Air Monitor AUTO-purge III User manual

Installation, Operation,
and Maintenance Manual
AUTO-purge III
Panel
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
116-038-40.P65 (08/24/10)
AUTO-purge III - IO&M Manual
Precision Airflow Measurement
An ON
I CON Brand

AUTO-purgeIII
Air Monitor Corporation
116-038-40.P65(08/24/10) AUTO-purgeIII -IO&M Manual
TABLEOFCONTENTS
INSTRUMENTWARRANTY ...................................................................................................................... i
SECTION1 – GENERAL INFORMATION
1.1 DESCRIPTION ................................................................................................................................1
1.2 SEQUENCEOFOPERATION ......................................................................................................... 1
SECTION2 – FEATURES
2.1 CONSTRUCTION............................................................................................................................. 2
2.2 MULTIPLEOPERATINGPOWER OPTIONS ................................................................................... 2
2.3 ENCLOSUREHEATING .................................................................................................................. 2
SECTION 3 – INSTALLATION
3.1 RECEIVINGANDINSPECTION ....................................................................................................... 3
3.2 LOCATION ...................................................................................................................................... 3
3.3 MOUNTING ..................................................................................................................................... 4
3.4 PROCESSCONNECTIONS ......................................................................................................... 4-5
3.5 ACCUMULATORTANK ................................................................................................................... 5
3.6 ELECTRICALCONNECTIONS ........................................................................................................ 6
SECTION 4 – SET-UP
4.1 VERIFICATION OFPURGEPRESSURE ........................................................................................ 7
SECTION5 –OPERATION ...................................................................................................................... 8
SECTION6 – VERIFICATION OF PURGE PERFORMANCE ................................................................... 9
SECTION7– MAINTENANCE
7.1 INSPECTION................................................................................................................................. 10
SECTION8 – TROUBLE SHOOTING .....................................................................................................11
SECTION9 – CUSTOMER SERVICE
9.1 CUSTOMERSERVICE ................................................................................................................. 12
9.2 REPAIRS/RETURNS ..................................................................................................................... 12
9.3 WARRANTYREPAIR/RETURN ..................................................................................................... 12
9.4 NON-WARRANTYREPAIRS/RETURNS ....................................................................................... 12
9.5 FIELDSERVICE ........................................................................................................................... 12
TABLEOFCONTENTS

AUTO-purgeIII
Air Monitor Corporation
116-038-40.P65(08/24/10) AUTO-purgeIII -IO&M Manual
i
INSTRUMENT WARRANTY
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
solelylimitedto useas specifiedherein. Anyother useis strictly
prohibited without the prior written consent of Air Monitor
Corporation.
INSTRUMENTWARRANTY
AirMonitorCorporation(hereinafterreferredto as“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
listedunderthiswarranty whichisreturned freightprepaid
toSellerwithintwo(2) yearsafterstart-uportwenty-seven
(27) months after shipment, prove upon test and
examination by Seller to be defective within the terms of
this warranty. The warranty period for any item repaired
orreplacedshallbefor thetimeremainingon thewarranty
periodof theoriginal components. Purchasershall notify
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 equipmentmanufactured by 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. NordoesSellerwarrant
equipmentagainstnormaldeteriorationduetoenvironment;
noritems suchas lamps, glass,and similaritems subject
towear orburnout through 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.
Thewarrantysetforthaboveisinlieuofallotherwarranties
eitherexpress orimplied andconstitutes the fullextent of
Air Monitor Corporation’s liability to the customer, or any
otherpartyfor breachof warranty.
THEREARE NOEXPRESSWARRANTIESEXCEPTAS
SET FORTH HEREIN AND THERE ARE NO IMPLIED
WARRANTIES OF MERCHANTABILITY OF FITNESS
FOR ANY PARTICULAR PURPOSE, WHICH ARE
PARTICULARLYDISCLAIMED.

