Air Monitor VELTRON II User manual

Installation, Operation,
and Maintenance Manual
VELTRON II
MicroprocessorBased
Pressure& Flow"Smart" Transmitter
Versions5.3X
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
116-011-98.P65 (8/30/10) VELTRONII-IO&MManual

VELTRON II
Air Monitor Corporation
116-011-98.P65 (8/30/10) VELTRONII-IO&MManual
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 OPERATOR SETUPMENU ............................................................................................................ 3
3.2 TRANSMITTERHOLD ..................................................................................................................... 3
3.3 AUTOMATICZEROING ................................................................................................................... 3
3.4 AUTO-purgeMANAGEMENT(option).............................................................................................. 3
3.5 ALARM(option)............................................................................................................................... 4
3.6 SPECIALFUNCTIONS(option) ....................................................................................................... 4
3.7 DATADISPLAY ............................................................................................................................... 5
3.8 K-FACTOR ...................................................................................................................................... 5
3.9 FLOW/DIFFERENTIALPRESSURECALCULATOR ........................................................................ 5
3.10 NETWORK...................................................................................................................................... 5
3.11 MULTIPLE OPERATING POWERSELECTIONS ............................................................................. 5
3.12 ENCLOSURE .................................................................................................................................. 5
SECTION 4 – INSTALLATION
4.1 RECEIVINGAND INSPECTION ....................................................................................................... 6
4.2 LOCATION ...................................................................................................................................... 6
4.3 MOUNTING ..................................................................................................................................... 6
4.4 PROCESSCONNECTIONS ............................................................................................................ 7
4.5 POWER/SIGNALCONNECTIONS ............................................................................................... 8-9
4.6 INPUT/OUTPUTSELECTION ........................................................................................................ 10
4.7 DISPLAYCONTRASTADJUSTMENT............................................................................................ 10
SECTION5 – OPERATION
5.1 INTRODUCTION .............................................................................................................................11
5.2 START-UP ......................................................................................................................................11
5.3 NORMALOPERATION.................................................................................................................. 12
5.4 CONFIGURATION ......................................................................................................................... 13
5.5 PUSHBUTTONDEFINITION .......................................................................................................... 14
5.6 CONFIGURATIONPROGRAMMING..........................................................................................15-17
5.7 OPERATORPASSWORDSELECTION ........................................................................................ 18
5.8 TRANSMITTERSCALING&CONFIGURATION .........................................................................19-26
5.9 LOW PASSFILTER SELECTION .................................................................................................. 27
5.10 AUTO-zeroCONFIGURATION ....................................................................................................... 28
5.11 AUTO-purgeCONFIGURATION ..................................................................................................... 29
5.12 AUTO-calibrationCONFIGURATION .............................................................................................. 30
5.13 ALARMCONFIGURATION ........................................................................................................31-32
TABLEOFCONTENTS

VELTRON II
TABLEOF CONTENTS
SECTION5 –OPERATION (con't)
5.14 CONTROLLERCONFIGURATION ................................................................................................. 32
5.15 SPECIALFUNCTIONCONFIGURATION ...................................................................................33-34
5.16 K-FACTORCONFIGURATION ...................................................................................................35-36
5.17 STANDARDDISPLAYCONFIGURATION ..................................................................................37-39
5.18 ENHANCEDDISPLAYCONFIGURATION..................................................................................40-44
5.19 ANALOGOUTPUTCONFIGURATION ........................................................................................... 45
5.20 TRANSDUCERSPANSELECTION ............................................................................................... 46
5.21 TRANSMITTERINPUTCALIBRATION ........................................................................................... 47
5.22 TRANSMITTEROUTPUTCALIBRATION ....................................................................................... 47
5.23 POWERSUPPLYCALIBRATION.................................................................................................. 48
5.24 TRANSDUCERCHARACTERIZATIONSELECTION....................................................................... 49
5.25 NETWORKCONFIGURATION....................................................................................................... 50
5.26 MENUINACTIVITYTIMEOUTSELECTION ................................................................................... 51
SECTION6 – CALIBRATION
6.1 REQUIREDEQUIPMENT .............................................................................................................. 52
6.2 PREPARATION ............................................................................................................................. 52
6.3 TRANSMITTERINPUTCALIBRATION .......................................................................................53-58
6.4 TRANSMITTEROUTPUTCALIBRATION ...................................................................................59-60
SECTION7– MAINTENANCE ............................................................................................................... 61
SECTION8 – TROUBLESHOOTING .................................................................................................62-63
SECTION 9 – PARTS LIST................................................................................................................64-65
SECTION10 – CUSTOMER SERVICE .................................................................................................. 66
TABLEOFCONTENTS
Air Monitor Corporation
116-011-98.P65 (8/30/10) VELTRONII-IO&MManual

