Temperature control range
Temperature accuracy (in time)
±1°C at steady state
Temperature variation rate (average values with 100kg steel test load)
2°C/min heating up from -40°C to +20°C
1.7°C/min cooling down from +20°C to -40°C
from 10% to 98% R.H.
Humidity accuracy (in time)
±3%....±5% at steady state (and anyway not less than ±1°C on the dew point difference)
Dewpoint temperature range
1. The reference sensor is installed on blow-out of air conditioning unit.
2. The temperature rate is according to IEC60068-3-5 specification
Internal useful capacity
Internal useful dimensions
2000 x 3000 x 2500mm (W x D x H)
Chamber external dimensions
2300 x 4150 x 2800mm (W x D x H)
Machine unit dimensions
2000 x 1200 x 2100mm (W x D x H)
Vapor tight prefabricated panels, AISI 304 corrosion resistant stainless steel interior, internal welded stainless steel, light blue plastic coated zinc or steel exterior. Thickness: 150 mm. The possible unevenness of the surface planarity due to the welding doesn't decrease the reliability level, in fact the welding of the walk-in chambers internal coating is absolutely the best warranty for its sealing.
High density polyurethane foam injection (42 Kg/m³.) and rock-wool
Chamber floor construction
Reinforced stainless steel 15/10
Floor loading capacity
A draining system is provided in order to evacuate the condensation water that can be formed particularly during the transition phase (due in particular to the thermal inertia of the chamber metallic parts). This allows avoiding damages to the prefabricated panels due to possible water infiltration and relative frost formation during the cold phases.
Tight and double wing type door, double seal hinges and locks. The door can be opened also by the interior, for safety reasons. Door frame heating system will be provided.
1500 x 1900mm (WxH), which allow a half size car to go in
No 1 window will be provided, mm 450 x 450H, complete with an electric heating element on the surface of the glass able to prevent the formation of condensate. The windows will be placed on the door.
Light by 2 x 60 W lamp. The lamps can be switched from outside.
Air treatment system
Realized into an air treatment duct positioned on the end wall of the chamber. It has inside the following elements:
The thermo-regulated air flows into the air treatment duct, passing through the above mentioned elements before to enter into the test chamber.
Performed by mechanical cooling based on cascade stage system. The cooling system is realized with two semi-hermetic alternative type compressors by an advanced and high quality design. Main body in special cast iron, easy dismountable cylinders and light metal alloy pistons. Water (+29±3°C) condenser. The cooling system is complete with an Automatic Protection of the Compressor by Injection System that protects the compressors during the cooling down from high temperatures. Such system allows a self-regulating cooling of the compressors, in order to avoid temperature exceeding +30°C (no damages to motor winding).
Protection of compressors
The compressors are protected against:
Environmental friendly type (Non-CFC), R404A and R23 are used that have not been prohibited by the Montreal convention or considered harmful under the London amendment.
By electrical heaters, protected by double adjustable fail-safe thermostats that disconnect a magneto-thermal switch with current-launch coil.
Low pressure steam generator heated with armored electrical heaters, complete with pressure switch and safety valve.
By means of smooth tube coil connected to the cooling unit.
Electronic humidity sensor is used for the measures in the test chamber. This allows the set and measurement of relative humidity expressed directly in % R.H. The regulation of the humidity is performed by the microprocessor programmer. This allows extremely precise control of the programmed values.
Forced air re-circulation realized with high power centrifugal fans in order to achieve good temperature uniformity. Fans inside the chamber are extremely sturdy, low noise and able to provide continuous and intensive air circulation and equal air distribution even under high temperature and humidity operational conditions.
Complete with door locking, remote control switches, fuses, magneto-thermal switches, motor thermal protections etc... Positioned inside the building.
Machine group positioning
In a frame placed behind of the chamber, inside the building.
Noise of machine unit
78 dB (A) measured at 1 m from the front of the chamber in a non reverberating ambient.
50 kW max, 35 kW average.
380/50/3 + N + G (auxiliary controls with 24 VAC for operator's safety)
PLC control system
The control system based on PLC is easy to use by means of keyboard and LCD. The PLC is the perfect solution to the extremely speed processes or to automation tasks which require data elaboration.
The system guarantees:
The system can be configured with:
PC programming and controlling system
New Software WINKRATOS package for P.C. (P.C. not included) is the new generation control and management system running in Windows 2000/NT environment. Powerful and flexible, it offers many innovative features.
PC main features:
This system allows carrying on irradiance tests by means of IR lamps.
IR spot frame
Made of stainless steel and complete with anti-dropping system
IR spot dimensions
1100 x 1800mm (W x D)
28 Siccatherm lamps by OSRAM having 375 W/each, AC 200/220V, or equivalents
32 Siccatherm lamps by OSRAM having 250 W/each, AC 200/220V, or equivalents
IR lamps features
Radiation in the infrared range, up to 3000 nm (high infrared). The radiation is produced by a special incandescent spiral hardened at high temperature and placed in a hard-glass mushroom shaped provided with reflector. The chamber useful height will be reduced by approx mm 250.
OFF, ON splitting into 4 blocks (4 zones) by auxiliary contacts.
10 rows 6 tiers at 180mm pitches