WELCH-ILMVAC 2585B-01 User manual

OWNER’S MANUAL FOR
DRY VACUUM PUMP MODELS
2585B-01, 2585B-50, 2585B-55 & 2585Z-50
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.
Warning
Be sure to properly identify intake and discharge
before using pump. See section 2.5
WELCH-ILMVAC
Part No. 642799B
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
WARNING
Motor includes a self resetting thermal cutout and the pump could
restart without actuation under fault condition.
2

TABLE OF CONTENTS
Section 01 - Installation
1.01 Unpacking
1.02 Pump Mounting
1.03 Pump Location / Environmental Conditions
1.04 Exhaust Provisions
1.05 Electric Power
1.06 Vacuum Connections
1.07 Vacuum Gauges
1.08 Vacuum Pump Oil
Section 02 - Pump Features & Principles of Operation
2.01 General Description
2.02 Principles of Vacuum Pump Operation
2.03 Effects of Continued Pressure Reduction
2.04 Ultimate Pressure
2.05 Pump Mechanism Description
2.06 Intake Anti-Suckback Protection
2.07 Pump Lubrication
2.08 Exhaust Filter
2.09 Gas Ballast Valve
2.10 UNIBARBTM Intake Fitting
Section 03 - Specifications
3.01 Specification Chart
Section 04 - Motor Power Specifications / Features
4.01 Motor Specification Chart
4.02 Changing the Voltage Settings for Global Motor Option on “A”-Models
4.03 Changing the Voltage Settings for Global Motor Option on “C”-Models
4.04 Changing the Voltage Settings on “A”-Models
4.05 Other Electrical Configurations
4.06 Explosion Proof Pumps
Section 05 - Operation
5.01 Starting Procedure
5.02 High Pressure Operation
5.03 Shutdown Procedures
3

4
Section 1: SAFETY INFORMATION
I.10 CAUTION: To prevent injury.
I.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.
I.12 Keep the cord away from the heated surfaces.
I.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.
I.14 The PTFE pump is thermally protected and can automatically restart when the protector resets.
Always disconnect power source before servicing.
I.15 Wear safety glasses or goggles when operating this product.
I.16 Use only in well ventilated areas. The motor is fan cooled enclosed in a shell.
I.17 All electrical products generate heat. To avoid serious burns never touch unit during or
immediately after operation.
I.18 Be sure to properly identify intake and discharge before using pump. See Section II-5.
I.20 CAUTION: To reduce risk of electrical shock....
I.21 Do not disassemble. Disassembly or attempted repairs if accomplished incorrectly can create
electrical shock hazard. Refer servicing to qualified service agencies only:
Call [phone] Ext. 1
I.22 Unit is supplied with a three pronged plug. Be sure to connect pump to a properly grounded
outlet only.
I.23 WARNING: To reduce risk of electrocution.
I.24 Do not use this product in or near area where it can fall or be pulled into water or other liquids.
I.25 Do not reach for this product if it has fallen into liquid. Unplug immediately.
I.26 Never operate this product outdoors in the rain or in a wet area.
I.27 DANGER: To reduce risk of explosion or fire…
I.28 Do not use this pump near explosive atmospheres or where aerosol (spray) products are being
used.
I.29 Do not use this product near flames.
WARNING
Do not operate the pumps in an atmosphere containing
flammable or explosive gases/vapors.
WARNING
Never block the exhaust port. If the exhaust is blocked, pressure
will build-up in the pump with the potential of the pump head
bursting and causing possible injury to personnel in the area.
WARNING
Failure to observe the above safety precautions could result
in severe bodily injury, including death in extreme cases.

