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+44 (0) 1590 641223 Unit 1 | Barnes ln | Milford on Sea | SO41 0AP MON-FRI 9-5

Gill MaxiMet GMX240

£1,472.00 exVAT

£1,766.40 incVAT

We have a selection of pre-made RS232 and RS485 cables available to accompany this sensor.

Extremely accurate solid state ultrasonic rainfall, wind speed and direction sensor with built in electronic compass that automatically aligns the sensor to north. Optional GPS functionality delivers true wind measurements and automatically positions the sensor.

SKU: WS-GILL-GMX240-1957-0240-60-00 Categories:, Tags:,

Product Description

The Gill MaxiMet GMX2400 is an extremely compact, robust and lightweight solution for accurately measuring rainfall, wind speed and wind direction.

The integrated optical rain gauge senses rainfall as it hits its surface automatically measuring the raindrops size and quantity. It then records the data from which it calculates and formats the output as if a traditional tipping bucket rain gauge in serial format. The result is an extremely accurate precipitation sensor that has no moving parts and requires virtually no maintenance.

Wind speed and direction are measured using a solid state ultrasonic sensor. An electronic compass comes as standard, calculating apparent wind, WMO wind averages and gust data. The optional GPS adds the benefit of a true wind measurement, height above sea level, latitude and longitude and simplifies installation by automatically locating the sensor position.

NOTE: This optical sensor provides a general Indication only of rainfall levels for use in situations where low maintenance is required. Use a tipping bucket gauge (ARG314 or Kalyx) or equivalent with a GMX MaxiMet sensor (e.g. GMX531, GMX550 and GMX551) where reference quality precipitation measurements are required.

Richard Paul Russell Ltd. can connect the sensor to the website where data can be viewed using any internet connected device and downloaded for detailed analysis in a .CSV file


• Building and industrial controls
• Authorities
• Transport
• Coastal
• Agricultural
• Safety
• Educational
• Commercial
• Energy

Additional information


Wind speed & direction, Temperature, humidity & pressure, Precipitation, GPS (opt)

GPS option

Yes, No


• Wind sensor
• Wind speed & direction
• Apparent wind
• WMO wind averages, gusts
• Built in compass
• GPS *Optional provides true wind, latitude, longitude and height above sea level
• Precipitation sensor
• Optical rain gauge
• No moving parts unlike tipping bucket rain gauges
• Lightweight and compact
• Robust construction
• Low power consumption
• No moving parts
• Extremely low maintenance
• 24 months warranty

Wind Wind speed & direction
Apparent and true wind (with GPS)
WMO wind averages and gust
GPS (optional) gives height above sea level, latitude and longitude
GPS (Option) Height above sea level m
Position of the sun
Solar Noon
MSL pressure
Precipitation Rainfall total
Rainfall intensity
Rainfall Y/N
Emulated tipping bucket
Integrated heater
No moving parts
0.08 mm tip Optical Rain Gauge (customer select)
Parameters Wind speed m/s, hm/hr, mph, kts, ft/min
Wind direction °
True/apparent wind
Angle of Tilt
Precipitation mm/hr, mm/total, in/hr, in/total
Outputs RS232, 422, 485 (ASCII), SDI-12, NMEA, MODBUS, Analogue (option)
Wind Speed Range 0.01 m/s to 60 m/s
Accuracy ± 3% to 40 m/s,
± 5% to 60 m/s
Resolution m/s 0.01
Starting Speed 0.01 m/s
Sampling Rate 1 Hz
Units m/s, km/hr, mph, kts, ft/min
Wind Direction Range 0-359°
Accuracy ± 3% to 40 m/s,
± 5% to 60 m/s
Starting Threshold 0.05 m/s
Sampling Rate 1 Hz
Units Degrees
Precipitation Measurement type Optical
Range 0 to < 300 mm/hr
Precipitation Resolution 0.008 mm (Scaleable 0.001 to 10.000)
Repeatability 3%
Sampling Rate 1 Hz
Units mm/hr, mm/total, in/hr, in/total
Heating Yes
Outputs Output rate 1/s, 1/min, 1/hr
Digital Comms Modes Serial RS232, RS422, RS485, SDI-12, NMEA, MODBUS, ASCII
Analogue Outputs Available via seperate optional device
Power Power Supply 5 to 30 Vdc
Power (Nominal) 12 Vdc 64 mA continuous high mode. 0.7 mA eco-power mode (1 hour polled)
Environmental Conditions IP Rating 66
Operational Temperature Range -40°C to +70°C
EMC Standard BS EN 61326-2-1:2013 FCC, CFR Title 47, Part 15, Subpart B, Class A digital device
CE Marking Yes
RoHS compilant Yes
Weight 0.5 Kg
Origin UK
Download PDF WeatherFile System Flyer
User Manual
Download PDF MaxiMet User Manual – Issue 9
Download PDF Application Note
Data Sheet
Download PDF MaxiMet GMX 100
Download PDF MaxiMet GMX 200
Download PDF MaxiMet GMX 300
Download PDF MaxiMet GMX 301
Download PDF MaxiMet GMX 400
Download PDF MaxiMet GMX 500
Download PDF MaxiMet GMX 501
Download PDF MaxiMet GMX 550
Download PDF MaxiMet GMX 551
Download PDF MaxiMet GMX 600

Choose your sensor based on the parameters you want to measure.

GMX 200
GMX 240
GMX 300
GMX 301
GMX 400
GMX 500
GMX 501
GMX 550
GMX 551
GMX 600
GMX200 GMX240 GMX300 GMX301 GMX400 GMX500 GMX501 GMX550 GMX551 GMX600
Wind Speed Tick Tick Tick Tick Tick Tick Tick
Wind Direction Tick Tick Tick Tick Tick Tick Tick
Air Temperature Tick Tick Tick Tick Tick Tick Tick Tick
Humidity Tick Tick Tick Tick Tick Tick Tick Tick
Pressure Tick Tick Tick Tick Tick Tick Tick
Dew Point Tick Tick Tick Tick Tick Tick Tick Tick
Wet Bulb Temperature Tick Tick Tick Tick Tick Tick Tick Tick
Precipitation (Optical Rain Gauge) Tick Tick Tick
Precipitation (Tipping Rain Bucket Gauge)
Solar Radiation Tick Tick Tick
Compass Tick Tick Tick Tick Tick Tick
Optional GPS Positioning Tick Tick Tick Tick Tick Tick
Side Connector for Rain Gauge Tick Tick

If you want to discuss a bespoke system specification or have any questions call
our technical team on +44 (0) 1590 641223 or email

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