Alcatel ASM Graph, ASM Graph D, ASM D, ASM 142 User Manual

ASM 142

/

142

D

ASM

GRAPH

HELIUM LEAK DETECTOR

/

GRAPH

D

/

GRAPH D+

User’s

Manual

Gb 02834

-

Edition

04

-

Feb

08

Alcatel Vacuum Technology, Lucent

Group, has been supplying helium and hydrogen leak detection plasma sensors, vacuum measurement for severa

as

part of the Alcatel-

vacuum pumps,

systems

,

l years. Thanks company multiple & Alcatel Vacuum Adixen, i

to its

complete range of products, the

has

become an essential player in

a

pplications : inst

D

eve

lopement, industry

rumentation, Research

and semic

Technology has

ts new brand name, in recognition o

onductors

launched

.

f

the company’s international standing in vacuum

sit

ion.

po

ISO

With both

Frenc

the in the high

h company

service

est

9001 and 14001 certifications,

is

an acknowlegded expert

and support, and

quality and

Adixen products have

environmental standards.

With 45 presence, a whole host and agents The first step was P

roducts years Fre In Europe, AVTF-France hea Alcatel Technology Benelux (Netherlands), Alcatel Vacuum Systems (Italy and more recently Adixen Sensistor

2007)

etw

n In Asia, Vacuum Technology (Japan), with Al Vacuum Technology Singapore, Alcatel Vacuum Technolog Sha This

epresensatives based

r Thus, produ specialists in

years

of

experience, AVT

through its

of

experienced subsidiaries, dist

international network that includes

today

has a w

.

the founding of Alcatel Vacuum

(Hingham- MA)

ago,

mont

(CA)

reinforced

and

Tempe (AZ)

in the United States, t

today by 2 others

.

US subsidiaries

dquarters and its subs

Hochvakuumtechnik (Germany),

Alcatel Vacuum

UK (Scotland), Alcatel Vacuum Technolog

AB

in Sweden (in

form the foundation for the European partner

ork.

our

presence starte

d in 1993 with Alcatel

and has been strengthene

catel

Vacuum Technology Korea (in 1995),

Technology Taiwan (in 2001),

nghai

(China) (in

organization

2004).

is

rounded off by more than 40

in a variety

whatever the circumstances, the

cts

can

always

rely on quick support of our

of continents

Alcatel Vacuum

users

Vacuum Technology.

orldwid

ributor

hirty

in

idiaries

Alcatel

.

of Adixen

e

s

,

y

)

d

y

A very wide range of helium leak

GB 00204 -

Edition

05 -

September

06

detectors

Dear customer,

You have just bought an Adixen leak detector. We would like to thank you and we are proud to count you among our customers. This

product is a result of the experience acquired over 35 years by Alcatel Vacuum

Technology France in vacuum and leak detection technology.

The applications of helium leak testing are extremely diversified ranging from high-tech

installation maintenance to highspeed testing of industrial products.

Each product of the Adixen detector range is designed to meet the specific needs of each application:

•

portability,

•

high sensitivity,

•

pumping capacity,

•

pumping type,

•

automation and integration in an industrial process.

1/2

A very wide range of helium leak

GB 00204 -

Edition

05 -

September

06

detectors

This

product

complies

with the

requirements

of

European

Directives, listed in the Declaration of Conformity contained in G100 of this manual. (E.C. The in German,

These Directives

Marking).

Declaration of Conformity and

Spanish,

are

Italian,

amended

by

Directive

Safety Instructions

Portuguese, Dutch

93/68/E.E.C

are available

and Danish

languages at the end of this manual.

