Welch 2511B-75 User manual

OWNER’S MANUAL
FOR
ASPIRATION / FILTRATION
VACUUM SYSTEM
MODEL:
2511
Welch-Ilmvac
5621 W. Howard Street
Niles, IL 60714
Phone: [phone] (Technical Support)
Fax: [phone]
E-Mail: [e-mail]
Web-Page: www.welchvacuum.com
Warning
Not recommended for pumping acid,
base or organic vapors or gases.
Models 2511B-75 / 2511C-75 / 2511C-76 / 2511C-77
For outside of U.S. and Canada, contact your local
Gardner Denver sales office, see back page
WELCH-ILMVAC
Part No. 642781 0510
Printed in USA

INSTRUCTION
WARNING AND CAUTION
PLEASE READ BEFORE OPERATION
While reading your manual, please pay close attention to areas labeled:
WARNING AND CAUTION.
The description of each is found below.
WARNING
Warnings are given where failure to observe instruction could result
in injury or death to people.
CAUTION
Cautions are found where failure to observe the instruction could result
in damage to the equipment, associated equipment and process.
These units confirm to the SI International system of units of measurement.
The following symbols (with recommendation of IEC1010 ) of warning will be found on the pump.
Caution - refer to accompanying documents
Caution - risk of electrical shock
Caution - hot surface
Double Insulated
OFF (Power)
ON (Power)
WARNING
Motor includes a self resetting thermal cutout and the pump could
restart without actuation under fault condition.
2

TABLE OF CONTENTS
Section 01 - SAFETY INFORMATION
1.10 Caution To Prevent Injury
1.20 Caution To Reduce Risk Of Electrical Shock
1.30 Warning To Reduce Risk Of Electrocution
1.40 Danger To Reduce Risk Of Explosion Or Fire
Section 02 - INSTALLATION
2.10 Introduction
2.20 Unpacking
2.30 Pump Mounting
2.40 Pump Location
2.50 Intake And Discharge Provision
2.60 Electrical Power
2.70 Vacuum Connection
2.80 Vacuum Gauges
2.90 Traps
Section 03 - OPERATION
3.10 Starting Procedures
3.20 Leak Detection
3.30 Operating Pressure Range
3.40 Shutdown Procedures
Section 04 - MAINTENANCE
4.10 Maintenance Procedures
Section 05 - TROUBLESHOOTING
5.10 Vacuum Problems
5.20 Pressure Problems
5.30 Trouble Shooting Guide For 2511 And 2515
Section 06 - SPECIFICATION
6.10 Specification Table
Section 07 - WARRANTY
Section 08 - EXPLODED VIEWS AND PARTS LIST
8.10 Exploded ViewAnd Parts List For 2511B-75 / 2511C-75 / 2511C-76
8.11 Exploded ViewAnd Parts List For 1475K-20
Section 09 - KITS AND ACCESSORIES
3

SECTION 1: SAFETY INFORMATION
1.10 Caution: To Prevent Injury...
1.11 Never operate this product if it has a damaged cord or plug. If it is not working properly, has been
dropped, damaged or has fallen into water, please return the product to a Welch service center for
examination and repair.
1.12 Keep the cord away from heated surfaces. All electrical products generate heat. To avoid serious burns
never touch unit during or immediately after operation.
1.13 Never block any air openings or place it on a soft surface where the openings may be blocked. The air
openings are for ventilation of the motor inside the housing. Keep all air openings free of lint, dirt and
other foreign objects.
1.14 Model 2511 is thermally protected and can automatically restart when the protector resets. Always
disconnect power source before servicing.
1.15 Never drop or insert fingers or any other object into any openings.
1.16 Do not operate this product where oxygen is being administered.
1.17 Wear safety glasses and goggles when operating this product. Never point any air nozzle or air sprayer
toward another person or any part of the body.
1.18 Use only in well ventilated areas.
1.19 Do not use any tools or attachments without first determining maximum air pressure for that tool
or attachment. Be sure to properly identify intake and discharge before using pump. See Section 2.50.
CAUTION
Do not fill the collection jar above the safe fill level line
indicated on the jar.
1.20 Caution: To Reduce Risk Of Electrical Shock...
1.21 Do not disassemble. Disassembly or attempted repairs if accomplished incorrectly can create electrical
shock hazard. Refer servicing to qualified service agencies only.
1.22 115V unit is supplied with a three pronged plug. Be sure to connect pump to a properly grounded outlet
only.
1.30 Warning: To Reduce Risk Of Electrocution...
1.31 Do not use this product in or near area where it can fall or be pulled into water or other liquids.
1.32 Do not reach for this product if it has fallen into liquid. Unplug immediately.
1.33 Never operate this product outdoors in the rain or in a wet area.
1.40 Danger: To Reduce Risk Of Explosion or Fire...
1.41 Do not use this pump in or near explosive atmospheres or where aerosol (spray) products are being
used.
1.42 Do not pump anything other than atmospheric air.
1.43 Do not pump combustible liquids or vapors with this product or use in or near an area where flammable
or explosive liquids or vapors may exist.
1.44 Do not use this product near flames.
WARNING
Failure to observe the above safety precautions could result
in severe bodily injury, including death in extreme cases.
4

