Roll-in, Cart Loaded, Stress Screening Chambers
Pre-loaded and electronically fixtured carts are easily rolled into a Bemco
KDL, Burn-in or Rapid Temperature Cycling Chamber. All models
in this series are modular. They are designed to be placed together
to form up to a six bay testing facility with a control console
between every two bays.
The Bemco KDL series is designed for production testing of electronic circuit
boards and completed electronic systems. They accept Bemco KDLC Carts
that have a working area of 42” wide by 60” high by 48” deep
suspended on insulated runners and casters 11 inches above the test area
floor.
KDLC Carts are available as shelf carriers with four stacks of 20” x
20” wire type shelves, adjustable on 3/4” increments, as load
carriers, or as card cage carriers that support four stacks of
standard 19” relay
rack style card cages. Load carriers are normally specified to allow
convenient testing of large solid objects normally tested in walk-in
chambers.
Custom carts, connectors, load boards, card
cages, connector arrays, bus bars, and fixturing systems
optimized to match your specific requirements are available.
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.
In the same manner as the KDR Koldburn chambers, the KDL Cart loaded chamber
uses a specially fabricated temperature controlled heated frame
door with a conductively heated multi-pane glass window to provide
a clear view of the entire workspace.
Each bay floor has two slots to allow flush loading
of KDLC Carts without having to use a ramp. Each bay also includes
provisions for installation of manual or automatic cart electrical,
pneumatic, or hydraulic fixturing connectors at the rear of the
workspace.
KDL chambers include an angle reinforced carbon steel outer case and 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.
Service access in from the rear.
Model |
Bays |
A |
B |
C |
D |
E |
F |
KDL1 |
1 |
68” |
48" x1 |
50” |
88.1” |
86” |
94.5” |
KDL2 |
2 |
68” |
48" x2 |
50” |
88.1” |
142" |
94.5" |
| Code |
|
Bays |
Number of Workspace Bays |
| A |
Interior Height |
B |
Interior Width |
C |
Interior Depth |
D |
Exterior Height |
E |
Exterior Width |
|
Exterior Depth |
KDL Table Notes:
- Standard temperature range is -20 C to +94 C for each bay.
- Each bay has an independent conditioning system with a local or
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.
These groups are separated into two chamber sections
with a conditioning and product fixturing package in the
middle. If larger groups are desired, we recommend
a 6-inch wide spool piece between groups of two chambers
to prevent chamber cross-talk.
- Overall width given includes a 30” wide machinery
compartment.
- Glass doors are of the overlapping type and each includes a dual
latch and connecting bar release.
- Each bay door has a clear open loading area through the door of
48” wide by 68 ” high.
Conditioning
Every bay includes two, high volume, non-sparking aluminum blowers drawing
air through a large tongue like baffle beneath the KDLC Cart. Air from
the baffle is passed through a rear mounted refrigerated heat exchanger,
heaters, the two blowers, and then discharged into a top supply baffle
to evenly distribute through the KDLC Cart. High volume air flow assures
temperature uniformity over the items being tested and helps eliminate
hot spots.
Two oversize shaft, dual ball bearing race, TEFC motors mounted
outside the workspace on the chamber top drive the blowers. Please
note that chamber height is increased by approximately 12” in the top
area where the two fan motors are located.
A proportionally controlled,
water cooled refrigeration system utilizing modern, environmentally
friendly refrigerants is supplied to cool each bay.
These systems are furnished as packaged units for remote mounting
by your refrigeration contractor. Air cooled refrigeration systems
and integrally mounted and enclosed 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 KDL 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 KDL chambers include a 3,000 cfm air circulation system in each
bay. They heat from 0 C to 85 C at an average rate of 5 C per minute
when loaded with a KDLC Cart and a test load equivalent to 500 pounds of
aluminum per bay including fixturing. They cool from 85 C to 0 C in at
an average rate of 5 C per minute with 500 pounds of aluminum per bay while
the load dissipates 2000 watts per bay.
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
These systems are designed for custom-tailoring to specific testing needs.
Some of the common accessories specified include:
- KDLC Carts optimized to a particular product.
- Connector assemblies for automatic cart to chamber electrical, pneumatic,
or hydraulic attachment.
- 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 mounted
on a KLDC Cart.
- Test termination cable boxes and connectors mounted on a
KLDC Cart.
- High life and high current product connector arrays.
- Electronic product load and product exercising boards mounted on
a KLDC Cart.
- 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.