VELTRON II
Air Monitor Corporation
116-011-98.P65 (8/30/10) VELTRONII-IO&MManual
i
INSTRUMENT WARRANTY
AirMonitorCorporation (hereinafterreferred toas “Seller”)warrants thatatthetimeof shipment,products soldpursuant
tothis contract willbe free from defectsin materials and workmanship,and will conform tothe specifications furnished
or approved in writing by Seller. No warranty is given that 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 listed under this warranty which is returned freight prepaid to
Seller within the earlier of three (3) years after start-up or thirty-nine (39) months after shipment that, upon test and
examination,proves defective within thetermsof this warranty. The warranty period for anyitem repaired orreplaced
shallbefor thetime remainingon thewarranty periodof theoriginal components. Purchasershall notifySellerinwriting
of such defect within sixty (60) days of 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 interconnection with equipment manufactured by others, improper installation or
storage, or used in violation of instructions furnished by Seller, nor does it extend to any product which has been
repaired or altered by persons not expressly approved by Seller. Nor does Seller warrant equipment against normal
deteriorationdue toenvironment; nor items suchas lamps, glass,and similaritems subject towear or burnoutthrough
usage. Adjustmentsfor items orequipment not manufactured by Sellershall be made to the extentof any warranty of
themanufacturer orsupplier thereof.
Seller shall not be liable for any special or consequential damages or for loss of damage, directly or indirectly arising
from the use of the products. Seller's warranty shall be limited to replacement of defective equipment and shall not
includefield removal andinstallation expenses.
Thewarranty set forth above is inlieu of all other warranties eitherexpress or implied and constitutes the fullextent of
Air Monitor Corporation’s liability to the customer, or any other party for breach of warranty.
THERE ARE NO EXPRESS WARRANTIES EXCEPT AS SET FORTH HEREIN AND THERE ARE NO IMPLIED
WARRANTIESOFMERCHANTABILITYOFFITNESSFORANYPARTICULARPURPOSE,WHICHAREPARTICULARLY
DISCLAIMED.
NOTICEOF PROPRIETARYRIGHTS
This document contains confidential technical data, including
trade secrets and proprietary information which are the sole
property of Air Monitor Corporation. The use of said data is
solelylimitedtouseasspecifiedherein. Any otheruse isstrictly
prohibited without the prior written consent of Air Monitor
Corporation.
INSTRUMENTWARRANTY

VELTRON II
Air Monitor Corporation
116-011-98.P65 (8/30/10) VELTRONII-IO&MManual
1 – GENERAL INFORMATION
1.1 – DESCRIPTION
TheVELTRONII isanultra-low differentialpressure"smart" transmitterdesignedto convertthelow magnitudepressure
signals generated by airflow stations and probes, or static pressure sensors into dual transmitter output signals (4-
20mA,0-5VDC or 0-10VDC)linear to pressureor flow.
EachVELTRON IIis equippedwith numerousstandardfeatures: Amulti-lineLCDusedduringconfiguration/calibration
andfordisplay ofprocess;AUTO-zeroforeliminationoftransmitterzero error;user selectableprimarysignalnoisefilter,
inputpowerisolation;capabilityof10:1flowor100:1pressureturndown;NEMA1enclosure,andalonglist ofconstruction
options. 1.2 – THEORY OF OPERATION
Highand low pressure signalsgeneratedby airflow stations andprobes,or static pressure sensorsactupon 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 resulting digitalsignal representingdifferentialpressureor velocity pressurecan
be"manipulated" within themicroprocessor: square rooted forvelocityor flow application;scaled for unitsofmeasure
andareaforprocessoutputs;filteredandscaledforlocaldatadisplayandutilizedinperforminga SpecialFunction (see
Section 3 – Features). 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, digital
input (contact closure) detection, output relay operation, automatic zeroing valve operation, Operator Setup menu
system,display (LCD) indication, and individualLED indication.
1
SECTION1–GENERALINFORMATION

