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Compact weather stations

Multiple measurements. One integrated platform.

MaxiMet combines meteorological measurements in a compact, integrated weather station, giving engineers a practical way to collect the environmental data their application needs without building a system from separate instruments.

Depending on configuration, MaxiMet measures wind speed and direction, temperature, humidity, pressure, precipitation and solar radiation, with selected models also providing compass, GPS, heating and derived meteorological parameters.

We aim to respond in one working day.

MaxiMet GMX603 compact weather station

Rain and solar on board

Optical rainfall and solar radiation, by model

No moving parts

Ultrasonic wind, no cups or vanes

Temperature, humidity, pressure

Inside the louvred radiation shield

One cable, one output

RS232, RS422, RS485, SDI‑12, Modbus

  • Several parameters, one instrumentUp to six measurements from a single mounting point
  • Low-power operationEco Mode for solar and battery sites
  • Heat-stress monitoringGMX552 measures WBGT and TWL for worker safety
  • Sealed to IP66IP68 on MaxiMet Marine

The challenge

Weather rarely arrives as one measurement

A wind reading tells you what the air is doing. Temperature and humidity add context. Pressure changes the picture again. Add precipitation or solar radiation and the same installation can become a much more useful source of environmental information.

The engineering challenge is not simply to measure more. It is to gather the measurements that matter without turning the installation into a collection of separate instruments, cables, interfaces and maintenance requirements.

MaxiMet brings multiple measurements together in a compact platform, with different configurations allowing the station to be specified around the application rather than forcing every installation into the same specification.

Ultrasonic wind, no moving parts

No cups, bearings or vanes to wear out, lubricate or replace.

One unit, one cable

One output string into your logger, PLC or network.

IP66 across the range

IP68 on the marine GMX260 and GMX560.

Derived parameters built in

Dew point, wind chill, air density, true wind and WMO averages.

Choose your MaxiMet

Start with the measurements, not the model number

Every MaxiMet is the same instrument with a different measurement set. Tick what you need and the range narrows to the models that measure all of it.

I need14 models match
Built to orderMaxiMet GMX240

GMX240

WindRain

Wind and rainfall, with no temperature, humidity or pressure.

Wind plus optical rainIP66 · 0.5 kg
MarineMaxiMet GMX260

GMX260

Wind6-axis compass

Wind with a 6-axis compass for moving platforms. IP66 and IP68.

MaxiMet MarineIP66 · 0.5 kg
Built to orderMaxiMet GMX300

GMX300

T/H/P

Temperature, humidity and pressure, with no wind.

T/H/P onlyIP66 · 0.5 kg
Built to orderMaxiMet GMX301

GMX301

Solar

Solar radiation only, ISO 9060 Class C. Does not measure temperature, humidity or pressure.

Pyranometer nodeIP66 · 0.6 kg
Built to orderMaxiMet GMX400

GMX400

T/H/PRain

Temperature, humidity, pressure and rainfall, with no wind.

T/H/P plus optical rainIP66 · 0.5 kg
Most specifiedMaxiMet GMX500

GMX500

WindT/H/P

Wind plus temperature, humidity and pressure. The standard MaxiMet.

The most specified modelIP66 · 0.7 kg
Built to orderMaxiMet GMX501

GMX501

WindT/H/PSolar

The GMX500 set plus solar radiation.

Adds solarIP66 · 0.8 kg
Built to orderMaxiMet GMX550

GMX550

WindT/H/PRain

The GMX500 set plus rainfall, optical or tipping bucket.

Pairs with TruMet PW100IP66 · 0.7 kg
Built to orderMaxiMet GMX551

GMX551

WindT/H/PRainSolar

Wind, T/H/P, rainfall and solar radiation. The most comprehensive integrated model.

Pairs with TruMet PW100IP66 · 0.8 kg
Heat stressMaxiMet GMX552

GMX552

WindT/H/PWBGTTWL

Wind and T/H/P plus black globe temperature, WBGT and Thermal Work Limit (TWL).

MaxiMet Heat StressIP66 · 1.29 kg
MarineMaxiMet GMX560

GMX560

WindT/H/P6-axis compass

Wind, T/H/P and a 6-axis compass for vessels, buoys and offshore. IP66 and IP68.

MaxiMet MarineIP66 · 0.7 kg
Built to orderMaxiMet GMX600

GMX600

WindT/H/PRain

Wind, temperature, humidity, pressure and optical rainfall, 0 to 300 mm/hr.

Optical rainIP66 · 0.8 kg
LatestMaxiMet GMX603

GMX603

WindT/H/PRain

The GMX500 set with the most accurate rainfall, 5% or better.