Copyright/Intellectual property: The use

property rights in force in any jurisdiction. All rights any part without prior written authorization from Alcatel Vacuum T

echnology

of Adixen

reserved,

France.

products

are

subject

including copying this

to copyright and intellectual

document

in whole or

Specifications by from Alcatel

2/2

and information are

Vacuum Technology

subject

France.

to

change

without notice

M

anual reference

: 107817

ASM GRAPH D+: L0114

v3.1 r

.02

General

contents

ASM

142 -

ASM

142 D

D

ASM GRAPH

D+

User’s

Manual

GB 00205 -

Edition

07 - March 09

e

dition

:

07 - March 2009 Software version: ASM

142/ASM GRAPH

L

0088

v3.1 r

ASM

142 D/ASM GRAPH D/

Alcatel Vacuum Technology France - User’s

:

.02

Preliminary

remarks

Chapter

Chapter B

Chapter C

ASM GRAPH - ASM GRAPH

Throughout

“Summary of screen User’s

A

Manual ASM

Manual.

A 100 - Introduction A 200 A 201 A 202 A 300 A 400 A 401 A 500 A 600 A 700 A 800 A 801 A 900 A 901

B

100 - Safety instructions

B

110 - Unpacking - Storage - T

B

200 - Neutral gas purge and inlet vent connection

B

201 - Neutral gas purge installation (accessory)

B

210 - Connecting the

B

211 - Connecting the

B

300 - Controlling the

B

310 - Controlling the

B

320 - Connecting the

B

400 - Before

C

100 - Factory

C

110 - Operating principle of the control panel

C

120 - Setting

C

130 - Access

C

140 - Summary

C

200 - Starting up / Switching off the leak detector

C

210 - How to

C

211 - Operation of the leak detector

C

300 - Calibration of the leak detector

C

301 - Basic

C

302 - Advanced internal calibration of the leak detector

C

303 - External

C

304 - Correction factor

C

305 - Calibrated leak

C

306 - Adaptor for calibrated leak in sniffing mode

C

400 - Remote

C

410 - Headphone and loudspeaker

C

430 - 3

C

440 - Control panel with graphic interface

C

450 - Long

this

User’s

Please

-

ASM 142 - Detector

-

ASM 142 D - Detector

-

ASM 142 Graph D+ - Detector

-

Analyzer cell operating principle

-

Testing

methods

-

About Helium and Hydrogen

-

Operator interface: control panel

-

Options

-

Accessories

-

ASM 142 - T

-

ASM 142 D - ASM Graph D+ - T

-

Dimensions

-

Dimensions

starting up the leak detector

and

to level

internal calibration of the leak detector

masses

distance sniffer probe and Helium spray gun

142/142

D - ASM

Manual, you could find this type of message

C

140”: it

read it for further information.

to the ASM 142 series

operating principle

echnical

ASM Graph D+

configuration of the leak

maintenance

of screens

use

the leak detector: 2 methods

calibration of the leak detector

control

option

characteristics

echnical

ransportation

detector

detector detector detector

detector

to the installation

to the installation: ASM graph D+ with the I/O interface with a

PC computer

directly to a printer or another device

detector

part

presentation

4

-

Password

values

programming

GRAPH/GRAPH D/GRAPH

refers

to a specific chapter of the

INTRODUCTION

characteristics

through the

parameters

of the control panel

D+

RS

232 interface

INSTALLA

OPERA

TION

1/3

M

anual reference

: 107817

ASM GRAPH D+: L0114

v3.1 r

.02

General

contents

ASM

142 -

ASM

142 D

D

ASM GRAPH

D+

User’s

Manual

GB 00205 -

Edition

07 - March 09

e

dition

:

07 - March 2009 Software version: ASM

142/ASM GRAPH

L

0088

v3.1 r

ASM

142 D/ASM GRAPH D/

2/3

:

