This document summarizes an environmental test chamber. It provides efficient air circulation and heating/humidification systems to ensure uniform temperature and humidity. The chamber is used to test electrical/electronic components, mechanical assemblies, packages, and materials under simulated tropical conditions. It has a triple-walled stainless steel construction with efficient refrigeration and temperature/humidity control systems. Safety features include compressor delay timers and temperature controllers.

1. Environmental Test Chamber
Benefits:-
 Air Circulation
Efficient forced air circulating system is provided to ensure uniform temperature.
 Heating & Humidification
Air heaters are provided for heating above ambient temperatures.
A water boiler with reservoir & float valve produces steam for humidifying the chamber.
Applications:-
 These equipments are used for climatic and durability tests of electrical and
electronic components, corrosion test on mechanical assemblies, tests on
packages, paints and varnishes, cement plants, apparatus and materials for
simulated tropical and extreme tropical conditions and for botanical and
zoological investigations, testing of chemicals, drugs, pharmaceutical, cosmetics,
medicine, capsules, etc.

2. Construction:-
 The chamber is triple walled at back and bottom inter both the walls are stainless
steel 304 quality duly polished with mirror finish buffing & outer wall is stainless
Refrigeration System:-
 Cooling: By hermetically sealed “Emersion”/Kirloskar Make Compressor. 2 stage
compressor cooling system with cascade system for Ultra Low Temperature
range & single stage system for humidity control.
 Cooling Coil: Copper cooling coil is sandwiched between the “PUFF” insulation
& the outer side of the inner working chamber to transfer the cooling by
conduction process for Ultra Low Temperature range. A separate finned cooling
coil is fitted behind the baffle wall below the blower fan for humidity control
system.
 Condensing Unit: Heavy duty air cooled condensing unit with condensing fan
will be provided at bottom side of the chamber. The complete assembly is cited
on base in such a way that any component can be replaced very easily.
 Refrigerant: CFC free-404 A for the first & third stage & CFC free SUVA-95 for
the second stage.
Temperature & R.H. Control:-
Controls: Microprocessor based PID/PLC controls with HMI for the entire system to be
controlled with single HMI.
Data Acquisition System: Microprocessor based electronic data acquisition system for
recording High/Low temperature & Humidity with respect to time and date for audit trial
purpose also provided with the unit is RS-232 port for PC connectivity.
Sensors: Direct RH% Rotronic Make Hygroclip sensors imported from Switzerland for
Relative Humidity which can withstand a temperature of 200°C. 2 nos. PT-100 sensors
for temperature -70°C to +200°C is provided inside the chamber.

3. Safety Features:-
2 minute compressor “on” delay timer to safeguard the compressor. Compressor
overload relay protector. Electronic low water level cut-off device to cut-off the supply to
boiler heater in case of low water level. Safety temperature controller for MCB for mains.
Special Care:-
Please note that this equipment has to be operated at an ambient temperature of 25°C
+/- 2°C & suitable rating Servo Control Voltage Stabilizer to be installed in case of
voltage fluctuations.
Specifications:-
Model No:
ETC-01
Internal Dimension
(cms)
Rating
(K.W.)
Capacity
(Ltrs.)
ETC-
A
45 x 45 x 45 1.5 91
ETC-
B
45 x 45 x 71 1.5 145
ETC-
C
60 x 60 x 60 2.0 215
ETC-
D
70 x 70 x 55 2.5 270
ETC- 60 x 60 x 90 3.0 325

4. Model No:
ETC-01
Internal Dimension
(cms)
Rating
(K.W.)
Capacity
(Ltrs.)
E
ETC-
F
70 x 70 x 95 3.5 465
ETC-
G
80 x 80 x 105 4.0 675