Gill Instruments Ltd
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MaxiMet
Page 7
Issue 1
Doc. No. 1957-PS-000x
March 2015
Radiation Shield (GMX200 and GMX600)
A MetSpec Multi-Plate Radiation Shield is used. The special shield plate geometry, with its double
louvre design, provides excellent response time performance of quick ambient temperature
changes while still working effectively as a baffle to stop larger contaminants such as salt or dirt
from reaching the temperature and humidity. The shield benefits from very robust material choice
and extremely high UV protection requiring no maintenance.
Temperature and Relative Humidity Sensor with Dewpoint Calculation (GMX600)
There is an internal solid state instrument contained within the Radiation shield that provides
digital output signals for Relative Humidity, Temperature and calculated Dewpoint.
Barometric Pressure (GMX600)
Barometric pressure output is provided by a solid-state device fitted on to a circuit board inside a
MaxiMet moulding.
Rain (GMX600)
A reading of Rain levels is provided by using an optical infra-red beam sensor. Infra-Red beams
that bounce off the inner optical surface between transmitters and receivers. Depending on rain
drop levels the intensity of the beams change and internal digital signal processing allows a
measurement of Rain levels to be made.
Compass (GMX200 and GMX600)
MaxiMet contains a 2-axis compass and magnetic field sensing module using Magneto-Inductive
(MI) sensors. The sensor changes inductance by 100% over its field measurement range. It
incorporates a temperature and noise stabilized oscillator/counter circuit. The compass has a high
degree of azimuth accuracy.
MaxiMet uses the internal; compass to electronically sense the difference in the earth's field from
the system's magnetic field, then an on-board microprocessor electronically subtracts out the
system's magnetic fields, reporting highly accurate compass readings. Wind direction data is
corrected for the orientation of the sensor. The output of the wind direction is relative to magnetic
North.