.02

Chapter

Chapter E

Chapitre F

ASM GRAPH - ASM GRAPH

C

500 - Inlet vent

C

510 - Bargraph zoom

C

520 - Audio alarm/Digital voice

C

530 - Cycle end

C

540 - Zero function

C

550 - Memo function

C

560 - Helium pollution prevention

C

570 - Date - Time - Language - Unit

C

580 - Fault / information indicator and display

D

D 100 - T D 200 D 300 D 300/D 400 D 400

able of

preventive maintenance

-

Maintenance message

-

General

-

Symptoms

troubleshooting

-

General

description

E

100 - Maintenance operations introduction

E

110 - ASM 142 / ASM 142

E

111 - ASM 142 D - ASM Graph D+ - Access

E

120 - Sending the leak detection for reparation to a

E

400 - Basic maintenance

E

530 - Valves

E

560 - Replacement

E

600 - Remote

E

610 - Long

E

710 - Primary

E

730 - Starting of the

E

740 - Greasing

E

750 - Primary

F

000 - Spare

F

001 - AVTF Customer Service

F

100 - T

F

200 - Monitoring and display

F

300 - Power and electrical supply

F

400 - Automatic control

F

500 - Measurement

F

600 - ASM 142 - Pumping

F

600 - ASM 142 D - Pumping

F

700 - Valves

F

800 - ASM 142 - Pipes - Connections - Seals

F

800 - ASM 142 D - Pipes - Connections - Seals

F

900 - Cover

F

1000 - Options - Accessories

F

1100 - Pictures

Alcatel Vacuum Technology France - User’s

installation and maintenance

of the internal calibrated leak

control

distance sniffer probe and Helium spray gun

pump

maintenance (AMD1) molecular

molecular

pump maintenance

parts instructions

ools

of components

guide

troubleshooting

S -

Access

of the analyzer cell

and

turbomolecular

and

turbomolecular

of use

Offer

system

and

electronic

Manual ASM

MAINTENANCE - TROUBLESHOOTING

intervals

guide/Symptoms description

MAINTENANCE

to internal components

to the internal components

service

center

pumps

SHEETS

COMPONENTS

circuits

142/142

D - ASM

GRAPH/GRAPH D/GRAPH

D+

M

anual reference

: 107817

ASM GRAPH D+: L0114

v3.1 r

.02

General

contents

ASM

142 -

ASM

142 D

D

ASM GRAPH

D+

User’s

Manual

GB 00205 -

Edition

07 - March 09

e

dition

:

07 - March 2009 Software version: ASM

142/ASM GRAPH

L

0088

v3.1 r

ASM

142 D/ASM GRAPH D/

Alcatel Vacuum Technology France - User’s

:

.02

Chapter

ASM GRAPH - ASM GRAPH

G APPENDIX

G 100 - Declaration of G 200

-

ASM 142 - Wiring

G 201

-

ASM 142 D - Wiring

G 300

-

Analog

G 400

-

Long

distance sniffer probe

G 500

-

Helium spray gun

G 600

-

Safety

G 800

- Tools

Indicates

confor

mity

output

questionnaire

diagrams

user manual

diagrams

user

manual

a potentially hazardous situation which, if not avoided,

could result in property damage.

CAUTION

Indicates could result immoderate or minor injury. It may also be against unsafe practices.

Indicates could result in death or

a potentially hazardous situation which, if not avoided,

used

to alert

a potentially hazardous situation which, if not avoided,

severe

injury.

Indicated an imminently hazardous situation that, if not avoided,

W

ARNING

Manual ASM

will result in death or

142/142

D - ASM

GRAPH/GRAPH D/GRAPH

severe

injury

(extreme

D+

situations).

3/3

Introduction

A

ASM

GRAPH

- ASM

GRAPH

D

GB 00206 -

Edition

03 -

June

08

Preliminary

remarks

ASM 142 - ASM 142 D

ASM

GRAPH

D+

Detailed contents

Throughout

“Summary of screen User’s

this

Manual.

User’s

Please

Manual, you could find this type of message

read it for further information.

C

140”: it

User’s

refers

to a specific chapter of the

Manual

A 100

-

A 200 ASM 142 -

A 201 ASM 142 D -

A 202 ASM 142 Graph D+ -

A

300

A

400

A 401 About Helium and hydrogen

A 500 Operator interface : control panel

A new generation of Adixen helium leak detector

-

Vacuum

-

Stand-by

-

Roughing

-

Gross leak

-

Normal

-

Sniffing

-

Vacuum

-

Stand-by

-

Roughing

-

Gross leak

-

Normal

-

Sniffing

-

Vacuum

-

Stand-by

-

Roughing

-

Gross leak

-

Normal

-

Sniffing

-

Description

-

Design and manufacture

-

Overview

-

Helium

-

Spray method (inboard testing)

-

Sniffer method (outboard testing)

-

Bombing method

-

Helium

-

Helium and leak detection: which purity?