AUTO-purgeIII
Air Monitor Corporation
116-038-40.P65(08/24/10) AUTO-purgeIII -IO&M Manual
1 – GENERAL INFORMATION
1.1 – DESCRIPTION
Air Monitor'sAUTO-purge III is designed for applications where the presence of airborne particulate might impair the
measurement accuracy of Air Monitor's Combustion Air Station or VOLU-probe/SS array. When initiated by an Air
Monitor"smart" flow transmitter(such asthe VELTRONII, VEL-trol II,or MASS-tron II) theAUTO-purgeIII activates a
combination of fail-safe valves that route high pressure/high volume plant air to the flow measuring device for a short
duration, while simultaneously isolating the flow transmitter from overpressurization. This periodic purging assists in
maintaining the total and static sensing ports of the flow measuring devices in a clear, unobstructed condition.
1.2 – SEQUENCE OF OPERATION
Uponinitiationof anAUTO-purgecycle(viaexternalcommand), solenoidvalveson SV-1AandSV-1B willbeenergized,
allowing pilot air (AS-1) to shuttle SV-1Aand SV-1B, isolating the transmitter from the signal lines.
After three seconds, SV-2 will be energized, allowing high pressure purge air (AS-2) to flow to the total and static
sensingports of theflow measuring devices.
When the programming purge duration is complete, SV-2 is de-energized removing purge air. Aprogrammable after
purge duration allows for residual high pressure to bleed off before SV-1A and SV-1B shuttle back to re-connect the
transmitter to the signal lines.
1
SECTION1–GENERALINFORMATION

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Air Monitor Corporation
116-038-40.P65(08/24/10) AUTO-purgeIII -IO&M Manual
2 – FEATURES
2.1 – CONSTRUCTION
Brass and Copper.
–All wetted tubing, fittings,and are valves constructedof copper and/or brass.
– Enclosure is NEMA 4 painted steel.*
– External connection fittings are stainless steel FPT.
or
Stainless Steel.
–All wetted tubing, fittings, and valves are constructed of 316 stainless steel.
– Enclosure is NEMA 4 painted steel.*
– External connection fittings are stainless steel FPT.
*Stainlesssteel orfiberglass NEMA4Xenclosure optionally available.
2.2 – MULTIPLE OPERATING POWER OPTIONS
TheAUTO-purgeIIIpanelisavailable fromthe Factoryin 24VAC,24VDC,or 120VACoperatingpower.
Powerrequirements:
– 24VAC. 74VA(in rush), 62VA(continuous)
– 24VDC. 28W
– 120VAC. 77VA(inrush), 65VA(continuous)
2.3 – ENCLOSURE HEATING
Anoptional enclosureheater isavailable for theAUTO-purgeIIIpanel. Requires 120VAC(3.2 amps)power.
2
SECTION 2 – FEATURES

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3.1 – RECEIVING AND INSPECTION
• Carefully remove theAUTO-purge III Panel from its shipping container and inspect for any damage. If damaged,
contact freight company.
• VerifytheAUTO-purgeIII Panelis configured accordingto yourorder. Ifnot,contactAirMonitor's CustomerService
Departmentat1-800-AIRFLOW forfurtherguidance.
3.2 – LOCATION
• TheAUTO-purgeIII Panel is housedin a NEMA4enclosurewhich is suitableforoutdoor locations.
• The ambient temperature of the selected location must be between 32º – 120ºF, unless an appropriate means of
heatingor coolingare included.
• Theselected mountinglocation should berigid andfree of vibration.
• TheAUTO-purgeIIIPanelshould bemountedas closeaspossible toitsassociatedflow measuringstationorprobes.
In no case should the distance be greater than 50 feet. See Section 3.4 for appropriate line sizes.
Figure3.1
3 – INSTALLATION
SECTION3–INSTALLATION

