Thermo Fisher Forma™ Series Temperature and Humidity Controlled Environmental Chambers

Overview

The Thermo Fisher Forma™ Series Temperature and Humidity Controlled Environmental Chambers are precision-engineered laboratory instruments designed for long-term stability testing, microbiological cultivation, pharmaceutical product shelf-life assessment, and controlled environmental simulation. These chambers operate on a dual-control principle—integrating independent, microprocessor-regulated temperature and relative humidity (RH) systems—to maintain highly reproducible conditions across extended durations. Unlike basic incubators, the Forma™ series employs true laminar airflow architecture with side-mounted plenum chambers, ensuring uniform thermal distribution and minimizing localized gradients. Humidity control is achieved via an integrated steam generator (standard on models 3913, 3940, and 3949; not available on 3920), enabling precise RH modulation from ambient levels up to 95% at 37°C. The system’s robust insulation—5.1 cm (2″) thick, CFC-free, in-situ poured polyurethane—combined with cold-rolled steel construction and phenolic-coated evaporator coils, supports operation in demanding applications involving corrosive byproducts or stringent regulatory environments.

Key Features

• Microprocessor-based digital controller with programmable ramp-and-hold cycles for both temperature and humidity
• True stratified airflow design with side plenum chambers for superior temperature uniformity and stability
• Steam-based humidification system (models 3913/3940/3949) delivering consistent RH control up to 95% at 37°C
• Stainless steel interior chamber with solid, adjustable stainless steel shelves and horizontal airflow ducting
• Visual and audible alarm system triggered by temperature deviation, humidity drift, or sensor fault (excluded on model 3920)
• Manual defrost and refrigeration cycle management for enhanced system longevity and maintenance predictability
• Locking casters and adjustable leveling feet for secure positioning and ease of relocation during lab reconfiguration
• CFC-free polyurethane foam insulation (5.1 cm thickness) for energy efficiency and thermal integrity

Sample Compatibility & Compliance

The Forma™ environmental chambers accommodate a broad range of sample formats—including Petri dishes, flasks, vials, trays, and stacked culture vessels—within their 11 cu. ft. (311 L) and 29 cu. ft. (821 L) configurations. Their stainless steel interiors and corrosion-resistant evaporator coating make them suitable for applications generating acidic or halogenated vapors. From a regulatory standpoint, these units support GLP- and GMP-aligned workflows when paired with validated accessories (e.g., calibrated external probes, audit-trail-capable data loggers). While the base unit does not include 21 CFR Part 11-compliant software, optional chart recorders (e.g., models 197075, 201144–201147) and third-party validation packages enable traceable, compliant data acquisition. The chambers meet applicable IEC 61010-1 safety standards and are designed to facilitate IQ/OQ/PQ protocol execution in regulated life science laboratories.

Software & Data Management

Standard operation relies on an intuitive front-panel interface with real-time display of setpoints, actual values, and alarm status. For advanced monitoring, the Forma™ series integrates seamlessly with Thermo Fisher’s optional analog/digital data loggers and IR-based CO₂ sensors (e.g., for hybrid environmental-CO₂ applications). Compatible recording devices—including 6″ and 12″ temperature chart recorders—provide continuous analog output suitable for archival compliance. Users may also deploy external Class A or NIST-traceable probes via dedicated access ports, enabling concurrent multi-point validation. Though native firmware lacks built-in electronic audit trails, integration with validated third-party SCADA or LIMS platforms permits full 21 CFR Part 11 compliance when configured per organizational SOPs.

Applications

• Pharmaceutical stability testing per ICH Q1 guidelines (long-term, accelerated, intermediate conditions)
• Microbial growth studies under defined temperature/humidity regimes (e.g., ISO 11133, USP <61>)
• Material aging and packaging compatibility assessments
• Seed germination and plant tissue culture preconditioning
• Environmental stress screening for electronic components and medical devices
• Controlled degradation studies for biologics, vaccines, and excipient formulations

FAQ

Which models include humidity control capability?
Models 3913, 3940, and 3949 are equipped with integrated steam generators for active humidity control. Model 3920 operates as a temperature-only chamber and does not support humidification.

What is the maximum achievable humidity level and at what temperature?
The system achieves up to 95% RH at 37°C. Humidity performance declines outside this reference point; precise RH limits vary with set temperature and chamber loading—consult the technical manual for psychrometric curves.

Are the shelves adjustable and load-rated?
Yes. All models feature solid stainless steel shelves with infinite vertical adjustability. Optional reinforced shelves (e.g., part #224161) and dual-oscillator support trays (part #1900005) are rated for higher static loads and dynamic applications.

Can external sensors be connected for independent verification?
Yes. Dedicated access ports allow insertion of calibrated thermistors, hygrometers, or CO₂ probes without compromising chamber integrity. This supports routine calibration verification and qualification protocols.

Is remote monitoring supported out of the box?
Native Ethernet or Wi-Fi connectivity is not included. However, analog voltage outputs (0–5 V or 4–20 mA) are available on select recorder-compatible configurations, enabling integration into existing building management or lab automation systems.