๐ง Product Overview
The BOC Edwards EXT70/70/200 is a 24 V cartridge-type turbomolecular vacuum pump designed for high-vacuum generation in laboratory, analytical, semiconductor, and industrial vacuum equipment. The model is part of the Edwards EXT compound turbomolecular pump family.
The listed unit is identified by part number B75651991 and is specified for 24 V operation. The EXT70/70/200 system is associated with the Edwards B756-52-991 documentation and is designed to work as part of a complete vacuum pumping system rather than as a standalone electrical device.
Its cartridge construction is useful when servicing or replacing the pumping assembly in existing vacuum equipment. Before installation, the pump configuration, flange arrangement, controller requirements, and mechanical mounting should be checked against the original system.
โ๏ธ Key Features
- BOC Edwards EXT70/70/200 cartridge turbomolecular pump
- 24 V configuration
- Part number: B75651991
- Designed for high-vacuum applications
- Oil-free turbomolecular pumping technology
- Cartridge-style replacement construction
- Suitable for analytical and industrial vacuum equipment
- Edwards EXT-series vacuum pump architecture
- Requires appropriate controller and system interfaces
- Mechanical and electrical compatibility should be confirmed before replacement
The EXT family includes compound turbomolecular pump configurations with defined inlet, outlet, vent, and optional interstage connections. Exact flange configuration depends on the specific pump version.
๐ Product Datasheet
| Parameter | Specification |
|---|---|
| Brand | BOC Edwards |
| Model | EXT70/70/200 |
| Product Type | Cartridge Turbo Pump |
| Part Number | B75651991 |
| Series | EXT Series |
| Pump Type | Turbomolecular Vacuum Pump |
| Rated Voltage | 24 V |
| Application | High-Vacuum Generation |
| Drive / Control | Requires compatible Edwards controller |
| Construction | Cartridge Type |
| Country of Origin | United Kingdom |
| Listed Weight | Approx. 8.72 kg |
| Condition | New / Never Used as listed |
| Unit Quantity | 1 Pc |
| Installation | Vacuum-system dependent |
| Compatibility | Verify against existing pump and controller |
The 8.72 kg value and the listed United Kingdom origin come from the referenced product listing. Other EXT configurations can have different mass and flange specifications, so the exact nameplate should be checked before ordering.
๐ ๏ธ Operating Function
A turbomolecular pump uses a high-speed rotor assembly to transfer gas molecules toward the exhaust side and progressively reduce the pressure inside a vacuum chamber. It is normally used together with a suitable backing or foreline pump because the turbomolecular stage is intended for high-vacuum operation.
For an EXT70/70/200 replacement, the most important checks are not only the pump model but also the controller, cable arrangement, flange dimensions, mounting orientation, and system interlocks.
The 24 V designation identifies the electrical version of the pump system. It should not be interpreted as meaning that the pump can be connected directly to an unregulated 24 V supply without the required Edwards control electronics.
๐ฉ Installation & Maintenance
- Confirm the pump model and part number against the equipment documentation.
- Check the inlet, outlet, vent, and any interstage connection before mounting.
- Inspect the pump and flange sealing surfaces for contamination or mechanical damage.
- Install the pump using the correct vacuum hardware and torque procedure.
- Connect the specified controller and pump cable. Do not bypass controller or protection circuits.
- Confirm that the backing-pump system is operating correctly before starting the turbomolecular pump.
- Bring the vacuum system into operation according to the original Edwards procedure.
- Monitor abnormal vibration, noise, temperature, rotational behavior, or controller alarms during commissioning.
- Avoid exposing the high-speed rotor to sudden mechanical shock or inappropriate venting conditions.
- When removing the pump, follow the required shutdown and venting sequence and allow the rotor to stop completely.
๐ Maintenance Tips
For a used or surplus EXT70/70/200 unit, visual inspection alone is not enough to establish operating condition. Particular attention should be given to rotor condition, bearings, connectors, flange surfaces, contamination, and controller communication.
If the pump has been stored for an extended period, verify its condition before putting it back into a production vacuum system. A vacuum leak test and controlled startup are recommended after installation.
Keep the inlet protected from dust and moisture during storage and transportation. Do not place unnecessary mechanical load on the pump body or shaft assembly.
โ Common Questions
Q: Is EXT70/70/200 a turbomolecular pump?
Yes. It is an Edwards EXT-series turbomolecular vacuum pump configuration intended for high-vacuum applications.
Q: What voltage does this version use?
The listed version is the 24 V configuration.
Q: What is B75651991?
B75651991 is the part number identified for the listed cartridge turbo pump.
Q: Can I connect it directly to 24 VDC?
Not necessarily. A compatible Edwards controller and the correct system wiring are required. Confirm the complete equipment configuration before applying power.
Q: Is the cartridge interchangeable with every EXT70 pump?
No. Model designation, mechanical configuration, electrical version, controller, and flange arrangement should all be matched before replacement.
Q: What applications use this type of pump?
Typical applications include analytical instruments, laboratory vacuum systems, industrial vacuum equipment, semiconductor-related systems, and other high-vacuum installations.
Q: Does the pump require a backing pump?
A turbomolecular pump normally operates as part of a vacuum pumping system and requires appropriate foreline/backing-pump support.
Q: What should be checked before purchasing a replacement?
Check the complete model number, part number, voltage, controller compatibility, flange size, mounting arrangement, and physical condition.
Q: Is B75651991 the controller part number?
No. It identifies the pump/system part listed here. The pump controller should be identified separately.
Q: Is the listed unit new?
The referenced listing identifies the unit as New / Never Used. Actual condition should always be confirmed from the seller’s current inventory and nameplate.
๐ 10 Related Edwards Models
- Edwards EXT70
- Edwards EXT70H
- Edwards EXT70/200H
- Edwards EXT200
- Edwards EXT200H
- Edwards EXT200H Hi
- Edwards EXT250
- Edwards nEXT70
- Edwards nEXT85
- Edwards nEXT240
These models are related to Edwards’ turbomolecular vacuum-pump range, but they are not automatically interchangeable with EXT70/70/200. Mechanical interfaces, pumping performance, controllers, and electrical configurations must be checked individually. The EXT70 family is documented with different flange and configuration variants.
๐ญ Application Summary
The BOC Edwards EXT70/70/200 is intended for equipment where stable high-vacuum generation is required and where a compact cartridge-style turbomolecular pump can be integrated into an existing vacuum system.
It is particularly relevant as a replacement or spare for older Edwards vacuum equipment where maintaining the original pump configuration is preferable to redesigning the complete vacuum system. Before purchase or installation, match the B75651991 part number, 24 V configuration, mechanical interfaces, and controller requirements with the existing equipment.
