Air Monitor VELTRON DPT-plus User manual

Installation, Operation,
and Maintenance Manual
VELTRON DPT-plus
Microprocessor Based Ultra-Low Range
Pressure & Flow "Smart" Transmitter
Version 1.4X
Installation, Operation & Maintenance
Air Monitor Corporation provides complete
technical support between the hours of
7 a.m. and 5 p.m. PST, M-F
Contact our Service Department
Toll Free: 1-800-AIRFLOW
or fax us at 1-707-526-2825
Air Monitor Corporation
116-010-91.P65 (09/18/09)
VELTRON DPT-plus - IO&M Manual
Precision Airflow Measurement
An ON
I CON Brand

VELTRON DPT-plus
Air Monitor Corporation
116-010-91.P65 (09/18/09) VELTRONDPT-plus-IO&M Manual
TABLEOFCONTENTS
TABLEOFCONTENTS
INSTRUMENTWARRANTY ...................................................................................................................... i
SECTION1 – GENERALINFORMATION
1.1 DESCRIPTION ................................................................................................................................1
1.2 THEORYOFOPERATION .............................................................................................................. 1
SECTION2 – PERFORMANCESPECIFICATIONS
2.1 TRANSMITTER ............................................................................................................................... 2
2.2 INDICATION..................................................................................................................................... 2
2.3 INPUTS/OUTPUTS .......................................................................................................................... 2
2.4 POWER .......................................................................................................................................... 2
SECTION3 – FEATURES
3.1 USERSETUP MENU...................................................................................................................... 3
3.2 AIRDENSITYCORRECTION .......................................................................................................... 3
3.3 TRANSMITTERHOLD ..................................................................................................................... 3
3.4 AUTOMATICZEROING ................................................................................................................... 3
3.5 ALARM(option)............................................................................................................................... 4
3.6 DATADISPLAY ............................................................................................................................... 4
3.7 K-FACTOR ...................................................................................................................................... 4
3.8 FLOW/DIFFERENTIAL/PRESSURECALCULATOR ........................................................................ 4
3.9 HIGHTURNDOWNRATIOOPERATION .......................................................................................... 5
3.10 HAZARDOUSLOCATIONS.............................................................................................................. 5
3.11 ENCLOSURE .................................................................................................................................. 5
3.12 MULTIPLE OPERATING POWERSELECTIONS ............................................................................. 5
SECTION 4 – INSTALLATION
4.1 RECEIVINGANDINSPECTION ....................................................................................................... 6
4.2 LOCATION ...................................................................................................................................... 6
4.3 MOUNTING .................................................................................................................................. 7-8
4.4 PROCESSCONNECTIONS ............................................................................................................ 9
4.5 POWER/SIGNALCONNECTIONS ............................................................................................10-13
SECTION5 –OPERATION
5.1 INTRODUCTION .......................................................................................................................... 14
5.2 START-UP.................................................................................................................................... 14
5.3 NORMALOPERATION ............................................................................................................... 15
5.4 CONFIGURATION ....................................................................................................................... 15
5.5 PUSHBUTTON DEFINITION....................................................................................................... 16
5.6 CONFIGURATION PROGRAMMING ....................................................................................17-18
5.7 TRANSMITTER SCALING & CONFIGURATION ..................................................................19-29
5.8 LOW PASS FILTER .................................................................................................................... 30
5.9 AUTO-zero CONFIGURATION ................................................................................................... 31
5.10 AUTO-purge CONFIGURATION ................................................................................................. 32

