| CONSTRUCTION: |
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.
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| THERMAL INSULATION: |
high density polyurethane foam injection (42 Kg/m3.) and rock-wool.
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| CHAMBER FLOOR CONSTRUCTION: |
reinforced stainless steel 15/10
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| FLOOR LOADING CAPACITY: |
30,000 N/m2 |
| DRAINING: |
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.
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| DOOR: |
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.
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| DOOR DIMENSIONS: |
mm 1500 x 1900 H, which allow a half size car to go in |
| OBSERVATION WINDOWS: |
n. 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.
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| INTERNAL LIGHT: |
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:
- cooling evaporator
- heating system
- Thermo-regulated air re-circulation fans
- Dehumidification coil
- Humidification steam inlet duct
- Electronic humidity sensor and PT100 thermal probe
The thermo-regulated air flows into the air treatment duct, passing through the above mentioned elements before to enter into the test chamber.
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| COOLING: |
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).
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| COMPRESSORS: |
The compressors have the following advantages:
- Higher efficiency up to 10%
- Greater reliability by improved lubrication and lower cylinders temperatures
- Streamlined body improve gas management, reduce pressure drop, increase efficiency
- Multi-port suction to provide uniform cylinders cooling for reduction of wear
- Head mount discharge valve to provide durability minimizing discharge tube pulsation
- new crankcase ventilation system to significantly reduce oil circulation rate
- Sentronic™ compatible to provide a reliable lubrication protection system
- Multiple sight glass locations to improve service ability and design flexibility
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| PROTECTION OF COMPRESSORS: |
the compressors are protected against:
- overheating
- over/under pressure
- overloading
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| REFRIGERANT: |
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.
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| HEATING: |
by electrical heaters, protected by double adjustable fail-safe thermostats that disconnect a magneto-thermal switch with current-launch coil.
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| HUMIDIFICATION: |
low pressure steam generator heated with armored electrical heaters, complete with pressure switch and safety valve.
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| DEHUMIDIFICATION: |
by means of smooth tube coil connected to the cooling unit.
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| HUMIDITY CONTROL: |
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.
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| INTERNAL VENTILATION: |
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.
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| POWER BOARD: |
complete with door locking, remote control switches, fuses, magneto-thermal switches, motor thermal protections etc... Positioned inside the building.
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| MACHINE GROUP POSITIONING: |
in a frame placed behind of the chamber, inside the building.
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| CHAMBER WEIGHT: |
2800 Kg approx.
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| NOISE OF MACHINE UNIT: |
78 dB (A) measured at 1 m from the front of the chamber in a non reverberating ambient.
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| ESTIMATED POWER: |
50 KW max, 35 KW average.
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| VOLTAGE: |
380/50/3 + N + G (auxiliary controls with 24 VAC for operator's safety).
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| This system allows carrying on irradiance tests by means of IR lamps. |
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| IR SPOT FRAME: |
made of stainless steel and complete with anti-dropping system
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| IR SPOT DIMENSIONS: |
mm 1100 x 1800 (W x D)
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| IR LAMPS: |
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.
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| 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.
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| LIGHTING: |
OFF, ON splitting into 4 blocks (4 zones) by auxiliary contacts.
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| LAMPS LAYOUT: |
10 rows 6 tiers at 180mm pitches
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