty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.
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.
STEP 4: ZEROING THE DEVICE WARRANTY POLICY