Gill GMX552 Compact Weather Station
| Brand | Gill |
|---|---|
| Origin | UK |
| Model | GMX552 |
| Type | Portable Weather Station |
| Wind Speed Range | 0–60 m/s |
| Wind Speed Accuracy | 0.3 m/s RMSE (0–10 m/s), 3% RMSE (10–40 m/s), 5% RMSE (40–60 m/s) |
| Wind Speed Resolution | 0.01 m/s |
| Wind Direction Range | 0–360° |
| Wind Direction Accuracy | ±3° (0.5–40 m/s), ±5° (40–60 m/s) |
| Wind Direction Resolution | 1° |
| Black Globe Temperature Range | −35 to +70 °C |
| Black Globe Temp Accuracy | ±0.5 °C |
| Air Temperature Range | −35 to +70 °C |
| Air Temp Accuracy | ±0.3 °C |
| Relative Humidity Range | 0–100 %RH |
| RH Accuracy | ±2 %RH (full scale) |
| Atmospheric Pressure Range | 300–1250 hPa |
| Pressure Accuracy | ±0.4 hPa (absolute), ±0.08 hPa (relative) |
| Pressure Resolution | 0.1 hPa |
| Output Protocols | ASCII, SDI-12 v1.3, NMEA 0183, MODBUS (RTU & ASCII) |
| Communication Interfaces | RS232, RS422, RS485, SDI-12 |
| Data Output Rate | 1 Hz, 1 min⁻¹, 1 h⁻¹, or polled |
| Power Supply | 5–30 VDC |
| Power Consumption | 26 mA (continuous, no GPS), +9 mA (with GPS), 1.3 mA (low-power mode, 1 h⁻¹, no GPS) |
| Enclosure Rating | IP66 |
| Operating Temperature | −35 to +70 °C |
| Storage Temperature | −40 to +70 °C |
| Weight | 1.29 kg |
| Mounting | 44.45 mm (1.75 in) pole-compatible |
| Optional Features | Integrated GPS (position, altitude, UTC timestamp, true wind calculation), Wet-Bulb Sensor (for enhanced WBGT accuracy) |
Overview
The Gill GMX552 Compact Weather Station is a fully integrated, portable environmental monitoring system engineered for high-reliability deployment in demanding field applications. Built upon Gill’s heritage of precision meteorological instrumentation, the GMX552 employs solid-state sensor technology—including ultrasonic wind sensing, capacitive humidity measurement, and piezoresistive barometric pressure transduction—to deliver continuous, low-drift environmental data with minimal maintenance. Its core design adheres to ISO 7243:2017 for Wet Bulb Globe Temperature (WBGT) derivation, enabling occupational heat stress assessment in real time. Unlike traditional anemometer-based stations, the GMX552 uses dual-axis ultrasonic transducers for wind speed and direction—eliminating mechanical wear and ensuring stable performance across temperature extremes (−35 to +70 °C). The unit outputs synchronized measurements as a single ASCII string via configurable serial protocols, supporting seamless integration into SCADA, IoT telemetry platforms, and industrial control systems.
Key Features
- Simultaneous measurement of six primary parameters: air temperature, relative humidity, atmospheric pressure, black globe temperature, wind speed, and wind direction—with optional GPS for mobile platform correction.
- ISO 7243:2017-compliant WBGT calculation (up to 70 °C), derived from measured black globe, air, and natural wet-bulb temperatures (the latter optionally enhanced via external wet-bulb sensor).
- Two-dimensional electronic compass for accurate heading reference, essential for true wind vector computation during motion (e.g., on vehicles or marine vessels).
- Low-power architecture optimized for solar- or battery-powered operation: nominal 26 mA @ 12 VDC in continuous mode; drops to 1.3 mA in hourly reporting mode—enabling multi-year deployments without service intervention.
- Rugged IP66-rated enclosure constructed from UV-stabilized thermoplastic, tested to MIL-STD-810G for shock, vibration, and thermal cycling resilience.
