Temperature Chambers

The Bemco F Series of free-standing, mechanically cooled temperature chambers are offered in Wide Range, F Series (-73 C to 177 C or -100 F to +350 F) and Narrow Range (-35 C to + 177 C or -31 F to + 350 F).

These chambers feature innovative Bemco conditioning systems designed to provide a precisely repeatable environment for testing in accordance with Military Standards (MIL-STD's), production testing, and laboratory testing.

Features such as doors that step forward so that carts can be directly loaded into the workspace, plug doors to prevent warpage on the door face, dual gaskets to improve thermal gradient, and high volume air circulation are standard.

For "Code D," above, Exterior Height, add approximately 10 inches near the rear of the workspace for fan motors for the F27 and F64. All standard systems except the F64 have air cooled condensing on the refrigeration systems. F64 chambers have water cooled refrigeration systems.

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Conditioning

Chamber air is recirculated by a high volume, stainless steel axial fan discharging through a hinged rear mounted guard and diffuser baffle to create a uniform environment around your test objects.

The fan is driven by a vertically mounted motor with dual ball bearing races, connected by a large diameter extended stainless steel shaft. Fast-response open type heaters, located behind a radiation baffle, raise chamber temperature as required.

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Cooling, Wide Range

A proportionally controlled cascade, two compressor, refrigeration system utilizing modern environmentally friendly refrigerants cools the workspace. The system includes automatic hot gas bypass and suction cooling unloading as well as Bemco’s exclusive, high performance coaxial cascade heat exchanger.

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Cooling, Narrow Range

A proportionally controlled single compressor refrigeration system utilizing a modern environmentally friendly refrigerant cools the workspace. The system includes automatic hot gas bypass and suction cooling unloading.

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Safety Systems and Electrical Wiring

All systems have thermal and current sensors on the compressor, charging valves, and a sight glass as well as numerous safety and reliability protection systems for dependable operation. All electrical wiring meets the United States National Electric Code. UL and CSA approved components are used where possible.

An F27 model is shown. Notice that the the controls are located on the right side to prevent dripping on the control instruments when the door is opened

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Construction

All F Series chambers include a 304 Series stainless steel welded liner with high temperature fiberglass insulation. No asbestos is used in chamber construction. Outer cases are fabricated from cold rolled steel finished in Bemco Blue. Chamber doors feature Bemco’s plug door to minimize problems with expansion and contraction on the door face and dual gaskets to greatly reduce thermal losses near the door face. An over-center Bemco cam-type latch seals the door.

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Controls

Each Bemco chamber is furnished with a microprocessor based, programmable 1/4-DIN, solid state 256-step ramping controller which includes a 4-line LCD interface display and a large red LED display.

Temperature inside the chamber is sensed by a precision thermocouple. An RS232 and RS485 interface is standard. Heaters are interlocked with a separate heavy duty power contactor and a factory preset high temperature safety control.

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Thermal Performance

On Narrow Range Chambers (N), cooling rate from 23 C (+73 F) to -35 C (-31 F) is approximately 45 minutes, or 2 C (3.6 F) / minute. Average heating rate from 23 C (+73 F) to +177 C (350 F) is 3.4 C (6.2 F) / minute, both with the chamber empty.

On Wide Range Chambers, cooling rate from 23 C (+73 F) to -73 C (-100 F) is approximately 55 minutes, or 1.7 C (3.2 F) / minute.

Average heating rate from 23 C (+73 F) to +177 C (350 F) is 3.4 C (6.2 F) / minute, both with the chamber empty. + or - 1 C (+ or - 1.8 F) guaranteed control, + or - 0.15 C (+ or - 0.25 F) typical.

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Optional Equipment

• Window and interior light. Window sizes are 12” x 12” and 18” x 18” clear viewing area.
• Access Ports. Sizes are 2”, 3”, 4” and 6.” One 3” access port in the left wall is provided with each chamber.
• Casters, four swivel type.
• Shelf pilasters and wire-type stainless steel shelves.
• LN2 boost cooling with vent for extra or back-up cooling.
• GN2 gas purge with pressure regulator, gauge, flow measuring and regulating valved rotameter, and vent.
• Desiccant drier purge with dual tower 10 cfm desiccant drier, pressure regulator, gauge, flow measuring and regulating valved rotameter and vent.
• Two refrigeration gauges mounted in the refrigeration package available with or without isolation valves for single stage systems and four refrigeration gauges, two per compressor, for cascade systems.

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Optional Instruments

Controls are mounted on the side or top to prevent dripping from damaging the instruments.

• Microprocessor-based, FM Approved high over-temperature safety control.
• Set of two, one high and one low microprocessor-based, FM Approved temperature safety controls.
• Remote control over an Ethernet Link.
• 12 inch, chart printing, circular recorder.
• Strip chart recorder.

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Available Literature Includes:

Bemco F Series, Wide Range Chambers. Document is triple fold front and back, 2 pages, 336 KB download.

Bemco FNR Series, Narrow Range Chambers. Document is triple fold front and back, 2 pages, 336 KB download.

Bemco Temperature Chamber Design. Calculating required air flow, heating, and cooling systems, 12 pages, 579 KB download.

Bemco Temperature Conversion Table. Temperature conversion chart for -273.15 C (absolute 0) to +548.89 C (1020 F) in 10 degree increments, 1 page, 336 KB download.

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The systems described above are our Standard Models. We make custom equipment to your specifications.  If you have any questions, need assistance in preparing a specification, or have a technical problem you want help with, we are ready.  Our quotations and advice are free.