Air Monitor Corporation AMC POWER VELTRON DPT Instruction manual

Installation, Operation,
and Maintenance Manual
VELTRON DPT
Ultra-LowRange
Pressure& Flow Transmitter
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
116-009-70.P65(09/18/09) VELTRONDPT-IO&MManual

VELTRON DPT
Air Monitor Corporation
116-009-70.P65(09/18/09) VELTRONDPT-IO&MManual
TABLEOFCONTENTS
INSTRUMENTWARRANTY ...................................................................................................................... i
SECTION1– GENERALINFORMATION
1.1 DESCRIPTION ................................................................................................................................1
1.2 THEORYOF OPERATION .............................................................................................................. 1
SECTION2– PERFORMANCE SPECIFICATIONS
2.1 TRANSMITTER ............................................................................................................................... 2
2.2 INDICATION..................................................................................................................................... 2
2.3 INPUT/OUTPUT ............................................................................................................................... 2
2.4 POWER .......................................................................................................................................... 2
SECTION3– FEATURES
3.1 ACCURACY .................................................................................................................................... 3
3.2 PRIMARYSIGNALNOISE FILTER.................................................................................................. 3
3.3 SQUAREROOT FUNCTION(Optional)............................................................................................ 3
3.4 CONTINUOUSDISPLAYOFPROCESS(Optional) ......................................................................... 3
3.5 HIGHTURNDOWNRATIOOPERATION .......................................................................................... 3
3.6 HAZARDOUSLOCATIONS.............................................................................................................. 3
3.7 ENCLOSURE .................................................................................................................................. 3
SECTION 4 – INSTALLATION
4.1 RECEIVINGAND INSPECTION ....................................................................................................... 4
4.2 LOCATION ...................................................................................................................................... 4
4.3 MOUNTING .................................................................................................................................. 5-6
4.4 PROCESSCONNECTIONS ......................................................................................................... 7-8
4.5 POWER/SIGNALCONNECTIONS .................................................................................................. 9
SECTION5–OPERATION
5.1 START-UP ..................................................................................................................................... 10
5.2 NORMALOPERATION.................................................................................................................. 10
5.3 SETTINGSIGNALNOISEFILTER ................................................................................................. 10
SECTION6–CALIBRATION
6.1 REQUIREDEQUIPMENT ...............................................................................................................11
6.2 PREPARATION ..............................................................................................................................11
6.3 TRANSMITTERCALIBRATION ..................................................................................................12-13
6.4 RESPANNING............................................................................................................................... 13
SECTION7– MAINTENANCE ............................................................................................................... 14
SECTION8– TROUBLESHOOTING ..................................................................................................... 15
SECTION 9 – PARTS LIST.................................................................................................................... 16
SECTION10– CUSTOMER SERVICE .................................................................................................. 17
TABLEOFCONTENTS

VELTRON DPT
Air Monitor Corporation
116-009-70.P65(09/18/09) VELTRONDPT-IO&MManual
i
INSTRUMENT WARRANTY
NOTICEOFPROPRIETARYRIGHTS
This document contains confidential technical data, including trade
secretsand proprietary information which are the sole property ofAir
MonitorCorporation. The use of said data issolelylimitedtouse as
specifiedherein. Anyotheruseis strictly prohibited without the prior
writtenconsentofAirMonitorCorporation.
INSTRUMENTWARRANTY
AirMonitorCorporation(hereinafterreferredtoas“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.
Nowarrantyisgiventhat delivered products will 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 warrantywhichisreturnedfreight prepaid
toSellerwithin the earlier of three (3)years afterstart-up
or thirty-nine (39) months after shipment that upon test
andexamination,provesdefective within the termsofthis
warranty. Listed products sold without Seller provided
start-upmustbereturnedfreightpre-paidtotheSellerfor
repair or replacement. The warranty period for any item
repairedorreplaced shall beforthetimeremaining onthe
warranty period of the original components. Purchaser
shallnotifySellerinwritingofsuch defect within sixty (60)
daysof discovery of the defect.
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
interconnectionwithequipmentmanufacturedbyothers,
improper installation or storage, or used in violation of
instructionsfurnishedby Seller, nor does it extend to any
product which has been repaired or altered by persons
notexpresslyapprovedbySeller. NordoesSellerwarrant
equipmentagainstnormaldeteriorationduetoenvironment;
noritemssuchaslamps,glass,andsimilaritemssubject
towearorburnoutthroughusage. Adjustmentsfor items
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
notincludefieldremovaland installation expenses.
Thewarrantysetforthaboveisinlieuofallotherwarranties
eitherexpressorimpliedandconstitutesthefullextentof
Air Monitor Corporation’s liability to the customer, or any
otherpartyfor breach of warranty.
THEREARE NO EXPRESSWARRANTIESEXCEPTAS
SET FORTH HEREIN AND THERE ARE NO IMPLIED
WARRANTIES OF MERCHANTABILITY OF FITNESS
FOR ANY PARTICULAR PURPOSE, WHICH ARE
PARTICULARLYDISCLAIMED.

