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Environmental Specialties
Introduction
Environmental Specialties (ES)
has been an important supplier
for over twenty years in the
design and manufacture of
walk-in Stability Chambers that
meet or exceed the current ICH
stability standards. The largest
multiple chamber installations
in the United States have been
designed and built by ES.

These installations have
incorporated smaller walk-in
equipment for accelerated and
extended range testing with the
larger chambers designated for
long term stability testing.

Chambers have often exceeded
3,500 sq.ft. for long term
studies. Stability chambers are
designed for efficient air flow
that guarantees temperature
and humidity uniformity under
extreme loading conditions and
our guarantee is never limited
by size.
Applications Long term stability studies Accelerated stability studies Freeze / thaw and thermal
cycling Long term stability studies Accelerated stability studies Freeze / thaw and thermal
cycling
WRST - Standard Features Modular metal skinned panels with
urethane insulated tongue and groove
construction for chamber enclosure. "Cam-locking" construction with vinyl
gasketed seams. Low height aluminum ceiling plenum
housing. Totally accessible hinged drain pan for
maintenance and cleaning of all interior
plenum components. PSC fan motors for energy efficiency.
All fan motors rated for operating
temperatures of chamber. Motors are
remoted from chamber interior where
application exceeds rating. Automatic defrosting with refrigerant hot
gas and/or electric heat for quick and
efficient operation. Semi hermetic continually operating com-
pressors for extended equipment life and
maximum chamber temperature control and
uniformity. Uniform horizontal and vertical air distribu-
tion through a lay-in ceiling air distribution
system with anodized aluminum support. Fully accessible control panel to efficiently
and securely house all controls, alarms, and
recording devices. Microprocessor based control of chamber
parameters. Vapor proof fluorescent light fixtures. Factory leak testing of all refrigeration
assemblies prior to shipment. Bench testing of complete control panel
and electrical devices performed prior to
shipment. Applicable ISO listing 9001:2000 applies.
Luwa Environmental Specialties LLC 4412 Tryon Rd. Raleigh, NC 27606 Phone 800.688.5859/919.829.9300 Fax 919.833.9476

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WRST Options Structure / Electrical
Stainless wall, ceiling and floor finishes. Electrical wiring to NEC standards for CLASS I DIV 1 or
2 environments. Maximum product security through dead-bolts or locking
bars. All security locking mechanisms are furnished with
internal emergency relief. Freestanding open wire shelving. Movable top track or floor rail shelving. Thermopane view window in door or wall panels. Access ports and pass throughs. Surface mounted vapor proof duplex outlets for convenience. Vinyl floor mat runners in open areas or seamless floor covering
over complete area. Exterior/interior door ramps. Emergency lighting systems. PLC upgrade available replacing all micro-processor based
controls and alarms. RS 232 / 485 or 4-20 mA comms available.
WRST Options - Mechanical Perforated lexan ceiling designed to deliver low velocity air
uniformly through-out the entire chamber. This approaches
laminar flow. Lay-in tiles are prismatic for light diffusion. Complete stainless steel finish for ceiling plenum housing
including drain pan. Exhaust fans with stainless steel filtered air intake or
dampered connection ports for host building supply and
return air to reduce stagnation in 40°C/75% RH rooms. Base level dehumidification with a dual coil split system. Extended range dehumidification by ES developed and field
proven proportional air volume regenerative desiccant drier.
This design allows close tolerance control and extended life
of drier components. Low range humidity supplementation with mechanical
atomizer or ultrasonic generator.
Extended range humidification by independent passivated
stainless steel steam generator designed for pure water
supply. Point of use water purification system for steam generator
supply water. Copper or phenolic coated evaporator fin construction for
protection in corrosive environments. Complete 100% redundant backup refrigeration systems with
automatic switch over. Vertical wall plenum configuration for increased chamber
loads requiring greater evaporator coil surface area and air
volume typical of large 25°C/60% RH areas. Available designs for temperature uniformity throughout
entire chamber to ± 0.3°C. Available designs for humidity uniformity throughout entire
chamber to ± 1% RH. Conditioning packages designed to use host building chilled
water systems for chamber cooling. Complete chiller
packages with redundancy can be provided in lieu of building
chilled water. Non-refrigerated cooling using building ventilation available
for certain applications. Remote air handlers to remove mechanical components
from chamber interior and increase air volume.

WALK-IN CHAMBERS

REACH-IN CHAMBERS

ULTRA-LOW FREEZERS

SERVICE AND VALIDATION
ESWRSTr.1