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3.3 – MOUNTING
• TheAUTO-purgeIII Panel canbe mounted in anyposition provided it issecured by allfour mounting tabs.
• SecuretheAUTO-purgeIIIPanelutilizing appropriatehardware.
Figure3.2
3.4 – PROCESS CONNECTIONS
• Figure3.2 depictsthe variousbulkhead connections locatedon the bottomof theAUTO-purgeIII Panel.
• To bulkheadsA, B, D, and E install appropriate connection fittings according to Table 3.1 and 3.2.
• To bulkhead Cinstallappropriate connection fittingfor 1/2" orlarger pipe.
CAUTION
– Selectedconnection fittings must becompatiblewith the bulkheadfittings on theAUTO-purgeIIIPanel.
– Connectionfittings must beinstalled using appropriatethread lubricant/sealant.
– Wheninstalling or removingconnection fittings, a wrenchshould be usedon the bulkhead fittingto prevent turning.
SECTION3–INSTALLATION

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3.4 – PROCESS CONNECTIONS (con't)
Static and Total Pressure from Flow Station/Probe (Connection Code Aand B). For tubing sizes versus length,
seeTable 3.1below:
*Wall thickness no greater than 0.065".Table3.1
NOTE:Recommended Tubing Wall Thickness: .035” wall tubing is suitable for compression fittings. If socket weld
fittings are substituted, increase wall thickness to .065”.
Ator near theFlow Station/Probe,test tees shouldbe installed (seeFigure 3.1). On multiple probeassemblies, these
tees should be located in the interconnecting tubing, and as far away as possible from the incoming signal transport
lines. This test tee will be utilized in Section 4.
Static and Total Pressure from AUTO-purge Panel to Remote Flow Transmitter (Connection Code D and E).
For tubing sizes versus length, see Table 3.2 below:
Table3.2
Drip legs (see Figure 3.1) should be installed to preclude the migration of humidity/water into the flow transmitter.
The drip legs should be installed at the lowest point in the signal lines.
SupplyAir (Connection Code C). Air should be connected with a minimum of 1/2" Schedule 40 pipe. Supply air
must be supplied at 80 to 125 psig at 100 CFM, oil and dirt free.
Electrical Connections (Connections Code H and J). See Section 3.6.
3.5 – ACCUMULATOR TANK
Forthe optimum performance of theAUTO-purgeIII system, it is recommended thatan accumulator tankbe used as
a reservoir for purge air (see Figure 3.1). Table 3.3 lists recommended tank sizes.
Table3.3
The accumulator tank should be furnished with pressure regulator, coalescing filter, check valve, and pressure relief
valve.
SECTION3–INSTALLATION
Station or Probe Size
All CA Stations
VOLU-probeshaving combinedlength lessthan 10feet
VOLU-probeshavingcombined lengthgreater than10 feet
AccumulatorTank Size
120Gallons
80Gallons
120Gallon
Distancefrom PurgePanel
toFlow Transmitter
Under50feet
50 to 200 feet
Greaterthan 200feet
MinimumTube Size
1/4"
3/8"
1/2"
Distancefrom FlowMeasuring
Station orProbe toAUTO-purge III
Under25feet
25 to 50 feet
Greaterthan 50feet
Minimum Tube Size
1/2" O.D.*
3/4" O.D.*
1.0" O.D.*

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3.6 – ELECTRICAL CONNECTIONS
It is recommended that wiring be 14 to 22AWG.
AUTO-purge Start/Stop Command. Customeris toprovide poweredcontact closureofcorrect voltagefor durationof
purge cycle. This contact closure is typically provided by Air Monitor's VELTRON II, VEL-trol II, or MASS-tron II as
these"smart" transmitters allowAUTO-purgeprogramming. See Figure 3.3below for wiringdetails.
Figure3.3
Ifa VELTRONDPT-plus is usedin conjunction with theAUTO-purgeIIIpanel,a "smart" relay (R1)will be installedin
thepanel to performpurge management. See Figure3.4 below forwiring details.
Figure3.4
If means other than anAir Monitor "smart" transmitter is used to Start/Stop the purge cycle, the power provided must
match the coil voltage of SV-1A, SV-1B, and SV-2 (i.e., 24VDC, 24VAC, or 120VAC).
Optional Panel Heater (TB-2). Customer to provide 120VAC, 3.2 amps minimum.
Figure3.5
SECTION3–INSTALLATION

