Wide Range Individual Bay Chambers
The Bemco KDZ is similar to the Bemco Kardburn KDR except it has a wider
temperature range, a built-in product support system, a latched
glass door with a compression gasket, and every bay has it own independent
conditioning system, refrigeration package, heaters, and controls.
Each bay can be individually loaded without affecting its neighbor.
When more than one bay is specified, a 6 inch wide ring separator
is furnished with internal vent fans. This separator ring isolates
each bay preventing thermal cross-talk.
Each bay is furnished with a built-in, universal 1-1/2 inch T Slot, anodized
aluminum, forward and back strut frame to allow easy installation
of complex product support structures, shelves, or relay rack
rails. When rack rails are installed, the struts are aligned so
that standard 19 inch panels fit conveniently. Clearance between
the side rails is 20-7/8”.
Shelves, when specified, are 20 inches wide by 36 inches deep.
Support rails are set back 5-3/4” from the chamber face and the
front and back rails are 24-1/2” apart.
Often specified with optional power supplies or product exercising electronics. KDZ
chambers are more compact than KDR chambers. They are designed
to be moved singly by bay while passing through narrow doors
or aisles and then assembled on site as a group.
Construction
The refrigeration, electrical, and control apparatus are neatly
packaged in a sheet metal enclosure accessed from the rear of
each bay. The chamber exterior structure is fabricated from angle
reinforced carbon steel painted Bemco Blue. The outside skin can
also be optionally finished in 300 Series
stainless steel so that the KDZ can be mounted through the wall
of a clean room.
Each bay has its own access door fitted with a conductively heated multi-pane
glass window to allow a clear view of the interior.
A channel base is furnished to rigidly support the chamber and allow convenient
repositioning when desired.
KDZ chambers include a heliarc welded 304 Series stainless
steel inner liner with high temperature fiberglass insulation.
No asbestos is used. Duct-work is also fabricated
from 300 Series stainless steel. Interior upper and lower air
baffles are made from black anodized aluminum.
Model |
Bays |
A |
B |
C |
D |
E |
F |
KDZ1 |
1 |
41.2” |
24" x1 |
38” |
82.2” |
36” |
63.7” |
KDZ2 |
2 |
41.2” |
24" x2 |
38” |
82.2” |
78" |
63.7” |
KDZ3 |
3 |
41.2” |
24" x3 |
38” |
82.2” |
120" |
63.7” |
KDZ4 |
4 |
41.2” |
24" x4 |
38” |
82.2” |
162" |
63.7” |
| Code |
|
Bays |
Number of Workspace Bays |
| A |
Interior Height |
B |
Interior Width |
C |
Interior Depth |
D |
Exterior Height |
E |
Exterior Width |
|
Exterior Depth |
KDZ Table Notes:
- Standard temperature range is -20 C to +94 C for each Bay.
- Each bay has an independent conditioning system with a
remote refrigeration system, a temperature control, and a
heating system.
- All bays are separate and may be operated independently on their
own program.
- Groups of chambers, of any number, can be arranged side by side.
Generally, these groups are separated by a 6-inch wide
spool piece between sets of chambers to prevent chamber
cross-talk. The dimensions given for 2, 3, and 4 bay chambers
includes a 6" spool between every inside wall.
- Ducted top to bottom airflow includes a large bottom mounted cooling
coil, rear vertical duct, and a top air distribution baffle.
- A separate, relay rack style control console is standard. Multiple
bay systems are controlled from the same common console.
- Each bay door has a clear open loading area through the door of
24” wide by 41.2 ” high. The 24" width is reduced by the
internal strut support system.
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, remote 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 KDZ Chamber includes a microprocessor based, programmable 1/4-DIN, solid
state 256-step ramping controller, 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 19” relay rack console, 24” wide by 30” deep, is standard
with every system. Up to eight bays can be controlled from a single console.
A Factory Mutual approved high and low temperature safety control
with audible and visual alarm is optionally available.
Performance
Standard KDZ 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
2” access port in the rear wall is provided with each chamber.
- 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 rear 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.