TABLEOFCONTENTS
SECTION 5 – OPERATION (con't)
5.11 ALARM CONFIGURATION ....................................................................................................33-34
5.12 K-FACTOR CONFIGURATION ..............................................................................................35-36
5.13 DISPLAY CONFIGURATION .................................................................................................37-41
5.14 ANALOG OUTPUT CONFIGURATION....................................................................................... 42
5.15 TRANSDUCER SPAN SELECTION........................................................................................... 43
5.16 TRANSMITTER INPUT CALIBRATION ...................................................................................... 44
5.17 TRANSMITTER OUTPUT CALIBRATION .................................................................................. 44
5.18 TRANSMITTER CHARACTERIZATION SELECTION ................................................................ 44
5.19 DISPLAY INTERNAL TEMPERATURE...................................................................................... 45
5.20 TRANSMITTER RESET .............................................................................................................. 45
SECTION 6 – CALIBRATION
6.1 REQUIRED EQUIPMENT........................................................................................................... 46
6.2 PREPARATION ........................................................................................................................... 46
6.3 TRANSMITTER INPUT CALIBRATION .................................................................................47-50
6.4 TRANSMITTER OUTPUT CALIBRATION .............................................................................51-52
SECTION 7 – MAINTENANCE ........................................................................................................... 53
SECTION 8 – TROUBLESHOOTING................................................................................................. 54
SECTION 9 – PARTS LIST................................................................................................................ 55
SECTION 10 – CUSTOMER SERVICE.............................................................................................. 56
APPENDIX A – FACTORY SET-UP INFORMATION SHEET .......................................................... 57
TABLEOFCONTENTS
VELTRON DPT-plus
Air Monitor Corporation
116-010-91.P65 (09/18/09) VELTRONDPT-plus-IO&M Manual

VELTRON DPT-plus
Air Monitor Corporation
116-010-91.P65 (09/18/09) VELTRONDPT-plus-IO&M Manual
i
INSTRUMENT WARRANTY
NOTICEOF PROPRIETARYRIGHTS
Thisdocument contains confidentialtechnicaldata, including trade
secretsandproprietaryinformationwhicharethe soleproperty ofAir
MonitorCorporation. The useofsaid datais solelylimitedto useas
specifiedherein. Any otheruse isstrictly prohibitedwithout theprior
writtenconsent ofAir MonitorCorporation.
INSTRUMENTWARRANTY
AirMonitorCorporation(hereinafter referredtoas“Seller”)
warrants that at the time of shipment, products sold
pursuant to this contract will be free from defects in
materials and workmanship, and will conform to the
specifications furnished or approved in writing by Seller.
Nowarranty is giventhat delivered productswill conform
to catalog sheets, data sheets, and the like, which are
subject to change without notice.
Seller will repair or replace, at its option, any products
listedunderthis warrantywhichis returnedfreightprepaid
toSeller within theearlierof three (3)years after start-up
or thirty-nine (39) months after shipment that, upon test
andexamination, provesdefectivewithintheterms ofthis
warranty. The warranty period for any item repaired or
replaced shall be for the time remaining on the warranty
periodof theoriginal components. Purchasershallnotify
Seller in writing of such defect within sixty (60) days of
discoveryof thedefect.
This warranty does not extend to any product sold by
Seller which has been the subject of misuse, neglect,
accident, damage or malfunction caused by
interconnectionwith equipment manufacturedby others,
improper installation or storage, or used in violation of
instructionsfurnished by Seller,nor does itextend to any
product which has been repaired or altered by persons
notexpresslyapprovedbySeller. Nordoes Sellerwarrant
equipmentagainstnormaldeteriorationduetoenvironment;
noritems suchaslamps, glass,and similaritemssubject
towear orburnoutthrough usage. Adjustmentsforitems
or equipment not manufactured by Seller shall be made
totheextentofanywarrantyofthemanufacturerorsupplier
thereof.
Seller shall not be liable for any special or consequential
damagesorforlossofdamage,directlyorindirectlyarising
from the use of the products. Seller's warranty shall be
limited to replacement of defective equipment and shall
notinclude field removaland installationexpenses.
Thewarrantysetforthaboveisinlieuofallotherwarranties
eitherexpress orimplied and constitutesthe fullextent of
Air Monitor Corporation’s liability to the customer, or any
otherpartyforbreach ofwarranty.
THEREARE NOEXPRESSWARRANTIESEXCEPTAS
SET FORTH HEREIN AND THERE ARE NO IMPLIED
WARRANTIES OF MERCHANTABILITY OF FITNESS
FOR ANY PARTICULAR PURPOSE, WHICH ARE
PARTICULARLYDISCLAIMED.