TruMet rainfall built inIP66 · 1.1 kg
Not sure which set you need? Our team will tell you in one reply.Speak to our team

Specialist platforms

Two MaxiMet platforms built for one job each

Moving platforms and heat-stress monitoring each need something the standard range does not do. These two platforms do it.

MaxiMet GMX260MaxiMet GMX560
MaxiMet Marine

Built for vessels, buoys and offshore platforms

  • 6-axis compass keeps direction true on a moving platform
  • IP68 as well as IP66, for salt, spray and immersion risk
  • GMX260 measures wind. GMX560 adds temperature, humidity and pressure
MaxiMet GMX552
MaxiMet Heat Stress

WBGT and TWL for worker safety

  • Wet Bulb Globe Temperature (WBGT) from one instrument
  • Thermal Work Limit (TWL) to set safe work rates in the heat
  • Black globe temperature, wind, temperature, humidity and pressure in the same unit
ModelsGMX552

Compare

Side by side, by the job you need it to do

Four common jobs, the models that do them, and only the figures that separate them. Every figure is from the released datasheet.

SpecificationCore weatherGMX500Adds rainfallGMX550Most accurate rainfallGMX603Rainfall and sunlightGMX551
Choose it whenWind, temperature, humidity and pressure are enoughYou need rainfall with core weatherRainfall accuracy matters mostYou want everything from one instrument
Wind0 to 60 m/s0 to 60 m/s0 to 60 m/s0 to 60 m/s
RainfallNoOptical or tipping bucketOptical, 0 to 200 mm/hr, 5% or betterOptical or tipping bucket
Solar radiationNoNoNo0 to 1600 W/m²
HeatingOptional, transducerOptional, transducerOptional, transducerOptional, transducer
Weight0.7 kg0.7 kg1.1 kg0.8 kg
DatasheetDatasheetDatasheetDatasheetDatasheet
SpecificationRain and wind onlyGMX240Rain, no windGMX400Rain with full weatherGMX550Most accurate rainfallGMX603
Choose it whenTemperature and pressure are measured elsewhereYou need rain with T/H/P and no windYou need rain alongside wind and core weatherRainfall accuracy matters more than anything
RainfallOptical, 0 to 300 mm/hrOptical, 0 to 300 mm/hrOptical or tipping bucketOptical, 0 to 200 mm/hr, 5% or better
Wind0 to 60 m/sNo0 to 60 m/s0 to 60 m/s
T/H/PNoYesYesYes
TruMet PW100NoNoPairs via tipping-bucket inputBuilt in
Weight0.5 kg0.5 kg0.7 kg1.1 kg
DatasheetDatasheetDatasheetDatasheetDatasheet
SpecificationSunlight onlyGMX301Sunlight and core weatherGMX501Sunlight, rain, full weatherGMX551
Choose it whenYou only need irradianceYou need irradiance with wind and T/H/PYou also need rainfall
Solar radiation0 to 1600 W/m², ISO 9060 Class C0 to 1600 W/m²0 to 1600 W/m²
WindNo0 to 60 m/s0 to 60 m/s
T/H/PNoYesYes
Weight0.6 kg0.8 kg0.8 kg
DatasheetDatasheetDatasheetDatasheet
SpecificationAir conditions onlyGMX300Air conditions and rainGMX400Room for wind laterMetConnect THP
Choose it whenYou need T/H/P and no windYou need T/H/P and rainfallYou want T/H/P now, with inputs for a separate wind sensor
RainfallNoOptical, 0 to 300 mm/hrVia rain gauge input
Sensors at different heightsNoNoYes
Weight0.5 kg0.5 kgSee datasheet
DatasheetDatasheetDatasheetDatasheet

Why MaxiMet

A broader environmental picture without a collection of separate instruments

MaxiMet brings multiple meteorological measurements into a single compact platform, allowing engineers to select the combination of parameters that the application actually requires.

That can reduce the physical footprint of the installation, simplify deployment and avoid building a weather station from multiple separate instruments with their own mounting arrangements, wiring and interfaces.

MaxiMet gave the Mayflower Autonomous Ship its weather data across the Atlantic with nobody aboard. Designed and manufactured in Lymington, Gill technology is specified in 150+ countries.

14configurationsone instrument platform
6measurementsin a single housing
0moving partsin the wind measurement
1cableand one output string
MaxiMet weather station installed on a lattice mast at a rural monitoring site
Remote monitoring mast

The technology

Integrated measurement, configured around the application

MaxiMet uses ultrasonic technology for wind measurement alongside solid-state sensing for the other meteorological parameters included in each configuration.