SECTION 2: INSTALLATION
2.10 Introduction
2.11 This manual has been compiled not only for the care and maintenance of the Welch Aspiration/Filtration
Vacuum System now in your possession, but as a helpful reference and guide to prevent many problems
which may occur if used improperly.
2.20 Unpacking
2.21 Carefully remove the Aspiration/Filtration Vacuum System from the shipping case. Preserve all
paperwork for future reference. If damage has occurred from shipment a claim must be filed with the
carrier immediately; preserve the shipping carton for inspection by the carrier. If you are required to
communicate with your dealer or Welch Vacuum, be sure to include your order numbers for quick
identification. Do not return the pump to the factory without filling in the online form for a returned goods
number.
2.30 Pump Mounting
2.31 Rubber feet are attached to the pump. Rubber feet are excellent for applications involving a semi-flexible
surface such as a bench top; they help to isolate noise and eliminate creeping. AllAspiration/Filtration
Vacuum Systems should be mounted on a horizontal plane.
2.40 Pump Location
2.41 The Aspiration/Filtration Vacuum System should be located preferably in a clean, dry, and well ventilated
area. Please be sure not to block the ventilation holes located on the motor housing. The system should
be placed where the surrounding temperature remains between 10°C and 40°C (50°F and 104°F).
Always check to insure the location chosen is protected from direct or indirect moisture contact.
5
WARNING
Themotor isthermally protectedandwillautomaticallyrestartunexpectedly
whentheoverloaddeviceresets. Don’tpumpflammable orexplosivegases
or vapors or operate this pump in an atmosphere containing flammable or
explosive gases or vapors.

2.50 Intake And Discharge Provision
2.51 The vacuum regulator and vacuum dial gauge enable control of fluid aspiration into to the collection jar.
The vacuum regulator allows the vacuum level to be set between roughly a atmospheric pressure and the
maximum vacuum allowed for the pump model. A float valve on the collection jar and, hydrophobic filter
keep water from accidentally being drawn into the unit. The regulator allows discharge pressure to be
set between atmospheric and the maximum possible for the pump model. Model 2511 is equipped with a
pressure port.
Note: Adjusting the vacuum regulators will affect the performance of the pump.
Please contact Welch technical service prior to start up at 847-676-8800 if you have any questions.
IntakePressure / Exhaust
Vacuum GaugeVacuum Regulator
WARNING
Never block the discharge port. If the exhaust is blocked, pressure
will build-up in the pump above its rated operating pressure.
6
Models 2511B-75 / 2511C-75 / 2511C-76 / 2511C-77

2.60 Electrical Power
2.61 Power Source Review
Review the power source and the motor rating to be sure they agree in voltage, phase, and frequency.
Serious damage may occur to the motor if it is connected to an improper voltage. All Welch pumps must
be grounded. Grounding reduces the risk of electric shock in the event of an electrical short circuit. The
plug must be plugged into a properly grounded outlet. Consult your local electrical codes if you have
doubts.
2.62 Servicing of Double-Insulated Product
In a double-insulated product, two systems of insulation are provided instead of grounding. No grounding
means is provided on a double-insulated product, nor should a means for grounding to be added to the
product. Servicing of a double-insulated product requires extreme care and knowledge of the system and
should be done only by qualified service personnel. Replacement parts for the double-insulated product
must be identical to those parts in the product.
2.63 Classification And Symbol Glossary
Double Insulated
OFF (Power)
ON (Power)
2.70 Vacuum Connection
2.71 For best results, Welch recommends the length of the tubing between the pump and the chamber be kept
as small as possible.
2.80 Vacuum Gauges
2.81 All Aspiration/Filtration Vacuum Systems come with dial vacuum gauges. The vacuum gauge gives
negative pressure - That is pressure below atmospheric. The reference point for the gauge is
atmospheric pressure.
2.90 Traps
2.91 The need for a Trap
Model 2511 pumps are resistant to moisture-induced corrosion. The collection vessel has a float valve is
attached to the regulator assembly to prevent water condensate from accidentally being ingested into the
pump. An in line hydrophobic filter provides further protection against moisture ingestion.
WARNING
The pump is not recommended for pumping acid, base or organic vapors
or gases. Serious damage to the pump will shorten the pump’s service life.
In addition, pumping flammable vapors or gases can lead to serious safety
hazard leading to fire or explosion.
7

