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GEM® DIRECT-DRIVE VACUUM PUMP
Never Block the Exhaust Port. If the exhaust is blocked, pressure
will build-up in the pump with the potential of the pump body
bursting and causing possible injury to personnel in the area
7301 North Central Avenue
Skokie, Illinois 60077
Phone: (847) 676-8800
Fax: (847) 677-8606 (Technical Support)
Fax: (920) 451-4397 (Ordering)
E-Mail:welchvacuum@thomasind.com
Web-Page: www.welchvacuum.com
OWNER'S MANUAL
FOR
MODEL 8890
WARNING
For outside U.S. and Canada, contact your local
Rietschle Thomas sales office, see back page
.
Part No. 61-1172AR1.7
Printed in U.S.A.
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Table of Contents
Troubleshooting
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Summary of Contents for Welch 8890
- Page 1 OWNER’S MANUAL GEM® DIRECT-DRIVE VACUUM PUMP MODEL 8890 WARNING Never Block the Exhaust Port. If the exhaust is blocked, pressure will build-up in the pump with the potential of the pump body bursting and causing possible injury to personnel in the area 7301 North Central Avenue For outside U.S.
- Page 2 PLEASE READ BEFORE OPERATION While reading your manual, please pay close attention to areas labeled WARNING AND CAUTIONS. 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 should result in damage to the equipment, associated equipment and process.
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Page 3: Table Of Contents
TABLE OF CONTENTS Warranty ..................4 Section 1 – Installation ..............5 Section 2 – Pump Features and Principles of Operation ..... 8 Section 3 – Specifications .............. 13 Section 4 – Parts List and Exploded Pump View ......16 Section 5 – Operation ..............18 Section 6 –... -
Page 4: Warranty
Welch Rietschle Thomas under this warranty is limited to servicing, adjusting, repairing or replacing any unit or component part which in the judgment of Welch Rietschle Thomas has not been misused, abused or altered in any way or damaged by ingestion of foreign material causing impaired performance or rendering it inoperative. Foreign material includes solids, liquids, corrosive gases and recondensed water or solvent vapor. -
Page 5: Section 1: Installation
This manual has been written for the care and maintenance of the Model 8890 Vacuum Pump. Take time to read it carefully, and keep it for future reference. One of the most important aspects of any pump installation is the precautions taken to prevent condensable vapors from collecting in the pump. - Page 6 WARNING Never block or impede air flow from the exhaust port. High pressure can build up within the oil reservoir if the exhaust flow is blocked. Check frequently, especially if exhaust is piped out of the building. 1.6 Electric Power Compare the pump motor rating, printed on a label on the side of the motor, to the power source, to be sure they agree in voltage, phase, and frequency.
- Page 7 1.9 Vacuum Pump Oil CAUTION The vacuum pump is shipped without oil inside to prevent possible spillage during shipment. Oil must be added prior to use. Remove the fill plug located on the top of the oil case and add the oil supplied in a bottle packaged with each pump.
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Page 8: Section 2: Pump Features And Principles Of Operation
Note that this figure is not intended to illustrate the internal components of a gerotor pump such as the Model 8890; its purpose is to illustrate the general operating principles of vacuum pumps. The rotary action of the pump creates a hollow space or chamber (1) which expands as the pump rotates. As the chamber expands, the pressure in the chamber decreases. -
Page 9: Ultimate Pressure
2.5 The Gerotor Vacuum Pump The Model 8890 Vacuum Pump uses patented technology, (U.S Patent No. 4,519,755) developed by Welch Vacuum, employing two gerotor stages to pump gases. Each gerotor stage consists of an inner rotor and an outer roto Figure 2-2 is a cutaway view of a single gerotor pump showing the inner and outer rotors. - Page 10 2.6 Pump Mechanism Description The Model 8890 Vacuum Pump incorporates two separate in-line gerotor stages with interconnecting ports. Relative to each other, the intake stage is at high pressure and the exhaust stage is at low pressure. Each stage contains a two piece gerotor assembly consisting of an inner drive rotor and an outer driven rotor;...
- Page 11 2.7 Pump Lubrication To ensure efficient operation and proper maintenance, and to minimize noise and oil vapors, it is important to use the correct type and quantity of oil. DIRECTORR® Premium Vacuum Pump Oil has been especially developed to have the proper viscosity, low vapor pressure, and chemical stability needed to produce peak pumping efficiency.
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Page 12: Section 3: Specifications
Section 3: SPECIFICATIONS Table 3.1 Pump Specifications i t l e t i " 8 " 8 l l a t l i t l i e t i * Partial measurement based upon the American Vacuum Society Test Procedure No. AVS 5.1-1963 using a trapped McLeod Gauge. - Page 13 Figure 3.1 Pumping Speed Curve Figure 3.2 Pump Down Curve of Model 8890 Vacuum Pump of Model 8890 Vacuum Pump Figure 3.3 Dimensional Drawings, Model 8890 Vacuum Pump...