-

Hydrogen

circuit

mode

test

mode

test

mode

test

mode

circuit

mode

test

mode

test

mode

test

mode

circuit

mode

test

mode

test

mode

test

mode

concentration

and signal displayed

Introduction

Detector

Analyzer cell

to the ASM 142 series

operating principle

operating

principle

T

esting methods

1/2

Introduction

A

ASM

GRAPH

- ASM

GRAPH

D

GB 00206 -

Edition

03 -

June

08

ASM 142 - ASM 142 D

ASM

GRAPH

Detailed

D+

contents

User’s

Manual

A 600 Options

-

Which options for which model?

-

Metal

seals

-

Inlet port

-

Units

-

Languages

-

3 masses

-

Automatic

-

Roughing system

-

Interface

-

Remote

- Test

-

Stainless steel

-

Control panel with graphic interface

-

Control panel racks

-

Sniffing

-

Cables

test

chambers

board

control cable length

of gas

line

cover

lengths

(UCT)

A 700

-

Which

-

- Transport

-

- Test

-

accessories

Remote

control Long Distance 10 m/30 feet

Headphone

cart Foot pedal for cycle Calibrated Helium leaks

Calibration Spray probe

Inlet adaptor Printer Inlet filters Short

distance sniffer probe (to be

Bombing chamber

chambers Neutral gas vent line kit 4 swiveling Covered sniffer probe and Bottle

handle for cart

Built-in

mini-printer

2005 IS

Pressure measurement

Ventilation

Bottle

Pump

Kit

handle for cart

for which model?

Sniffer probe LDS

extension

connector

command

accessory

wheels

kit (Ø125 mm)

kit

(1.5 m/5 feet)

connected

remote

control kit

to the inlet part of a leak detector)

Accessories

A 800 ASM 142 - Technical characteristics

2/2

A 801 ASM 142 D - ASM Graph D+ - Technical characteristics

A 900

A 901

Dimensions

- ASM Graph D+

A

100

x

GB 00207

-

Edition 04

- June

08

A new generation

Adixen helium

Model photographed: ASM

142

of

leak

detector

Introduction to the ASM 142 series

The

ASM

142/142 D/142

ASM

Graph D+ are

performance standards

These detectors utilizing the make them

high

performances, such a roughing capacity of 7 CFM (60 l/mn) with a usable helium sensitivity sec range.

high

a dry roughing capacity of 0.9 CFM helium sensitivity atm.cc/sec

a

in the 10 auto-zero



with two for the operation of the unit, the parameters).



operator in his daily (auto-calibration, helium ...).

very rugged

field-proven components, makes environment.



reinforce product (remote control, probe).

totally dry leak detector. specific to sniffing

applications.

graphic interface.

in the

performances, such

(1.5 m3/h) with a usable

range.

usable helium sensitivity

-7

atm.cc/sec

function).

comprehensive

distinct

other

for

evolved features

signal direct readout,

it ideal for any industrial

various accessories

the

We your

are the

latest electronics technologies

a truly

-11

10

in the 10

range (with

control panel

areas (one

entering

to assist

operation

auto-zero,

design, based on

versatility

suggest

detector

complete

universal helium

universal

as,

atm.cc/

as,

-11

the

test

the

which

to

of the

sniffer

test mode

that you read this manual before you start to use

satisfaction.