SECTION 3: OPERATION
3.10 Starting Procedures
3.11 Starting a Welch Aspiration/Filtration Vacuum System
Before attaching the pump to a system, familiarize yourself with the function and action of the Aspiration/
Filtration Vacuum System that you have acquired. Review the power requirements as described in
Section 2.60. Welch recommends running the pump for a few minutes to warm it up, before use. The
warm-up improves the pumps ability to handle humid air. Set the device on a level, sturdy surface so the
controls can be easily reached and adjusted. Be certain that the tubing extends from the pump vacuum
inlet through the in line filter to the collection vessel. Connect one end of the application tubing to the lid
vacuum port marked “application”
Note: The in-line hydrophobic filter is designed to prevent foreign material from being drawn into the
pump. Pump performance may decrease if the hydrophobic filter gets wet or build up of foreign materials.
Change the hydrophobic filter periodically to maximize pump performance and protection.
1. Be sure that the power switch is in the OFF (down) position. Plug in the device and turn the switch to
the ON (up) position.
2. Adjust the rate of aspiration using the control knob and vacuum gauge.
3. Aspiration can be actuated by 1) turning pump on/off using a foot switch or 2) controlling liquid flow
using a handheld pipettor.
See 9.21 or visit www.welchvacuum.com for fluid control options and pipette/manifold configurations
3.12 Cleaning The Device
1. Make sure the ON/OFF switch is in the OFF (down) position.
2. Unplug the device from the wall outlet and allow suction level to drop.
3. Remove the application tube from the lid vacuum port. Tubing can be cleaned after every use.
4. Remove the pump tubing from the top of the jar lid.
5. Remove the jar from the holder and place on a firm, flat surface. Release the tabs and lift the lid
from the jar. Dispose of aspirated fluid appropriately.
6. Wash the jar, gasket, lid and tube in a hot water/dish washing detergent solution and rinse with hot tap
water. The collection vessel and lid are autoclaveable and bleach resistant.
7. Wipe the outside of the case with a clean, damp cloth after each use.
3.20 Leak Detection
3.21 If a leak exists, the pump must remove added volume of gas to maintain the desired vacuum. Check
all tubing connections and ensure that collection vessel gasket is clean, in good repair, and fits flush
to container and lid contact surfaces. Secure lid tabs firmly to compress gasket and facilitate proper
sealing. Leaks for these pumps can be located by slightly pressuring the system and painting the
suspected area with a thick soap solution. Escaping air will produce soap bubbles.
8

3.30 Operating Pressure Range
3.31 Aspiration/Filtration Vacuum Systems are designed to be run from slightly below atmospheric to their
maximum vacuum level on the intake side. The pumps also may be run from atmospheric to their
maximum rated pressure rating. Consult the Specification Table for the ratings of your specific model
(See Section 6, Specifications).
3.40 Shutdown Procedures
3.41 After use, Welch recommends the pump be run for about 2 minutes disconnected from the vacuum
process. The air pumped through the mechanism will purge out water vapor or droplets of water
condensate that may have formed on the inside of the pump. This purge of the pump mechanism
helpsprevent corrosion, and maintain performance.
SECTION 4: MAINTENANCE
4.10 Maintenance Procedures
4.11 Maintaining a Welch Aspiration/Filtration Vacuum System
These units are 100% oil-free. The pump employs a non-lube piston and cylinder. No maintenance is
necessary for the bearings. All bearings are sealed and permanently lubricated. Lubrication should not be
attempted.
4.12 Empty collection vessel
Your 2511 aspiration station uses a float valve on the collection vessel lid to prevent overfilling and
provide pump protection. To empty, remove the middle collection vessel tube (“to pump”), set lid aside,
empty collection vessel appropriately, reinstall collection vessel and lid, and reconnect pump to lid.
4.13 Hydrophobic Filter Replacement
Change the filter whenever foreign material is drawn into it or if you notice a reduction in vacuum level.
1. Disconnect the long tube from the fitting on top of the jar lid.
2. Gently pull the hydrophobic filter off of the short tube, that is connected to the regulator inlet port, and
then remove the long tube from the hydrophobic filter .
3. With the green dot facing down, push the new hydrophobic filter into the short tube, that is connected
to the regulator inlet port, then push the long tube.
4. Connect the long tube to the green dot facing barb, and then connect to the fitting on top of the jar lid.
9

