Sigma has been making Temperature Chambers for over 50 years, in that time we have made thousands of chambers for hundreds of companies, each with special needs and unique specifications. As a result we have made chambers of nearly every imaginable size, shape, and variety - with custom options to fit every need. With this background we are confident that we can meet your needs. Listed here are the most requested options and accessories, if you have needs beyond the items listed here please contact us. Choose from the text list below, or browse the photo list
|Apertures, or "ports" in the chamber walls are the most popular option for Sigma chambers. The least expensive apertures are round and are available in standard sizes from 1 1/4" to 4" (I.D.). Larger, smaller and custom sizes are available. Square or rectangular apertures are also available. If you move loads attached to wiring, hoses, etc. in and out of the chamber often, the best option if often a "notch" at the front door edge of the working cavity where the door closes. Door notches (see below) allow loads to be moved into or out of the chamber without detaching having to release connections.|
|If you move loads attached to wiring, hoses, etc. in and out of the chamber often, the best option if often a "notch" at the front door edge of the working cavity where the door closes. Door notches allow loads to be moved into or out of the chamber without detaching having to release connections. Door notches make it easy to load a configured and "wired" DUT (Device Under Test) into and out of the chamber. The ability of load and unload fully configured DUTs is not only a convenience, but a health and safety benefit as well, as operators don't have to spend time bent over with their head in a chamber while attaching cables, pipes, or monitors to the DUT.|
|Feed-throughs or cable Feed-throughs are small apertures, usually 1/2" or smaller, and are generally located in the door of the chamber, and allow cables or wiring to pass into the chamber.|
|Windows can be added to chambers to allow observation of the test in progress. Sigma multi-plate insulated windows remain clear during test and resist temperature transfer from the interior to the exterior.|
|Interior lights make loading chambers, especially deep models, much easier. Lights are also the perfect companion for the door window option to allow excellent view-ability without having to open the chamber door. Interior lights can be controlled manually, by a door operated switch, or by program control using the Sigma C4 controller.
|A variety of shelf and shelf standard options are available. Standard optional shelving is rated for 200 lb. distributed load, but heavier shelving is available. Heavy loading capability is available to almost any standard. If you have exceptionally heavy loads, be sure to let us know when you order your chamber so that we can be certain to build in the strength you need.|
|Non-Conductive Shelf Insulators|
|These shelf insulators provide a non-conductive work surface for your chamber. They will withstand temperatures from -65°C to +120°C. They rest on top of the standard stainless steel shelves and have holes to allow conditioned air to flow around your DUT's. They are available for all chambers smaller than the M256.|
Coolant delivery hoses are used to connect your temperature chamber or thermal platform to your coolant source, be it a bulk system, a dewar, or a high pressure cylinder. Sigma offers Vacuum jacketed and Armored hoses for L-N2, as well as hoses for L-C02.
Getting the right hose, with the right fittings, in the right size, with the right insulation, with the proper safety facilities, is essential for a successful and safe operation. Sigma hoses come with the correct fittings for both the coolant source and the temperature chamber or platform. L-N2 hoses include a Safety Pressure Relief Valve.
|Cryogenic Hose & Dewar Accessories|
|Sigma offers a number of hose and Dewar accessories that improve safety and usability of Sigma chambers, including Safety Pressure Relief "T"s, 2 port "Y" Distribution Manifolds, Dewar Pressure Optimizers, 5 port Distribution Manifolds.|
|Custom Shapes and Sizes|
|If you require a special size or shape chamber, Sigma should be your first choice. We have been building custom chambers, as a normal part of our production routine, since our beginning. We are experts at helping you design the perfect size and shape chamber for your needs, and then delivering it quickly at a reasonable cost. We make custom chambers as a matter of routine, rather than as an occasional accommodation.|
|Smaller chambers can be stacked vertically to save space. To provide proper ventilation and a secure stack, add the Sigma Stacking Option. The option includes internal strengthening of the chamber for the additional load, special attachment points on the sides of the chambers, and spacer/attachment plate to secure two chambers together.
|Larger Sigma Systems chambers, M170M and larger, are normally supplied on a matching powder coated welded steel stand with a durable diamond plate shelf and casters. Smaller chambers are optionally available with stands in standard or custom heights. Stands can optionally equipped with racks, shelves, or bottle racks for CO2 siphon bottles. Stands may be equipped with "feet", or glides, as well.
|Precision hi-lo failsafes|
|Precision fail-safes are the appropriate way to to protect your valuable devices from mechanical chamber component failure or operator error. Two models are available, the PFS-1 screwdriver settable model and the PFS-2, digital switch settable model. In the event of an overtemp, or undertemp condition, the Precision Failsafe will discontinue all heating and cooling, while allowing the blowers to continue to circulate air, if desired.
|Redundant cryogenic coolant cut-off valve|
|The perfect companion for a Sigma Precision Failsafe is a redundant cryogenic coolant cut off valve. In the event of a Failsafe over or under temperature trigger, the redundant valve closes to shut off the flow of cryogenic coolant. This option is a must to protect from the possibility of a stuck open cryogenic valve during critical or unattended tests.