5
Section 2: INSTALLATION
2.10 Introduction
This manual has been compiled not only for the care and maintenance of the Welch Dry Vacuum Sys
tem now in your possession, but as a helpful reference and guide to prevent many problems which can
occur if used improperly.
2.11 Unpacking
Carefully remove the Dry Vacuum System from the shipping carton. 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 system to the factory without first calling for a returned goods number. Call [phone]
2.12 System Mounting
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.
2.13 System Location and Enviromental Condition
The Dry Vacuum System should be located preferably in a clean, dry and well ventilated area. Please
be sure not to block the ventilation ports located on the metal shell. The pump should be placed where
the surrounding temperature remains between 10°C and 40°C (50°F and 104°F). Always check to in-
sure the location chosen is protected from direct or indirect moisture contact. The pump should
be located as closely to its system in order to utilize it most efficiently. The pump is rated
for indoor use only.
Maximum altitude 2000 meters. Operating temperature range 5°C to 40°C. Maximum relative humidity
of 80% for temp. up to 31°C decreasing to 50% at 40°C. Rated for ±10% of supply voltage.
Pollution Degree2, Installation Category II.
2.14 Inlet and Outlet Provisions
A inlet hose barb which accepts ¼” I.D. hose makes it easy to connect the system to your concentrator,
rotary evaporator or gel dryer. Since the vacuum system operates in the viscous flow regime, the small
diameter of the hose will generate minimal conductance loss. For best results, Welch recommends the
length of the tubing between the pump and the apparatus be kept as short as possible. Hose clamps
should be used to hold the hose in place.
The hose barb in the outlet port of the pump accepts ¼” ID hose. A vent line can be attached to the
outlet hose barb which allows gases and vapors pumped through the pump to be piped to a fume hood.
Be sure to call Welch technical service prior to start-up at [phone] if you have any questions.
WARNING
Don’t operate this pump in an atmosphere
containing flammable or explosive gases or vapors.
WARNING
The motor is thermally protected and will automatically
restart unexpectedly when the overload device resets.
WARNING
Never Block The Outer Port. If the outlet is blocked, pressure will
build up in the pump which can lead to the pump head bursting
creating the potential of serious injury.
remove plug from outer port.

6
2.20 Electrical Power
2.21 Power Source Review
Review the power source and the voltage rating on the units serial number tag to be sure they agree in
voltage, phase and frequency. Serious damage may occur to the system if it is connected to an im
proper voltage. All Welch systems must be grounded. Grounding reduces the risk of electric shock
in the event of an electrical short circuit. The plug must be plugged into an outlet properly grounded.
Consult your local electrical codes if you have doubts.
2.22 Overload Protection
The motor manufacturer makes motor thermal overload protection availeble as an aid to minimize mo-
tor failure. Overload protection is a standard feature on both 50/60Hz single-phase motors. The motors
have automatic overload protection. Automatic reset protection is designed to reset itself after a
predetermined cooling period. If the fault to the drive remains unaltered, the motor will cycle on and off
until fault is corrected.
2.23 Identification Symbols
2.24 Grounding Instructions
This product should be grounded. In the event of an electrical short circuit, grounding reduces the risk
of electric shock by providing an escape wire for the electric current. This product is equipped with a
cord having a grounding wire with a grounding plug. The plug must be plugged into an outlet that is
properly installed and grounded in accordance with all local codes and ordinances.
This adapter shown in Figure #1 B and C is not acceptable in Canada.
If repair or replacement of the cord or plug is necessary, do not connect the grounding wire to either flat
blade terminal. The wire with insulation having an outer surface that is green with or without yellow
stripes is the grounding wire.
Check with a qualified electrician or serviceman if the grounding instructions are not completely
understood, or if in doubt as to whether the product is properly grounded. Do not modify the plug
provided; if it will not fit the outlet, have the proper outlet installed by a qualified electrician.
DANGER
Improper installation of the grounding plug
can result in a risk of electrical shock.

7
This product is for use on a nominal 120V circuit, and has a grounding plug that looks like the plug
illustrated in Sketch A in Figure #1. A temporary adapter, which looks like the adapter illustrated in
sketches Band C, may be used to connect this plug to a 2-pole receptacle as shown in sketch B if a
properly grounded outlet is not available.
The temporary adapter should be used only until a properly grounded outlet (Sketch A) can be installed
by a qualified electrician. The green colored rigid ear, lug, etc. extending from the adapter must be
connected to a permanent ground such as a properly grounded outlet box cover. Whenever the adapt
er is used, it must be held in place by a metal screw.
2.25 Extension Cords
If necessary to use an extension cord, use a 3-wire extension cord that has a 3-blade grounding plug,
and a 3-slot receptacle that will accept the plug on the product. Make certain your extension cord is
in good condition. Make certain your extension cord wire size is not less than 18 gauge for 25 feet, 16
gauge for 50 feet, and 14 gauge for 100 feet. An undersized cord will cause a drop in line voltage
resulting in loss of power and overheating. If in doubt, use the next heavier cord. The smaller the
gauge number, the heavier the cord.
2.26 Dial Vacuum Gauge
A dial vacuum gauge is incorporated in the vacuum system. The dial gauge is located in the top front
section of the system. The dial vacuum gauge is commonly used to indicate vacuum level when
operating in the rough vacuum range (0 to 29.9”Hg) Dial vacuum gauges give negative pressure - that
is pressure below atmospheric. The reference point for the gauges is atmospheric pressure. Please
keep in mind that atmospheric pressure tends to vary from day to day. As a result of this variability, a
dial vacuum gauge will indicate slightly different maximum vacuum readings from day to day.
2.27 Vacuum Level Regulation
Vacuum level regulation is accomplished with an adjustable bleed valve. The adjustable bleed valve
allows close control of pressure in your apparatus. Pressure may be set between roughly atmospheric
pressure and the maximum vacuum obtainable (9 torr, 29.6 in Hg).
2.28 Vacuum Connections
All Dry Vacuum Pumps come with intake and discharge hose barbs which accept 3/8” ID rubber
pressure/vacuum hose. Hose clamps should be used to hold the hose in place. Since all six models
operate in the viscous flow range, the small diameter of the hose will generate minimal conductance
loss. For best results, Welch recommends the length of the tubing between the pump and the chamber
be kept as small as possible.
2.29 Vacuum Gauges
Typical in the rough vacuum range, a dial vacuum gauge is used to measure pressure in mm, Hg or
inches of Hg. The dial vacuum gauge gives negative pressure – that is pressure below atmospheric.
The reference point for the vacuum gauge is atmospheric pressure.
Please keep in mind that atmospheric pressure tends to vary from day to day. As a result of variability,
the dial vacuum gauge will indicate slightly different maximum vacuum readings from day to day.

