LabCompanion SH Series Salt Spray Test Chamber

Overview

The LabCompanion SH Series Salt Spray Test Chamber is an engineered environmental test system designed to evaluate the corrosion resistance of coated, plated, anodized, and passivated metallic and non-metallic surfaces under accelerated saline atmospheric conditions. Operating on the principle of continuous or cyclic salt fog generation via compressed air-driven atomization—governed by Bernoulli’s principle—the chamber delivers reproducible, standardized corrosive exposure in strict accordance with internationally recognized test protocols including ASTM B117 (Neutral Salt Spray), ISO 9227 (NSS, AASS, CASS), JIS Z2371, and GB/T 2423.17. The system maintains precise thermal control across both the test chamber and saturated air tank using dual independent PID + PWM + SSR regulation loops, achieving temperature stability within ±0.5 °C and uniformity within ±2 °C. Constructed with corrosion-resistant materials—including 8 mm thick reinforced PVC chamber walls and a SUS#304 stainless steel saturated air tank—the SH Series ensures long-term structural integrity and chemical inertness during extended operational cycles.

Key Features

• Engineered dual-zone temperature control: Independent PID-regulated heating for both test chamber (35 °C ±1 °C for NSS; 50 °C ±1 °C for CASS) and saturated air tank, ensuring consistent fog saturation and droplet morphology.
• Bernoulli-effect spray nozzle system: Delivers uniform, gravity-fed salt mist deposition at 1–2 mL/80 cm²·h, with inter-sample variation controlled within ±0.3–0.9 mL/80 cm²·h per collection interval.
• Robust chamber architecture: 8 mm PVC interior with circumferential band reinforcement prevents warping, leakage, or dimensional drift over decades of service—even under continuous 50 °C operation.
• Front-access modular drainage: Independent drain ports for solution reservoir, saturator, and overflow channels minimize cross-contamination and simplify maintenance without disassembly.
• Dual-sensor safety redundancy: EGO (electro-mechanical overheat cut-off) and PT100 platinum resistance thermometer provide fail-safe thermal monitoring for both chamber and saturator zones.
• Integrated de-fogging function: Rapid condensate evacuation from the transparent acrylic viewing lid eliminates post-test visual obstruction and accelerates chamber readiness for subsequent cycles.
• Flexible water supply interface: Supports both automated solenoid-controlled fill and manual bypass—critical for uninterrupted testing during municipal water interruptions.

Sample Compatibility & Compliance

The SH Series accommodates flat, angular, or irregularly shaped specimens up to 2000 mm wide (SH-200 model), mounted on adjustable PVC or PP sample racks. All internal wetted surfaces resist chloride-induced degradation, enabling reliable assessment of electrophoretic coatings, zinc-nickel plating, chromate conversion layers, and organic polymer films. The system meets full functional compliance with ASTM B117 Annex A1 (fog collection methodology), ISO 9227 Clause 6 (chamber calibration requirements), and JIS Z2371 Section 4 (test condition verification). Optional traceable calibration certificates are available per ISO/IEC 17025-accredited procedures. For regulated industries, the controller supports audit-ready event logging—including temperature deviations, power interruptions, and door-open events—with timestamped records exportable via USB for GLP/GMP documentation.

Software & Data Management

While the base SH Series employs a dedicated digital PID controller with membrane keypad input and dual 4-digit LED displays (chamber and saturator temperatures), optional firmware upgrades enable RS-485 Modbus RTU communication for integration into centralized lab management systems. Logged parameters—including real-time temperature traces, spray duration, cycle count, and fault codes—are stored in non-volatile memory for ≥30 days. When paired with LabCompanion’s optional DataBridge™ software (sold separately), users can generate automated compliance reports aligned with FDA 21 CFR Part 11 requirements—featuring electronic signatures, audit trails, and role-based access controls. All firmware adheres to IEC 61508 SIL-2 functional safety standards for industrial control logic.

Applications

This chamber is routinely deployed in quality assurance laboratories for validation of corrosion protection systems on automotive fasteners, aerospace aluminum alloys, marine-grade stainless steels, printed circuit board conformal coatings, and medical device housings. It supports R&D workflows evaluating inhibitor efficacy in rust-preventive oils, comparative screening of electroplated layer thicknesses (e.g., 5 µm vs. 12 µm zinc), and qualification of multi-layer coating stacks per OEM specifications (e.g., Ford WSK-M2G224-A2, GMW14872). In academic settings, it facilitates studies on galvanic coupling behavior between dissimilar metals and pH-dependent chloride attack kinetics on passive oxide films.

FAQ

What international standards does the SH Series fully support?
ASTM B117, ISO 9227 (NSS/AASS/CASS), JIS Z2371, CNS 4797, and GB/T 2423.17—all verified via third-party chamber mapping and fog deposition audits.
Can the SH Series operate continuously for 1,000-hour tests?
Yes. The reinforced PVC chamber, dual thermal protection, and sealed saturator design enable unattended operation across extended durations when maintained per scheduled service intervals.
Is the salt solution concentration monitored automatically?
No. Solution concentration (typically 5.0 ± 0.1 wt% NaCl for NSS) must be verified manually using calibrated refractometry or conductivity meters prior to each test cycle.
Does the system include fog collection funnels and graduated cylinders?
Yes. Each unit ships with two ISO-standard 100 cm² glass funnels, a 100 mL calibrated cylinder, and a PVC specimen rack rated for 20 kg loading capacity.
What maintenance is required for the saturated air tank?
Monthly descaling with 5% citric acid solution is recommended to prevent calcium carbonate buildup; stainless steel construction ensures compatibility with standard cleaning agents.