Air Monitor AUTO-purge III User manual

Installation, Operation,
and Maintenance Manual
AUTO-purge III
with 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
116-048-40.P65 (8/24/10)
AUTO-purge III with Transmitter - IO&M Manual
Precision Airflow Measurement
An ON
I CON Brand

Air Monitor Corporation
116-048-40.P65 (8/24/10)
AUTO-purge III with Transmitter - IO&M Manual
TABLE OFCONTENTS
INSTRUMENTWARRANTY ...................................................................................................................... i
SECTION1 – GENERALINFORMATION
1.1 INTRODUCTION .............................................................................................................................. 1
1.2 DESCRIPTION ................................................................................................................................1
1.3 SEQUENCE OF OPERATION ......................................................................................................... 1
SECTION2 –FEATURES
2.1 CONSTRUCTION ............................................................................................................................. 2
2.2 MULTIPLE OPERATING POWER OPTIONS ................................................................................... 2
2.3 ENCLOSURE HEATING .................................................................................................................. 2
2.4 ENCLOSURE COOLING ................................................................................................................. 2
SECTION 3 – INSTALLATION
3.1 RECEIVING AND INSPECTION ....................................................................................................... 3
3.2 LOCATION ...................................................................................................................................... 3
3.3 MOUNTING ..................................................................................................................................... 4
3.4 PROCESS CONNECTIONS ......................................................................................................... 4-5
3.5 ACCUMULATOR TANK ................................................................................................................... 5
3.6 ELECTRICAL CONNECTIONS ........................................................................................................ 5
SECTION 4 – SET-UP
4.1 VERIFICATION OF PURGE PRESSURE ........................................................................................ 6
SECTION 5 – OPERATION ...................................................................................................................... 7
SECTION6 –VERIFICATIONOFPURGE PERFORMANCE ................................................................... 8
SECTION7 – MAINTENANCE
7.1 INSPECTION ................................................................................................................................... 9
SECTION8 –TROUBLE SHOOTING .................................................................................................... 10
SECTION9 –CUSTOMER SERVICE
9.1 CUSTOMER SERVICE .................................................................................................................. 11
9.2 REPAIRS/RETURNS ...................................................................................................................... 11
9.3 WARRANTY REPAIR/RETURN ...................................................................................................... 11
9.4 NON-WARRANTY REPAIRS/RETURNS ........................................................................................ 11
9.5 FIELD SERVICE ............................................................................................................................ 11
TABLE OF CONTENTS

Air Monitor Corporation
116-048-40.P65 (8/24/10)
AUTO-purge III with Transmitter - 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 solely limited to
use as specified herein. Any other use is strictly prohibited without
the prior written consent of Air Monitor Corporation.
INSTRUMENT WARRANTY
Air Monitor Corporation (hereinafter referred to 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.
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 two (2) years after start-up or twenty-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
or replaced shall be for the time remaining on the warranty
period of the original components. Purchaser shall notify
Seller in writing 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 deterioration due to environment;
nor items such as lamps, glass, and similar items subject
to wear or burnout through usage. Adjustments for items
or equipment not manufactured by Seller shall be made
to the extent of any warranty of the manufacturer or supplier
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.
The warranty set forth above is in lieu of all other warranties
either express or implied and constitutes the full extent 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
WARRANTIES OF MERCHANTABILITY OF FITNESS
FOR ANY PARTICULAR PURPOSE, WHICH ARE
PARTICULARLY DISCLAIMED.

Air Monitor Corporation
116-048-40.P65 (8/24/10)
AUTO-purge III with Transmitter - IO&M Manual
1 – GENERAL INFORMATION
1.1 – INTRODUCTION
This manual is for the purpose of explaining the AUTO-purge III portion of a system comprised of the AUTO-purge III and
an Air Monitor "smart" flow transmitter. This transmitter can be the VELTRON II, VEL-trol II, MASS-tron II, MASS-tron
II/CEM, or VELTRON DPT-plus, and its specific Installation, Operation & Maintenance Manual should be referenced for
all applicable operating information. 1.2 – DESCRIPTION
Air Monitor's AUTO-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 the Air
Monitor "smart" flow transmitter, the AUTO-purge III 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.
1.3 – SEQUENCE OF OPERATION
Upon initiation of an AUTO-purge cycle (via external command), solenoid valves on SV-1A and SV-1B will be energized,
allowing pilot air (AS-1) to shuttle SV-1A and 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 tot al and static
sensing ports of the flow measuring devices.
When the programming purge duration is complete, SV-2 is de-energized removing purge air. A programmable 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
SECTION 1 – GENERAL INFORMATION