Configurations combine wind speed and direction, temperature, humidity, pressure, precipitation and solar radiation, with compass and GPS on selected models. The station also calculates derived parameters on board:

Dew pointWind chillAir densityTrue windSea-level pressureSolar positionWMO averages and gusts
Gill sensors mounted on a research mast above woodland
Gill sensors on a research mast

Low maintenance

Ultrasonic wind measurement removes a source of mechanical wear

Selected MaxiMet configurations use ultrasonic technology for wind measurement, so there are no rotating cups, bearings or mechanical vanes in the wind-sensing process. There are no wind-speed components to lubricate or replace as part of normal operation.

This matters most when the station is installed somewhere that is expensive, inconvenient or time-consuming to access. A remote monitoring site, offshore platform or autonomous vessel can turn a seemingly minor maintenance requirement into a significant operational task. Reducing it reduces the number of interventions over the life of the installation.

  • IP66 across the range, IP68 on the marine GMX260 and GMX560
  • Optional low-power transducer heating for cold sites
  • More than 40 years of Gill ultrasonic wind measurement

Power and integration

Designed to feed the systems that use the data. RS232, RS422, RS485, SDI-12 and Modbus, with USB through the MaxiMet communication cable, and Eco Mode for power-sensitive sites.

Download communications information →

Configuration and software

MetSet configures compatible Gill weather stations, including communications settings. MetView displays the data they collect. Both are available through Gill technical resources.

Download MetSet and MetView →

Environmental performance

Built for continuous measurement in exposed environments. IP66 across the range, IP68 on the marine models, and low-power heating for high-altitude, polar and other cold sites.

View technical specifications →

Technical specification

Choose the measurements. Then choose the configuration.

ConfigurationWind · T/H/P · Rain · SolarWeightDatasheet
GMX2000.5 kgDatasheet
GMX2400.5 kgDatasheet
GMX260 Marine0.5 kgDatasheet
GMX3000.5 kgDatasheet
GMX3010.6 kgDatasheet
GMX4000.5 kgDatasheet
GMX5000.7 kgDatasheet
GMX5010.8 kgDatasheet
GMX5500.7 kgDatasheet
GMX5510.8 kgDatasheet
GMX552 Heat Stress1.29 kgDatasheet
GMX560 Marine0.7 kgDatasheet
GMX6000.8 kgDatasheet
GMX6031.1 kgDatasheet
Wind, T/H/PRainfallSolar

Exact accuracy, power, dimensions, environmental limits, communications and model-specific options should remain tied to the relevant Gill datasheet as the technical source of record.

Accessories

MaxiMet accessories

Cables, mounts, set-up kit, add-on rain sensors and spares for the MaxiMet range. Pick a model to see only the parts that fit it.

In the box. Every MaxiMet ships with its mating connector (1405-PK-069).

Showing all 26 parts

Cables

  • Cable, 4 pair, cut to lengthPart no. 026-03156 Per metre
  • Cable, 4 pair, 15 m, pins fittedPart no. 1405-10-080 15 m
  • Retrofit cable, M12 to Clipper, 0.3 mPart no. 5150-PK-059Fits GMX603

Connectors

  • Spare connectorPart no. 1405-PK-069 One supplied

Mounting

  • Bracket for wall mounting or pole clampingPart no. 1771-PK-115
  • Support tube, 0.5 mPart no. 1405-30-056

Set-up and configuration

  • USB set-up cable, 1.8 mPart no. 1957-10-065 Power and comms over USB

Add-on rain sensors

  • TruMet PW100 optical rain gaugePart no. 5150-0100-000 No moving partsFits GMX550 and GMX551
  • TruMet PW100 integration cable, 20 mPart no. 5150-PK-039 20 mFits GMX550, GMX551 and GMX603
  • Optical rain sensorPart no. 1957-PK-073Fits GMX550 and GMX551
  • Optical rain sensor cable, 20 mPart no. 1957-10-064 20 mFits GMX550 and GMX551
  • Tipping bucket rain gaugePart no. 1957-PK-069Fits GMX550 and GMX551
  • Tipping bucket rain gauge cable, 20 mPart no. 1957-10-066 20 mFits GMX550 and GMX551
  • Tipping bucket input connector, 4 wayPart no. 020-06496Fits GMX550 and GMX551

Spares

  • Temperature and humidity sensor, serial numbers up to 2233xxxxPart no. 1957-PK-097Not for GMX200 or GMX240
  • Temperature and humidity sensor, serial numbers 2234xxxx onwardsPart no. 1957-PK-098Not for GMX200 or GMX240