VELTRON II
Air Monitor Corporation
116-011-98.P65 (8/30/10) VELTRONII-IO&MManual
2
2 – PERFORMANCE SPECIFICATIONS
2.2 – INDICATION
Displays. Standard2line x 20 characterLCD provides
two lines of data display. Optional backlit, graphical
LCD provides up to 5 lines of data display.
LED'sindicate CPU activated,AUTO-zeroinprogress,
AUTO-zeroover-ranged,AUTO-purgeinprogress,and
auxiliary alarm "on" status.
2.3 – INPUTS/OUTPUTS
Analog Inputs. Asingle input is field configurable via
jumperfor 0-5VDC, 0-10VDC,or 4-20mADC. For use
withoptional special function.
Analog Outputs.Dual transmitter outputs are
individuallyconfigurablevia jumperfor 0-5VDC,0-
10VDC,or 4-20mADC. Twoadditionaloutputs are
optionallyavailable.
Digital Inputs. DrycontactsforAUTO-purge external
start,and purge interrupt.
Digital Outputs. Dry contacts for optionalAlarm or
AUTO-purgeactivation/acknowledgment.Contacts are
ratedfor: Maximum 3 amps @ 24 to 120VAC
Maximum 3 amps @ 24VDC
Maximum0.5amp@48VDC
Network Communication. Optional ModBus TCP/IP
overEthernet.
2.4 – POWER
Power Supply. Standard24VAC or 24VDC. Optional
120VACvia externaltransformer.
Power Consumption.
Circuit Protection. Power input is isolated, fused, and
reversepolarityprotected.
2.1 – TRANSMITTER
Ranges.Natural Spans Bi-Polar Natural Spans
0to25.00IN w.c.
0to10.00IN w.c. –10.00to+10.00 INw.c.
0to 5.00IN w.c. – 5.00to +5.00IN w.c.
0to 2.00IN w.c. – 2.00to +2.00IN w.c.
0to 1.00IN w.c. – 1.00to +1.00IN w.c.
0to 0.50IN w.c. – 0.50to +0.50IN w.c.
0to 0.25IN w.c. – 0.25to +0.25IN w.c.
0to 0.10IN w.c. – 0.10to +0.10IN w.c.
0to 0.05IN w.c. – 0.05to +0.05IN w.c.
Span Rangeability. The calibrated span can be down
rangedto 40% of the NaturalSpan.
Accuracy. 0.1% ofNatural Span,including non-
linearity, hysteresis, deadband,and non-repeatability.
Stability. ±0.5% of Natural Span for six months.
Transducer Response Time. 0.5 second to reach
98% of a step change.
Temperature Effect.
Zero. None;corrected byAUTO-zero.
Span. 0.015% of Full Span/ºF.
Mounting Position Effect. None;corrected byAUTO-
zero.
Span and Zero Adjustment. Digital, via internally
locatedpush-buttons.
Automatic Zeroing.
Accuracy. Within 0.1% of calibrated span.
Frequency. Every 1 to 24 hours on 1 hour intervals.
Low Pass Filtration. Responsetime to reach98% of a
step change is adjustable from 2.0 to 256.0 seconds.
MaxZeroElevationandSuppression. 100%ofNatural
Span.
Overpressure and Static Pressure Limit. 25 psig.
Temperature Limits. –20to180ºFStorage;+40to140ºF
Operating.
Humidity Limits. 0-95%RH, non-condensing.
SECTION2–PERFORMANCESPECIFICATIONS
24VAC
24VDC
120VAC
14.4VA
9.6W
19.2VA
14VA
9.0W
18.67VA
85VA
37W
106VA
73VA
37W
92VA
Standard w/AUTO-purge
In Rush Contin In Rush Contin

