Extremely Low Gradients
Sigma thermal platforms (hot/cold plates) deliver extremely low gradients and high performance. Sigma uses a high density array of ultra linear electric resistance heater to provide smooth and fast heating. Sigma's proprietary expanding cross section inverted double helix design cooling channel is milled directly into the platform to eliminate cross boundary heat exchange issues. This design provides outstanding cooling efficiency, extremely low gradients, and prevents the formation of dry ice blockages when using L-CO
2
.
Control Flexibility & Accuracy
All Sigma Systems thermal platforms are provided with the Model C analog controller.
At the time of order you can opt for the Model C4 programmable controller.
The Model C controller is the essence of reliable simplicity. Simply set the
temperature and turn it on.
The Model C4 includes digital readout with .1 degree resolution, a full
tactile keypad, multi program programmability with up to 100 program steps,
remote control via RS-232 or IEEE-488, temperature averaging from two
inputs, °F and °C modes, and more.
All Sigma controllers have provision for staged heating and lead
proportional lag damping (PID) control based on input from 500 ohm Pt RTDs
for the most accurate temperature control with minimal overshot. Internal
control resolution is better then .05°C with operating stability within .1°C
and .7°C accuracy. These controllers are immune to voltage fluctuations of
up to 20% of rated line voltage. Opto isolation and zero crossing switching
is used to reduce noise.
Click here to learn more about Sigma Systems controllers
Quality Construction
Every Sigma Systems platform is carefully hand built by experienced
craftsmen using only the best available materials to execute our carefully
engineered designs. Shortcuts are never taken, details are always a concern.
These are just some examples of the quality that is integral to every Sigma
platform:
- Stainless steel construction for corrosion resistance.
- Exterior cabinets made of spot welded cold rolled steel with TIG welded and
ground corners for strength and quality appearance.
- Extra tough epoxy powder coated exteriors for easy cleaning and exceptional
heat and abrasion tolerance.
- Low k factor, high heat tolerant, insulation for greater efficiency and long
service life.
- Custom made solenoid valves with specially sealed coils and valve/seat
assemblies designed for long life in extreme conditions.
Failsafe
All Sigma platforms are supplied with an adjustable independent bi-metallic
over temp power lockout system. This provides highly reliable protection
against over temp conditions. Additional precision failsafe systems are
available to protect against both high and low out-of-range conditions.
