 |
 |
|
Specimen
Punch Model 220 Low-Temp Container Model 140 Digital Power Control The selectable mode feature of the Model 140 provides the user with a high degree of flexibility. Two independent 3 position switches, one for the Pump Select and one for the Polish Select determine the mode of operation. The function of both switches is to enable or inhibit the photocell shutoff circuitry. With the Pump Select switch in the Auto mode, the photocell circuitry immediately stops the electrolyte flow at the first sign of light penetration through the specimen. In similar fashion, the Polish Select switch stops the polishing current at light penetration while in the Auto mode. With the Pump Select switch in the Continuous mode, the pump remains activated after the light has penetrated the specimen and the photocell circuitry has activated the alarms. This feature allows the polishing time to be extended past the point of a small perforation in the specimen. The Polish Select switch is also used to control the light source. In the Auto and Continuous modes, the light source for the photocell circuit is illuminated. In the “Off” position, both the light and the polishing current are off, allowing for easy set-up of the Model 110 Electropolisher. The photocell circuitry is designed to detect the first sign of light penetration through the specimen. When this occurs, independent of the position of the Pump and Polish Select switch, both an audible and visual alarm are activated. A sensitivity control adjusts the amount of light required to activate the photocell shutoff. An Alarm Silent switch enables the audible alarm to be silenced while the alarm light remains illuminated.
|
|||||||||||
The
Low-Temp Container is designed for use with Model 110 Twin-Jet Electropolisher
for applications at cryogenic temperatures. Cooling is accomplished
via conduction from a cooling media such as liquid nitrogen and
methanol to the electrolyte contained in a glass dish. The dish
is supported in the Low-Temp Container while being surrounded by
the cooling media. Double wall, heavily insulated construction maintains
temperature during the electropolishing process. For temperature
monitoring, a hole is provided in the top plate for easy thermometer
access. The one-piece Low-Temp Container is manufactured entirely
from electrolyte resistant materials. 
The
Model 140 is specifically designed for use with the Model 110 Twin-jet
Electropolisher for electrolytic polishing or etching of specimens
for Transmission Electron Microscopy. It controls the electrolyte
flow, polishing voltage and current, the light source and photocell
shutoff circuit, and includes visual and audible alarms. Digital
displays allow for precise setting and reading of the electropolishing
voltage and current levels. The voltage can be varied between 0
and 120 volts, while the polishing current range is 0 and 100 mA.