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ThisSection should beperformed only after installationhas been verifiedin accordance with Section3.
4.1 – VERIFICATION OF PURGE PRESSURE
1. Verify there is no purge start command from flow transmitter or DAS. (Refer to flow transmitter or DAS operating
instructions).
2. Opensupplyair valveHV-1 fully.
3. Verify air pressure as read on pressure gauge PI-1 is between 80 and 125 psig. If not, adjust supply air pressure
accordingly.
4. To the test tee installed on the total pressure sensing line at the flow measuring device (see Section 3.4), connect
a0-100 psigpressure gauge.
5. Initiate the AUTO-purge cycle (refer to flow transmitter or DAS operating instructions), observe and record the
pressure indicated on test gauge. Pressure should be at least 15 psig. If not, increase supply air pressure,
decreasesignal line lengthbetweenAUTO-purge panelandflow measuring device, orincrease signal linesize. If
initialpressure is atleast 15 psigbut dropssignificantly during theAUTO-purgecycle, increase the compressoror
accumulator tank capacity or reduce the purge duration (but not less than 30 seconds).
6. Repeat Steps 4 and 5 for the static pressure sensing line.
7. Retain the recorded pressures from Steps 5 and 6 as these will be a reference point for future tests.
8. Removegauge installedin Step 4 andseal tee.
4 – SET-UP
SECTION 4 – SET-UP

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Inorder for theAUTO-purgeIII panel tooperate, it mustreceive a startcommand(activation), consisting ofa powered
contact closure for the duration of the purge cycle.
AirMonitor's "smart" transmitters(VELTRONII, VEL-trol II,and MASS-tron II)are specifically designed tomanage an
AUTO-purge III panel. It is highly recommended that one of these transmitters be used. Purge cycle parameters
(frequency, duration,and after-purgeduration) areall set viatransmitter programming. See specificIO&M Manual for
details.
IfaVELTRONDPT-plusis usedinconjunction withtheAUTO-purgeIII panel,the"smart" relayinstalledinthe panelwill
be performing the purge management. The supplied "smart" relay operating instructions should be consulted when
verifying/changinganyof thepurge parameters.
Ifanother method ofactivation is utilized(such as amanual switch orBAS), user mustbe aware thatprocess signal to
transmitter or gauge will be lost during the duration of the purge cycle and complete signal recovery may take up to a
minuteafter theactivation signal isremoved.
Once Set-Up is complete per Section 4, theAUTO-purge III should continue to function without any further operator
interface.
CAUTION
IftheAUTO-purge IIIpanelis not goingto be utilizedimmediately or renderedinoperable forany
length of time, one of the following steps should be taken to preclude station or probe pluggage.
1. The airflow station or probe signal lines must be connected to a constant supply of 5 psig clean,
dry, oil-freeair.*
2. The airflow station or probe signal lines must be manually purged daily by applying 80 to 100 psig
clean, dry, oil-free air for at least 5 minutes to each port.*
*Removeor isolate signal linesto flow transmitter priorto applying any purgeair.
5 – OPERATION
SECTION5–OPERATION