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SECTION1–GENERALINFORMATION
1 – GENERAL INFORMATION
1.1 – DESCRIPTION
TheVELTRONDPT-plus ultra-lowrangepressureandflow"smart"transmitterisdesignedtoconvert thelowmagnitude
pressure signal generated by airflow station or probe, and a temperature input into 4-20mA signals proportional and
lineartoflow (orpressure)andtemperature. TheVELTRONDPT-plusisequipped withAUTO-zeroforthe eliminationof
zeroerrordue tothermal,electric, ormechanicaleffects. TheVELTRONDPT-plusispackagedinaNEMA4Xenclosure
withindustry-standard processconnections. The integralLCD displayprovidesa continuousreadout ofthe measured
processand two additionallines of operatingdata.
1.2 – THEORY OF OPERATION
Highand low pressuresignals generated byairflow stations andprobes, or staticpressure sensors actupon opposite
sides of a flexible diaphragm within the transducer. The differential between the two pressure signals displaces the
diaphragm; the magnitude of the displacement being measured creates an electrical DC output from the transducer.
AfterundergoingA/Dconversion, the resultingdigitalsignal representing differentialpressureor velocitypressurecan
be"manipulated" withinthemicroprocessor: square rootedfor velocityorflow application;scaled for unitsof measure
and area for process output; and scaled for local data display. The built-in microprocessor runs the program that
provides the following basic functions: Timing, logic, and mathematical operations, analog input signal multiplexing,
analog input/output calibration, output relay operation, automatic zeroing valve operation, User Setup menu system,
anddisplay (LCD)indication.

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SECTION2–PERFORMANCESPECIFICATIONS
2 – PERFORMANCE SPECIFICATIONS
2.2 – INDICATION
Display. Abacklit,graphical LCDproviding threelines of
data display. Also used for programming.
2.3 – INPUTS/OUTPUTS
Analog Inputs. Differentialpressure (highand low),and
4-20mA, 2-wire, internally or externally loop powered
temperaturesignal.
Analog Outputs. Dual4-20mA outputs,configurableas
internally powered/non-isolated, or externally powered/
isolated.
Digital Input. Dry contactinput for notificationofAUTO-
purgestart(fromAUTO-purgepanel).
Digital Outputs. Dual Form A dry contacts rated for 3
ampsat24VAC/VDC foroptionalHI/LO alarm;or FormA
drycontactsforAUTO-purgeacknowledgment.
Temperature Compensation Selection. Pushbutton
selectionoflinearizedornon-lineartemperaturetransmitter
inputfor the followingtemperature sensingtypes:
TypeE –50to 1750ºF –50to 950ºC
TypeT –50 to 750ºF –50to 400ºC
TypeJ –50to2000ºF –50 to1090ºC
TypeK –50to 2000ºF –50to 1090ºC
RTD –50to 1500ºF –50to 815ºC
2.4 – POWER
Power Supply.
Standard24VAC (20-28VAC) or24VDC(20-32VDC).
Optional120VAC(100-132VAC),viaexternal
transformer.
Power Consumption.
Standard: 8VAat 24VAC; 6VAat 24VDC; 36VAat
120VAC.
Circuit Protection. Powerinput is fusedandreverse
polarityprotected.
2.1 – TRANSMITTER
Accuracy. 0.1% of NaturalSpan,including hysteresis,
deadband,non-linearity,and non-repeatability.
Type. Differentialpressure, flow, andmass flow.
Ranges.NaturalSpans Bi-PolarNaturalSpans
0to25.00 IN w.c.
0to 10.00 INwF±10.00to 10.00INw.c.
0to 5.00INw.c. – 5.00to 5.00 INw.c.
0to 2.00INw.c. – 2.00to 2.00 INw.c.
0to 1.00INw.c. – 1.00to 3.00 INw.c.
0to 0.50INw.c. – 0.50to 0.50 INw.c.
0to 0.25INw.c. – 0.25to 0.25 INw.c.
0to 0.10INw.c. – 0.10to 0.10 INw.c.
0to 0.05INw.c. – 0.05to 0.05 INw.c.
Span Rangeability. The calibrated span can be down
rangedto 40% oftheNatural Span.
Stability. ±0.5% of Natural Span for six months.
Temperature Effect.
Zero. None;corrected byAUTO-zero.
Span. 0.015% of Natural Span/ºF.
Mounting Position Effect. None;corrected through
transmitterautomatic zeroing.
Span and Zero Adjustment. Digital, via internally
locatedpushbuttons.
Low Pass Filtration. Response time to reach 98% of
a step change is adjustable from 2.0 to 250.0 seconds.
Max Zero Elevation and Suppression. 100% of
NaturalSpan.
Overpressure and Static Pressure Limit. 25 psig.
Automatic Zeroing.
Accuracy.Within 0.1% of calibrated span.
Frequency.Every 1to 24 hourson1 hour intervals.
Temperature Limits.
–20to 180ºF Storage; +32 to140ºF Operating.
Humidity Limits. 0-95%RH, non-condensing.