8
2.30 Traps
2.31 The need for a Trap
The pumps will handle humid air. All wetted aluminum parts are treated for corrosion protection from
moisture. All other wetted parts are stainless steel. If there is a chance liquid may be drawn from the
process under evacuation, Welch recommends a liquid trap be placed between the process and the
pump. A simple liquid trap is a filtering flask.
When a heavy load of water vapor is evolved from the vacuum process, a cold trap is recommended to
help prevent damage to the pump mechanism. The cold trap, immersed in a suitable Dewar flask, is
installed so that the water vapor may come in contact with the surfaces of the trap and condense.
Commonly used refrigerants are liquid nitrogen or dry ice and acetone or alcohol. Dry ice provides
sufficient cooling to freeze out most heavy water vapor loads. A variety of cold traps are available from
Welch.
The symptom of a high water vapor load is if you have droplets coming out of the exhaust port. If you
see droplets of water, Welch recommends you use a cold trap to capture the water before entering the
pump or dilute the water vapor stream by adding dry nitrogen to the gas flow. Please call our customer
service department for additional information at [phone] Ext. 1.
2.32 The care of a Trap
When using a cold trap the refrigerant should be maintained at a high level in the flask to keep the trap
at a uniformly low temperature. If the trap is re-warmed it may allow re-evaporation of the
ondensate. The refrigerant add tube on the liquid nitrogen trap should not be obstructed as the
refrigerant boil-off can produce dangerously high pressures. If the trap becomes saturated it should be
disconnected from the system, drained and cleaned. An increase in pressure in the vacuum system
will normally indicate that the trap has become saturated. To clean the trap, remove the trap from the
system and allow the trap to warm up and rinse off the condensate with a suitable solvent in a fume
hood. Thoroughly clean and dry the trap before reinstalling into the system.

9
Section 3: OPERATION
3.10 Starting Procedures
3.11 Starting a Welch Dry Vacuum Pump
Before attaching the pump to a system it is well to familiarize yourself with the function and action of
the pressure vacuum pump that you have acquired. Review the power requirements as described in
Section 2.6. Welch recommends running the pump for a few minutes to warm up before use. The
warm-up improves the pump’s ability to handle humid air.
3.12 Cleanliness
Take every precaution to prevent foreign particulates from entering the pump. Particulates will damage
the pump’s performance. If you find that particulates will come off the process during evacuation, a
particle trap in the foreline will work. A simple, inexpensive trap may be made by placing glass wool in
a glass or plastic tube. Screens must be inserted to hold the glass wool in place.
3.13 Leak Detection
The importance of eliminating all leaks in a vacuum system is obvious. The pump must remove this
added volume of leaked gas to maintain the desired vacuum. 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.
3.14 Operating Pressure Range
Model 2585 Dry Vacuum Pumps are designed to be run from atmospheric to their maximum vacuum
level on the intake side. Consult the Specification Table in the back of this manual for the ratings for
your specific model.
3.15 Shutdown Procedures
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 helps
prevent corrosion.
Section 4: MAINTENANCE
Welch dry pressure\vacuum 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. The units are built for continuous duty operation with the
quietness and durability of a diaphragm, but with piston pump performance.
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.