VELTRON DPT
Air Monitor Corporation
116-009-70.P65(09/18/09) VELTRONDPT-IO&MManual
1 – GENERAL INFORMATION
1.1 – DESCRIPTION
The VELTRON DPT ultra-low range pressure and flow transmitter is designed to receive signals of space or duct
pressurization and reference pressures from static pressure sensors, or signals of total and static pressure from an
airflowstationortraverseprobe(s),and convert the sensed differential pressureintoa4-20mADCcurrentoutputsignal
proportionalandlinear to thestaticorvelocitypressure. TheVELTRONDPTis packagedinaNEMAType4Xenclosure
with industry-standard process connections, and is 2-wire loop powered. An optional integral LCD digital display
provideslocal indication of the measuredprocessinappropriateengineering units (i.e IN w.c.;CFM;lb/hr; %, etc.). A
pair of test terminals exist on the output terminal board that can be used for calibration and test purposes.
1.2 – THEORY OF OPERATION
Highandlow pressure signals generated by airflow stationsand probes,or staticpressure sensorsact uponopposite
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.
The resulting signal representing differential pressure or velocity pressure can be "manipulated": square rooted for
velocity or flow application; scaled for units of measure and area for process output; filtered and scaled for local data
display.
1
SECTION1 –GENERALINFORMATION

VELTRON DPT
Air Monitor Corporation
116-009-70.P65(09/18/09) VELTRONDPT-IO&MManual
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SECTION2 –PERFORMANCE SPECIFICATIONS
2 – PERFORMANCE SPECIFICATIONS
Mounting Position Effect. Zero shiftonly;corrected
throughtransmittermanualzeroing.
Span and Zero Adjustment. Via multi-turn
potentiometerslocatedinside the field wiring endcap.
Zero Elevation and Suppression. Maximum zero
elevation. 60%ofcalibratedspan.Requires an optional
bi-polartrans-ducer. Maximumzerosuppression.
100%ofcalibratedspan.
Low Pass Filter. Standard: 1.25 seconds to 98% Full
Span step. Adjustable: 0.25 to 10 seconds via
socketed resistor.
Overpressure and Static Pressure Limit. 25 psig.
Temperature Limits. –20 to 180ºF Storage; +32 to
140ºFOperating.
Humidity Limits. 0-95%RH,non-condensing.
2.1 – TRANSMITTER
Type. Differential Pressure
Ranges.Natural Full Span MinCalibrated Span
0 to 10.00 IN w.c. 0 to 4.00 IN w.c.
0 to 5.00 IN w.c. 0 to 2.00 IN w.c.
0 to 2.00 IN w.c. 0 to 0.80 IN w.c.
0 to 1.00 IN w.c. 0 to 0.40 IN w.c.
0 to 0.50 IN w.c. 0 to 0.20" IN w.c.
0 to 0.25 IN w.c. 0 to 0.10 IN w.c.
0 to 0.10 IN w.c. 0 to 0.04 IN w.c.
Accuracy. ±0.5% of Natural Full Span,includingnon-
linearity, hysteresis, deadband, and non-repeatability.
Stability. ±0.5% of Natural Full Span for six months.
Vibration Effect. ±0.05% of Natural Full Span/5G to 60
Hz.
Temperature Effect.
Zero. 0.015%of Natural Full Span/ºF.
Span. 0.015%ofNaturalFullSpan/ºF.
2.2 – INDICATION
Display. Optional3½ digit LCD.
2.3 – INPUT/OUTPUT
Input. Differentialpressure(highandlow).
Output. 4-20mADC.
2.4 – POWER
Power Supply. 14-40VDC. Twowirebasicconfiguration.
Circuit Protection. Powerinputis reverse polarity protected.