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SECTION 3 – FEATURES
3 – FEATURES
3.1 – USER SETUP MENU
The microprocessor program contains a User Setup menu system for setting user selectable parameters. Four
pushbuttons: , , , and allow the user access to the menu for setting configuration modes and values.
Refer to the Configuration Programming (Section 5.6) instructions for operation details. Also contained in the User
Setup menu is all input and output calibration. The calibration method is completely digital and contains no analog
potentiometeradjustments whichare susceptibletodrift. Non-volatile memoryis usedfor storingall setupparameters
andcalibration values, andwill remain unchangedafter set, evenwhen power tothe unit isoff.
3.2 – AIR DENSITY CORRECTION
TheVELTRONDPT-plustransmitter iscapable ofaccepting aprocess temperatureinputto performdensity correction
to volumetric or mass flow. Temperature input is a 4-20mAsignal from a remote temperature transmitter; non-linear
temperatureinputs canbe linearized bythe microprocessor.
3.3 – TRANSMITTER HOLD
Certainoperations performedby themicroprocessor placethe unitinto aHold mode. Thisoccurs whenthe UserSetup
menu system is activated, when anAUTO-zero is performed, or when anAUTO-purge cycle is in progress. When in
Hold, all Normal mode processing is halted and outputs are held at their last value prior to Hold. Normal operation is
indicated by the "CPUActivated" (dot) in the upper right of the display blinking at a rate of four times per second. A
Hold mode is indicated by the "CPUActivated" (dot) blinking at a rate of once per second.
3.4 –AUTOMATIC ZEROING
At periodic intervals the microprocessor will automatically execute an AUTO-zero cycle consisting of the following
sequence: The transmitter output and display signals are put on Hold; a valve is activated which disconnects the
process high pressure from the high port of the transducer and connects the process static pressure to both sides of
the transducer, creating a true zero differential pressure; after a brief stabilization period, the transducer zero offset
signalismeasured andstoredinmemory;thevalveis deactivatedandafter abriefperiod forprocesssignalstabilization,
theHold is releasedandNormal process measurementresumes. will be displayedwheneverAUTO-zerocycle
is in progress.
During Normal operation, the zero offset value stored in memory is subtracted from subsequent transducer readings
until the nextAUTO-zero cycle occurs and repeats the process. For calibration purposes a switch is provided which
allowsthe user tomanually activate thezeroingvalve. AUTO-zeroOn/Offand Interval areavailable and configurable
using the User Setup menu.
X
zero

