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Air Circulation
The homogeneous condition of temperature
inside the chamber maintaining by
a forced blower with continuous duty
rated TEFC motor for circulation.
The conditioning space in the main
chamber is baffled and heater and
cooling coil is located in the conditioning
space. The refrigeration unit is fitted
under the chamber so as to ensure
minimum space utilization.
Heating
System
Low surface loading sealed tubular
heaters conforming to IS-4159 provided
to add heat in the chamber. The heaters
are located in the conditioning space
and there will not be any direct radiation
of heat on the item under test.
Humidity
System
Low-pressure moisture generator will
be provided to generate moisture and
add humidity in the chamber. The generator
will be of minimum water level controller
and mechanical float type refilling
arrangement. Soft water will be used
for the moisture generator.
Refrigeration
System
Two-stage air cooled cascade refrigeration
system will be provided working on
freon 22 and 13 as refrigerants with
evaporative cooling attachment for
working in high summer ambient condition.
The system is fitted with HP/LP cut
off switch, overload protector, backup
fuse protection etc. Low RH condition
is maintained by smooth tube evaporation
coil dehumidification arrangement.
Instrumentations
Dual loop microprocessor programmer
with direct RH display is provided
to carry out steady state as well
as cyclic damp heat test. Solid state
triac firing energy regulator with
o to 100% proportional control for
heaters is fitted with.
Control
Panel
Control Panel will be provided at
the lower side of the Chamber, which
will house Microprocessor Based Programmer
with direct RH display with Printing
Facility, On/Off Switches, Fuses,
Contactors, Indicating Lamps etc.
Wiring
All the channel type wiring will be
as per IS code.
Utilities
1. One Stainless Steel bar shelf with
adjustable height arrangement will
be provided.
2. Window : 30 cm x 30 cm, 2 pane
with low wattage heater and manually
operated wiper.
3. Chamber Drain.
4. Chamber Interior Inspection Lamp.
Safety protection
1. Back up fuse protection for mains
and individuals circuit.
2. Over temperature safety cut off
thermostat with audiovisual alarm.
3. Overload protector for motor.
4. HP/LP cut off switch for compressor.
5. MCB for heaters.
6. Minimum water level controller
with mechanical float type refilling
arrangement will be provided.
Power
Supply
230/415 Volts ±5 %, Single/Three
Phase neutral, 50 c/s , AC power supply.
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