S/ASM Graph/ASM Graph

leak

detectors

for

multi-purpose

end-result

of an

unit.

innovative engineering

and

unit:

ASM

142

x

to obtain optimum

ASM

Graph

ASM

142 D

x

levels

which

vacuum concepts,

ASM

Graph

x

of

performance

D/ set

new

approach

which

ASM

D

142 S

x

ASM

Graph

D+

x

and

1/1

A

200

ASM 142 detector operating principle

GB 00208

-

Edition 03

- June

08

Vacuum

circuit

1

2

V

T3

18

V

C

V

T2

V

S

8

4

3

VA1 7

R1 VR2

V

5

15

VT1

Bacosol

Minisol valves

valve

Reference correspondence between valve/vacuum block marks

1 Preamplifier

2 Analyzer cell

3

Detector

inlet port

4 Internal calibrated leak

5 Inlet

pressure

gauge

7 Vent connector

Long

8

15

18

distance sniffer connector

Roughing

primary pump

Detection molecular

(RVP

20 0)

pump (AMP

007I)

A1 Inlet vent valve (6 points)

V

R1

V

R2

V

T1

V

T2

V

T3

V

S

Sniffing valve (9 points)

V

C

Calibration valve (7 points)

Roughing

Exhaust

Detection

valve ( point)

valve (2 points)

valve (3 points)

valve (4 points)

valve (5 points)

E

530

/4

A

200

ASM 142 detector operating principle

GB 00208

-

Edition 03

- June

08

(Patm

Stand-by mode

Roughing

mode

to 10 mbar inlet

18

1

2

3

VA1 7

V

T1

15

3

pressure)

2/4

15

5

V

R1

VR2

A

200

ASM 142 detector operating principle

GB 00208

-

Edition 03

- June

08

Gross

leak

test

(10 mbar to

5x10

inlet

-1

pressure)

mode

mbar

1

2

18

3

VR1

VR2

5

VT1

15

V

3

T3

1

2

Normal

(lower than

5x10

test

-1

mode

mbar

18

VT1

VT2

5

inlet

pressure)

15

3/4

A

200

ASM 142 detector operating principle

GB 00208

-

Edition 03

- June

08

Sniffing

test

mode

1

3

2

VA1

7

18

8 V

S

4/4

VT1

15

A

201

ASM 142 D detector operating principle

GB 01476

-

Edition 03

- June

08

2

Analyzer cell

V

Roughing

valve (1 point)

3

Detector

inlet port

V

Roughing

valve (2 points)

4

Internal calibrated leak

V

Exhaust

valve (3 points)

V

Detection

valve (4 points)

Vent connector

V

Detection

valve (5 points)

8

Long

distance sniffer connector

V

Sniffing valve (9 points)

10

Outlet pump connector

V

Calibration valve (7 points)

15

Roughing

pump (AMD1)

16

Roughing molecular

pump

18

Detection molecular pump (AMP

007I)

Vacuum

circuit

18

8

V

S

1

2

V

T3

V

C

4

V

T2

VT1

3

VA1 7

V

R1

5

VR2

15

10 12

16

Bacosol

valve

Minisol valves

Reference correspondence between valve/vacuum block marks

E

530

Preamplifier

1

Inlet

Purge

(MDP

pressure

filter

5006 HDS)

5

7

12

gauge

V

A1

R1

R2

T1

T2

T3

S

C

Inlet vent valve (6 points)

1/4

A

201

ASM 142 D detector operating principle

GB 01476

-

Edition 03

- June

08

Stand-by mode

1

2

18

V

T1

3

VA1 7

(Patm

Roughing

mode

to 10 mbar inlet

16

pressure)

16

15

3

5

V

R1

VR2

2/4

A

201

ASM 142 D detector operating principle

GB 01476

-

Edition 03

- June

08

18

1

2

V

T1

VR1 VR2

3

5

Gross

leak

test

mode

(10 mbar to

5x10

-1

mbar

inlet pressure)

16

1

2

V

T2

15

3

18

test

Normal

mode

(lower than

-1

5x10

inlet

mbar

pressure)

16

V

T1

T3

V

15

5

3/4

A

201

ASM 142 D detector operating principle

GB 01476

-

Edition 03

- June

08

Sniffing

4/4

test

mode

1

2

18

V

S

8

V

T1

16

15

3

VA1 7

A

202

principle

GB 03710

-

Edition 01

- June

08

2

Analyzer cell

V

Roughing

valve (1 point)

Detector

inlet port

Roughing

valve (2 points)

4

Internal calibrated leak

V

Exhaust

valve (3 points)

