Conditioning
Conditioned chamber air is recirculated by a high volume, non sparking aluminum axial fan discharging through a removable rear mounted guard and diffuser baffle to create a uniform environment around your test objects.
The fan is driven by a close coupled externally mounted motor with dual ball bearing races, connected by a stainless steel shaft. Fast-response open type heaters, located behind a radiation baffle, raise chamber temperature as required.
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.
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.
Safety Systems and Electrical Wiring
All systems have thermal and current sensors on the compressor, charging valves, 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.
Power requirement is 115 VAC - 1 Phase – 60 Hertz, 25 FLA. Refrigeration is air cooled. 50 Hertz is available as an option.
Construction
FB1.5V Series chambers include a 304 Series stainless steel welded inner 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 dual gaskets to greatly reduce thermal losses near the door face. An over-center, black anodized aluminum cam type latch seals the door which closes flush on the front face of the chamber for a smooth appearance.
Controls
Each Bemco FB1.5V chamber is furnished with a microprocessor based programmable 1/4-DIN, solid state, 10 step ramping controller that utilizes an adaptive control algorithm to precisely control chamber temperature.
The control features dual 4 digit displays. An advanced control algorithm improves sensor accuracy by more than 50%. Temperature inside the FB1.5V chamber is sensed by a precision thermocouple. An EIA-485 Modbus interface is standard.
Thermal Performance
Cooling rate from 23 C (+73 F) to -73 C (-100 F) is approximately 45 minutes and heating rate from 23 C (+73 F) to +177 C (350 F) is approximately 35 minutes, both with the chamber empty.
+ or - 1 C (+ or - 1.8 F) guaranteed control, + or - 0.15 C (+ or - 0.25 F) typical.
Optional Equipment
- Window and interior light. Window size is 8.5 ” x 8.5 ” 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, are standard.
- 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.
- Four refrigeration gauges (two per compressor) mounted in the refrigeration package available with or without isolation valves.
Optional Instruments
Controls are mounted on a recessed aluminum panel to prevent dripping from damaging the instruments. Available instrument accessories:
- 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.
Available Literature Includes:
Bemco FB1.5V Series, Compact Wide Range Chambers. Document is triple
fold front and back, 2 pages, 330 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.
Document is 1 page, 336 KB download.
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.
