HK Instruments DPI Series User manual

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.

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(12–24AWG)

Relay1:

 Terminalblock(NC,COM,NO)

 Wire:0.2–1.5mm2(12–24AWG)

Relay2:

 Terminalblock(NC,COM,NO)

 Wire:0.2–1.5mm2(12–24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marking:

EMCDirecve2014/30/EU

RoHSDirecve2011/65/EU

LVDDirecve:2014/35/EU

WEEEDirecve2012/19/EU

INTRODUCTION

APPLICATIONS

WARNING

COMPANY WITH

MANAGEMENT SYSTEM

CERTIFIED BY DNV GL

= ISO 9001 = ISO 14001 =

RoHS 2

2011/65/EU

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

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

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

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

COM

Relay 1

COM

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.

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, normal wear

andtear,improperorcarelesshandling,abnormaluse,overloading,im-

properstorage,incorrectcareorreconstrucon,orchangesandinstal-

la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man-

ufacturer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 ex-

change 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

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