Graywolf IAQ Surveyor II Indoor Air Quality Monitor

Overview

The Graywolf IAQ Surveyor II is a precision-engineered, handheld indoor air quality (IAQ) monitoring system designed for real-time, multi-parameter assessment in commercial buildings, healthcare facilities, laboratories, schools, and HVAC commissioning environments. Built upon a modular sensor architecture, it employs electrochemical sensing for carbon monoxide (CO), non-dispersive infrared (NDIR) spectroscopy for carbon dioxide (CO₂), capacitive polymer humidity sensing, and high-stability thermistor-based temperature measurement — all calibrated traceably to NIST standards. Unlike single-parameter meters, the IAQ Surveyor II delivers synchronized, time-stamped measurements of four foundational IAQ indicators — CO₂, CO, relative humidity (%RH), and ambient temperature — enabling comprehensive thermal comfort and ventilation effectiveness evaluation per ASHRAE Guideline 12 and ISO 16814. Its low-power embedded microcontroller architecture ensures stable operation during extended unattended logging campaigns, while its ergonomic form factor supports one-handed use in constrained mechanical rooms or ceiling plenums.

Key Features

• Simultaneous real-time acquisition of CO₂ (0–5,000 ppm), CO (0–500 ppm), %RH (0–100%), and temperature (−20 to 60 °C) with <1.5% RH and ±0.3 °C typical accuracy
• Dual-probe interface supporting concurrent operation of up to two smart probes — e.g., hot-wire anemometer + K-type thermocouple — without external junction boxes
• Auto-zeroing differential pressure sensor (±100 Pa range, 0.1 Pa resolution) with built-in microbarometer, compliant with ASHRAE 111 and EN 12599 duct static pressure protocols
• Retractable 4-in-1 anemometer probe offering simultaneous velocity (0.15–30 m/s), %RH, temperature, and dew point calculation — calibrated per ISO 7726 Class B
• Configurable data logging: interval-based (1 sec–24 hr), event-triggered (e.g., CO > 35 ppm), or manual snapshot; internal memory stores up to 32,000 timestamped records with UTC synchronization
• WolfSense PC software enables GLP-compliant reporting: audit-trail enabled export (CSV, PDF), trend visualization, ASHRAE 62.1 ventilation rate calculation, and customizable pass/fail thresholds
• Ruggedized IP54 enclosure with overmolded rubber grip, glove-friendly tactile buttons, and 128×64 graphical LCD featuring wide-view-angle backlighting and auto-updating display on probe insertion

Sample Compatibility & Compliance

The IAQ Surveyor II is validated for continuous monitoring of conditioned indoor air across diverse occupancy types — from low-emission office spaces to high-humidity hospital isolation rooms and particle-controlled cleanrooms. Its sensor suite meets the functional requirements of ISO 16814 (Indoor Air Quality — General Principles), ASTM D6245 (Standard Practice for Using Indoor Air Quality Investigation Methodology), and ASHRAE Standard 62.1-2022 (Ventilation for Acceptable Indoor Air Quality). All electrochemical and NDIR sensors are factory-calibrated against certified reference gases and include onboard calibration verification routines. The device supports FDA 21 CFR Part 11–compliant data integrity when used with WolfSense’s electronic signature and audit trail modules — making it suitable for GMP-regulated pharmaceutical facility environmental monitoring programs.

Software & Data Management

Data transfer occurs via RS-232 serial interface to WolfSense v4.x PC software — a Windows-based platform engineered for technical users requiring traceable, auditable IAQ documentation. The software enforces structured metadata capture (operator ID, location tag, sampling protocol), automatic unit conversion, and statistical summary generation (min/max/mean/stdev per parameter). Raw logs retain full temporal resolution and sensor status flags (e.g., “CO sensor warm-up active”). Export formats include CSV (for Excel/LabVIEW integration), PDF reports with header/footer branding, and XML for LIMS ingestion. Firmware updates and sensor configuration (e.g., CO alarm threshold, logging interval) are performed directly through the software interface, eliminating the need for proprietary service tools.

Applications

• HVAC system commissioning and TAB (Testing, Adjusting, Balancing) verification per NEBB and AABC standards
• Occupancy-based demand-controlled ventilation (DCV) validation using CO₂ decay rate analysis
• Post-renovation indoor air contaminant screening (e.g., CO spikes during equipment startup)
• Thermal comfort mapping per ISO 7730 and ANSI/ASHRAE 55 using simultaneous RH/temperature/velocity data
• Compliance auditing for LEED IEQ Credit 1 (Outdoor Air Delivery Monitoring) and WELL Building Standard W02
• Long-term baseline IAQ studies in educational institutions and senior care facilities

FAQ

What is the recommended calibration frequency for the IAQ Surveyor II?
Graywolf recommends annual NIST-traceable calibration for CO and CO₂ sensors, with humidity and temperature sensors verified semiannually using certified hygrometers and dry-well calibrators. Field zero checks for CO₂ and CO may be performed before each critical measurement campaign.

Can the IAQ Surveyor II be integrated into a building management system (BMS)?
While the device does not support native BACnet or Modbus protocols, its RS-232 output can be interfaced via third-party protocol converters for periodic data polling. Real-time streaming requires custom middleware development.

Is the WolfSense software compatible with macOS or Linux?
WolfSense is a Windows-only application (Windows 10/11, 64-bit). Virtualization or Boot Camp is required for macOS deployment; no native Linux support exists.

Does the instrument meet OSHA or NIOSH exposure limit reporting requirements?
The IAQ Surveyor II provides raw concentration data aligned with OSHA PELs and ACGIH TLVs for CO and CO₂. However, formal compliance documentation (e.g., 8-hour TWA calculations) requires post-processing in WolfSense or external occupational hygiene software.