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JM purchased one of these, trying to find more info on it. Should come with schematics

Filament

Trying to find replacement filaments. Takes the ISI three prong type

Prices as of 04/21/2014

Vendor Item # Description Price/pack Qty/pack Qty/each Notes
Ted Pella 1426 ISI / ABT / Topcon 3-pin 425.00 10 42.50
Electron Microscopy Sciences 81038
STANDARD LOOP FILAMENTS for: ISI Instruments, ABT, Topcon

New Filament, 3-prong
416.00 10 41.60
Electron Microscopy Sciences 81038-R
STANDARD LOOP FILAMENTS for: ISI Instruments, ABT, Topcon

Rebuilt Filament, 3-prong
1 32.00
SPI Supplies 5232N-BA Topcon/ISI 3-pin 525.49 10 52.55
SPI Supplies 5232RB-AB Topcon/ISI 3-pin (rebuilt) 1 41.57
EB Sciences ISIE Standard loop, 3 Prong 405.00 10 40.50
EB Sciences ISIE AR loop, 3 Prong 455.00 10 45.50
Fisher Scientific 50-290-87 NEW FILAMENT 3-PRONG 509.60 10 50.96
Soquelec A20135 ISI (2-prong, new) 1 68.10 NOTE: 2 prong for comparison
Soquelec A20140 ISI (2-prong, rebuilt) 1 39.00 NOTE: 2 prong for comparison
ME Taylor F-3 Topcon/ISI 3-pin style Filaments - Package of 10 275.00 10 27.50

EB Sciences

Has several filament types

Type AR

“The Energy Beam Sciences exclusive AR tip represents the state of art in filament technology. This special loop was developed for applications which demand the ultimate in mechanical stability and operating life. It is particularly recommended for use in multi-user environments and teaching laboratories. Its etched taper loop configuration and unique tip geometry enhance contrast and brightness, even at low kV. We can provide the AR loop mounted on any type of filament base. Whatever your application, you should see enhanced performance with the AR loop, when compared with the standard loop filament supplied by the EM equipment manufacturer.”

Standard Loop

“Energy Beam Sciences Standard Loop Tungsten Filaments are designed to conform to Original Equipment Manufacturers' specifications across the industry. Our filaments are individually manufactured with careful attention to detail, maintaining their precise tip geometry and using superior assembly techniques and stringent quality control for consistency and dependability in even the most demanding applications. At Energy Beam Sciences, we offer cost effective, reliable solutions for these and all of your EM consumable needs. Please call our e-Beam product specialist today to find out more about our quality products!”

JM electron gun

Original unit that SEM came with

Assembly:

apart1.jpg

Base it plugs into:

base.jpg

Taking off top retainer:

apart2.jpg

Removing the Wehnelt:

apart3.jpg

Note that the filament is slightly twisted to form the tip. Also, its burned out

Wehnelt bottom:

topbot.jpg

Side of the filament assembly

side1.jpg side2.jpg

Filament tip:

tip.jpg

Everything together:

apart.jpg

lapointe2

http://members.tm.net/lapointe2/scanning_electron_microscope.html

Great resource on this model. Unfortunately, links to pages are hidden throughout the text so I've tried to index it a bit better. I also have mirrored the site in case it disappears:

These are less about the SEM and more about his particular logistics:

Cleaning

Wenol metal polish recommended for cleaning. MSDS lists

  • Ammonia Solution 25%: 1-5%
  • Kerosene 200-230: 10-20%
  • White Spirit 150/200N: 10-20%
  • Aluminum oxide (pigments): 25-35%
  • Coco fatty acid diethanolamide: 5-15%
  • Water: 35%

https://www.tedpella.com/material_html/polish.htm#Anchor-47857

  • “Wenol® is widely used as cleaner and polish for electron microscope applications, ion beam systems, vacuum coating systems and general lab applications. Wenol® has been originally formulated for use on hard metal surfaces such as stainless steel. It can be used to clean and polish hard metal parts for vacuum systems. The carrier fluid dissolves in most hydrocarbons and is easily removed. Wenol® is petroleum based and does not contain silicones. It is not recommended for use on soft metal such as aluminum.”

Ted Pella also has Unipol…not sure when to use one vs the other. Generic Wenol?

  • Aluminium oxide: 20-40
  • Ammonia solution: 0.1-5
  • Destillates (petroleum), hydrotreated light: 20-40
  • Naphtha (petroleum), hydrotreated light: 2.5-10

read somewhere 100ml ~= 3.4oz Wenol

o-rings

Drawings in this section are from Lapointe's website

may consider replacing o-rings as the vacuum is sub-par. By the time I disassemble everything might as well replace them

“o-rings are labeled with their aerospace standard AS568A size”

High vacuum assembly

Abbreviations:

  • ID: inner diameter
  • OD: outer diameter
  • CS: cross section

What is difference between nominal and actual size?

AS568A size ID OD CS Qty
011 1
013 1
118 2
128 1
141 1
214 1
215 2
216 1
220 2
221 1
222 2
226 1
233 1

Valve assembly

AS568A size Qty
006 1
121 2
123 1

uccs.edu PES415

Has a sort of instruction manual: http://www.uccs.edu/~tchriste/courses/PES415/SEM.pdf

Units for sale with pictures

 
microscope/sem/isi/super_iii_a.1398150093.txt.gz · Last modified: 2014/04/22 07:01 by mcmaster
 
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