SECTION 5: TROUBLESHOOTING
5.10 VACUUM PROBLEMS
5.11 Leakage, contamination, and unusual outgassing are the general causes of problems associated with
poor vacuum. To operate at maximum efficiency, a system must be thoroughly clean. If the system is
completely clean and free from leaks and unwarranted vacuum problems still exist, the pump should be
checked. A simple criterion for the condition of the pump is the determination of its maximum vacuum
capability. This can be accomplished by blocking of the intake and reading the vacuum level on the gauge
(See Section 2.80).
5.20 PRESSURE PROBLEMS
5.21 Leakage and contamination are the general causes of problems associated with poor pressure. To
operate at maximum efficiency a system must be thoroughly clean. If the system is completely clean and
free from leaks and unwarranted pressure problems still exist, the pump/compressor should be checked
by a service technician.
5.40 TROUBLE SHOOTING GUIDE FOR 2511
10
Symptoms Possible Cause Remedies
Reduced/low
Vacuum/flow 1. Clogged hydrophobic filter.
2. Regulator improperly set.
3. Air leak.
4. Jar lid gasket not secured to jar.
5. Collection vessel is full.
1. Replace the filter following directions in this
manual. (Section 4.12)
2. Set vacuum level following operating
instructions.
3. Check the tubing and connectors for possible
leaks. Attach, tighten or replace.
4. Be sure the jar lid and gasket fit tightly on the
jar.
5. Empty vessel and reinstall.
Device does not
start 1. Power cord not plugged in. 2. Defective switch.
3. Vacuum still exists in system.
1. Plug in the power cord.
2. Contact your service center or distributor. (See
back page)
3. Disconnect tubing from the collection jar to
release vacuum. Reconnect tubing and turn on
the device.
Gauge reads
incorrectly 1. Faulty gauge. 1. Contact your service representative.
Device runs but
gauge reads “0” 1. Gauge tubing not connected or is leaking. 1. Check the tubing and connectors for possible leaks. Attach, tighten or replace.
Device stops
running during
use
1. Device overheated.
2. Blown fuse or circuit breaker in
household circuit.
3. Low voltage to device.
1. Unplug device and allow to cool for 10 minutes.
Plug in and restart.
2. Replace fuse or reset circuit breaker.
3. Too many motor operated appliances on same
circuit.

11
SECTION 6: SPECIFICATION
6.10 SPECIFICATION TABLE
67-C515257-C5152-771C525167-C115257-C115257-B1152.oN.taC
)nim/L(MFCtnemecalpsiDriAeerF
)11(93.0)2.9(23.0)11(93.0 )11(93.0
gH.nimuucaVmumixaM
)rabm(rroTmuucaVetamitlU
)mc(.niHxWxLsnoisnemiD
sbl,thgieWgnippihS
stne
meriuqeRlacirtcelE ,V511,V032 zH05 ,V001 zH06/05
4.6
)292(912
)5.52x12x82(0.01x3.8
x0.11
3.12
1152ledoM
,V032
zH06 zH06

SECTION 7: WARRANTY
IMPORTANT
Please Read Carefully Before Operating
This Welch® Vacuum Pump
Unpacking
Inspect the pump carefully. If any damage has occurred, file claim with the freight carrier immediately.
Save the shipping container for carrier to inspect.
Operating Pump
Refer to the Instruction/Operation Manual for all information to properly operate and maintain the
pump
Warranty
The Welch Vacuum product is warranted to be free from defects, in material and workmanship. The
liability of Gardner Denver Welch Vacuum Technology, Inc. under this warranty is limited to servicing,
adjusting, repairing or replacing any unit or component part which in the judgement of Welch Vacuum
has not been misused, abused or altered in any way causing impaired performance or rendering it
inoperative. No other warranties are expressed or implied. The method of executing this warranty:
servicing, adjusting, repairing or replacing shall be at the discretion of Welch Vacuum. Vacuum pumps
that have been used for any period, however short, will be repaired under this warranty rather than
replaced.
The warranty is effective for one year from the date of original purchase when:
1. The warranty card has been completed and returned.
2. The product is returned to the factory or other designated service centers, freight prepaid.
3.The product, in our judgement, is defective through no action or fault of the user.
Iftheproducthasbecomedefectivethroughmisuse,abuse,oralteration,repairswillbebilledregardless
oftheageoftheproduct. Inthisevent,anestimate oftherepaircostswillbesubmitted andauthorization
of these charges will be required before the product is repaired and returned.
Toreducetheadditionalchargesanddelayseitherwithinoroutsideofthewarrantyperiod,contactWelch
Vacuum at [phone] for a return authorization number. Products without a return authorization
numberwillbereturnedbyourreceivingdepartment. Beforeshipping,packthepumpproperlyandinsure
itagainstlossordamage.Pumps damageddueto improperpackagingarethecustomer’sresponsibility.
Mark the outside of the carton and the packing slip with the return authorization number.
12