5

Inlet

pressure

gauge

V

Detection

valve (4 points)

Sniffing valve (9 points)

10

Outlet pump connector

V

Calibration valve (7 points)

12

Purge

filter

15

Roughing

primary pump

(ACP 15)

Detection molecular pump (AMP

007I)

ASM 142 Graph D+ detector operating

Vacuum

circuit

18

8

10 12

V

S

1

2

V

T3

V

C

4

V

T2

VT1

15

16

Reference correspondence between valve/vacuum block marks

3

VA1 7

R1

V

5

VR2

Bacosol

valve

Minisol valves

E

530

Preamplifier

1

3

Vent connector

7

Long

8

16

18

distance sniffer connector

Roughing molecular (MDP

5006 HDS)

pump

V

A1

R1

V

R2

T1

T2

V

T3

V

S

C

Inlet vent valve (6 points)

Detection

valve (5 points)

1/4

A

202

principle

GB 03710

-

Edition 01

- June

08

ASM 142 Graph D+ detector operating

Stand-by mode

1

2

18

V

T1

Roughing

(Inlet pressure:

mode

Patm

16

15

to 10 mbar)

16

2/4

15

3

VA1 7

3

5

V

R1

VR2

A

202

principle

GB 03710

-

Edition 01

- June

08

5

ASM 142 Graph D+ detector operating

18

16

18

16

1

2

V

T1

2

V

T1

3

VR1 VR2

15

3

V

T2

V

T3

15

5

3/4

Gross

leak (Inlet

test

pressure:

10 mbar to

5x10

-1

mode

mbar)

Normal

(Inlet pressure:

than 5x10

test mode

lower

-1

mbar)

A

202

principle

GB 03710

-

Edition 01

- June

08

ASM 142 Graph D+ detector operating

Sniffing

4/4

test

mode

1

2

18

V

S

8

V

T1

16

15

3

VA1 7

A

300

Analyzer cell

operating principle

GB

00007

-

Edition 03

-

September

04

Description

The

analyzer

cell works on the principle of mass spectrometry and is

set to the mass of helium (m/e =

4).

m/e

= atomic mass of the

ionization

particle/number

of electrons lost

on

The principle of magnetic deflexion spectrometry is as follows. The neutral molecules of the gas being chamber beam

(or source of ions) where they are

generated

by

a heated

molecules are transformed into

analyzed

tungsten filament. A

ions.

pass into an

bombarded

large

ionization

by an

electron

number of the

�

He

�

He

��

6

Leak Signal

��

�

��

He

��

Analyzer cell

-

functional

diagram

1/3

A

300

Analyzer cell

operating principle

GB

00007

-

Edition 03

-

September

04

Description (continued)

These ionized particles are

accelerated

by an electrical

field.

The entire property of deflecting the trajectories of the ions along different according to their different masses, is divided into several only ions with the same separated ions (N2+ or

analyzer

to the masses of those ions (to be more

m/e

ratios). Thus the ions

cell is subject to a magnetic field which has

precised, according

beam,

m/e

ratio. The helium ions (m/e = 4)

which

beams,

contained

each

from the lighter (H2+ or H1+, smaller beams) or

O2+,

small

beams).

ions with

containing

heavier

the

curves

are

Because there is a constant magnetic field accelerator = 4) follow

electrical field is adjusted so that the helium ions

a pre-determined

trajectory (passing through

and arrive on the target at the input to

(permanent

a

direct current

magnet),

(m/e

diaphragms)

amplifier.

the

The current of helium ions is helium in the installation and by measuring it we can find the flow rate of the leak that has been

proportional

detected.

to the partial pressure of

It

is essential that the total pressure in the

-4

10

mbar, so that the trajectories of the electrons and the ions are disturbed by residual Around

-3

10

mbar there is a risk of

molecules.

analyzer

damaging

cell is less

the

heated filament.

than

not

In order to «stray ions», an electrode located in front of the target the

secondary

«braking electrode».

separate

ions with low

the helium ions from «noise» caused by

eliminates

energies.

