Gill Instruments

MaxiMet GMX500

ClimateMeteorological Station & Sensors

Measures wind speed & direction (via ultrasonic sensor, no moving parts)

Electronic compass for alignment / orientation
Optionally GPS for true wind & positional data
Temperature, humidity, pressure onboard

Quantity

Overview

The Gill MaxiMet GMX500 is a compact, all-in-one weather station that measures wind speed and direction, temperature, humidity, and barometric pressure using solid-state sensors. It features an ultrasonic anemometer, optional GPS and compass, multiple communication protocols (like RS485, Modbus, NMEA), and is built for reliable, low-maintenance operation in harsh outdoor environments. With an IP66-rated housing and optional heating, it's ideal for agriculture, environmental monitoring, smart cities, and remote installations.

Typical applications

Control systems including smart buildings, agriculture and industry
Solar farms
Road and rail
Ports and harbours
Reporting systems for transport and safety
Low power/solar powered deployments and IoT applications

Key Features

Five measured parameters: Wind speed & direction, temperature, humidity, pressure, optional heating, optional GPS function
Multiple additional derived parameters based on combining measured parameters, such as gust, average wind speed and dew point
High quality, accurate, solid-state sensors
2-axis compass
Optional integrated GPS capability available to provide location, GPS timestamp and a calculation of true wind if the platform is moving
Optional low power heating

Benefits

High quality measurement data due to careful sensor selection and extensive design testing and verification
Easy to set-up and integrate using comprehensive software to select the reported and derived parameters and measurement units required
Easy to install and long operational life, due to a compact, robust design and the selection of low maintenance sensors
Suitable for use with battery or solar systems in low power mode

Specifications


WIND SPEED
Range	0-60 m/s
Accuracy	0-10 m/s 0.3 m/s RMSE 10-40 m/s 3% RMSE 40-60 m/s 5% RMSE
Resolution	0.01 m/s
Starting threshold	0.01 m/s
Units of measurement	m/s, km/h, mph, kts, ft/min

WIND DIRECTION
Range	0-360°
Accuracy	0.5 m/s-40 m/s ±3 ° 40-60 m/s ±5
Resolution	1°
Units of measurement	degrees

OUTPUTS
Digital comms modes	RS232, RS422 RS485, SDI-12
Protocols	ASCII, SDI-12 v1.3, NMEA 0183 MODBUS (RTU and ASCII)
Data outputs rates	1/s, 1/min, 1/hour, or polled

POWER SUPPLY

Input voltage

5-30 VDC (10-30 VDC for heated models)

Average current consumption @ 12 VDC

26 mA continuous mode (std unit)

400 mA total with heating

+9 mA with GPS option

1.3 mA eco-power mode (no GPS, 1/hr)

MECHANICAL
Construction	UV stabilized thermoplastic
Fittings	Fit to 44.45 mm (1.75 in) pole or mast
Weight	0.7 kg
Connector type	9-way clipper connector

ENVIRONMENTAL
Protection class	IP66
Operating temp.	-35°C to +70°C
Storage temp.	-40°C to +70°C with heating option

STANDARD EQUIPMENT (supplied with product)

MaxiMet product

Mating connector

MetSet software*, to set-up and configure MaxiMet (comms mode, measurement units, reporting intervals, derived parameters, etc.)

MetView software*, to view reported parameters

MaxiMet User Manual*

* Downloadable from Gill Instruments website

OPTIONS
GPS	Available as an option. Enables reporting of location, height, real time clock, true wind (for vehicle mounting applications
Heating	Available as an option for operation in extremely low temperatures

WARRANTY
Warranty	24 months

AIR TEMPERATURE
Range	-40°C to +70°C with heating
Accuracy	±0.3°C
Resolution	0.1°C
Units of measurement	°C, °F, K

RELATIVE HUMIDITY
Range	0-100% RH
Accuracy	typically, ±2% RH across full range
Resolution	0.1% RH
Units of measurement	% RH, g/m3

BAROMETRIC PRESSURE
Range	300-1250 hPa
Accuracy 900-1100 hPa, 25-40°C	Absolute (typically) ±0.4 hPa Relative (typically) ±0.08 hPa
Resolution	0.1 hPa
Units of measurement	hPa, mbar, mmHg, inHg