- Page 14 Table 3.2 Motor Power Specifications and Special Features, Model 8890 Cat. No. Voltage Freq. Phase Factory Special Feature Wired For 8890A 115/230 115 V 8890A-55 115/230 115 V Isolation Valve 8890A-85 115/230 115 V Prepared for use with Fomblin YL-VAC-06/6,...
- Page 15 PARTS LIST 8890A VACUUM PUMP ITEM QTY PC. NO. A* B* DESCRIPTION ITEM QTY PC. NO. A* B* DESCRIPTION 62-1037 Screw, Fillisterhead, #8-32x7/16 61-1119B Gasket 61-2370 Window Holder 61-1318 Mounting Plate 61-2229A Window Glass 61-1321 Mounting Plate 66-0304 O-Ring, Fluoroelast. #127 61-9429 Screw, 10-32x3/16 with O-ring 61-2413...
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Page 16: Section 5: Operation
5.2 High Pressure Operation The Model 8890 pump is designed to be most efficient when operated at or near its ultimate blankoff pressure. When operated at elevated pressures, the exhaust filter provided should be used. When operated at high pressures for long periods of time, this filter will saturate quickly, and puffs of “smoke”... -
Page 17: Section 6: Maintenance And Troubleshooting
Section 6: MAINTENANCE AND TROUBLESHOOTING 6.1 Vacuum Problems Inability to attain sufficient vacuum in a system is usually due to leakage, contamination, or unusual outgassing. A system must be thoroughly clean and free from leaks to operate efficiently. If the system is found to be clean and leak-free, but vacuum problems still exist, the pump should be checked. - Page 18 Shaft Seal Replacement When the shaft seal in the mounting plate shows signs of excessive oil leakage, it should be replaced. Before attempting replacement of the seal, the pump must be disconnected from the vacuum system and from the power outlet.
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Page 19: Troubleshooting
TROUBLESHOOTING 6.4 Trouble Shooting Guide... -
Page 20: Section7: Repair Service
7.3 Minor Repair Kit For Model 8890 Vacuum Pumps A minor repair kit, Cat. No. 8890K-02, is available for the Model 8890 Vacuum Pump. This kit contains a group of parts that can be replaced in the field. Table 7-1 lists the contents of the minor repair kit. Refer to Figure 4-1 Exploded View Diagram. - Page 21 Section 8: ACCESSORIES DIRECTORR® Premium Vacuum Pump Oil is the oil furnished with each new pump. The vacuum guarantee for this pump applies only when the recommended oil is used. Use of other types of oil in this pump can cause inferior performance, both in pumping speed and ultimate vacuum attained, and may eventually cause permanent pump damage.
- Page 22 Vacuum Gauge This solid-state gauge, Cat. No. 1515, provides an accurate and inexpensive means of measuring vacuum levels from 0 to 5000 millitorr. The gauge is portable, and is supplied with one permanently-attached probe cable, one gauge tube, and a carrying handle. This gauge should NOT be used to measure the pressure of flammable or explosive gases or vapors.
- Page 23 MATERIAL SAFETY DATA SHEET Welch 8995P Series DIRECTORR Premium Vacuum Pump Oil ® MSDS Welch P/N 67-0278A, Revision 4 HMIS Rating: Health: 0 Flammability: 1 Reactivity: 0 Special: X SECTION 1 - IDENTIFICATION Chemical Name: Severely Hydrotreated Paraffinic Oil Synonyms: DIRECTORR®...
- Page 24 SECTION 4 - FIRE AND EXPLOSION HAZARDS DATA Flash Point: 475°F Method Used: Flammable Limits: Upper: N/D Lower: N/D Auto-Ignition Temperature: Extinguishing Media: Use water spray, dry chemical, foam or carbon dioxide. Special Fire Fighting Procedures Water may be ineffective, but should be used to keep fire exposed containers cool.
- Page 25 FIRST AID MEASURES If Inhaled: Remove to fresh air. If victim has stopped breathing, give artificial respiration. Seek medical attention. In Case of Eye Contact: Immediately flush eyes with plenty of cool water for 15 minutes. Do not let victim rub eyes. In Case of Skin Contact: Wash affected area thoroughly.
- Page 26 NOTES ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________...
- Page 27 Vacuum Pump Repair Facility 7301 N. Central Ave. Skokie, IL 60077 Phone: (847) 676-8800 Fax: (847) 677-8806 OWNER’S MANUAL GEM® DIRECT-DRIVE VACUUM PUMP MODEL 8890 Part No. 61-1172R1.7 Copyright© 1993-2003 Welch Rietschle Thomas GEM® is a registered trademark of Welch Rietschle Thomas...
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