VELTRON II
Air Monitor Corporation
116-011-98.P65 (8/30/10) VELTRONII-IO&MManual
3 – FEATURES
3.1 – OPERATOR SETUP MENU
The microprocessor program contains a Operator Setup menu system for setting user selectable parameters. Four
pushbuttons,ESC, UP, DN, ENT allow the useraccess to the menufor setting configurationmodesand values. Refer
tothe ConfigurationProgramming (Section5.6) instructionsfor operationdetails. AlsocontainedintheOperatorSetup
menuisallinputandoutputcalibration. Thecalibrationmethodiscompletelydigitalandcontainsnoanalogpotentiometer
adjustmentswhich aresusceptible todrift. Non-volatile memoryis usedforstoring allsetup parametersand calibration
values,and will remain unchangedafterset, even when powerto the unit is off.
3.2 – TRANSMITTER HOLD
Certain operations performed by the microprocessor place the unit into a Hold mode. This occurs when the Operator
Setup menu system is activated, when an AUTO-zero is performed, or when an AUTO-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
operationis indicated bythe "CPUActive" LED flashing ata rate offour times per second. AHold modeis indicated by
the "CPUActive" LED flashing at a rate of one time per second.
3.3 –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
signalismeasuredand storedinmemory; thevalveis deactivatedandafter abriefperiod forprocesssignal stabilization,
theHold isreleased andNormal processmeasurement resumes. DuringNormal operation,the zerooffset valuestored
inmemory is subtracted from subsequenttransducerreadings until the nextAUTO-zerocycleoccurs and repeatsthe
process. AUTO-zeroOn/Off andInterval areavailable and configurableusing theOperator Setup menu.
3.4 –AUTO-purge MANAGEMENT (option)
For"dirtyprocess air"applicationsrequiring theuse ofanAir MonitorAUTO-purgesystem,theVELTRONIIprovides the
capabilitiesof establishing purge frequency and duration, while also giving the user a choice of either internally timed
cyclefrequency orexternally triggered purgeinitiation. During the purgecycle alltransmitter outputs aremaintained at
their last value prior to the start of the purge cycle.
3
SECTION 3 – FEATURES

