Burn-in and Stress Screening Chambers
Supervise the operation of your product, electronic device, circuit board,
or medical device while they are stress screened, burned-in, or
temperature cycled inside a Bemco Kardburn or Koldburn glass front
chamber. With a huge amount of testing or storage space within
instant reach, KD Chambers provide a compact and attractive alternative
to a walk-in chamber.
Glass door chambers were originally pioneered
by Bemco over 25 years ago. Available in cart loaded, shelf
loaded, relay rack mounted, and electronically fixtured versions, these
chambers are still the standard by which all other glass door chambers
are measured.
Often specified with optional power supplies or product exercising electronics,
these systems are designated a model KDB Koldburn when optimized
for stress screening, temperature cycling, or burn-in and a KDR
Kardburn when circuit board card cages or card cage support rails
are specified.
These chambers use specially fabricated temperature controlled
heated frame doors with conductively heated multi-pane glass
windows to allow individual bay access to items under test.
Construction
The exterior equipment and the control apparatus are neatly packaged
in a sheet metal enclosure painted Bemco Blue or optionally
from 300 Series stainless steel so that they can be flush
mounted through a wall or aligned with a narrow walkway. The
rear mounted vertical air duct is constructed so that a large
number of optional penetrations can be installed in the rear wall for
fixturing.
Similar in concept to the familiar reach-in cooler found
in supermarkets, these chambers are much easier to load than
a walk-in. The large glass doors help you watch your displays,
lights, and switches while keeping track of test progress
and observing potential problems before they become serious.
Kardburn and Koldburn chambers include a heliarc welded 304 Series stainless
steel inner liner with high temperature fiberglass insulation.
No asbestos is used. Duct-work and baffles are also fabricated
from 300 Series stainless steel.
Model |
Bays |
A |
B |
C |
D |
E |
F |
KDR1 |
1 |
61” |
31.8" |
28” |
101” |
69.8” |
42” |
KDR2 |
2 |
61” |
62.2" |
28” |
101” |
100.5" |
42" |
KDR3 |
3 |
61” |
92.7" |
28” |
101” |
130.7" |
42" |
KDR4 |
4 |
61” |
123.1" |
28” |
101” |
161.1" |
42" |
KDR5 |
5 |
61” |
153.6" |
28” |
101” |
191.6" |
42" |
KDR6 |
6 |
61” |
185.1" |
28” |
101” |
223.1" |
42" |
| Code |
|
Bays |
Number of Workspace Bays |
| A |
Interior Height |
B |
Interior Width |
C |
Interior Depth |
D |
Exterior Height |
E |
Exterior Width |
|
Exterior Depth |
KDR Table Notes:
- Standard temperature range is -20 C to +65 C for all Bays with
a common conditioning system, one local or remote refrigeration
system, one temperature control, and one heating system for
all bays. There are no separating bay walls. All bays are
connected in common. Allow 12" extra depth for fan motors
at rear. For individual bay chambers, you may
wish to look at our KDZ Series. For cart
loaded chambers, see our KDL chambers.
- Standard air flow pattern is top to bottom vertical with a rear
mounted air supply duct in each bay. Airflow includes
a large bottom mounted cooling coil to prevent dripping on
test objects and a top air distribution
baffle.
- Overall width given includes a 30” wide machinery
compartment.
- Glass doors are connected by a common frame, are in-fitting, and
include self closing springs and magnetic gaskets.
- Each bay door has a clear open loading area through the door of
27-1/2” wide by 64-1/4” high.
Conditioning
Each bay includes a high volume, non-sparking, aluminum blower drawing air
through a large, bottom of bay mounted cooling coil and an electric air
heating system. The blower discharges into a rear mounted duct that flows
air up the back wall to a ceiling mounted diffuser.
The high volume air circulation system assures temperature uniformity over
the items being tested and helps eliminate hot spots. An oversize shaft,
dual ball bearing race, TEFC motor mounted outside the workspace on the
chamber back wall drives the blower.
A proportionally controlled, water cooled refrigeration system utilizing
modern, environmentally friendly refrigerants cools the workspace.
This system is furnished as a packaged unit for remote mounting by
your refrigeration contractor. Air cooled refrigeration systems and integrally
mounted and enclosed refrigeration systems are also optionally available.
Fast response, low watt density open type heaters located behind a
radiation baffle raise chamber temperature as required. The heaters
are protected by a factory preset high temperature safety thermostat interlocked
with a separate power interrupting contactor.
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.
Controls
The KDR Chamber includes a microprocessor based, programmable 1/4-DIN, solid
state 256-step ramping controller with a 4-line LCD interface
display, and a large red LED display. An RS232 and RS485 interface
is standard. The protocol is Modbus™. LabVIEW™ drivers are
available.
A Factory Mutual approved high and low temperature safety control
with audible and visual alarm is optionally available.
Performance
Standard KDR chambers include a 1,500 cfm air circulation system in each
bay. They heat from 0 C to 65 C in approximately 60 minutes when loaded
with a test load equivalent to 115 pounds of aluminum per bay plus
3 shelves. They cool from 65 C to 0 C in approximately 30 minutes with
115 pounds of aluminum per bay plus 3 shelves, while the load dissipates
500 watts per bay while cooling.
A standard higher performance conditioning system (add -HC to the model number
requested) has the same performance on cooling and heating as the base
system with a load of 230 pounds of aluminum per bay plus 3 shelves,
while the load dissipates 1000 watts per bay while cooling.
Custom conditioning systems with much faster heating and cooling rates and
higher live load capabilities are available.
Temperature Control is + or - 1 C guaranteed, + or - 0.25 C typical.
Optional Accessories
- Access Ports. Sizes are 2”, 3”, 4” and 6.” One
3” access port in the left wall is provided with each chamber.
- Shelf pilasters.
- Relay rack front and back rails.
- Card cages matching your circuit boards.
- Wire-type stainless steel shelves.
- Wire type epoxy coated shelving systems.
- LN2 boost cooling with a 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.
- Burn-in power supplies with distribution buss bars,
sequencing, or monitoring electronics.
- Distribution circuit boards with product pendants.
- Test termination cable boxes and connectors.
- High life and high current connector arrays.
- Insulated wall feed-throughs and extender boards.
- Electronic product load and product exercising boards.
- Stainless steel exterior construction.
Optional Instruments
Available instrument options include:
- Microprocessor-based, FM Approved high and low temperature safety controls.
- 12 inch chart printing, circular recorder.
- Single pen or multi-pen strip chart recorders.
- Programmable logic control of test processes. Bemco recommends
Allen Bradley (ABB) PLC’s and software.
- Touch screen HMI’s (human machine interfaces).
Available Literature Includes:
Bemco KD Series, Kardburn and Koldburn
Glass Door Burn-in, Stress
Screening, and Medical Storage Chambers. Six standard common bay
KDR Glass Door Chambers, four standard KDZ individual bay Glass Door
Chambers, one and two bay cart loaded chambers, and one to six bay
KDM Medical Storage Chambers. Document is 8 pages, 668 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.