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3.5 –ALARM (option)
The VELTRON DPT-plusAlarm provides the means forhaving the process signal comparedto user selectablealarm
points and automatically activates a Form A relay to generate dry contact alarm signal(s). User selectable alarm
configurationsof Low/High,Low1/Low2, andHigh1/High2 plusAlarmsOn/Off,Setpoints, DeadBands, andDelays are
configurablevia the UserSetup menu. Alarm Setpointscan bedisplayed during Normaloperatingmode.
Onechoice amongthree alarmtypes areavailable tothe user:Low/High;Low1/Low2;orHigh1/High2. AnAlarm Delay
is available, if implemented (any time setting greater than zero), any condition that would normally cause an alarm,
triggers the delay timer first. If the alarm condition still exists after the delay times out, then the appropriate alarm
relay(s)are activated. willbe displayed wheneveranyalarm relay isactivated. Alarm On/Off,Type,Setpoints,
Deadbands, and Delays are available and configurable using the User Setup menu. The Alarm Setpoints can be
displayedduring Normaloperation.
HighAlarm ProcessSignal High2Alarm
Point Point
ProcessSignal Low1Alarm High1Alarm
Point Point
LowAlarm Low2Alarm Process
Point Point Signal
Low/High Alarm Low1/Low2 Alarm High1/High2Alarm
3.6 – DATA DISPLAY
Theintegral displayis amulti-line,backlit graphicalLCD capableof displayingthreelines ofoperating data. Itcan also
display a user settable I.D. number using any combination of standardASCII characters. It is also used by the User
Setupmenufordisplayingthe menuparametersand values. ConfiguringthedisplayforNormal operationis doneusing
theUserSetup menu.
3.7 – K-FACTOR
TheVELTRON DPT-plus isequipped with aK-factor feature whichallows for thecalculation and introductionof a bias
and/or gain factor into the transmitter's flow calculations. The K-factor feature is intended to be used in two types of
applications:
1. Toadjustfor flowmeasurement erroras aresult ofhighly distortedairflow inducedby upstreamordownstream flow
disturbances.
2. To adjust the transmitter's output to bring it into close correlation with field measured flow data.
TheK-Factor gainandbias valuescan beentered directlyortheVELTRONDPT-plus cancalculatethesevaluesbased
onmeasured andreferencevalues froma 1,2 or 3point airflowtraverse.
3.8 – FLOW/DIFFERENTIAL PRESSURE CALCULATOR
TheVELTRONDPT-plus isequipped withan integralcalculatorfeaturethatallowstheuser todetermine themaximum
flow or differential pressure from the appropriate variables. This feature allows the user to determine input or output
valuesat variouspointsof theprocess ornew valuesif theprocess parametershavechanged. Also, thecalculator can
beused to implementa single-point densitycompensation foroperatingtemperature and/orabsolute pressure.
SECTION 3 – FEATURES
alrm

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3.9 – HIGH TURNDOWN RATIO OPERATION
TheVELTRONDPT-plustransmitter,with itshighlevelof accuracyand automaticzeroing circuitry,can maintainlinear
outputsignals onapplications requiringvelocity turndownof10 to1 (equalto avelocity pressureturndownof 100to 1).
3.10 – HAZARDOUS LOCATIONS
HazardousLocations. The VELTRONDPT-plus transmitterisFactory Mutualapproved forthe following:
• Explosion Proof: Class 1, Division 1, Groups B, C, D.
• Dust Ignition Proof: Class II, III, Division 1, Groups E, F, G.
• Suitableforindoor andoutdoorNEMAType 4Xhazardous locations.
3.11 – ENCLOSURE
The VELTRON DPT-plus transmitter is packaged in a NEMA Type 4X enclosure with standard industrial process
connections.
3.12 – MULTIPLE OPERATING POWER SELECTIONS
TheVELTRONDPT-pluscanbepoweredby24VACor24VDC.
5
SECTION 3 – FEATURES

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4 – INSTALLATION
SECTION4–INSTALLATION
4.1 – RECEIVING AND INSPECTION
• CarefullyremovetheVELTRONDPT-plusfromtheshipping containerandinspectforanydamage. Ifanydamagehas
occurredintransit, contactfreight carrier.
• Savetheshipping containerforpossiblefuture useinreturning theVELTRONDPT-plus tothe factoryforrecalibration.
• Included inthe shippingcontainerare twosparefusesandMountingBracketKitconsisting of: Two-piece bracket,U-
bolt, and necessary hardware. If any items are missing, contact the Customer Service Department at 1-800-AIR-
FLOW.
• Reviewthe FactorySet-Up InformationSheet providedseparatelyandverify theW.O. #and Serial# matchthose on
theVELTRONDPT-plus. Verify thatthe configurationrecordedontheFactory Set-UpInformation Sheetiscorrectfor
yourapplication. If not,contactAirMonitor's CustomerService Departmentat1-800-AIRFLOW forfurther guidance.
Note: The VELTRON DPT-plus has been configured and calibrated to customer specified parameters (see "Fac-
tory Setup Information Sheet" at the end of this Manual), and requires no additional calibration/verification
prior to installation.
4.2 – LOCATION
• TheVELTRON DPT-plus is housedin a NEMAType 4Xenclosure which issuitable foroutdoor locations.
• The VELTRON DPT-plus is Factory Mutual approved as explosion proof for Class I, Division 1, Group B, C, and D;
dust-ignitionproof for ClassII/III,Division 1, GroupsE, F,and Ghazardous(classified) location, indoorand outdoor
(NEMAType 4X).
• The ambienttemperature of theselected mountinglocationmust bebetween 32º –140ºF. Consideration shouldbe
given to units installed in enclosures exposed to direct sunlight.
• TheVELTRON DPT-plus maybe mounted inany position orattitude and isnot affectedbyanyreasonable shockor
vibration.

