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new
feature
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details
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Coldhead and
Transfer Line
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Transfer
Line
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The
Transfer Line from the Dewar to the Cryostream Coldhead is about 30 cm
longer. This is split between the flexible line (now 1500mm) and the rigid
Dewar section (now 900mm). This means the Cryostream can now be run with a
greater variety of Deware vessels.
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More
Options in Set up
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The
Transfer Line is longer and exits the Cryostream Coldhead at 90°. This
reduces the need for the Dewar to be raised off the ground. This is ideal
for more awkward, non-standard laboratory set-ups or where the x-ray beam
is quite high.
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Longer
Running Time
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The
FLOW tube of the heat exchanger in the Cryostream Coldhead is now twice
the cross sectional area. This will increase continuous run time by more
than four times.
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Improved
Vacuum Lifetime
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The
Pumpout Port has been relocated near to the Coldhead to reduce the
likelihood of damaging the vacuum insulation when refilling.
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New
Gas Heater System
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The
heater and sensor probe has been removed from the nozzle of the Cryostream
to improve the robustness of the nozzle and Coldhead. The gas temperature
at the crystal position is now controlled in a unique way. The gas
temperature is controlled in the Coldhead and the temperature is
‘mapped’ to the crystal position. This means we are showing the
temperature at the crystal rather than the temperature somewhere close to
the crystal position.
Because
we map the crystal temperature taking into consideration the temperature
changes due to flow rate, there is no need to worry about an 'off-set' of
temperature at the crystal. So, what you see on the Controller is the
temperature at the crystal and there is no need to add some difference to
the value on the Controller as is the case with many systems. What you see
is what you get!
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Improved
Laminar Flow System
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With
the heater and sensor removed from the nozzle, the laminar flow system is
improved. This reduces the possibility of icing and improves the cooling
ability of the stream.
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More
Versatile Coldhead Orientation
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The
new robust nozzle lends itself to being orientated at any angle. This is
highly desirable for setups such as the inverted phi axis where it is
necessary to also invert the nozzle.
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700 Series
Temperature Controller
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Smaller
and Lighter
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The
700 Series Controller has an all-new enclosure with a small footprint. (LxWxHmm)
287 x 244 x 135
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Microprocessor
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The
Controller is fitted with a Hitachi microprocessor with software written
in C++ with 64K ZIF socketed EPROM for easy upgrade of software.
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User
Friendly Front Panel
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The
Controller interface has been improved making it faster and more simple to
operate. Easy to read back lit LCD panels create a larger viewing angle.
‘Digi-Pot’ technology allows rapid input of phase information and
scrolling of the information displayed on the LCD panels. Audio output
makes for positive feedback from the Controller's keys and other controls.
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New
‘Fast Start’
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The
‘Fast Start’ facility means the Cryostream Cooler can be started by
just switching on and pressing START. This means it is quicker to reach a
required temperature without the need to enter complicated programming
steps. Programmability is still retained when needed.
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New
COOL function gives faster cool down
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This
new function draws liquid from the Dewar at a higher flow rate to cool the
Coldhead quickly. This is very useful where time is important, eg. Beam
lines. The Cryostream can reach 100K in 20 minutes from warm, an
improvement of more than 20 minutes.
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Electronic
Flow Controller
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This
unit measures and controls true mass flow and automatically compensates
for back pressure in the system.
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Variable
Flow
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The
Controller now has variable electronic flow of 5 and 10 litres / minute.
This is controlled with the use of a TURBO button on the controller and is
useful when higher flows are needed.
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Digital
Real-Time Flow and Pressure Display
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The
Controller is now fitted with a digital real-time display of mass flow and
back pressure.
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Increase
Operating Temperature
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The
operating temperature has been increased by 25K to give a range of 80K to
400K.
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Improved
Computer Interface
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Improved
computer interface providing more information and control through the
serial port. Microsoft Windows Remote Panel offers improved remote
operation and data logging.
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‘K
/ °C / °F’ button for changing units
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The
indicated units used by the Controller can now by changed from Kelvin to
Centigrade or Fahrenheit at any time during operation. This not only
change the gas temperature readout, but also all the temperature values.
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Program
Storage
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The
E2PROM allows customised phases to be stored and retrieved so
complex programs can be saved for future use.
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New
Heater Controls
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The
Controller is now fitted with Pulse Width Modulated control of heaters.
This is over 90% more efficient so less heat is generated in the
Controller. Three heaters and sensors allow for the compensation of any
small thermal imbalances.
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Improved
System Management
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The
Controller now benefits from advanced System Management. By automatically
logging the run-time, the Controller can now display system maintenance
requirements.
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Better
System Protection
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'Brown-out'
detection - Controller is able to detect power losses enabling continuous
running through mains power fluctuations and allows for controlled
shutdowns.
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Other System
Improvements
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New
Teflon tubing improving the dryness of the nitrogen gas
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This
tubing is 70 times less water absorbent than the current tubing. This
increases the continuous run-time of the system.
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New
Coldhead Support Stand with Multi-Axis Positioner
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The
Varibeam Coldhead Support Stand has been modified to include two
additional axes of translation as well as the existing translation. These
new translations can be fitted to existing Varibeams.
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Optional
Auto-Refill System
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The
700 Series is now available with an optional Liquid Level Controller. This unit comes with a
customised Dewar Cap Assembly for the ES-60 Dewar, discrete sensors to
control the level of liquid in the Dewar, transfer line and solenoid
valve.
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New
Diaphragm Pump
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In
order to improve the reliability and lifetime of the pump parts, the
system will by shipped with the newer 917 Diaphragm pump.
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