13
SECTION 8: EXPLODED VIEW & PARTS LIST
8.10 Model 2511B-75 / 2511C-75 / 2511C-76 / 2511C-77
PUMPON/OFF SWITCH
REGULATOR
KNOB VACUUM GAUGE SHORT
TUBING
LONG
TUBING
APPLICATION
TUBING
HYDROPHOBIC
FILTER
PRESSURE PORT COLLECTION
JAR

9.20 VACUUM ACCESSORIES
9.21 Table for Vacuum Accessories
14
Operating Instructions: Hand-Held Pipettor (cat. No. 1475K-10)
for Welch®Aspirator Stations
Operation
The vacuum is controlled by the pressure sensitive turquoise control button on the top of the hand
piece. By means of the plastic screw opposite the control button, the residual suction level can be
set, which will prevent dripping of waste liquids from the tip or pipette. The aspirator is factory pre-set
to allow a low level of constant suction; by turning the screw one full turn clockwise, the valve is shut
and residual vacuum is stopped.
Cleaning and servicing
The hand-held pipettor is entirely autoclavable. When working with biohazards material, sterilize the
unit before disassembling for cleaning. Please refer to the exploded view drawing.
To clean, immerse the pieces in mild laboratory detergent, but do not use abrasives, as a roughened
surface may affect the smooth operation of the control valve. Apply a thin coat of MOLYKOTE HP-
870(Dow Corning) lubricant as needed to the control valve to keep the action smooth (arrow).
When working with salt-rich solutions, rinse out the aspirator hand-held pipettor with distilled water
after use to avoid build-up of dried deposits.
Chemical compatibility
Avoid prolonged contact( days or weeks) with: Resistant to:
- Concentrated inorganic acids - Ethanol/methanol
- Methylene chloride - Mild bleach solution (Rinse promptly)
- Concentrated aldehydes
- Other halogenated hydrocarbons
Note:
• Flush the aspirator with ethanol immediately after contact with organic solvents
• For O-ring replacement, use Fluoroelastomer® O-rings only.

15
Accessories for WelchAspiration Stations
Compact Model 2511 Station
Cat. No. Description
2511B-75 11 l/min 115V 60Hz
2511C-75 9.2 l/min 230V 50Hz
2511C-76 11 l/min 100V 60/50Hz
High Flow Model 2515 Station
Cat. No. Description
2515B-75 34 l/min 115V 60Hz
2515C-75 28 l/min 230V 50Hz
2515C-76 34 l/min 100V 60/50Hz

9.30 ELECTRICALACCESSORIES
9.31 Table for Electrical Accessories
9.40 REPLACEMENTACCESSORIES
9.41 Table for Replacement Accessories
$ESCRIPTION 7ELCH+IT
115V 60Hz - Maintained on/off footswitch
1430A
115V 60Hz - Variable on/off footswitch
1430B
90-230V 50/60Hz - Variable on/off footswitch
with IEC connections
1430C
$ESCRIPTION 7ELCH+IT
Aspiration Kit - Includes: 6 ft tubing, 2000ml Autoclavable
jar w/lid, and two hydrophobic filters
1475K-20
ten hydrophobic filters
1475K-21
16

Welch-Ilmvac
5621 W. Howard Street
Niles, IL 60714
Phone: [phone] (Technical Support)
Fax: [phone]
E-Mail: [e-mail]
Web-Page: www.welchvacuum.com
Copyright© 1997-2007 Gardner Denver Welch Vacuum Technology
Welch is registered trademarks of Gardner Denver Welch
Sales and Service Offices For Gardner Denver Thomas, Welch Vacuum Technology
USA, Canada, Latin America
Gardner Denver Thomas, Inc.,
Welch Vacuum Technology
5621 W. Howard St.
Niles, IL 60714 USA
Phone: [phone]
Fax: [phone]
Email: gdwelchvacuum@gardnerdenver.
com
Asia
Gardner Denver Hong Kong, LTD.
Unit 2503, Metropole Square
NO. 2 On Yiu St., Siu Lek Yuen
Shatin, New Territories, Hong Kong,
P.R.C.
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Europe
Gardner Denver UK
Waterbrook Estate, Waterbrook Road
Alton Hampshire
GU342UD United Kingdom
Phone: [phone]
Fax: [phone]
Email: [e-mail]