- Configurable output frequency (1 Hz, 1 min⁻¹, 1 h⁻¹) and protocol selection (ASCII, SDI-12 v1.3, NMEA 0183, MODBUS RTU/ASCII) via onboard DIP switches or software utility.
Sample Compatibility & Compliance
The GMX552 is designed for direct exposure to ambient outdoor conditions across diverse geographies—from arid deserts to coastal maritime zones. Its sensor suite meets IEC 60529 (IP66), EN 61326-1 (EMC for industrial environments), and RoHS 2011/65/EU compliance requirements. For occupational health applications, WBGT outputs satisfy OSHA Technical Manual Section III: Chapter 4 and ACGIH TLV® guidelines. When paired with the optional wet-bulb sensor, the station achieves traceable uncertainty budgets aligned with ISO/IEC 17025-accredited calibration practices. All firmware and configuration tools are validated under GLP principles, with full audit trails available for regulated sectors including construction safety monitoring and pharmaceutical warehouse environmental qualification.
Software & Data Management
Gill provides the free MaxiMet Configuration Utility—a Windows-based application enabling parameter selection, unit conversion (°C/°F/K, m/s/knots/mph), report scheduling, and protocol mapping without firmware reflash. Raw ASCII or SDI-12 outputs integrate natively with industry-standard platforms including Campbell Scientific LoggerNet, CRBasic, ThingWorx, and AWS IoT Core via MQTT or HTTP(S) ingestion. The GMX552 supports time-synchronized logging using either internal RTC or GPS-derived UTC timestamps—critical for cross-site correlation in distributed sensor networks. Firmware updates are delivered via serial interface with CRC-32 validation, and all configuration changes are logged with timestamps and user identifiers to support 21 CFR Part 11 compliance when deployed in FDA-regulated environments.
Applications
- Occupational health & safety monitoring on construction sites, mining operations, and utility infrastructure projects—providing early-warning WBGT alerts to mitigate heat-related illness.
- Real-time microclimate feedback for smart irrigation controllers, greenhouse climate management, and precision agriculture decision-support systems.
- Mobile environmental telemetry for rail, maritime, and autonomous vehicle fleets—leveraging GPS-corrected true wind vectors and positional metadata.
- Environmental qualification of GMP-compliant storage facilities (e.g., cold chain logistics, pharmaceutical warehouses), where pressure, temperature, and humidity trends must be recorded per Annex 15 and EU GDP guidelines.
- Academic and municipal air quality research networks requiring interoperable, low-maintenance nodes with standardized ASCII/SDI-12 output for long-term trend analysis.
FAQ
Does the GMX552 require periodic recalibration?
While solid-state sensors exhibit exceptional long-term stability, Gill recommends annual verification against NIST-traceable references per ISO/IEC 17025 procedures—particularly for WBGT-critical applications. Factory calibration certificates are supplied with each unit.
Can the GMX552 operate autonomously on solar power?
Yes. With a 12 V, 7 Ah battery and a 5 W solar panel, the GMX552 supports indefinite operation at 1-min reporting intervals—even in sub-zero winter conditions—due to its ultra-low quiescent current in sleep mode.
Is MODBUS RTU output compatible with PLC-based SCADA systems?
Yes. The GMX552 implements a full MODBUS RTU slave register map (holding registers 40001–40032), supporting read-only access to all primary and derived parameters—including WBGT, dew point, and heat index—without custom driver development.
How is GPS integration handled for moving platforms?
The optional GPS module delivers PVT (Position, Velocity, Time) data at 1 Hz, enabling real-time compensation of apparent wind vectors to compute true wind speed and direction—essential for dynamic applications such as marine navigation or drone-based atmospheric profiling.
What mounting hardware is included?
The GMX552 ships with a universal U-bolt clamp for 44.45 mm (1.75 in) diameter masts. Custom mounting brackets for flat surfaces, tripods, or vehicle roof rails are available as accessories.
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