General Description - Veeco MS40 Operation And Maintenance Manual

Portable automatic leak detector

Table of Contents

1.5

The MS-40 is a fully automatic, dual mode, turbo-molecular pumped

portable leak detector. Each of its two modes (Reverse Flow or Direct

Flow) is automatically selected by the leak detector based on the currently

selected leak rate range.

Reverse Flow Mode permits rapid testing for leaks in test objects that are

characterized by a high degree of out-gassing. Testing can start at test port

pressures of Atm for leaks from 10 to 1 x 10

testing) when using the optional external pump or pressures of 7.5 Torr

for leaks between 10 x 10

testing) for units not equipped with an external pump.

Direct Flow Mode is most useful for testing objects that demand clean

testing and higher sensitivity. In this mode, the leak detector measures

leaks from 10 x 10

millitorr or less. However, this mode is also capable of determining

larger leaks. Once the unit is in this mode and a larger leak has been

detected, the unit will range back to the appropriate decade.

The MS-40 uses two types of automatic testing: an automatic test mode

with automatic ranging and an automatic test mode with manual ranging.

In automatic ranging mode, the leak detector automatically ranges

downward (to more sensitive leak rate ranges) until a leak is found. When

using manual ranging, the operator of the leak detector controls the range

in which a particular test object is tested.

In the Automatic Test Mode, when using Automatic Ranging, all the

functions of the leak detector, including the evacuation (pump down) of

the test object and the functions of all pumps and valves are controlled by

the MS-40 computer. Additionally, all measurements and display

information about the leak rate and system performance are under the

control of the computer.

The Automatic Test Mode, when using Manual Ranging, is identical to

the Automatic Testing/Automatic Ranging mode except that the User

pre-selects the range (e.g., 10

either above or below the pre-selected decade, the leak detector operator

can manually range the unit either up or down. The remainder of the

testing procedure is handled by the MS-40 computer in exactly the same

Vacuum Instrument Corp.

manner as with the Automatic Ranging Mode.

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