10
Section 5: TROUBLESHOOTING
5.10 Vacuum Problems
Leakage, contamination and unusual outgassing are the general causes of problems 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 2.8).
5.11 Troubleshooting Guide
Section 6: SPECIFICATION
6.10 Pump Specifications
Model 2585
Free Air Displacement 7.1 CFM @60Hz
(201 L/min. @60Hz)
10.0 M3 @50Hz
(168 L/min. @50Hz)
Ultimate Pressure 60 Torr, (80mbar)
Maximum Vacuum 27.6 In.Hg.
Motor Horsepower 1/3 (250 watts)
Tubing needed I.D. 3/8”, (10mm)
Intake & Exhaust Thread 3/8 NPT
Weight 22.5 lbs (10.3 Kg)
Overall Dimensions 17 x 7.5 x 12 Inches
43.2 x 19.1 x 30.5 cm
Poor
Pumping
Speed
Poor
Vacuum Loud Unit Possible Cause Corrective Action
X X X Damaged Valves Replace flapper Valves
X X X Debris in Valves Remove debris and check for valve damage
X X X Damaged Gasket Replace Gasket
X X X Loose Head Screw Tighten Head Screw
X X X Loose Fitting Tighten Fitting

11
6.11 Pumping Speed Curves
6.12 Dimensional Drawing
MD
A
N
C
K
B
G
I
F
E
H
L
J
2585
NIPPLE FOR 3/8 I.D. TUBING
1412C SILENCER
SUCTION CUP FEET
2585
A 12”
B 11.6”
C 7.37”
D 5.25”
E 10.5”
F 8.5”
G 9.5”
H 8.75”
I 3.06”
J 0.75”
K 4.62”
L 0.75”
M 4.5”
N6”

12
6.18 Parts List and Exploded View for Pump Model 2585
Item Qty. Description Service Kit
2585K-03 Seal Kit 2585K-04 Feet Kit 2500K-04
1 2 Connecting Rod Ass’y 2 - -
2 2 O-Ring Valve Plate 2 2 -
3 2 O-Ring, Connector Tube 4 4 -
4 8 Head Screw 8 - -
5 4 Rubber Suction Feet - - 4
6 2 Valve Plate Ass’y 2 - -
7 2 O-Ring Cylinder 2 2 -
8 1 Muffler 1 - -
Note 1: These parts are not available separately, but are supplied within the kits shown in last three columns.

13
Section 7: APPLICATION INFORMATION
7.10 Vacuum System for Cell Harvesting:
- 2585B-01
- 2585Z-50
- 2585B-50
- 2585B-55
7.11 System Components
7.12 Vacuum System for Cell Harvesting:
The vacuum system provides high throughput flow which allows up to 96+ sample systems to be
handled. The attached inlet trap is provided to inhibit the accidental ingestion of liquid into the pump.
Vacuum level is preset at 26”Hg with the inlet plugged. The vacuum gauge provided allows you to
check the vacuum level that is pressure below atmospheric. The reference point for the vacuum gauge
is atmospheric pressure. Be aware that atmospheric pressure will vary from day to day. As a result of
this variation, the dial vacuum gauge will indicate slightly different maximum vacuum readings from day
to day.
The preset vacuum level may be adjusted by opening or closing the orifice. A small leak through the
orifice is provided to allow easy restart of the pump if you are turning off then immediately turning on
the pump as is found with some cell harvesting applications.
By turning the screw located on top of the orifice clockwise, the vacuum level can be dropped to as
low as 27.6”. The deeper vacuum is particularly useful for removing sticky or viscous substance. If you
close off the orifice, please keep in mind this will lead to restart problems if you are turning off then
immediately turning on the pump. If you encounter a restart problem after closing the orifice, you will
need to incorporate into your procedure bringing the cell harvester up to atmospheric prior to restarting
the pump.
2585B-01 2585Z-50 2585B-50 2585B-55 Qty. Part No. Description
* * 1 1 Cap Assembly, Machined
* * 1 2 Needle Valve
* * 1 3 Knob
* * * * 1 4 Hose Barb Fitting
* * 1 5 Hose Barb Connector
* * 1 6 Vacuum Gauge
* 1 6 Vacuum Gauge
12, 3
4,5
6

14
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, Inc.
Welch is registered trademarks of Gardner Denver
Warranty
This Welch Vacuum product is warranted to be free from defects in material and workmanship. This
liability of Gardner Denver Welch Vacuum Technology under this warranty is limited to servicing,
adjusting, repairing, or replacing any unit or component part which in the judgment of Gardner Denver
Welch Vacuum Technology has not been misused, abused, or altered in any way or damaged by
ingestion of foreign material 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 Gardner Denver Welch Vacuum Technology.
Vacuum pumps that have been operated within a vacuum system, or other system, 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 judgment is defective through no action or fault of the user.
If the product has become defective through misuse, abuse, alteration, or ingestion of foreign material,
repairs will be billed regardless of the age of the product. In this event, an estimate of the repair costs
will be submitted and authorization of these charges will be required before the product is repaired and
returned.