Air Monitor Corporation
116-048-40.P65 (8/24/10)
AUTO-purge III with Transmitter - IO&M Manual
2 – FEATURES
2.1 – CONSTRUCTION
Brass and Copper.
– All wetted tubing, fittings, and valves are constructed of 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.
*Stainless steel or fiberglass NEMA 4X enclosure optionally available.
2.2 – MULTIPLE OPERATING POWER OPTIONS
The AUTO-purge III panel is available from the Factory in 24VAC, 24VDC, or 120VAC operating power requirements.
Power requirements:
– 24VAC. 85VA (in rush), 73VA (continuous)
– 24VDC. 37W
– 120VAC. 106VA (in rush), 92VA (continuous)
2.3 – ENCLOSURE HEATING
An optional enclosure heater is available for the AUTO-purge III panel. Requires 120VAC (3.2 amps) power.
2.4 – ENCLOSURE COOLING
An optional enclosure cooler is available for the AUTO-purge III panel. Requires 80-100 psig air supply.
2
SECTION 2 – FEATURES

Air Monitor Corporation
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3.1 – RECEIVING AND INSPECTION
• Carefully remove the AUTO-purge III Panel from its shipping container and inspect for any damage. If damaged,
contact freight company.
• Verify the AUTO-purge III Panel is configured according to your order. If not, contact Air Monitor's Customer Service
Department at 1-800-AIRFLOW for further guidance.
3.2 – LOCATION
• The AUTO-purge III Panel is housed in a NEMA 4 enclosure which is suitable for outdoor locations.
• The ambient temperature of the selected location must be between 40º – 120ºF, unless an appropriate means of
heating or cooling are included.
• The selected mounting location should be rigid and free of vibration.
• The AUTO-purge III Panel should be mounted as close as possible to its associated flow measuring station or probes.
In no case should the distance be greater than 50 feet. See Section 3.4 for appropriate line sizes.
Figure 3.1
3 – INSTALLATION
SECTION 3 – INSTALLATION

Air Monitor Corporation
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AUTO-purge III with Transmitter - IO&M Manual
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3.3 – MOUNTING
• The AUTO-purge III Panel can be mounted in any position provided it is secured by all four mounting tabs.
• Secure the AUTO-purge III Panel utilizing appropriate hardware.
Figure 3.2
3.4 – PROCESS CONNECTIONS
• Figure 3.2 depicts the various bulkhead connections located on the bottom of the AUTO-purge III Panel.
• To bulkheads A and B, install appropriate connection fittings according to Table 3.1.
• To bulkhead C install appropriate connection fitting for 1/2" or larger pipe.
CAUTION
– Selected connection fittings must be compatible with the bulkhead fittings on the AUTO-purge III Panel.
– Connection fittings must be installed using appropriate thread lubricant/sealant.
– When installing or removing connection fittings, a wrench should be used on the bulkhead fitting to prevent turning.
SECTION 3 – INSTALLATION

Air Monitor Corporation
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AUTO-purge III with Transmitter - IO&M Manual
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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,
see Table 3.1 below:
*Wall thickness no greater than 0.065".
Table 3.1
NOTE:Recommended Tubing Wall Thickness: .035” wall tubing is suitable for compression fittings. If socket weld
fittings are substituted, increase wall thickness to .065”.
At or near the Flow Station/Probe, test tees should be installed (see Figure 3.1). On multiple probe assemblies, 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.
Supply Air (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 (Connection Code H and J). See Section 3.6.
3.5 – ACCUMULATOR TANK
For the optimum performance of the AUTO-purge III system, it is recommended that an accumulator tank be used as
a reservoir for purge air (see Figure 3.1). Table 3.2 lists recommended tank sizes.
Table 3.2
The accumulator tank should be furnished with pressure regulator, coalescing filter, check valve, and pressure relief
valve.
3.6 – ELECTRICAL CONNECTIONS
It is recommended that wiring be 14 to 22 AWG.
Power wiring for the AUTO-purge III system is to be connected at TB-1 according to Figure 3.3.
Figure 3.3
SECTION 3 – INSTALLATION
Station or Probe Size
All CA Stations
VOLU-probes having combined
length less than 10 feet
VOLU-probes having combined
length greater than 10 feet
Accumulator Tank Size
120 Gallons
80 Gallons
120 Gallons
Distance from Flow Measuring
Station or Probe to CAMS
Under 25 feet
25 to 50 feet
Greater than 50 feet
Minimum Tube Size
1/2" O.D.*
3/4" O.D.*
1.0" O.D.*