|Internal terminal block for wiring second probe inside chamber|
|A Sigma installed terminal block on the back wall of the chamber allows simple connection of second probe without the necessity to run probe wires outside the chamber and back to the controller. Terminal block is wired to the controller second probe input. Note: The addition of a second probe requires a controller like the C4/C5 that has connection and control for the second probe.|
|Second probe for direct product temperature sensing|
|A Sigma installed second probe allows the Sigma C4 controller to provide full benefit. The second probe can be used to measure the temperature of the UUT (unit under test), or two provide improved test accuracy and faster throughput with Sigma's exclusive "T-Drive" thermal overdrive software.
|One or two programmed external device controls|
|Models equipped with a Sigma C4 programmable controller may included one or two additional devices to be controlled by the controller. In addition, the controller features a single input that is useful for sensing the condition of an external switch or similar devices. C4 controller i/o ports are TTL. Sigma can provide as much customization of the devices attached to these ports as you require.|
|IEEE 488 GPIB, EIA(RS) 232 connector on front panel|
|Chambers with Model C4/C5 controller can be equipped with IEEE-488 GPIB or EIA (RS)-232 connectors on the front panel (or another location of your choice). These connectors extend the connector from the back of the controller where they can be difficult to reach to a more convenient location.|
|Wiring for non-standard voltage|
|Standard power sources for Sigma chambers is 120 VAC, 60 Hz, 1Ph (small models) or 208 VAC, 60Hz, 1Ph, or 240 VAC, 60 Hz, 1Ph. 208 VAC units are well suited to operate on non-U.S. 220 VAC, 50Hz, 1Ph. Other voltages, frequencies, or 3 phase units are available. Special wiring for any purpose is available to your specifications.
|Sound Attenuation for mechanical systems|
|The sound from chambers with mechanical refrigeration can be attenuated with a number of additions typically sold as a sound attenuation package. Part of the sound attenuation is achieved by setting the compressor unit to the rear of the compartment and then adding a sound wall between the compressor and front of the chamber. This wall and other interior walls are then coated with a thick sound deadening material to further reduce compressor noise. This design is particularly well suited to clean environments as the air intake is thus moved to the bottom of the stand and accumulated dirt on the condenser coils is not obvious.|
|Rack mount for smaller and custom chambers|
|Rack mounting is an option for all small Sigma chambers. Models M10, M18, M24M, M26, M35, M50M, M52, and M59 are all available with flanges for mounting in standard 19" or 24" racks as appropriate.|
|Extended Temperature Option|
|Standard temperature range for Sigma Systems test chambers is -100°C to +200°C. Thermal chambers ordered with the standard High Temp Option are rated from -100°C to +300°C. Low temperature options that will allow operation as low as -185°C and high temperature options that will allow operation at +350°C, or above, are available. These extended range temperature chambers are always designed for your specific requirements. Contact your Sigma Systems representative or sales engineer for more information.|
|Spare coolant solenoid valves and injectors|
Sigma uses custom designed valves and injectors to provide your chamber with extremely high performance, quiet operation, and long life. However, Valves are "wear" items and will eventually wear out. You can purchase spare coolant solenoid valves and injectors to avoid down time that could occur with a valve failure.
Valves are available as "Built-up" valves that are pre-assembled, insulated, and ready to install, or as simply valves.
|Dry Nitrogen Purge Systems|
|Dry Nitrogen purge systems are available for any chamber. Dry nitrogen purging is an outstanding way of eliminating moisture and/or oxygen from the test environment. Even Nitrogen cooled chambers can benefit from a dry Nitrogen purge as the purge can be used even while the chamber is heating. The purge can be provisioned for manual, door switch, or C4 programmable controller control. More on Dry Nitrogen|
|Card Slots are a specialized from of aperture, with a built-in gasket and shaped to fit PCB style cards and allowing the cards to be "live" while under test. Card slots are normally located in the door of the chamber.|
|Air Cooled Chambers|
|Chambers that will be operated above ambient, and that do not require fast ramp down rates, can be supplied with air cooling slots for cooling by exchange of ambient air. This option eliminates the need for refrigeration or cryogenic coolants, but does result in more room for heating than a cryogenically cooled model.|
|Water Cooling for Chambers|
|Chambers that do not require fast ramp down rates, can be supplied with water cooling by chilled water if your facility has water chillers. This option eliminates the need for refrigeration or cryogenic coolants.|
|Chart recorders are available for all models. We can provide an appropriate model for the need you describe, or a specific model if you have a preference. Chart recorders can be built into the chamber cabinet or supplied in a rack mount panel with, or without, the chamber controller in the same panel.
|Cryogenic coolant conversion kit|
|Chambers fitted from cryogenic cooling can be converted to another coolant by installation of a conversion kit available from Sigma. Sigma will need to know the model and serial number of the chamber to be converted, the coolant used now, and the coolant to be used after the conversion. All necessary valves, brackets, injectors, etc. are fully built up and insulated and ready for your installation.|
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Chamber options and accessories
How to Select the Correct Size Chamber
Chambers vs Platforms
Cryogenic vs Mechanical Cooling
Controllers and failsafes
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