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4.3 – MOUNTING
Although not required, the most convenient method for mounting the VELTRON DPT-plus is utilizing the included
MountingBracket Kit. Figure 4.1shows howthevarious componentsare assembled, andFigure 4.2 depictsa variety
ofmounting orientations.
Figure4.1
CAUTION
Do not rotate the electronics enclosure relative to the base. Internal signal tubing
couldbecome twistedorkinked, causingpossible transduceroverpressurization,voiding warranty.
SECTION4–INSTALLATION

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4.3 – MOUNTING (con't)
If using the Mounting Bracket Kit, Figure 4.2 depicts a variety of mounting orientations.
Figure4.2
CAUTION
VELTRONDPT-plus shouldnot be mountedsolely by the
processconnections or electricalconduit,which do notprovide sufficient support.
SECTION4–INSTALLATION

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SECTION4–INSTALLATION
4.4 – PROCESS CONNECTIONS
The VELTRON DPT-plus has two 1/4"-18 FPT process connections at 2-1/8" center-to-center on the bottom of the
stainless steel base.
Figure4.3
To the selected process connections, customer should install appropriate fitting required to connect process signal
tubing/pipingfrom processsensor.
Whenconnecting theVELTRONDPT-plus toan airflowmeasuring device,connections mustbecompleted asfollows:
– HighPort onVELTRON DPT-plus connectstoTotalPressurefrom airflowmeasuring device.
– LowPort on VELTRONDPT-plus connectsto StaticPressure from airflowmeasuring devices.
Whenconnecting VELTRONDPT-plus for positiveroom pressurization, connectionsmust becompletedas follows:
– HighPort on VELTRON DPT-plus connectsto sensorfrommonitored room.
– LowPort onVELTRON DPT-plus connectsto referencesensor.
Whenconnecting VELTRONDPT-plus for negativeroom pressurization,connectionsmust becompleted as follows:
– HighPort onVELTRON DPT-plus connectstoreference sensor.
– LowPort on VELTRON DPT-plus connectsto sensorfrommonitored room.
Althoughany sizeoftube/pipecanbe used,the responsetime oftheVELTRON DPT-plusto processchange increases
if with increasing tube/pipe size or increasing in tube/pipe length.
CAUTION
It is extremely important that no pressure be present in signal tubing at the time
ofinstallation,and the orientationofhigh and lowpressuresignal lines
ismaintainedbetweenthe sourceand theVELTRON DPT-plus.

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SECTION4–INSTALLATION
4.5 – POWER/SIGNAL CONNECTIONS
All electrical connections are done at the terminal strips located under the Terminal Side enclosure cover. All wiring
shouldbe routed throughoneor both 3/4"-14NPT conduit connections.See Figure 4.4.
Figure4.4 represents theterminal strip andthe connections forinput power andthe variousinputs/outputsavailable.
Figure4.4
WIRING. It is recommended that all wiring be 14 to 22AWG. 14AWG is the maximum gauge that the terminal strip
canaccommodate. No morethan twowires shouldbe connectedto anyone terminal. 18AWG isthe maximumgauge
wire that can be doubled up in one terminal.
Note: It is recommended that an ON/OFF switch be placed in line of the incoming power to allow turning power on
andoff. Powershouldbe OFFwhen connecting powerwiring to theVELTRONDPT-plus.
POWERSUPPLY(TerminalsLINE andNEUT). Powerrequired bythe VELTRONDPT-plusmust beconnected tothe
twoterminals labeledLINE andNEUT. Earthgroundshouldbeconnectedtotheterminallugprovidedontheupperleft
mounting stud (see Figure 4.4). Power supply must be 20-28VAC or 20-32VDC. When powering multiple units from
onepower source, polaritymustbe maintained.