Heat stress spares

  • Wet bulb sensor, 0.5 LPart no. 5437-PK-047Fits GMX552
  • Wet bulb sensor, 1 LPart no. 5437-PK-046Fits GMX552
  • Black globe, with locking screw and sealsPart no. 5437-PK-059Fits GMX552
  • Black globe temperature sensorPart no. 5437-PK-060Fits GMX552
  • Wet bulb PT100 temperature sensorPart no. 5437-PK-054Fits GMX552
  • Wet bulb sunshadePart no. 5437-PK-048Fits GMX552
  • Wet bulb bottle and retainer, 0.5 LPart no. 5437-PK-055Fits GMX552
  • Wet bulb bottle and retainer, 1 LPart no. 5437-PK-056Fits GMX552
  • Wick and O-ring, 0.5 L wet bulbPart no. 5437-PK-057 Pack of 5Fits GMX552
  • Wick and O-ring, 1 L wet bulbPart no. 5437-PK-058 Pack of 5Fits GMX552

Order accessories with your sensor or on their own. Quote the part number when you get in touch. See the accessories datasheet

Questions

Frequently asked questions

What is a weather station and what does it measure?

A weather station is a measurement system used to monitor atmospheric and environmental conditions at a particular location. Depending on the application, measurements can include wind speed and direction, temperature, relative humidity, atmospheric pressure, precipitation and solar radiation. The Gill MaxiMet range combines different combinations of these measurements within compact, integrated weather stations.

What sensors are typically used in a weather station?

A weather station can combine several sensing technologies depending on the parameters being measured. Wind speed and direction may be measured using ultrasonic or mechanical anemometers, while temperature, humidity, pressure, precipitation and solar radiation require different sensing technologies. Gill uses ultrasonic wind measurement alongside solid-state sensing across the MaxiMet range.

What measurements should a weather station have?

The appropriate measurements depend on what the system needs to understand or control. Wind speed and direction, temperature, humidity and pressure are common atmospheric measurements, while precipitation and solar radiation may be important for environmental monitoring, agriculture, renewable energy and research. The Gill MaxiMet range provides different combinations so the station can be specified around the application rather than simply selecting every available measurement.

What is the difference between a weather station and an anemometer?

An anemometer measures wind, typically providing wind speed and direction. A weather station combines wind measurement with other meteorological parameters such as temperature, humidity, pressure, precipitation or solar radiation. Gill manufactures both ultrasonic anemometers and integrated MaxiMet weather stations, allowing the measurement system to be selected according to the application.

What is the best weather station for environmental monitoring?

There is no single weather station that is best for every environmental monitoring application. The appropriate system depends on the parameters being measured, required accuracy, environmental conditions, power availability, communications and installation requirements. The Gill MaxiMet range is suited to applications where several meteorological measurements need to be collected from the same location within one compact platform.

What is the best weather station for remote monitoring?

The right weather station for remote monitoring depends on the measurements required, available power, communications, environmental exposure and how easily the site can be accessed. Low maintenance and efficient power consumption can become particularly important when routine visits are difficult. The Gill MaxiMet range provides compact configurations with low-power operation and ultrasonic wind measurement for applications where reducing maintenance is valuable.

What is the best weather station for marine applications?

Marine weather stations need to account for salt exposure, moisture, wind, movement and, depending on the application, heading and positioning. Environmental protection is therefore as important as the measurement capability. Gill MaxiMet Marine configurations are designed for marine deployment, with selected models providing enhanced environmental protection, compass functionality, GPS and heating options.

What is the advantage of an ultrasonic weather station?

An ultrasonic weather station uses ultrasonic measurement rather than rotating mechanical components to determine wind speed and direction. This removes cups, mechanical vanes and bearings from the wind-sensing process, reducing mechanical wear and the associated maintenance requirements. Gill has more than 40 years of experience in ultrasonic wind measurement and uses the technology across its wind sensors and MaxiMet weather stations.

Can MaxiMet calculate dew point and other derived meteorological parameters?

Yes. Depending on configuration, Gill MaxiMet can provide derived parameters including dew point, wind chill, air density, true wind, pressure at sea level, solar position and WMO wind averages and gusts. This allows the station to provide not only individual environmental measurements but also calculated information derived from them.

Have an application to discuss?

Speak to our team

Tell us what you need to measure, where and under what conditions. We’ll help you work out the appropriate approach.

Enquiring about MaxiMet

  • You tell us the application What you measure, where and in what conditions.
  • A real person reads it Not an account manager, and not a queue.
  • We aim to respond in one working day Monday to Friday.