MaxiMet GMX531




Temperature, humidity, pressure

A combined instrument mounted inside three double louvered, naturally aspirated radiation shields with no moving parts.

The results are high performance across each measurement over long periods of time.

Solar Radiation

An integrated solar radiation sensor/pyranometer. This highly accurate instrument uses a thermal sensor mounted as its base and protected by a single glass dome to record the amount of light in watts per square metre.

It is widely used in agro-meteorological applications and for monitoring the performance of solar panels.


Wind speed and direction measurements are provided via an ultrasonic sensor and the addition of an electronic compass provides apparent wind measurements.

Average speed and direction together with WMO averages and gust data is also provided. Add GPS (optional) to provide true wind and other features.


The Kalyx tipping bucket rain gauge supplied provides excellent performance in tropical or heavy convective precipitation locations.

The low power Kalyx connects via a 20m cable (included).



MaxiMet GMX531

The MaxiMet range of compact weather stations is designed and manufactured by Gill Instruments. MaxiMet products use reliable, high-quality instruments to provide accurate meteorological information in a wide variety of applications.


Technical specs

Temp, Humidity & Pressure:

  • Air Pressure / Temperature
  • Relative / Absolute humidity
  • Naturally aspirated UV stable
    radiation shield
  • Protection against wind-blown

Solar Radiation:

  • Complies with ISO 9060 and WMO Guidelinesƒ
  • Output in watts per metre2ƒ
  • 180° hemispherical field of viewƒ
  • Records sunshine hoursƒ
  • Integrated Hukseflux LP02 pyranometer
  • Glass dome


  • Wind speed & directionƒ
  • Apparent and true wind (with GPS)ƒ
  • WMO wind averages and gust
  • Compass

Precipitation (INPUT):

  • 0.2 mm tip Kaylx rain gauge
  • 20m Cable
  • Solar radiation W/m²
  • Sunshine hours hrs
  • Solar Noon
  • Temperature °C/°F/°K
  • Relative humidity % Rh, g/m3
  • Barometric pressure hPa, mbar, mm, Hg, In Hg
  • Wet bulb temperature °C/°F/°K
  • Absolute humidity g/m³
  • Air density kg/m³
  • Precipitation mm/hr, mm/total, in/hr, in/total
  • Wind speed m/s, km/hr, mph, kts, ft/min
  • Wind direction °
  • Wind chill °C/°F/°K
  • True/apparent wind
  • Angle of Tilt
  • Outputs (RS232, 422, 485 (ASCII), SDI-12, NMEA, MODBUS, Analogue (option)
  • Height above sea level m
  • MSL pressure
  • Sunrise/sunset
  • The position of the sun
  • Twilight
  • Solar Noon
  • Quality Measurements
  • Lightweight and Robust
  • Low Power Mode
  • Free of Charge Software
  • Gill Proven Reliability
  • Compact Integrated Design
  • Real-Time Output
  • Easy Installation
  • Gill Customer Support
  • 2 Year Warranty
  • Building and Industrial Controls
  • Authorities
  • Transport
  • Coastal
  • Agricultural
  • Safety
  • Educational
  • Commercial
  • Energy

Kalyx Rain Gauge

The Kalyx tipping bucket rain gauge provides excellent performance in tropical or heavy convective precipitation locations. The low power Kalyx connects via a 20m cable (included) that the user can cut to length.

The sensor has a tipping bucket mechanism which automatically tips when precipitation accumulates inside of it. Total precipitation is determined by the number of tips.

An adjustable mounting plate compensates for uneven surfaces and the unique aerodynamic shape of the rain gauge reduces the effect of wind blown rain being carried away from the collecting vessel.

The tipping bucket includes a drain hole and does not need to be emptied.

Measurement type:

  • TBRG (Kalyx)


  • 0-1000 mm/hr

Precipitation Resolution:

  • 0.2 mm


  • 2%
Sampling Rate:
  • 1 Hz
  • mm/hr, mm/total, mm/24 hr, in/hr, in/total, in/24 hr
  • N/A
  • Contact closure via 20m cable to GMX
  • Adjustable mounting plate


Download MaxiMet GMX531 Spec
Download Maximet Manual


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