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SECTION4–INSTALLATION
4.5 – POWER/SIGNAL CONNECTIONS (con't)
OUTPUT 1. Thisoutput representsthemeasuredprocessandisprovidedaseitherinternallypowered/non-isolatedor
externallypowered/isolated. ReviewtheFactoryInformation Set-UpSheet(at theend ofthismanual) todetermine how
yourunit is configured. Whichof the followingconnection methods touse is determinedby howtheunit isconfigured.
INTERNALLY POWER/NON-ISOLATED (Terminals 2(SIG COM) and 3(OUT-1)). This4-20mAoutputis sourced
(powered)by the VELTRONDPT-plus. Maximumload resistanceis dependenton the powersupplyvoltage,see
loadgraph (Figure4.5).
Figure4.5
EXTERNALLY POWERED/ISOLATED (Terminals 3(OUT-1) and 5 (ISO PWR INPUT)). Power forthis4-20mA
output is via an external (customer provided) 12-32VDC supply. Maximum load resistance is dependent on the
powersupply voltage,see loadgraph (Figure4.6)
Figure4.6

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SECTION4–INSTALLATION
4.5 – POWER/SIGNAL CONNECTIONS (con't)
OUTPUT 2. This output can represent temperature, process, or process D.P., and is provided as either internally
powered/non-isolatedorexternallypowered/isolated. ReviewtheFactoryInformationSet-UpSheet(providedseparately)
todetermine how yourunitis configured. Which ofthe following connectionmethods to useisdetermined by howthe
unitis configured.
INTERNALLY POWER/NON-ISOLATED (Terminals 2(SIG COM) and 4(OUT-2)). This4-20mAoutputis sourced
(powered)by the VELTRONDPT-plus. Maximumload resistanceis dependenton the powersupplyvoltage,see
loadgraph (Figure4.5).
EXTERNALLY POWERED/ISOLATED (Terminals 4(OUT-2) and 5 (ISO PWR INPUT)). Power forthis4-20mA
output is via an external (customer provided) 12-32VDC supply. Maximum load resistance is dependent on the
powersupply voltage,see loadgraph(Figure 4.6).
Note: Ifitisdesiredto changefrominternally poweredto externallypowered(or viceversa), itisrequired thatjumpers
J1 through J5 be changed in addition to the change in wiring at the terminal strip.
Jumpers J1 through J5 are located on theAnalog Board (see Section 9 – Parts List for location).
Figure 4.7 below shows the details of Jumpers J1 through J5. For internally powered, all jumper connectors
mustbe placed overthe two jumperpins labeledDIR. Forexternally powered,all jumper connectorsmust be
placedover the twojumper pinslabeledISO.
Thesejumpers affectboth Output1 andOutput 2,such thatbothare setthe same(i.e. bothinternally powered
orboth externallypowered).
Figure4.7
Figure4.7 depicts jumperssetfor internallypowered.

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SECTION4–INSTALLATION
4.5 – POWER/SIGNAL CONNECTIONS (con't)
ALARM 2/AUTO-purgeACKNOWLEDGMENT (Terminals 6(PURGE ACK) and 7(COM)). This set of unpowered
relay contacts is used forAlarm 2 status or asAUTO-purge acknowledgment. Contacts are normally open and close
atthe existenceof an alarmcondition orthe initiationofanAUTO-purgecycle. ReviewtheFactory InformationSet-Up
Sheet(provided separately)to determinewhich (if any)your unitisconfigured for.
AUTO-purge"START"SIGNAL(Terminals9(PURGE STARTINPUT)and10(GND)). Customertoprovidemomentary
(0.5 to 10 seconds unpowered) dry contact as notification ofAUTO-purge cycle initiation. Upon receiving this signal,
transmitterhold will beactivated.
TEMPERATURE INPUT (Terminals 2(SIG COM), 11(TEMP INPUT), and 12(LOOP POWER). Followtheappropriate
Figurebelow forconnectinga temperatureinput signal.
Figure4.8 Figure 4.9
ALARM 1 (Terminals13(PURGE POWER) and 14(NEUT)). This set of relay contacts is used for Alarm 1 status.
Contacts are normally open and only close at the existence of an alarm condition.

