Environmental Specialties Stability and Humidity Chambers

• Closed-cell urethane insulation for superior high/low temperature stability and minimal heat transfer. The door is also completely foamed for thermal performance and rigidity.
• Heavy-duty door hinges, full peripheral magnetic door gaskets and positive action latch with a lock to maintain a secure, uniform seal.
• Air-cooled, hermetically sealed compressor with environmentally safe, non-toxic, CFC-free refrigerants. Optional water-cooled units are available.
• Expansion valve refrigeration control provides higher heat removal capacity than conventional capillary tube designs and provides immediate response to added heat loads.
• Automatic time or temperature actuated hot gas/electric defrost provide with “intelligent” adaptive defrost timer; time or temperature initiated and time or temperature terminated. By sensing chamber coil temperature, the timer allows for minimum temperature rise due to a defrost cycle.
• Relative humidity configuration in % RH (if applicable).
• Precision, platinum RTD temperature sensor calibrated per NIST traceable standards.
• Solid-state variable capacitance humidity sensor calibrated per NIST traceable standards.
• High output vapor generator providing precisely controlled humidification. A fully stainless steel tank (type 316), incoloy heater and float switch actuated solenoid fill system are notable features.
• Compressed air tower (CDM-AT) or desiccant-wheel drier (CDMD) models offering extended low range dehumidification capability.
• “Intelligent” enabling / disabling of humidification and dehumidification. Humidification is disabled below freezing, and dehumidification is disabled at factory-selected conditions where drying is not required.
• Alarm notification through a red screen background, activation of an audible alarm, the switching of a remote alarm contact set, and the creation of an alarm log with time, date, and type of alarm.
• Alarm silence function on all parameters with up to 60 minutes of delay time (individually adjusted for each parameter). The alarm mode deactivates upon return to normal operating limits.
• Independent time delay action for each alarm parameter. Alarm action delays and audible alarm delays are each adjustable from 0 to 60 minutes in 1 minute increments. ‘Common alarm’ contacts activate after alarm action delay (Form C relay – N.O. and N.C. contacts provided).
• Quick disconnect wiring for easy installation and removal of most mechanical and electrical assemblies.
• Detailed computer generated schematic provided with Operation Manual to aid in field servicing & troubleshooting.
• Conformance to the FDA 21 CFR 11 requirements for data recording, audit trails of controller settings modification, alarm history logs, operator event logs and secure file transfers. Operating data is encrypted and stored in user defined time length log files, and can be viewed on the touch-screen, or remotely by PC. Password protection provides multiple levels of user access and defined rights. Password aging and re-authentication for process changes are also provided per 21 CFR 11 specifications. High level encryption and digital signatures are supported for paperless operation.
• Real-time trending of temperature and humidity parameters and set points. The touch-screen provides auto-scaled and user definable scaled plots over a 1 minute to 12 hour time period. A ‘drag and zoom’ feature allows for magnified views within a specific plot period. The trend graphs can be printed by pressing an on-screen print icon and connecting an optional printer. Historical data logging is provided with the paperless recording option activated at the factory.
• Interface USB port for data transfer to printer or removable memory stick to maintain local ‘paper trail’ requirements. A touch-screen ‘print’ icon allows one touch printout of data trends in report or graphic format. The removable memory stick allows export and import of profiles, alarm files, audit trail files, and other data files. File utilities are available with the paperless recording option activated at the factory.
• Nichrome wire duct style heater providing quick, accurate response.
• Modular plug-in element design for quick disconnect capability.
• Dual over-temp safeties provided for chamber, compressor and product protection.

Special Chamber Options

Reach-In Chambers can be equipped with many options and variations including the following:

• CO2
• Explosion Safe
• Low RH
• Frost-Free
• 4-Bank lighting for Photostability
• Back wall lighting for product inspection
• Cascading water fill system for concrete testing
• Rapid cycling for electronics testing