VELTRON DPT
Air Monitor Corporation
116-009-70.P65(09/18/09) VELTRONDPT-IO&MManual
3 – FEATURES
3.1 – ACCURACY
TheVELTRONDPTtransmitter is designed to maintain an accuracy of ±0.50% of Natural Full Span. Foraspanof 0 to
0.10 IN w.c., this accuracy is equivalent to an output accuracy of ±0.0005IN w.c. differential pressure or ±6.33 FPM
velocity.
3.2 – PRIMARY SIGNAL NOISE FILTER
Toeliminatebackground noiseandpulsationsfromtheflowsignal, theVELTRONDPTisequippedwithauserselectable
low pass filter.
3.3 – SQUARE ROOT FUNCTION (optional)
Whenequippedwith thesquarerootoption, theVELTRONDPTcan provideanoutputsignallineartovelocityorvolume.
3.4 – CONTINUOUS DISPLAY OF PROCESS (optional)
TheVELTRON DPT transmittercanbeoptionallyequippedwith a 3½-digitLCDdisplaytoprovidea continuous readout
of the measured process in engineering units (Inches w.c., SCFM, lbs/hr, etc.).
3.5 – HIGH TURNDOWN RATIO OPERATION
The VELTRON DPT transmitter, with its high level of accuracy, can maintain linear output signals on applications
requiringvelocityturndown of 5 to 1(equal toavelocitypressureturndownof25 to 1).
3.6 – HAZARDOUS LOCATIONS
TheVELTRON DPTtransmitterisFactoryMutualapprovedforthefollowing:
• Explosion Proof: Class 1, Division 1, Groups B, C, D.
• Dust Ignition Proof: Class II, III, Division 1, Groups E, F, G.
• Suitablefor indoor and outdoor NEMAType4X hazardouslocations.
3.7 – ENCLOSURE
TheVELTRONDPTtransmitterispackagedinaNEMAType4Xenclosurewith standardindustrialprocess connections.
3
SECTION 3 – FEATURES

VELTRON DPT
Air Monitor Corporation
116-009-70.P65(09/18/09) VELTRONDPT-IO&MManual
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4.1 – RECEIVING AND INSPECTION
• Carefully remove the VELTRON DPTfrom the shipping container and inspect for any damage. If any damage has
occurredin transit, contactfreight carrier.
• SavetheshippingcontainerforpossiblefutureuseinreturningtheVELTRON DPTtothe factory for recalibration.
• Included in the shipping container is a Mounting Bracket Kit consisting of: two-piece mounting bracket, U-bolt, and
necessaryhardware. Ifany items are missing, contactthe Customer Service Departmentat1-800-AIRFLOW.
• ReviewtheFactory Setup Information Sheet provided separatelyandverify the W.O. # and Serial #match thoseon
theVELTRONDPT. Verifythattheconfigurationrecorded on the FactorySet-UpInformationSheetiscorrectfor your
application. Ifnot,contactAir Monitor's Customer Service Department at 1-800-AIRFLOW for further guidance.
Note: The VELTRON DPT has been configured and calibrated to customer specified parameters (see "Factory
Setup Information Sheet", and requires no additional calibration/verification prior to installation.
4.2 – LOCATION
• The VELTRONDPTis housed inaNEMA Type4Xenclosure which issuitable for outdoor locations.
• TheVELTRONDPT is Factory Mutual approvedasexplosionproof for Class I,Division1,Group B, C, andD;dust-
ignitionproofforClass II/III, Division1,GroupsE, F, and Ghazardous(classified)location,indoorand outdoor(NEMA
Type4X).
• Theambient temperature of the selected mounting location must be between32º – 140ºF. Considerationshouldbe
given to units installed in enclosures exposed to direct sunlight.
• The VELTRON DPT may be mounted in any position or attitude and is not affected by any reasonable shock or
vibration.
4 – INSTALLATION
SECTION4 – INSTALLATION

VELTRON DPT
Air Monitor Corporation
116-009-70.P65(09/18/09) VELTRONDPT-IO&MManual
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SECTION4 – INSTALLATION
4.3 – MOUNTING
Althoughnotrequired,themostconvenientmethodformountingtheVELTRON DPTisutilizingthe included Mounting
Bracket Kit. Figure 4.1 shows how the various components are assembled, and Figure 4.2 depicts a variety of
mountingorientations.
Figure4.1
CAUTION
Do not rotate the electronics enclosure relative to the base. Internal signal tubing could
becometwistedorkinked,causingpossibletransduceroverpressurization,voidingwarranty.

VELTRON DPT
Air Monitor Corporation
116-009-70.P65(09/18/09) VELTRONDPT-IO&MManual
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SECTION4 – INSTALLATION
4.3 – MOUNTING (con't)
If using the Mounting Bracket Kit, Figure 4.2 depicts a variety of mounting orientations.
Figure4.2
CAUTION
VELTRON DPTshould not be mountedsolelyby the
processconnectionsor electrical conduit, which donot providesufficientsupport.