Environmental Chambers and Space Simulation Systems

A Unique Solution!

A conductively heated multipane glass door allows you to see your products and systems while they are being tested.

With a standard desiccant drier and direct humidity sensor you can reliably test at both high and low humidities.

FW30 Series Glass Door Humidity Chambers, without accessories, start at:


Standard Bemco FW30 Series chambers are available on the "B-QUICK" ship plan.

Request a free quotation or analysis of your testing needs. Our experienced engineers are ready to help you.

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FW30 Literature PDF

FW30 Literature PDF

Glass Door Humidity Chambers

The Bemco FW30, mechanically cooled, Glass Door Humidity Chamber has a temperature range of -18 C to +94 C (0 F to 200 F) and a humidity range of up to 5% RH to 95% RH (see the Chart below). This chamber features dry air injection and a direct humidity sensor. It operates without dewpoint limit from 5% RH to 95% RH over the range of 30 C to 85 C and even allows operation at 20% RH at 5 C and 50% RH at -14 C!

FW30 Front View with Optional RecorderFW30 Conditioning Compartment

Based on the pioneering Bemco KDR Series of Glass Front Burn-in the Temperature Cycling Chambers these systems can be loaded with large solid objects normally tested in walk-in chambers. A view of the entire workspace lets you see your test objects operate and keep track of products.

The FW30 accepts shelves and can easily be adapted for use with card cages, product carriers, and production fixturing.


Interior Height
Interior Width
Interior Depth
Exterior Height
Exterior Width
Exterior Depth
Shipping Weight, lb

Clear door access height is 63 inches and clear access width is 27 inches due to the door frame.


RH vs Temperature ChartChamber air is recirculated by a high volume, stainless steel axial fan discharging through a hinged right side mounted guard and diffuser baffle to create a uniform environment around your test objects.

The fan is driven by a horizontally mounted motor with dual ball bearing races, connected by a large diameter extended stainless steel shaft.

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. Fast-response open type heaters, located behind a radiation baffle, raise chamber temperature as required.

Chamber humidity is increased by a Bemco mass transfer vapor generator with a sight glass, a low water cutoff, and automatic drain freeze protection. The vapor generator can be shutoff and drained when very low humidity control is desired.

Chamber humidity is decreased by the direct injection of -73 C (-100 F) dew point dry air produced by a dual bed regenerative compressed air drier furnished with an isolation valve, an inlet particulate and coalescing filter and an outlet filter regulator.

Water and air connections are located on the top.

Safety Systems and Electrical Wiring

FW30 Chamber 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 FW30 left side view is shown at the left. Notice the access port for convenient access to the chamber workspace. Additional access ports or fixturing can easily be located in this wall or on the chamber rear wall making this system ideal for electronic testing where large numbers of penetrations for wiring are required.


The FW30 has a sloped roof and a sloped floor to minimize dripping on test objects and to meet Mil-Std 810 and Mil-Std 202.

It includes a continuously heliarc welded 304 Series stainless steel liner with high temperature fiberglass insulation. No asbestos is used in chamber construction. The outer case is fabricated from cold rolled steel finished in Bemco Blue.

A matching machinery housing is mounted on the right hand side. The FW30 has a very large workspace for its extremely compact size.


The FW30 is furnished with a two channel, 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.

Humidity is sensed by a direct reading electronic humidity sensor accurate to + or - 2% RH over the dew point temperature range of minus 20 C to 85 C (-4 F to 185 F). This sensor is mounted through a sleeve located on the roof near the left side of the door.


Cooling rate from 75 C to -15 C in less than 90 minutes. Heating rate -15 C to 75 C in less than 60 minutes. Both with the chamber empty.

+ or - 1 C (+ or - 1.8 F) guaranteed control, + or - 0.15 C (+ or - 0.25 F) typical.

Humidity 5% RH to 95% RH, see chart. 95% RH at 85 C (185 F) maximum.

Optional Equipment

Optional Instruments

Available instrument options include:

Available Literature Includes:

FW30 Literature PDF Bemco FW30 Series, Glass Door Temperature/Humidity Chambers. Document is triple fold front and back, 2 pages, 353 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.

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