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ThisSection details a methodof determining iftheAUTO-purgeIII panel is effectivelykeeping total andstatic sensing
portsfree fromclogging.
Atperiodic intervals,Steps4 through6 ofSection 4.1should beperformed. If eitherthe total orstaticpressure sensing
linesindicate anincrease inpressure (withoutany increasein supplyair pressure)of 10%or greaterthan theinitial test
pressure(recording duringSet-Up), cloggingcould beoccurring.
Probeshould beremoved, inspected,and cleanedif necessary. Afterprobeis reinstalled,Steps 4 through6 ofSection
4.1should beperformed andnew pressurereadings recorded.
To preclude reclogging,one or more of the following stepsshould be taken.
1. Increasepurgefrequency.
2. Increasepurgepressure.*
3. Increase compressor or accumulator tank capacity.
4. Increasepurgeduration.
*If pressure is increased, steps 4 through 6 of Section 4.1 must be performed to establish new test pressures for
comparison.
6 – VERIFICATION OF PURGE PERFORMANCE
SECTION6–VERIFICATIONOFPURGEPERFORMANCE

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TheAUTO-purgeIIIpaneldoesnotcontainanypartsrequiringspecialperiodicmaintenance. Thefollowingmaintenance
stepsare not requirementsbut guidelines forestablishing a maintenanceprogram.
7.1 – INSPECTION
– Verify that pressure gauge PI-1 is reading according to Section 4.
– Verify all tubing connections (inside and outside) are secure.
–Verify wiring terminationsare secureand corrosion free.
7 – MAINTENANCE
SECTION7–MAINTENANCE

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Air Monitor Corporation
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8 – TROUBLESHOOTING
SECTION 8 – TROUBLESHOOTING
Problem
AUTO-purge cycle does not
occur.
Solution
–Verify wiring is correct per Transmitter I,O&M Manual.
–Verify pressure at PI-1 is correct. See Section 4.1.
Ifafterfollowing theTroubleshooting stepstheAUTO-purgeIIIcontinues tooperate improperly,
contactthe Service Department forfurther assistance (seeSection 9).

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Air Monitor Corporation
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9 – CUSTOMER SERVICE
SECTION 9 – CUSTOMER SERVICE
9.1 – CUSTOMER SERVICE/TECHNICAL SUPPORT
AirMonitor Corporationprovides in-housetechnical support forour products:
Mondaythrough Friday
7 am to 5 pm (pst)
Phone:[phone]or1-800-AIRFLOW
Fax:[phone]
Additionally, on-site technical assistance is available. Before contacting the Customer Service Department, please
ensureany applicabletroubleshooting steps outlinedin Section8 have beenperformed.
9.2 – REPAIRS/RETURNS
If after contacting the Customer Service Department it is determined that equipment will require return toAir Monitor
Corporation for further repair, a ReturnAuthorization number will be issued by the Customer Service Department. A
Confirmationof ReturnAuthorizationwithshipping instructions willbe sent via facsimile.
Equipment to be returned toAir Monitor should be returned in its original shipping container if possible. If this is not
possible, ensure equipment is packaged sufficiently to protect it during shipment.
CAUTION
All damage occurring during transit is the Customer's responsibility.
List the Return Authorization (R/A) number on the packing list and clearly mark this number on the outside of each
shippingcontainer.
Costs associated with return of equipment to Air Monitor are the customer's responsibility regardless whether the
repair/returnisunder warranty.
9.3 – WARRANTY REPAIRS/RETURNS
Once the Customer Service Department determines that the equipment repair is under warranty, the item will be
repairedand returned tothe customer at nocharge.
9.4 – NON-WARRANTY REPAIRS/RETURNS
Customerwill beinvoiced forall parts andlabor requiredfor the repairof equipment. Returnshipping chargeswill also
beadded toinvoice.
9.5 – FIELD SERVICE
Requestsforfieldserviceshouldbe madetotheCustomerServiceDepartment, whowillcoordinatesendingatechnician
to customer's site. Phone:[phone]or1-800-AIRFLOW
Fax:[phone]
Uponcompletion ofwork, techniciancompletes aField ServiceReport and givesa copyto thecustomer. Fieldservice
is charged on a daily basis and all travel expenses are also added to customer's invoice.