Tenney Series Environmental Test Chambers

Overview

The Tenney Series Environmental Test Chambers are precision-engineered climatic simulation systems designed for rigorous laboratory, quality assurance, and product validation applications. Built to meet the demanding requirements of aerospace, automotive, electronics, pharmaceutical, and defense industries, these chambers employ a dual-loop control architecture—separately regulating temperature and relative humidity (RH) with high fidelity. Temperature is controlled via a nickel-chromium open-coil heating system coupled with a semi-hermetic refrigeration circuit, while humidity is managed through the proprietary Tenney VaporFlo™ saturated steam generator, which delivers rapid, stable, and contamination-free moisture without wet-bulb sensors or external water reservoirs. The chamber’s interior features 100% stainless steel construction with non-asbestos insulation, ensuring long-term corrosion resistance, thermal stability, and compliance with cleanroom-grade material handling protocols. Equipped with platinum resistance thermometers (PRTs) and capacitive RH sensors, the system achieves post-stabilization control accuracy of ±0.3 °C and ±2% RH—performance validated per ASTM E145 and ISO 16750-4 test standards.

Key Features

• Versa Tenn® proprietary microprocessor-based control system with intuitive interface and real-time setpoint adjustment
• Tenney VaporFlo™ humidity generation system: dry-steam injection with zero reliance on wet-bulb assemblies or continuous water supply
• 100% electropolished stainless steel internal chamber walls, floor, and ceiling—welded seams, radius corners, and seamless coving for GMP-compliant cleaning
• Non-asbestos, low-outgassing mineral fiber insulation rated for continuous operation from –70 °C to +180 °C
• Vertical downward airflow pattern with turbulence-free laminar distribution—optimized for uniform thermal/hygrometric profiles (per IEC 60068-3-5)
• Dual-silicone gasketed door seal with automatic defrost function on door perimeter heater strips
• Watlow 942 programmable controller featuring PID tuning, alarm logging, and configurable ramp/soak profiles
• Nichrome open-coil heating elements with over-temperature cutout and independent thermal fusing
• Semi-hermetic refrigeration system compatible with optional water-cooled condensers or LN₂/CO₂ auxiliary cooling for accelerated thermal transitions

Sample Compatibility & Compliance

The Tenney Series accommodates diverse sample geometries—including PCB assemblies, medical devices, polymer components, and packaged consumer goods—via fully adjustable, stainless steel pull-out shelves with load-rated support. Chamber ports (standard or custom-configured) allow integration of instrumentation feedthroughs, glove ports, or purge gas inlets (e.g., GN₂ for oxygen-sensitive testing). All models comply with UL 61010-1, CSA C22.2 No. 61010-1, and CE marking requirements. Optional configurations support FDA 21 CFR Part 11–compliant electronic records (when paired with validated LinkTenn™ software), GLP/GMP audit trails, and ISO/IEC 17025 traceability documentation packages. Humidity control down to 5% RH at 20 °C is achieved using an integrated surface desiccant dryer—critical for hygroscopic material preconditioning per IPC-TM-650 2.6.3.

Software & Data Management

LinkTenn™ software (Windows-compatible, originally developed for Windows 95 but continuously updated for modern OS environments) provides full remote monitoring, profile programming, data export (CSV, XML), and alarm event correlation. Communication interfaces include RS-232/422/485, IEEE-488 (GPIB), and optional Ethernet-to-serial gateways. The system supports time-stamped data logging with ≥10,000-point memory buffer and configurable sampling intervals (1 s to 60 min). Audit trail functionality records all operator actions, parameter changes, and calibration events—meeting ALCOA+ principles for data integrity. Optional IEEE-488 integration enables synchronization with external DAQ systems or automated test stands in ATE environments.

Applications

• Temperature-humidity stress screening per MIL-STD-810H Method 507.6 and JEDEC JESD22-A110
• Accelerated aging of adhesives, coatings, and elastomers under cyclic THB (Temperature-Humidity-Bias)
• Pre-conditioning of lithium-ion battery cells prior to electrical characterization
• Stability testing of sterile barrier packaging per ISO 11607
• Environmental qualification of avionics modules per DO-160 Section 4 and 5
• Validation of HVAC filter media performance across defined RH gradients
• Corrosion resistance evaluation of metallic substrates under salt-spray + humidity hybrid protocols

FAQ

What is the standard temperature and humidity range for the Tenney Series?
Standard operating range spans –70 °C to +180 °C and 10–95% RH; extended low-RH capability (down to 5% RH at 20 °C) is available with desiccant dryer option.
Does the chamber support automated compliance reporting for ISO/IEC 17025 labs?
Yes—when configured with validated LinkTenn™ software and calibrated sensor package, it generates NIST-traceable calibration certificates and uncertainty budgets compliant with ILAC P14 requirements.
Can the system be integrated into a centralized facility monitoring network?
Absolutely—via RS-485 Modbus RTU or optional Ethernet/IP gateway, enabling SCADA-level visibility and centralized alarm aggregation.
Is the VaporFlo™ humidity system suitable for cleanroom-class testing?
Yes—the dry-steam generator introduces no particulates, microorganisms, or dissolved solids, making it appropriate for Class 1000 (ISO 6) and tighter controlled environments.
What safety protections are built into the chamber’s thermal management system?
Dual independent over-temperature cutoffs (mechanical and electronic), refrigerant pressure monitoring, door-open interlock, and real-time ground-fault detection per UL 61010-1 Clause 7.3.3.