This electrode is called

the

There is an auxiliary electrode at the top of the cell, a

plate, which collects the ions that are heavier than helium. This

electrode thus

measures electrode serves as the plate for «triode

2/3

electrode».

the total pressure in the

a

triode

gauge,

shaped like

analyzer.

This

hence its name of

A

300

Analyzer cell

operating principle

GB

00007

-

Edition 03

-

September

04

Design

manufacture

and

Great care has been taken with the design and manufacture of the cell in order to and to achieve excellent stability: – the metal parts are made of stainless – the filament holder is made of – there is an integral

repeatedly

amplifier.

obtain the same

steel,

machined aluminium,

characteristics

The cell assembly is

a

vacuum

– – an optic holder

a permanent magnet,

–

amplifier.

– an

chamber

composed of:

or deflection

flange,

chamber,

•

The vacuum The analysis cell vacuum hollow with (that are installed on the «optics holder» flange) are

chamber:

a rectangular opening

chamber

is made of light alloy.

into which the

electrodes,

placed.

It

is

•

The optics holder The optics holder flange supports all the electrodes and connections in the cell. They – the sealed power supply socket, mounted on – the amplifier, mounted on an elastomer vthe supporting block which screens the target and on which source of ions is – the source of ions, which is made up of 2

• a

filament

•

an ionization

and a mass ion emitter.

holder,

flange:

mounted,

chamber

include:

with a stainless steel electron

gasket,

par

a

ts:

metal

electrical

gasket,

the

collector

The filament holder with respect to the ionization

mechanically

chamber.

positions the tungsten filament

The electron collector and the filament have been and positioned so that the stabilizes at filament. The cell is thus the pieces being tested without the need of any special system.

400°C

under

temperature

bombardment

rendered

of the electron

and

immune to

designed

collector

radiation

contamination

from

heating

the

from

3/3

A

400

T

esting methods

GB

00008

-

Edition 05

-

February

02

Over

view

Leak detection is used to detect

micro-openings, parts. The detection of these cracks involves the use of gas, which is

capable

of infiltrating the smallest leak quickly: Helium.

porosities, etc. in test

a

light

tracer

The detector samples and measures the helium flow rate entering test part via the

leak(s).

the

The testing method is selected measurement accuracy required:

no

The part can be

connected to

The part is

sealed

an evacuation line

yes

Its

characteristics

allow it to

evacuated

be

yes

10

-1

mbar.

SPRAY

laeak rate to locating the

method

measurement

l/s

and possibility of

leak.

from

10

-10

no

Minimum mbar.l/s the

Its

characteristics

allow it to pressurized or

a

mixture

helium

SNIFFING

detectable

and possibility of

leak.

with helium

containing

yes

method

leak of

be

locating

according

-6

10

to the test part and

Its

characteristics

allow it to be

in

a vacuum

vessel

BOMBING

The sensitivity is limited by internal dead well as on the bombing time and pressurization value. Global test without possible of the

leak.

volume of the part

the

placed

yes

method

the

location

as

the

1/4

A

400

T

esting methods

GB

00008

-

Edition 05

-

February

02

Helium

and signal

(inboard testing)

2/4

concentration

displayed

Spray

method

Response time

In leak

accordance

detection,

to the He

the signal

concentration

displayed

will

rate in the gas used for

change.

Example: signal

100

(with

% He in the gas

Signal

displayed

on the leak

This involves removing air from the test part, analyzer

detector

and then

He

The part is

% He)

used

Global

part

placed

displayed

connected

1x10

spraying

test

under

with

a 1x10

to the detector inlet.

100 % 10 % 1 %

-7

mbar

.l/s

helium over the outer sur

detector

a cover, into which helium is injected.

The leak cannot be

located.

