Graywolf RH-AS2 Portable Environmental Monitoring Instrument

Overview

The Graywolf RH-AS2 is a handheld, high-integrity environmental monitoring instrument engineered for precision measurement of thermodynamic and hygrometric parameters in real time. It operates on the principle of dual-sensor psychrometry—integrating a calibrated platinum resistance thermometer (Pt100 or equivalent) and a capacitive polymer humidity sensor—to compute primary and derived moisture-related metrics with traceable accuracy. Designed for field-deployable use in HVAC commissioning, cleanroom validation, indoor air quality (IAQ) assessments, and laboratory environmental monitoring, the RH-AS2 delivers rapid thermal equilibrium response (<15 s for 90% step change in RH at 23 °C) and maintains stability across wide operating ranges (0–50 °C, 0–100% RH). Its architecture supports ISO 14644-1, ISO 14644-3, and ASHRAE Standard 110-compliant environmental verification workflows, enabling users to meet regulatory documentation requirements for GxP environments.

Key Features

• Integrated multi-parameter calculation engine: simultaneously outputs temperature (°C/°F), relative humidity (%RH), wet-bulb temperature (°C), dew-point temperature (°C), absolute humidity (g/m³), specific humidity (g/kg dry air), and mixing ratio (g water/kg dry air).
• Wolf OS embedded operating system: real-time multithreaded firmware supporting concurrent data acquisition, annotation, and local storage without PC dependency.
• Modular probe interface: compatible with Graywolf’s suite of calibrated accessories—including anemometers (e.g., FA-100 series), particulate counters (e.g., P-500), and CO₂ sensors—enabling unified environmental mapping via a single host platform.
• Field annotation capability: voice memos, timestamped text notes, and JPEG image capture synchronized to measurement events—fully auditable and exportable with metadata.
• Ruggedized industrial design: IP54-rated enclosure, lithium-polymer battery (≥12 h continuous operation), and USB-C + Bluetooth 5.0 connectivity for secure wireless data transfer.

Sample Compatibility & Compliance

The RH-AS2 is intended for gaseous ambient sampling in non-corrosive, non-explosive indoor and semi-outdoor environments. It complies with IEC 60751 (temperature sensor accuracy class B), IEC 61280-2-9 (humidity sensor long-term drift specification ≤0.5 %RH/year), and RoHS 2011/65/EU. Calibration certificates are NIST-traceable and include uncertainty budgets per ISO/IEC 17025:2017. The device supports GLP/GMP audit trails through encrypted internal logging with immutable timestamps, satisfying FDA 21 CFR Part 11 requirements when used with validated software configurations. It is routinely deployed in ISO Class 5–8 cleanrooms, pharmaceutical manufacturing suites, and university research laboratories undergoing AAALAC or CAP accreditation.

Software & Data Management

Data management is performed via Graywolf’s proprietary WolfLink Desktop Suite (v4.2+), which imports native .wlf binary files and converts them into CSV, PDF report templates, or Excel-compatible XLSX formats. The software implements hierarchical project organization, statistical summary dashboards (min/max/avg/stdev per parameter), trend line overlays, and deviation flagging against user-defined thresholds. All annotations—text, audio, and images—are embedded as discrete metadata objects linked to individual measurement records. Audit logs record operator ID, calibration status, firmware version, and file modification history. Exported reports include automatic inclusion of instrument ID, calibration due date, and measurement uncertainty statements.

Applications

• HVAC system balancing and TAB (Testing, Adjusting, Balancing) reporting per NEBB standards.
• Cleanroom environmental qualification (IQ/OQ/PQ) per ISO 14644-2 Annex B protocols.
• Pharmaceutical warehouse temperature/humidity mapping studies aligned with WHO TRS 992 Annex 9.
• Archival storage environment monitoring for libraries and museums (per ANSI/NISO Z39.77).
• Academic and industrial research requiring synchronized multi-parameter environmental baselines (e.g., material stability testing, biological incubator validation).

FAQ

Is the RH-AS2 suitable for outdoor use?

Yes, provided ambient conditions remain within its specified operating range (0–50 °C, 0–100% RH) and the unit is protected from direct precipitation and solar loading during measurement.
Can the device be calibrated onsite by the user?

No—calibration requires traceable reference standards and environmental chamber control; only authorized Graywolf service centers or ISO/IEC 17025-accredited labs may perform full recalibration. Field verification using check points (e.g., saturated salt solutions) is supported.
Does Wolf OS support third-party software integration?

Limited API access is available via serial command protocol (RS-232 over USB-C); full interoperability with LabVIEW, Python (PySerial), or SCADA systems requires prior validation under Graywolf’s Integration Partner Program.
What is the memory capacity for stored measurements?

Internal flash storage holds up to 1 million timestamped records (12 parameters × 10 Hz sampling for >27 hours continuously) before rollover or manual export.
Is firmware update capability included?

Yes—over-the-air updates are delivered via WolfLink Desktop Suite and require cryptographic signature verification to ensure integrity and compliance with IEC 62443-3-3 security requirements.