VELTRON II
Air Monitor Corporation
116-011-98.P65 (8/30/10) VELTRONII-IO&MManual
4
3.5 –ALARM (option)
The VELTRON IIAlarm Option provides the means for having the process signal compared to user selectable alarm
points and automatically activates a form C relay to generate dry contact alarm signal(s). User selectable alarm
configurationsof Low/High,Low1/Low2, and High1/High2plusAlarmsOn/Off,Setpoints,DeadBands,and Delays are
configurable via the OperatorSetup menu. AlarmSetpointscan be displayed onan Enhanced Display during Normal
operatingmode.
Onechoice amongthree alarmtypes areavailable to theuser: 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. The "AuxiliaryAlarm On" LED will light whenever any alarm relay is activated. Alarm On/Off,
Type, Setpoints, Deadbands, and Delays are available and configurable using the Operator Setup menu. TheAlarm
Setpoints can be displayedon the Enhanced Display during Normal operation.
HighAlarm Process Signal High2Alarm
Point Point
Process Signal Low1 Alarm High1Alarm
Point Point
Low Alarm Low2 Alarm Process
Point Point Signal
Low/High Alarm Low1/Low2 Alarm High1/High2 Alarm
3.6 – SPECIAL FUNCTIONS (option)
Whenused inconjunction withan externalinput(second transmitter)applied tothe specialfunctioninput terminals,the
VELTRONII can performone ofthe Special Functionslisted below. Withinthe OperatorSetup menu,both the external
inputand the internal transmitter signalscan be individually scaled toachieve a correct weighted basis. Theresulting
SpecialFunctionoutputisavailableasan analogoutput and/orfor thedisplay onthe optionalEnhanced Display. When
%Deviation is selected as SpecialFunctionType, contactclosureis available for alarm/notification. SpecialFunction
ON/OFFandTypeareavailableand configurableusing the OperatorSetup menu.
%Deviation. |EXTERNAL–INTERNAL|/|EXTERNAL|. ThisfunctionhasAlarm Setpoint,Deadband, andDelay that
areconfigurable via theOperator Setup menu. (Ifthis function isselected,AlarmOption,Section 3.5, isnot available.)
Summed Flow. INTERNAL+EXTERNAL
Averaged Flow. (EXTERNAL + INTERNAL) / 2
Delta Flow, Internal - External. INTERNAL – EXTERNAL
Delta Flow, External - Internal. EXTERNAL – INTERNAL
Low Select. Selecting the lesser of the INTERNAL and EXTERNAL signals.
High Select. Selectingthe greater of the INTERNALandEXTERNAL signals.
SECTION 3 – FEATURES

VELTRON II
Air Monitor Corporation
116-011-98.P65 (8/30/10) VELTRONII-IO&MManual
3.7 – DATA DISPLAY
The Standard Display is a 2 line by 20 character Liquid Crystal Display (LCD) capable of displaying the transmitter
signal in engineering units (such as IN w.c., FPM, CFM) and a user selectable second line of data when in Normal
operation. It is also utilized by the Operator Setup menu for displaying the menu parameters and values.
Theoptional EnhancedDisplay isa backlitgraphical LCDand replacesthe StandardDisplay. Itis capableofdisplaying
the transmitter signals in Engineering units plus other signals that become available when theAlarm and/or Special
Function options described in Sections 3.5 and 3.6 are implemented. It can also display a user settable I.D. number
using any combination of standardASCII characters. It is also used by the Operator Setup menu for displaying the
menuparametersandvalues. Configuring theEnhancedDisplay forNormal operationisdone usingtheOperator Setup
menu.
3.8 – K-FACTOR
TheVELTRON IIis equippedwith aK-factor featurewhich allowsfor theintroduction ofa biasand/or gainfactor intothe
transmitter's flow calculations. The K-factor feature is intended to be used in two types of applications:
1. Toadjust forflow measurementerror asa resultof highlydistorted airflowinduced byupstreamor downstreamflow
disturbances.
2. To adjust the transmitter's output to bring it into close correlation with field measured flow data.
TheK-Factor gain and bias values canbe entered directly or the VELTRON II can calculate thesevalues based on
measuredand referencevalues from a1 or3 point airflowtraverse.
3.9 – FLOW/DIFFERENTIAL PRESSURE CALCULATOR
TheVELTRON II is equippedwithan integral calculator featurethat allows the userto determine the maximumflow or
differentialpressure from theappropriate variables. This featureallows the user todetermine input oroutput values at
variouspoints ofthe process or newvalues if the processparameters havechanged. Also, the calculator canbe used
toimplement a single-pointdensity compensation for operatingtemperature and/or absolute pressure.
3.10 – NETWORK (option)
TheVELTRONII canbe provided withoptional ModBusTCP/IPover Ethernetfor serial datacommunication.
3.11 – MULTIPLE OPERATING POWER SELECTIONS
TheVELTRON II canbe powered by24VACor 24VDC.
3.12 – ENCLOSURE
TheVELTRONII transmitterisfurnished in aNEMA1 aluminum enclosure withexternal, unitaryplug in terminal strips
foreaseofinstallationandremoval. An optionaljunctionboxisavailableforapplications requiringenclosed fieldwiring.
5
SECTION 3 – FEATURES