The detector measures the flow of helium

When on the there is

spraying

analyzer:

a response

starts, the leak signal is not

time which

depends and the helium pumping speed S of the system at the part,

according

T

= V/S

T

is the time required for the signal to reach 63 % of the final

to the following

(T

in

seconds,

relation:

V in litres, S in

-7

mbar.l/s calibrated leak

1x10

-8

mbar

.l/s

connecting

Spray

or

probe

spray

He

Potential leaking sprayed

The leak can be

on the volume V being

with

penetrating

displayed instantaneously

l/s)

face.

test

part

helium.

located.

the

opening

the

-9

1x10

mbar

it to

the

detector

areas are

part.

tested

of

value.

.l/s

the

A

400

T

esting methods

GB

00008

-

Edition 05

-

February

02

Sniffer

(outboard testing)

method

The test part is Distance Sniffer)

pressurized

probe,

samples the helium

with helium. The detector, via an

escaping

from the

LDS

part.

(Long

Global test

or

He

The part is

part

LDS

placed

detector

under

a cover containing a sniffer probe.

The leak cannot be

The helium from the accumulates over time inside cover. The detector the

concentration

located.

leak

measures

of

helium.

the

Local sniffing

He

part

LDS

test

detector

The sniffer probe is moved areas

The leak can be

The signal supplied by analyzer measurement The sniffer probe only part of the helium from the part. The depends separating of the

likely to contain

located.

is not

a direct

of the

leak.

escaping

sample

on the

distance

the leak from the tip

probe.

leaks.

the

samples

over

3/4

A

400

T

esting methods

GB

00008

-

Edition 05

-

February

02

Bombing method

This method is used for sealed objects that cannot be directly to the detector

(semiconductors, waterproof watches, etc.).

connected

He

The part is

placed

part

Chamber 1

in

a chamber

part

Chamber

containing

2

pressurized helium.

He

detector

The helium

The part is then removed from the vacuum escapes

penetrates

the part if it has

a leak.

chamber

which is

connected

to the detector. The helium

from the part through the leak and

and

placed

in

another

produces a signal.

This signal is not a direct pressure inside the part is difficult to important part such as: the pressure, the internal volume, the

4/4

measurement

determine.

pressurization

aeration

of the leak as the helium

Several parts play

time, the helium

bombing

time, the size of the

leak.

an

A

401

About Helium and hydrogen

GB 02760

-

Edition 02

- June

08

Helium

Helium is the representing other

elements represent

second most common element

about 23 % of the total matter. 76 % is Hydrogen.

an insignificantly small fraction of the total.

in the universe,

All

Helium was 18, 1868. element

common

very is actually not abundant. during the formation of earth escaped to space. Helium is created, deep in the earth from the radioactive decay of Uranium and Thorium which also discovered volcanic

spectrum

the

discovered

The

discovery in the

its name: “helios” in Greek

in the

generates in 1881 by

gases emanated

as already known from the sun.

by

spectroscopy

sun’s chronosphere

universe most

Since

the earth its internal heat. On earth Helium was

spectroscopy

by the mountain showed the

of it is in the

it is so light all the Helium present

in a solar eclipse on August

gave the new

means

“sun”. While Helium is

stars:

of Mount

Vesuvio

on earth it

in Italy – the

same

lines in

Helium of Krypton and 60 are isolated from air by liquefaction and rectification as a contrary is “extracted” from natural gas and oil wells. Helium comes annual world wide production is ca. 3x10 4,500 tons.

concentration

up with the natural gas and is separated and stored. The

in the

times

atmosphere

higher than

is 5

times

Xenon. The

7 m3

bigger than the one

heavier noble gases

process.

or

Helium

Helium is is so light that other hand there is a to earth. world wide

constantly

This

gives a dynamic equilibrium and is the reason for the

constant concentration

seeping up from the ground all around us, but it

almost

all of it constant

escapes

flow of Helium from space and the sun

into space fairly rapidly. On the

of ca. 5 ppm Helium in

air.

Helium is a very light gases;

it is the

most

colorless element

difficult gas to liquefy.

and it is one of the six noble

Helium is a noble gas, which all practical protect things from oxidation – and of gas.

intents

and

means

purposes. It’s used

it doesn’t react with anything for

course

as an inert shield gas to

as leak detection tracer

Helium is a 100 % green gas and has impact on the atmosphere.

absolutely

no environmental

1/2