Air Monitor Corporation
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This Section should be performed only after installation has been verified in accordance with Section 3.
4.1 – VERIFICATION OF PURGE PRESSURE
1. Verify there is no purge start command from "smart" transmitter. (Refer to transmitter operating instructions).
2. Open supply air valve HV-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
a 0-100 psig pressure gauge.
5. Initiate the AUTO-purge cycle (refer to transmitter operating instructions), observe and record the pressure indicated
on test gauge. Pressure should be at least 15 psig. If not, increase supply air pressure, decrease signal line length
between AUTO-purge panel and flow measuring device, or increase signal line size. If initial pressure is at least 15
psig but drops significantly during the AUTO-purge cycle, increase the compressor or 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. Remove gauge installed in Step 4 and seal tee.
4 – SET-UP
SECTION 4 – SET-UP

Air Monitor Corporation
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In order for the AUTO-purge III panel to operate, it must receive a start command (activation) from the "smart" transmitter.
Once Set-Up is complete per Section 4, the AUTO-purge III should continue to function without any further operator
interface.
Note: Power to either the AUTO-purge panel or "smart" transmitter should not be removed during a purge cycle to
avoid damage to transmitter.
5 – OPERATION
SECTION 5 – OPERATION
CAUTION
If the AUTO-purge III panel is not going to be utilized immediately or rendered inoperable for any
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-free air.*
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.*
*Remove or isolate signal lines to flow transmitter prior to applying any purge air.

Air Monitor Corporation
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This Section details a method of determining if the AUTO-purge III panel is effectively keeping total and static sensing
ports free from clogging.
At periodic intervals, Steps 4 through 6 of Section 4.1 should be performed. If either the total or static pressure sensing
lines indicate an increase in pressure (without any increase in supply air pressure) of 10% or greater than the initial test
pressure (recording during Set-Up), clogging could be occurring.
Probe should be removed, inspected, and cleaned if necessary. After probe is reinstalled, Steps 4 through 6 of Section
4.1 should be performed and new pressure readings recorded.
To preclude reclogging, one or more of the following steps should be taken.
1. Increase purge frequency.
2. Increase purge pressure.*
3. Increase compressor or accumulator tank capacity.
4. Increase purge duration.
*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
SECTION 6 – VERIFICATION OF PURGE PERFORMANCE

Air Monitor Corporation
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The AUTO-purge III panel does not contain any parts requiring special periodic maintenance. The following maintenance
steps are not requirements but guidelines for establishing a maintenance program.
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 terminations are secure and corrosion free.
7 – MAINTENANCE
SECTION 7 – MAINTENANCE

Air Monitor Corporation
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AUTO-purge III with Transmitter - IO&M Manual
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8 – TROUBLESHOOTING
SECTION 8 – TROUBLESHOOTING
If after following the Troubleshooting steps the AUTO-purge III continues to operate improperly,
contact the Service Department for further assistance (see Section 9).
Problem
AUTO-purge cycle does not
occur.
Solution
– Verify wiring is correct per Transmitter IO&M Manual.
– Verify pressure at PI-1 is correct. See Section 4.1.

Air Monitor Corporation
116-048-40.P65 (8/24/10)
AUTO-purge III with Transmitter - IO&M Manual
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9 – CUSTOMER SERVICE
SECTION 9 – CUSTOMER SERVICE
9.1 – CUSTOMER SERVICE/TECHNICAL SUPPORT
Air Monitor Corporation provides in-house technical support for our products:
Monday through Friday
7 am to 5 pm (pst)
Phone: [phone] or 1-800-AIRFLOW
Fax: [phone]
Additionally, on-site technical assistance is available. Before contacting the Customer Service Department, please
ensure any applicable troubleshooting steps outlined in Section 8 have been performed.
9.2 – REPAIRS/RETURNS
If after contacting the Customer Service Department it is determined that equipment will require return to Air Monitor
Corporation for further repair, a Return Authorization number will be issued by the Customer Service Department. A
Confirmation of Return Authorization with shipping instructions will be sent via facsimile or e-mail. This document
MUST accompany returned item.
Equipment to be returned to Air 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
shipping container.
Costs associated with return of equipment to Air Monitor are the customer's responsibility regardless whether the
repair/return is under warranty.
9.3 – WARRANTY REPAIRS/RETURNS
Once the Customer Service Dep artment determines that the equipment rep air is under warranty , the item will be
repaired or replaced and returned to the customer at no charge.
9.4 – NON-WARRANTY REPAIRS/RETURNS
Customer will be invoiced for all parts and labor required for the repair of equipment. Return shipping charges will also
be added to invoice. 9.5 – FIELD SERVICE
Requests for field service should be made to the Customer Service Department, who will coordinate sending a technician
to customer's site.
Phone: [phone] or 1-800-AIRFLOW
Fax: [phone]
Upon completion of work, technician completes a Field Service Report and gives a copy to the customer. Field service
is charged on a daily basis and all travel expenses are also added to customer's invoice.