VELTRON DPT-plus
Air Monitor Corporation
116-010-91.P65 (09/18/09) VELTRONDPT-plus-IO&M Manual
5.1 – INTRODUCTION
TheVELTRONDPT-plus hasbeenconfiguredandcalibrated attheFactory tocustomerspecified parameterswhichare
recordedon theVELTRON DPT-plus FactoryInformation Set-UpSheet,provided separately. Reviewthis information
and verify that the VELTRON DPT-plus set-up is correct for your application. If any problems or discrepancies are
detected,contactAirMonitor's Customer ServiceDepartmentat1-800-AIRFLOW priorto proceeding.
5.2 – START-UP
1. AfterInstallationhasbeen verified inaccordance with Section4 apply power.
2. Display will briefly indicate:
DPT-plus Dot will blink at a rate of once per second
Version 1.40* *Youractualversion maybe different.
Followedby:
DPT-plus 
Version 1.40
After 5 seconds, display will indicate:
DPT-plus 
Version 1.40
Thanks for Choosing
AIR MONITOR
forapproximately 10 seconds(to performAUTO-zero),and thenreturn to Normaldisplay mode, andthe dotinthe
upper right ofthe display indicating CPUActivated will blinkrapidly (4 times persecond). This is Normaloperation
modeandno further user interface isrequired. If, however, user would liketoverify configuration or change user
selectableparameters,continue toSection 5.4entitled"CONFIGURATION".
14
SECTION5 – OPERATION
5 – OPERATION
zero

VELTRON DPT-plus
Air Monitor Corporation
116-010-91.P65 (09/18/09) VELTRONDPT-plus-IO&M Manual
15
5.3 – NORMAL OPERATION
UnderNormal operation the VELTRONDPT-plus display willcontinuouslyindicate current processvariables or other
selectedparameters.
AUTO-zero. Atperiodical intervals*(see Factory Set-Up InformationSheet) theAUTO-zerocycle will beinitiated.
When this occurs, the display values and outputs will remain constant and will appear in the upper right of
thedisplayfor the duration of theAUTO-zerocycle.
Thiscycle will not occurifAUTO-zerohas been turned OFFin configuration programming(see Section 5.9).
TheAUTO-zerocyclecanbe manuallyactivatedby user(ifON inconfigurationprogramming) bysimultaneously
pressing and . Cover must be removed to gain access to pushbuttons (see Section 5.4).
If remains on after theAUTO-zero cycle is complete or flashes rapidly, refer to Section 8 - Troubleshooting
forrequired action.
*Note: – Theinterval clock forAUTO-zerocyclesis initiatedwhen theVELTRON DPT-plus power isturned on. The
time intervals (preset in User Setup menu) will then start their timing sequence.
– To reset the interval clock, turn power off for a minimum of 10 seconds, then turn power back on. Interval
clock will then initiate at time zero.
– Changing the interval selection in User Setup does not reset time clock.
AUTO-purge. IftheAUTO-purgeoption hasbeenenabled at thefactory (see FactorySet-Up Information Sheet),it
willbe activated atperiodic intervals determinedby the"smartrelay" (locatedin theAUTO-purgepanel)program-
ming. When activated, display will be frozen and all outputs will remain constant, and will appear in the
upperrightof the display forthe duration of thepurge cycle. Length of cycledependson purge duration andafter-
purgeduration (seeFactory Set-UpInformation Sheet).
Alarms. IftheAlarmoptionhas been enabled atthefactory (see Factory Set-UpInformation Sheet) and process
conditions exist to activate the alarm, the will appear in the display and corresponding alarm relay will be
energized(after set delaytime).
5.4 – CONFIGURATION
TheVELTRONDPT-plusonboard microprocessorcontrols Configuration: Operatingparameterselection; input/output
activationand scaling, displayscaling,and transducer calibration.
Thecustomercan verifyconfigurationand changecertainparameters(withindefinedranges)byenteringtheVELTRON
DPT-plus Configurationmode. This isaccomplishedusing thefour pushbuttons locatedbeneath theVELTRON DPT-
plusdisplayend cover.
Togain accessto the programmingpushbutttons,the cover mustbe removed.
CAUTION: Withcover removed, ESD(electrostaticdischarge) precautions shouldbe observed atall times to
protectsensitive components.
SECTION5 – OPERATION
zero
X
zero
purg
alrm