238
E
ENVIRONMENTAL CHAMBERS
Gas Cooled
GCC-Series, Gas Cooled Chambers
Direct injection liquefied gas cooling using liquid CO2
to achieve -60°C (or optionally using liquid nitrogen to
achieve -150°C) & rapid heating to 200°C as standard (or
optionally 300°C) all under the control of a sophisticated 8
segment pair controller. Enables the most rigorous temper-
ature test profiles to be used for accelerated age testing or
environmental simulation.
Thermal Range:
The working temperature range of the
chamber is -75°C to +400°C.
Thermal Performance:
The equipment has sufficient power
to enable a heating rate of up to 10°C/minute with a small
thermal load. Temperature stability under steady state
conditions is better than
±
0.5°C.
Temperature uniformity throughout the empty chamber
measured not less than 75mm from any surface is better
than
±
0.5°C.
Internal Chamber Construction:
The internal chamber is
fabricated from 304 grade polished stainless steel. All the
joints are externally sealed to prevent moisture entering
the insulation when the chamber is used at temperatures
below ambient.
External Construction:
The main case of the chamber is
fabricated from mild steel rectangular hollow section
panelled with zinc coated mild steel sheet. All external
surfaces are finished with grey powder paint.
Thermal Insulation:
The inner chamber is insulated with high
quality ceramic fibre and mineral wool blanket of
adequate thickness to ensure a safe outer case temp.
Chamber Door:
The chamber is fitted with a single door
that is hinged on the left hand side and opens to give full
access to the chamber. The door is fabricated from zinc
coated mild steel sheet for the exterior and 304 grade
stainless steel for the interior. The door is fitted with silicone
rubber door seals to reduce heat leakage through the
joints.
GCC30
Options:
●
Over-temperature protection to DIN 12-880 class 2
(recommended to protect valuable contents & for
unattended operation)
●
300°C optional maximum temperature
●
Optional liquid nitrogen injection system to reach
-150°C (including 2m insulated stainless steel pipe &
pressure relief valves)
●
Access ports for cables & pipes
●
Programmable controls with additional segments &
multi-program capability
●
Interior light (subject to temperature limitations) or
through window illumination kit
●
Additional shelves as required
●
A wide range of sample loading & handling
accessories can also be supplied
●
Paperless DAQ (Data Acquisition) graphical
recorders available.
Model
Temp.
range
(
°
C)
Heat-up
time
to
Max.
(mins)
Temp.
stability
°
C
PID
Temp.
uniformity
300
°
C
(
±
°
C)
Cool-
down
time to
-60
°
C
(mins)
Dimensions
Shelves
Fitted/
accepted
Shelf
loading
Each/
total
(kg)
Max.
Power
200
°
C
Power
Supply
Internal
HxWxD(mm)
External
HxWxD(mm)
GCC30
-60 to 200 26
±
0.5
±
5.0
12 310x300x300 570x765x770 2/3
10
20 750
single
phase
GCC60
-60 to 200 26
±
0.5
±
5.0
12 410x400x380 670x865x870 2/5
10
30 1000
GCC120
-60 to 200 26
±
0.5
±
5.0
12 660x500x380 920x965x870 2/9
10
40 1500
Uniformity values are measured with vents closed in a steady state chamber after a stabilization period. Shelf loadings are based
on evenly distributed weight. Gas cylinders & Dewars are not included as part of the standard offer.
Access Ports:
A nominal 50mm diameter cable port is located centrally on the left hand side of the inner chamber
wall.
Air Circulation:
Forced air circulation is provided by a rear mounted fan. The fan is mounted behind an air guide to
prevent it being touched by the operator.
Shelves and Runners:
The chamber is supplied with three pairs of fixed shelf runners. Two perforated stainless steel
shelves are supplied.
Temperature Control:
The temperature of the chamber is controlled by a Eurotherm 3216 digital indicating
microprocessor based three term time/temperature program controller. The controller is fully adjustable and may be
"tuned" by the customer to suit the temperature and load in the chamber.
Under/Over Temperature Control:
A Eurotherm 2132 controller is fitted as a low and high temperature cut out. If a fault
causes the main set point temperature to be exceeded then a safety contactor will isolate the heating elements and
solenoid valves. The over temperature circuit must be manually reset when the chamber has warmed up or cooled
down and the fault has been cleared.
Heating System:
The chamber is heated by mineral insulated metal sheathed elements. The low surface watt loading
of the elements ensures a long and reliable service life.
Cooling System:
The chamber is cooled by liquid Nitrogen. A cool channel circuit in the controller switches a solenoid
valve to control the direct injection of liquid into the chamber. A second solenoid valve in the supply line is controlled
by the under temperature controller and will switch off the liquid Nitrogen if the direct injection valve fails in an open
condition. Appropriate pressure relief valves are included to ensure a safe working system. A two metre length of
insulated flexible stainless steel hose is supplied for connection of the equipment to the customers bulk supply.
Build Standards:
The oven is designed and built to good engineering practice in a facility having a certificated
quality assurance scheme to ISO 9001:2008. It complies fully with the relevant UK and European Union Health and
Safety at Work legislation. It is compliant with the EU Low Voltage and EMC directives and carries the CE mark.
